diff --git a/SConstruct b/SConstruct index a66290aabf..14450cec9f 100644 --- a/SConstruct +++ b/SConstruct @@ -90,7 +90,6 @@ if arch == "aarch64" or arch == "larch64": "/usr/lib", "/system/vendor/lib64", "/system/comma/usr/lib", - "#third_party/nanovg", f"#third_party/acados/{arch}/lib", ] @@ -209,7 +208,6 @@ env = Environment( "#third_party/linux/include", "#third_party/snpe/include", "#third_party/mapbox-gl-native-qt/include", - "#third_party/nanovg", "#third_party/qrcode", "#third_party", "#cereal", diff --git a/release/files_common b/release/files_common index 902242bcd7..3fc354396a 100644 --- a/release/files_common +++ b/release/files_common @@ -443,9 +443,6 @@ selfdrive/assets/training/* third_party/SConscript -third_party/nanovg/*.c -third_party/nanovg/*.h - third_party/libgralloc/** third_party/linux/** third_party/opencl/** diff --git a/third_party/nanovg/fontstash.h b/third_party/nanovg/fontstash.h deleted file mode 100644 index 35dfb0f652..0000000000 --- a/third_party/nanovg/fontstash.h +++ /dev/null @@ -1,1718 +0,0 @@ -// -// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org -// -// This software is provided 'as-is', without any express or implied -// warranty. In no event will the authors be held liable for any damages -// arising from the use of this software. -// Permission is granted to anyone to use this software for any purpose, -// including commercial applications, and to alter it and redistribute it -// freely, subject to the following restrictions: -// 1. The origin of this software must not be misrepresented; you must not -// claim that you wrote the original software. If you use this software -// in a product, an acknowledgment in the product documentation would be -// appreciated but is not required. -// 2. Altered source versions must be plainly marked as such, and must not be -// misrepresented as being the original software. -// 3. This notice may not be removed or altered from any source distribution. -// - -#ifndef FONS_H -#define FONS_H - -#define FONS_INVALID -1 - -enum FONSflags { - FONS_ZERO_TOPLEFT = 1, - FONS_ZERO_BOTTOMLEFT = 2, -}; - -enum FONSalign { - // Horizontal align - FONS_ALIGN_LEFT = 1<<0, // Default - FONS_ALIGN_CENTER = 1<<1, - FONS_ALIGN_RIGHT = 1<<2, - // Vertical align - FONS_ALIGN_TOP = 1<<3, - FONS_ALIGN_MIDDLE = 1<<4, - FONS_ALIGN_BOTTOM = 1<<5, - FONS_ALIGN_BASELINE = 1<<6, // Default -}; - -enum FONSerrorCode { - // Font atlas is full. - FONS_ATLAS_FULL = 1, - // Scratch memory used to render glyphs is full, requested size reported in 'val', you may need to bump up FONS_SCRATCH_BUF_SIZE. - FONS_SCRATCH_FULL = 2, - // Calls to fonsPushState has created too large stack, if you need deep state stack bump up FONS_MAX_STATES. - FONS_STATES_OVERFLOW = 3, - // Trying to pop too many states fonsPopState(). - FONS_STATES_UNDERFLOW = 4, -}; - -struct FONSparams { - int width, height; - unsigned char flags; - void* userPtr; - int (*renderCreate)(void* uptr, int width, int height); - int (*renderResize)(void* uptr, int width, int height); - void (*renderUpdate)(void* uptr, int* rect, const unsigned char* data); - void (*renderDraw)(void* uptr, const float* verts, const float* tcoords, const unsigned int* colors, int nverts); - void (*renderDelete)(void* uptr); -}; -typedef struct FONSparams FONSparams; - -struct FONSquad -{ - float x0,y0,s0,t0; - float x1,y1,s1,t1; -}; -typedef struct FONSquad FONSquad; - -struct FONStextIter { - float x, y, nextx, nexty, scale, spacing; - unsigned int codepoint; - short isize, iblur; - struct FONSfont* font; - int prevGlyphIndex; - const char* str; - const char* next; - const char* end; - unsigned int utf8state; -}; -typedef struct FONStextIter FONStextIter; - -typedef struct FONScontext FONScontext; - -// Constructor and destructor. -FONScontext* fonsCreateInternal(FONSparams* params); -void fonsDeleteInternal(FONScontext* s); - -void fonsSetErrorCallback(FONScontext* s, void (*callback)(void* uptr, int error, int val), void* uptr); -// Returns current atlas size. -void fonsGetAtlasSize(FONScontext* s, int* width, int* height); -// Expands the atlas size. -int fonsExpandAtlas(FONScontext* s, int width, int height); -// Resets the whole stash. -int fonsResetAtlas(FONScontext* stash, int width, int height); - -// Add fonts -int fonsAddFont(FONScontext* s, const char* name, const char* path); -int fonsAddFontMem(FONScontext* s, const char* name, unsigned char* data, int ndata, int freeData); -int fonsGetFontByName(FONScontext* s, const char* name); - -// State handling -void fonsPushState(FONScontext* s); -void fonsPopState(FONScontext* s); -void fonsClearState(FONScontext* s); - -// State setting -void fonsSetSize(FONScontext* s, float size); -void fonsSetColor(FONScontext* s, unsigned int color); -void fonsSetSpacing(FONScontext* s, float spacing); -void fonsSetBlur(FONScontext* s, float blur); -void fonsSetAlign(FONScontext* s, int align); -void fonsSetFont(FONScontext* s, int font); - -// Draw text -float fonsDrawText(FONScontext* s, float x, float y, const char* string, const char* end); - -// Measure text -float fonsTextBounds(FONScontext* s, float x, float y, const char* string, const char* end, float* bounds); -void fonsLineBounds(FONScontext* s, float y, float* miny, float* maxy); -void fonsVertMetrics(FONScontext* s, float* ascender, float* descender, float* lineh); - -// Text iterator -int fonsTextIterInit(FONScontext* stash, FONStextIter* iter, float x, float y, const char* str, const char* end); -int fonsTextIterNext(FONScontext* stash, FONStextIter* iter, struct FONSquad* quad); - -// Pull texture changes -const unsigned char* fonsGetTextureData(FONScontext* stash, int* width, int* height); -int fonsValidateTexture(FONScontext* s, int* dirty); - -// Draws the stash texture for debugging -void fonsDrawDebug(FONScontext* s, float x, float y); - -#endif // FONTSTASH_H - - -#ifdef FONTSTASH_IMPLEMENTATION - -#define FONS_NOTUSED(v) (void)sizeof(v) - -#ifdef FONS_USE_FREETYPE - -#include -#include FT_FREETYPE_H -#include FT_ADVANCES_H -#include - -struct FONSttFontImpl { - FT_Face font; -}; -typedef struct FONSttFontImpl FONSttFontImpl; - -static FT_Library ftLibrary; - -int fons__tt_init(FONScontext *context) -{ - FT_Error ftError; - FONS_NOTUSED(context); - ftError = FT_Init_FreeType(&ftLibrary); - return ftError == 0; -} - -int fons__tt_loadFont(FONScontext *context, FONSttFontImpl *font, unsigned char *data, int dataSize) -{ - FT_Error ftError; - FONS_NOTUSED(context); - - //font->font.userdata = stash; - ftError = FT_New_Memory_Face(ftLibrary, (const FT_Byte*)data, dataSize, 0, &font->font); - return ftError == 0; -} - -void fons__tt_getFontVMetrics(FONSttFontImpl *font, int *ascent, int *descent, int *lineGap) -{ - *ascent = font->font->ascender; - *descent = font->font->descender; - *lineGap = font->font->height - (*ascent - *descent); -} - -float fons__tt_getPixelHeightScale(FONSttFontImpl *font, float size) -{ - return size / (font->font->ascender - font->font->descender); -} - -int fons__tt_getGlyphIndex(FONSttFontImpl *font, int codepoint) -{ - return FT_Get_Char_Index(font->font, codepoint); -} - -int fons__tt_buildGlyphBitmap(FONSttFontImpl *font, int glyph, float size, float scale, - int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1) -{ - FT_Error ftError; - FT_GlyphSlot ftGlyph; - FT_Fixed advFixed; - FONS_NOTUSED(scale); - - ftError = FT_Set_Pixel_Sizes(font->font, 0, (FT_UInt)(size * (float)font->font->units_per_EM / (float)(font->font->ascender - font->font->descender))); - if (ftError) return 0; - ftError = FT_Load_Glyph(font->font, glyph, FT_LOAD_RENDER); - if (ftError) return 0; - ftError = FT_Get_Advance(font->font, glyph, FT_LOAD_NO_SCALE, &advFixed); - if (ftError) return 0; - ftGlyph = font->font->glyph; - *advance = (int)advFixed; - *lsb = (int)ftGlyph->metrics.horiBearingX; - *x0 = ftGlyph->bitmap_left; - *x1 = *x0 + ftGlyph->bitmap.width; - *y0 = -ftGlyph->bitmap_top; - *y1 = *y0 + ftGlyph->bitmap.rows; - return 1; -} - -void fons__tt_renderGlyphBitmap(FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride, - float scaleX, float scaleY, int glyph) -{ - FT_GlyphSlot ftGlyph = font->font->glyph; - int ftGlyphOffset = 0; - int x, y; - FONS_NOTUSED(outWidth); - FONS_NOTUSED(outHeight); - FONS_NOTUSED(scaleX); - FONS_NOTUSED(scaleY); - FONS_NOTUSED(glyph); // glyph has already been loaded by fons__tt_buildGlyphBitmap - - for ( y = 0; y < ftGlyph->bitmap.rows; y++ ) { - for ( x = 0; x < ftGlyph->bitmap.width; x++ ) { - output[(y * outStride) + x] = ftGlyph->bitmap.buffer[ftGlyphOffset++]; - } - } -} - -int fons__tt_getGlyphKernAdvance(FONSttFontImpl *font, int glyph1, int glyph2) -{ - FT_Vector ftKerning; - FT_Get_Kerning(font->font, glyph1, glyph2, FT_KERNING_DEFAULT, &ftKerning); - return (int)((ftKerning.x + 32) >> 6); // Round up and convert to integer -} - -#else - -#define STB_TRUETYPE_IMPLEMENTATION -static void* fons__tmpalloc(size_t size, void* up); -static void fons__tmpfree(void* ptr, void* up); -#define STBTT_malloc(x,u) fons__tmpalloc(x,u) -#define STBTT_free(x,u) fons__tmpfree(x,u) -#include "stb_truetype.h" - -struct FONSttFontImpl { - stbtt_fontinfo font; -}; -typedef struct FONSttFontImpl FONSttFontImpl; - -int fons__tt_init(FONScontext *context) -{ - FONS_NOTUSED(context); - return 1; -} - -int fons__tt_loadFont(FONScontext *context, FONSttFontImpl *font, unsigned char *data, int dataSize) -{ - int stbError; - FONS_NOTUSED(dataSize); - - font->font.userdata = context; - stbError = stbtt_InitFont(&font->font, data, 0); - return stbError; -} - -void fons__tt_getFontVMetrics(FONSttFontImpl *font, int *ascent, int *descent, int *lineGap) -{ - stbtt_GetFontVMetrics(&font->font, ascent, descent, lineGap); -} - -float fons__tt_getPixelHeightScale(FONSttFontImpl *font, float size) -{ - return stbtt_ScaleForPixelHeight(&font->font, size); -} - -int fons__tt_getGlyphIndex(FONSttFontImpl *font, int codepoint) -{ - return stbtt_FindGlyphIndex(&font->font, codepoint); -} - -int fons__tt_buildGlyphBitmap(FONSttFontImpl *font, int glyph, float size, float scale, - int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1) -{ - FONS_NOTUSED(size); - stbtt_GetGlyphHMetrics(&font->font, glyph, advance, lsb); - stbtt_GetGlyphBitmapBox(&font->font, glyph, scale, scale, x0, y0, x1, y1); - return 1; -} - -void fons__tt_renderGlyphBitmap(FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride, - float scaleX, float scaleY, int glyph) -{ - stbtt_MakeGlyphBitmap(&font->font, output, outWidth, outHeight, outStride, scaleX, scaleY, glyph); -} - -int fons__tt_getGlyphKernAdvance(FONSttFontImpl *font, int glyph1, int glyph2) -{ - return stbtt_GetGlyphKernAdvance(&font->font, glyph1, glyph2); -} - -#endif - -#ifndef FONS_SCRATCH_BUF_SIZE -# define FONS_SCRATCH_BUF_SIZE 64000 -#endif -#ifndef FONS_HASH_LUT_SIZE -# define FONS_HASH_LUT_SIZE 256 -#endif -#ifndef FONS_INIT_FONTS -# define FONS_INIT_FONTS 4 -#endif -#ifndef FONS_INIT_GLYPHS -# define FONS_INIT_GLYPHS 256 -#endif -#ifndef FONS_INIT_ATLAS_NODES -# define FONS_INIT_ATLAS_NODES 256 -#endif -#ifndef FONS_VERTEX_COUNT -# define FONS_VERTEX_COUNT 1024 -#endif -#ifndef FONS_MAX_STATES -# define FONS_MAX_STATES 20 -#endif -#ifndef FONS_MAX_FALLBACKS -# define FONS_MAX_FALLBACKS 20 -#endif - -static unsigned int fons__hashint(unsigned int a) -{ - a += ~(a<<15); - a ^= (a>>10); - a += (a<<3); - a ^= (a>>6); - a += ~(a<<11); - a ^= (a>>16); - return a; -} - -static int fons__mini(int a, int b) -{ - return a < b ? a : b; -} - -static int fons__maxi(int a, int b) -{ - return a > b ? a : b; -} - -struct FONSglyph -{ - unsigned int codepoint; - int index; - int next; - short size, blur; - short x0,y0,x1,y1; - short xadv,xoff,yoff; -}; -typedef struct FONSglyph FONSglyph; - -struct FONSfont -{ - FONSttFontImpl font; - char name[64]; - unsigned char* data; - int dataSize; - unsigned char freeData; - float ascender; - float descender; - float lineh; - FONSglyph* glyphs; - int cglyphs; - int nglyphs; - int lut[FONS_HASH_LUT_SIZE]; - int fallbacks[FONS_MAX_FALLBACKS]; - int nfallbacks; -}; -typedef struct FONSfont FONSfont; - -struct FONSstate -{ - int font; - int align; - float size; - unsigned int color; - float blur; - float spacing; -}; -typedef struct FONSstate FONSstate; - -struct FONSatlasNode { - short x, y, width; -}; -typedef struct FONSatlasNode FONSatlasNode; - -struct FONSatlas -{ - int width, height; - FONSatlasNode* nodes; - int nnodes; - int cnodes; -}; -typedef struct FONSatlas FONSatlas; - -struct FONScontext -{ - FONSparams params; - float itw,ith; - unsigned char* texData; - int dirtyRect[4]; - FONSfont** fonts; - FONSatlas* atlas; - int cfonts; - int nfonts; - float verts[FONS_VERTEX_COUNT*2]; - float tcoords[FONS_VERTEX_COUNT*2]; - unsigned int colors[FONS_VERTEX_COUNT]; - int nverts; - unsigned char* scratch; - int nscratch; - FONSstate states[FONS_MAX_STATES]; - int nstates; - void (*handleError)(void* uptr, int error, int val); - void* errorUptr; -}; - -#ifdef STB_TRUETYPE_IMPLEMENTATION - -static void* fons__tmpalloc(size_t size, void* up) -{ - unsigned char* ptr; - FONScontext* stash = (FONScontext*)up; - - // 16-byte align the returned pointer - size = (size + 0xf) & ~0xf; - - if (stash->nscratch+(int)size > FONS_SCRATCH_BUF_SIZE) { - if (stash->handleError) - stash->handleError(stash->errorUptr, FONS_SCRATCH_FULL, stash->nscratch+(int)size); - return NULL; - } - ptr = stash->scratch + stash->nscratch; - stash->nscratch += (int)size; - return ptr; -} - -static void fons__tmpfree(void* ptr, void* up) -{ - (void)ptr; - (void)up; - // empty -} - -#endif // STB_TRUETYPE_IMPLEMENTATION - -// Copyright (c) 2008-2010 Bjoern Hoehrmann -// See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details. - -#define FONS_UTF8_ACCEPT 0 -#define FONS_UTF8_REJECT 12 - -static unsigned int fons__decutf8(unsigned int* state, unsigned int* codep, unsigned int byte) -{ - static const unsigned char utf8d[] = { - // The first part of the table maps bytes to character classes that - // to reduce the size of the transition table and create bitmasks. - 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, - 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, - 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, - 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, - 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, - 10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8, - - // The second part is a transition table that maps a combination - // of a state of the automaton and a character class to a state. - 0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12, - 12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12, - 12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12, - 12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12, - 12,36,12,12,12,12,12,12,12,12,12,12, - }; - - unsigned int type = utf8d[byte]; - - *codep = (*state != FONS_UTF8_ACCEPT) ? - (byte & 0x3fu) | (*codep << 6) : - (0xff >> type) & (byte); - - *state = utf8d[256 + *state + type]; - return *state; -} - -// Atlas based on Skyline Bin Packer by Jukka Jylänki - -static void fons__deleteAtlas(FONSatlas* atlas) -{ - if (atlas == NULL) return; - if (atlas->nodes != NULL) free(atlas->nodes); - free(atlas); -} - -static FONSatlas* fons__allocAtlas(int w, int h, int nnodes) -{ - FONSatlas* atlas = NULL; - - // Allocate memory for the font stash. - atlas = (FONSatlas*)malloc(sizeof(FONSatlas)); - if (atlas == NULL) goto error; - memset(atlas, 0, sizeof(FONSatlas)); - - atlas->width = w; - atlas->height = h; - - // Allocate space for skyline nodes - atlas->nodes = (FONSatlasNode*)malloc(sizeof(FONSatlasNode) * nnodes); - if (atlas->nodes == NULL) goto error; - memset(atlas->nodes, 0, sizeof(FONSatlasNode) * nnodes); - atlas->nnodes = 0; - atlas->cnodes = nnodes; - - // Init root node. - atlas->nodes[0].x = 0; - atlas->nodes[0].y = 0; - atlas->nodes[0].width = (short)w; - atlas->nnodes++; - - return atlas; - -error: - if (atlas) fons__deleteAtlas(atlas); - return NULL; -} - -static int fons__atlasInsertNode(FONSatlas* atlas, int idx, int x, int y, int w) -{ - int i; - // Insert node - if (atlas->nnodes+1 > atlas->cnodes) { - atlas->cnodes = atlas->cnodes == 0 ? 8 : atlas->cnodes * 2; - atlas->nodes = (FONSatlasNode*)realloc(atlas->nodes, sizeof(FONSatlasNode) * atlas->cnodes); - if (atlas->nodes == NULL) - return 0; - } - for (i = atlas->nnodes; i > idx; i--) - atlas->nodes[i] = atlas->nodes[i-1]; - atlas->nodes[idx].x = (short)x; - atlas->nodes[idx].y = (short)y; - atlas->nodes[idx].width = (short)w; - atlas->nnodes++; - - return 1; -} - -static void fons__atlasRemoveNode(FONSatlas* atlas, int idx) -{ - int i; - if (atlas->nnodes == 0) return; - for (i = idx; i < atlas->nnodes-1; i++) - atlas->nodes[i] = atlas->nodes[i+1]; - atlas->nnodes--; -} - -static void fons__atlasExpand(FONSatlas* atlas, int w, int h) -{ - // Insert node for empty space - if (w > atlas->width) - fons__atlasInsertNode(atlas, atlas->nnodes, atlas->width, 0, w - atlas->width); - atlas->width = w; - atlas->height = h; -} - -static void fons__atlasReset(FONSatlas* atlas, int w, int h) -{ - atlas->width = w; - atlas->height = h; - atlas->nnodes = 0; - - // Init root node. - atlas->nodes[0].x = 0; - atlas->nodes[0].y = 0; - atlas->nodes[0].width = (short)w; - atlas->nnodes++; -} - -static int fons__atlasAddSkylineLevel(FONSatlas* atlas, int idx, int x, int y, int w, int h) -{ - int i; - - // Insert new node - if (fons__atlasInsertNode(atlas, idx, x, y+h, w) == 0) - return 0; - - // Delete skyline segments that fall under the shadow of the new segment. - for (i = idx+1; i < atlas->nnodes; i++) { - if (atlas->nodes[i].x < atlas->nodes[i-1].x + atlas->nodes[i-1].width) { - int shrink = atlas->nodes[i-1].x + atlas->nodes[i-1].width - atlas->nodes[i].x; - atlas->nodes[i].x += (short)shrink; - atlas->nodes[i].width -= (short)shrink; - if (atlas->nodes[i].width <= 0) { - fons__atlasRemoveNode(atlas, i); - i--; - } else { - break; - } - } else { - break; - } - } - - // Merge same height skyline segments that are next to each other. - for (i = 0; i < atlas->nnodes-1; i++) { - if (atlas->nodes[i].y == atlas->nodes[i+1].y) { - atlas->nodes[i].width += atlas->nodes[i+1].width; - fons__atlasRemoveNode(atlas, i+1); - i--; - } - } - - return 1; -} - -static int fons__atlasRectFits(FONSatlas* atlas, int i, int w, int h) -{ - // Checks if there is enough space at the location of skyline span 'i', - // and return the max height of all skyline spans under that at that location, - // (think tetris block being dropped at that position). Or -1 if no space found. - int x = atlas->nodes[i].x; - int y = atlas->nodes[i].y; - int spaceLeft; - if (x + w > atlas->width) - return -1; - spaceLeft = w; - while (spaceLeft > 0) { - if (i == atlas->nnodes) return -1; - y = fons__maxi(y, atlas->nodes[i].y); - if (y + h > atlas->height) return -1; - spaceLeft -= atlas->nodes[i].width; - ++i; - } - return y; -} - -static int fons__atlasAddRect(FONSatlas* atlas, int rw, int rh, int* rx, int* ry) -{ - int besth = atlas->height, bestw = atlas->width, besti = -1; - int bestx = -1, besty = -1, i; - - // Bottom left fit heuristic. - for (i = 0; i < atlas->nnodes; i++) { - int y = fons__atlasRectFits(atlas, i, rw, rh); - if (y != -1) { - if (y + rh < besth || (y + rh == besth && atlas->nodes[i].width < bestw)) { - besti = i; - bestw = atlas->nodes[i].width; - besth = y + rh; - bestx = atlas->nodes[i].x; - besty = y; - } - } - } - - if (besti == -1) - return 0; - - // Perform the actual packing. - if (fons__atlasAddSkylineLevel(atlas, besti, bestx, besty, rw, rh) == 0) - return 0; - - *rx = bestx; - *ry = besty; - - return 1; -} - -static void fons__addWhiteRect(FONScontext* stash, int w, int h) -{ - int x, y, gx, gy; - unsigned char* dst; - if (fons__atlasAddRect(stash->atlas, w, h, &gx, &gy) == 0) - return; - - // Rasterize - dst = &stash->texData[gx + gy * stash->params.width]; - for (y = 0; y < h; y++) { - for (x = 0; x < w; x++) - dst[x] = 0xff; - dst += stash->params.width; - } - - stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], gx); - stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], gy); - stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], gx+w); - stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], gy+h); -} - -FONScontext* fonsCreateInternal(FONSparams* params) -{ - FONScontext* stash = NULL; - - // Allocate memory for the font stash. - stash = (FONScontext*)malloc(sizeof(FONScontext)); - if (stash == NULL) goto error; - memset(stash, 0, sizeof(FONScontext)); - - stash->params = *params; - - // Allocate scratch buffer. - stash->scratch = (unsigned char*)malloc(FONS_SCRATCH_BUF_SIZE); - if (stash->scratch == NULL) goto error; - - // Initialize implementation library - if (!fons__tt_init(stash)) goto error; - - if (stash->params.renderCreate != NULL) { - if (stash->params.renderCreate(stash->params.userPtr, stash->params.width, stash->params.height) == 0) - goto error; - } - - stash->atlas = fons__allocAtlas(stash->params.width, stash->params.height, FONS_INIT_ATLAS_NODES); - if (stash->atlas == NULL) goto error; - - // Allocate space for fonts. - stash->fonts = (FONSfont**)malloc(sizeof(FONSfont*) * FONS_INIT_FONTS); - if (stash->fonts == NULL) goto error; - memset(stash->fonts, 0, sizeof(FONSfont*) * FONS_INIT_FONTS); - stash->cfonts = FONS_INIT_FONTS; - stash->nfonts = 0; - - // Create texture for the cache. - stash->itw = 1.0f/stash->params.width; - stash->ith = 1.0f/stash->params.height; - stash->texData = (unsigned char*)malloc(stash->params.width * stash->params.height); - if (stash->texData == NULL) goto error; - memset(stash->texData, 0, stash->params.width * stash->params.height); - - stash->dirtyRect[0] = stash->params.width; - stash->dirtyRect[1] = stash->params.height; - stash->dirtyRect[2] = 0; - stash->dirtyRect[3] = 0; - - // Add white rect at 0,0 for debug drawing. - fons__addWhiteRect(stash, 2,2); - - fonsPushState(stash); - fonsClearState(stash); - - return stash; - -error: - fonsDeleteInternal(stash); - return NULL; -} - -static FONSstate* fons__getState(FONScontext* stash) -{ - return &stash->states[stash->nstates-1]; -} - -int fonsAddFallbackFont(FONScontext* stash, int base, int fallback) -{ - FONSfont* baseFont = stash->fonts[base]; - if (baseFont->nfallbacks < FONS_MAX_FALLBACKS) { - baseFont->fallbacks[baseFont->nfallbacks++] = fallback; - return 1; - } - return 0; -} - -void fonsSetSize(FONScontext* stash, float size) -{ - fons__getState(stash)->size = size; -} - -void fonsSetColor(FONScontext* stash, unsigned int color) -{ - fons__getState(stash)->color = color; -} - -void fonsSetSpacing(FONScontext* stash, float spacing) -{ - fons__getState(stash)->spacing = spacing; -} - -void fonsSetBlur(FONScontext* stash, float blur) -{ - fons__getState(stash)->blur = blur; -} - -void fonsSetAlign(FONScontext* stash, int align) -{ - fons__getState(stash)->align = align; -} - -void fonsSetFont(FONScontext* stash, int font) -{ - fons__getState(stash)->font = font; -} - -void fonsPushState(FONScontext* stash) -{ - if (stash->nstates >= FONS_MAX_STATES) { - if (stash->handleError) - stash->handleError(stash->errorUptr, FONS_STATES_OVERFLOW, 0); - return; - } - if (stash->nstates > 0) - memcpy(&stash->states[stash->nstates], &stash->states[stash->nstates-1], sizeof(FONSstate)); - stash->nstates++; -} - -void fonsPopState(FONScontext* stash) -{ - if (stash->nstates <= 1) { - if (stash->handleError) - stash->handleError(stash->errorUptr, FONS_STATES_UNDERFLOW, 0); - return; - } - stash->nstates--; -} - -void fonsClearState(FONScontext* stash) -{ - FONSstate* state = fons__getState(stash); - state->size = 12.0f; - state->color = 0xffffffff; - state->font = 0; - state->blur = 0; - state->spacing = 0; - state->align = FONS_ALIGN_LEFT | FONS_ALIGN_BASELINE; -} - -static void fons__freeFont(FONSfont* font) -{ - if (font == NULL) return; - if (font->glyphs) free(font->glyphs); - if (font->freeData && font->data) free(font->data); - free(font); -} - -static int fons__allocFont(FONScontext* stash) -{ - FONSfont* font = NULL; - if (stash->nfonts+1 > stash->cfonts) { - stash->cfonts = stash->cfonts == 0 ? 8 : stash->cfonts * 2; - stash->fonts = (FONSfont**)realloc(stash->fonts, sizeof(FONSfont*) * stash->cfonts); - if (stash->fonts == NULL) - return -1; - } - font = (FONSfont*)malloc(sizeof(FONSfont)); - if (font == NULL) goto error; - memset(font, 0, sizeof(FONSfont)); - - font->glyphs = (FONSglyph*)malloc(sizeof(FONSglyph) * FONS_INIT_GLYPHS); - if (font->glyphs == NULL) goto error; - font->cglyphs = FONS_INIT_GLYPHS; - font->nglyphs = 0; - - stash->fonts[stash->nfonts++] = font; - return stash->nfonts-1; - -error: - fons__freeFont(font); - - return FONS_INVALID; -} - -int fonsAddFont(FONScontext* stash, const char* name, const char* path) -{ - FILE* fp = 0; - int dataSize = 0; - unsigned char* data = NULL; - - // Read in the font data. - fp = fopen(path, "rb"); - if (fp == NULL) goto error; - fseek(fp,0,SEEK_END); - dataSize = (int)ftell(fp); - fseek(fp,0,SEEK_SET); - data = (unsigned char*)malloc(dataSize); - if (data == NULL) goto error; - fread(data, 1, dataSize, fp); - fclose(fp); - fp = 0; - - return fonsAddFontMem(stash, name, data, dataSize, 1); - -error: - if (data) free(data); - if (fp) fclose(fp); - return FONS_INVALID; -} - -int fonsAddFontMem(FONScontext* stash, const char* name, unsigned char* data, int dataSize, int freeData) -{ - int i, ascent, descent, fh, lineGap; - FONSfont* font; - - int idx = fons__allocFont(stash); - if (idx == FONS_INVALID) - return FONS_INVALID; - - font = stash->fonts[idx]; - - strncpy(font->name, name, sizeof(font->name)); - font->name[sizeof(font->name)-1] = '\0'; - - // Init hash lookup. - for (i = 0; i < FONS_HASH_LUT_SIZE; ++i) - font->lut[i] = -1; - - // Read in the font data. - font->dataSize = dataSize; - font->data = data; - font->freeData = (unsigned char)freeData; - - // Init font - stash->nscratch = 0; - if (!fons__tt_loadFont(stash, &font->font, data, dataSize)) goto error; - - // Store normalized line height. The real line height is got - // by multiplying the lineh by font size. - fons__tt_getFontVMetrics( &font->font, &ascent, &descent, &lineGap); - fh = ascent - descent; - font->ascender = (float)ascent / (float)fh; - font->descender = (float)descent / (float)fh; - font->lineh = (float)(fh + lineGap) / (float)fh; - - return idx; - -error: - fons__freeFont(font); - stash->nfonts--; - return FONS_INVALID; -} - -int fonsGetFontByName(FONScontext* s, const char* name) -{ - int i; - for (i = 0; i < s->nfonts; i++) { - if (strcmp(s->fonts[i]->name, name) == 0) - return i; - } - return FONS_INVALID; -} - - -static FONSglyph* fons__allocGlyph(FONSfont* font) -{ - if (font->nglyphs+1 > font->cglyphs) { - font->cglyphs = font->cglyphs == 0 ? 8 : font->cglyphs * 2; - font->glyphs = (FONSglyph*)realloc(font->glyphs, sizeof(FONSglyph) * font->cglyphs); - if (font->glyphs == NULL) return NULL; - } - font->nglyphs++; - return &font->glyphs[font->nglyphs-1]; -} - - -// Based on Exponential blur, Jani Huhtanen, 2006 - -#define APREC 16 -#define ZPREC 7 - -static void fons__blurCols(unsigned char* dst, int w, int h, int dstStride, int alpha) -{ - int x, y; - for (y = 0; y < h; y++) { - int z = 0; // force zero border - for (x = 1; x < w; x++) { - z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC; - dst[x] = (unsigned char)(z >> ZPREC); - } - dst[w-1] = 0; // force zero border - z = 0; - for (x = w-2; x >= 0; x--) { - z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC; - dst[x] = (unsigned char)(z >> ZPREC); - } - dst[0] = 0; // force zero border - dst += dstStride; - } -} - -static void fons__blurRows(unsigned char* dst, int w, int h, int dstStride, int alpha) -{ - int x, y; - for (x = 0; x < w; x++) { - int z = 0; // force zero border - for (y = dstStride; y < h*dstStride; y += dstStride) { - z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC; - dst[y] = (unsigned char)(z >> ZPREC); - } - dst[(h-1)*dstStride] = 0; // force zero border - z = 0; - for (y = (h-2)*dstStride; y >= 0; y -= dstStride) { - z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC; - dst[y] = (unsigned char)(z >> ZPREC); - } - dst[0] = 0; // force zero border - dst++; - } -} - - -static void fons__blur(FONScontext* stash, unsigned char* dst, int w, int h, int dstStride, int blur) -{ - int alpha; - float sigma; - (void)stash; - - if (blur < 1) - return; - // Calculate the alpha such that 90% of the kernel is within the radius. (Kernel extends to infinity) - sigma = (float)blur * 0.57735f; // 1 / sqrt(3) - alpha = (int)((1< 20) iblur = 20; - pad = iblur+2; - - // Reset allocator. - stash->nscratch = 0; - - // Find code point and size. - h = fons__hashint(codepoint) & (FONS_HASH_LUT_SIZE-1); - i = font->lut[h]; - while (i != -1) { - if (font->glyphs[i].codepoint == codepoint && font->glyphs[i].size == isize && font->glyphs[i].blur == iblur) - return &font->glyphs[i]; - i = font->glyphs[i].next; - } - - // Could not find glyph, create it. - scale = fons__tt_getPixelHeightScale(&font->font, size); - g = fons__tt_getGlyphIndex(&font->font, codepoint); - // Try to find the glyph in fallback fonts. - if (g == 0) { - for (i = 0; i < font->nfallbacks; ++i) { - FONSglyph* fallbackGlyph = fons__getGlyph(stash, stash->fonts[font->fallbacks[i]], codepoint, isize, iblur); - if (fallbackGlyph != NULL && fallbackGlyph->index != 0) { - return fallbackGlyph; - } - } - } - fons__tt_buildGlyphBitmap(&font->font, g, size, scale, &advance, &lsb, &x0, &y0, &x1, &y1); - gw = x1-x0 + pad*2; - gh = y1-y0 + pad*2; - - // Find free spot for the rect in the atlas - added = fons__atlasAddRect(stash->atlas, gw, gh, &gx, &gy); - if (added == 0 && stash->handleError != NULL) { - // Atlas is full, let the user to resize the atlas (or not), and try again. - stash->handleError(stash->errorUptr, FONS_ATLAS_FULL, 0); - added = fons__atlasAddRect(stash->atlas, gw, gh, &gx, &gy); - } - if (added == 0) return NULL; - - // Init glyph. - glyph = fons__allocGlyph(font); - glyph->codepoint = codepoint; - glyph->size = isize; - glyph->blur = iblur; - glyph->index = g; - glyph->x0 = (short)gx; - glyph->y0 = (short)gy; - glyph->x1 = (short)(glyph->x0+gw); - glyph->y1 = (short)(glyph->y0+gh); - glyph->xadv = (short)(scale * advance * 10.0f); - glyph->xoff = (short)(x0 - pad); - glyph->yoff = (short)(y0 - pad); - glyph->next = 0; - - // Insert char to hash lookup. - glyph->next = font->lut[h]; - font->lut[h] = font->nglyphs-1; - - // Rasterize - dst = &stash->texData[(glyph->x0+pad) + (glyph->y0+pad) * stash->params.width]; - fons__tt_renderGlyphBitmap(&font->font, dst, gw-pad*2,gh-pad*2, stash->params.width, scale,scale, g); - - // Make sure there is one pixel empty border. - dst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width]; - for (y = 0; y < gh; y++) { - dst[y*stash->params.width] = 0; - dst[gw-1 + y*stash->params.width] = 0; - } - for (x = 0; x < gw; x++) { - dst[x] = 0; - dst[x + (gh-1)*stash->params.width] = 0; - } - - // Debug code to color the glyph background -/* unsigned char* fdst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width]; - for (y = 0; y < gh; y++) { - for (x = 0; x < gw; x++) { - int a = (int)fdst[x+y*stash->params.width] + 20; - if (a > 255) a = 255; - fdst[x+y*stash->params.width] = a; - } - }*/ - - // Blur - if (iblur > 0) { - stash->nscratch = 0; - bdst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width]; - fons__blur(stash, bdst, gw,gh, stash->params.width, iblur); - } - - stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], glyph->x0); - stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], glyph->y0); - stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], glyph->x1); - stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], glyph->y1); - - return glyph; -} - -static void fons__getQuad(FONScontext* stash, FONSfont* font, - int prevGlyphIndex, FONSglyph* glyph, - float scale, float spacing, float* x, float* y, FONSquad* q) -{ - float rx,ry,xoff,yoff,x0,y0,x1,y1; - - if (prevGlyphIndex != -1) { - float adv = fons__tt_getGlyphKernAdvance(&font->font, prevGlyphIndex, glyph->index) * scale; - *x += (int)(adv + spacing + 0.5f); - } - - // Each glyph has 2px border to allow good interpolation, - // one pixel to prevent leaking, and one to allow good interpolation for rendering. - // Inset the texture region by one pixel for correct interpolation. - xoff = (short)(glyph->xoff+1); - yoff = (short)(glyph->yoff+1); - x0 = (float)(glyph->x0+1); - y0 = (float)(glyph->y0+1); - x1 = (float)(glyph->x1-1); - y1 = (float)(glyph->y1-1); - - if (stash->params.flags & FONS_ZERO_TOPLEFT) { - rx = (float)(int)(*x + xoff); - ry = (float)(int)(*y + yoff); - - q->x0 = rx; - q->y0 = ry; - q->x1 = rx + x1 - x0; - q->y1 = ry + y1 - y0; - - q->s0 = x0 * stash->itw; - q->t0 = y0 * stash->ith; - q->s1 = x1 * stash->itw; - q->t1 = y1 * stash->ith; - } else { - rx = (float)(int)(*x + xoff); - ry = (float)(int)(*y - yoff); - - q->x0 = rx; - q->y0 = ry; - q->x1 = rx + x1 - x0; - q->y1 = ry - y1 + y0; - - q->s0 = x0 * stash->itw; - q->t0 = y0 * stash->ith; - q->s1 = x1 * stash->itw; - q->t1 = y1 * stash->ith; - } - - *x += (int)(glyph->xadv / 10.0f + 0.5f); -} - -static void fons__flush(FONScontext* stash) -{ - // Flush texture - if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) { - if (stash->params.renderUpdate != NULL) - stash->params.renderUpdate(stash->params.userPtr, stash->dirtyRect, stash->texData); - // Reset dirty rect - stash->dirtyRect[0] = stash->params.width; - stash->dirtyRect[1] = stash->params.height; - stash->dirtyRect[2] = 0; - stash->dirtyRect[3] = 0; - } - - // Flush triangles - if (stash->nverts > 0) { - if (stash->params.renderDraw != NULL) - stash->params.renderDraw(stash->params.userPtr, stash->verts, stash->tcoords, stash->colors, stash->nverts); - stash->nverts = 0; - } -} - -static __inline void fons__vertex(FONScontext* stash, float x, float y, float s, float t, unsigned int c) -{ - stash->verts[stash->nverts*2+0] = x; - stash->verts[stash->nverts*2+1] = y; - stash->tcoords[stash->nverts*2+0] = s; - stash->tcoords[stash->nverts*2+1] = t; - stash->colors[stash->nverts] = c; - stash->nverts++; -} - -static float fons__getVertAlign(FONScontext* stash, FONSfont* font, int align, short isize) -{ - if (stash->params.flags & FONS_ZERO_TOPLEFT) { - if (align & FONS_ALIGN_TOP) { - return font->ascender * (float)isize/10.0f; - } else if (align & FONS_ALIGN_MIDDLE) { - return (font->ascender + font->descender) / 2.0f * (float)isize/10.0f; - } else if (align & FONS_ALIGN_BASELINE) { - return 0.0f; - } else if (align & FONS_ALIGN_BOTTOM) { - return font->descender * (float)isize/10.0f; - } - } else { - if (align & FONS_ALIGN_TOP) { - return -font->ascender * (float)isize/10.0f; - } else if (align & FONS_ALIGN_MIDDLE) { - return -(font->ascender + font->descender) / 2.0f * (float)isize/10.0f; - } else if (align & FONS_ALIGN_BASELINE) { - return 0.0f; - } else if (align & FONS_ALIGN_BOTTOM) { - return -font->descender * (float)isize/10.0f; - } - } - return 0.0; -} - -float fonsDrawText(FONScontext* stash, - float x, float y, - const char* str, const char* end) -{ - FONSstate* state = fons__getState(stash); - unsigned int codepoint; - unsigned int utf8state = 0; - FONSglyph* glyph = NULL; - FONSquad q; - int prevGlyphIndex = -1; - short isize = (short)(state->size*10.0f); - short iblur = (short)state->blur; - float scale; - FONSfont* font; - float width; - - if (stash == NULL) return x; - if (state->font < 0 || state->font >= stash->nfonts) return x; - font = stash->fonts[state->font]; - if (font->data == NULL) return x; - - scale = fons__tt_getPixelHeightScale(&font->font, (float)isize/10.0f); - - if (end == NULL) - end = str + strlen(str); - - // Align horizontally - if (state->align & FONS_ALIGN_LEFT) { - // empty - } else if (state->align & FONS_ALIGN_RIGHT) { - width = fonsTextBounds(stash, x,y, str, end, NULL); - x -= width; - } else if (state->align & FONS_ALIGN_CENTER) { - width = fonsTextBounds(stash, x,y, str, end, NULL); - x -= width * 0.5f; - } - // Align vertically. - y += fons__getVertAlign(stash, font, state->align, isize); - - for (; str != end; ++str) { - if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str)) - continue; - glyph = fons__getGlyph(stash, font, codepoint, isize, iblur); - if (glyph != NULL) { - fons__getQuad(stash, font, prevGlyphIndex, glyph, scale, state->spacing, &x, &y, &q); - - if (stash->nverts+6 > FONS_VERTEX_COUNT) - fons__flush(stash); - - fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color); - fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color); - fons__vertex(stash, q.x1, q.y0, q.s1, q.t0, state->color); - - fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color); - fons__vertex(stash, q.x0, q.y1, q.s0, q.t1, state->color); - fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color); - } - prevGlyphIndex = glyph != NULL ? glyph->index : -1; - } - fons__flush(stash); - - return x; -} - -int fonsTextIterInit(FONScontext* stash, FONStextIter* iter, - float x, float y, const char* str, const char* end) -{ - FONSstate* state = fons__getState(stash); - float width; - - memset(iter, 0, sizeof(*iter)); - - if (stash == NULL) return 0; - if (state->font < 0 || state->font >= stash->nfonts) return 0; - iter->font = stash->fonts[state->font]; - if (iter->font->data == NULL) return 0; - - iter->isize = (short)(state->size*10.0f); - iter->iblur = (short)state->blur; - iter->scale = fons__tt_getPixelHeightScale(&iter->font->font, (float)iter->isize/10.0f); - - // Align horizontally - if (state->align & FONS_ALIGN_LEFT) { - // empty - } else if (state->align & FONS_ALIGN_RIGHT) { - width = fonsTextBounds(stash, x,y, str, end, NULL); - x -= width; - } else if (state->align & FONS_ALIGN_CENTER) { - width = fonsTextBounds(stash, x,y, str, end, NULL); - x -= width * 0.5f; - } - // Align vertically. - y += fons__getVertAlign(stash, iter->font, state->align, iter->isize); - - if (end == NULL) - end = str + strlen(str); - - iter->x = iter->nextx = x; - iter->y = iter->nexty = y; - iter->spacing = state->spacing; - iter->str = str; - iter->next = str; - iter->end = end; - iter->codepoint = 0; - iter->prevGlyphIndex = -1; - - return 1; -} - -int fonsTextIterNext(FONScontext* stash, FONStextIter* iter, FONSquad* quad) -{ - FONSglyph* glyph = NULL; - const char* str = iter->next; - iter->str = iter->next; - - if (str == iter->end) - return 0; - - for (; str != iter->end; str++) { - if (fons__decutf8(&iter->utf8state, &iter->codepoint, *(const unsigned char*)str)) - continue; - str++; - // Get glyph and quad - iter->x = iter->nextx; - iter->y = iter->nexty; - glyph = fons__getGlyph(stash, iter->font, iter->codepoint, iter->isize, iter->iblur); - if (glyph != NULL) - fons__getQuad(stash, iter->font, iter->prevGlyphIndex, glyph, iter->scale, iter->spacing, &iter->nextx, &iter->nexty, quad); - iter->prevGlyphIndex = glyph != NULL ? glyph->index : -1; - break; - } - iter->next = str; - - return 1; -} - -void fonsDrawDebug(FONScontext* stash, float x, float y) -{ - int i; - int w = stash->params.width; - int h = stash->params.height; - float u = w == 0 ? 0 : (1.0f / w); - float v = h == 0 ? 0 : (1.0f / h); - - if (stash->nverts+6+6 > FONS_VERTEX_COUNT) - fons__flush(stash); - - // Draw background - fons__vertex(stash, x+0, y+0, u, v, 0x0fffffff); - fons__vertex(stash, x+w, y+h, u, v, 0x0fffffff); - fons__vertex(stash, x+w, y+0, u, v, 0x0fffffff); - - fons__vertex(stash, x+0, y+0, u, v, 0x0fffffff); - fons__vertex(stash, x+0, y+h, u, v, 0x0fffffff); - fons__vertex(stash, x+w, y+h, u, v, 0x0fffffff); - - // Draw texture - fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff); - fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff); - fons__vertex(stash, x+w, y+0, 1, 0, 0xffffffff); - - fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff); - fons__vertex(stash, x+0, y+h, 0, 1, 0xffffffff); - fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff); - - // Drawbug draw atlas - for (i = 0; i < stash->atlas->nnodes; i++) { - FONSatlasNode* n = &stash->atlas->nodes[i]; - - if (stash->nverts+6 > FONS_VERTEX_COUNT) - fons__flush(stash); - - fons__vertex(stash, x+n->x+0, y+n->y+0, u, v, 0xc00000ff); - fons__vertex(stash, x+n->x+n->width, y+n->y+1, u, v, 0xc00000ff); - fons__vertex(stash, x+n->x+n->width, y+n->y+0, u, v, 0xc00000ff); - - fons__vertex(stash, x+n->x+0, y+n->y+0, u, v, 0xc00000ff); - fons__vertex(stash, x+n->x+0, y+n->y+1, u, v, 0xc00000ff); - fons__vertex(stash, x+n->x+n->width, y+n->y+1, u, v, 0xc00000ff); - } - - fons__flush(stash); -} - -float fonsTextBounds(FONScontext* stash, - float x, float y, - const char* str, const char* end, - float* bounds) -{ - FONSstate* state = fons__getState(stash); - unsigned int codepoint; - unsigned int utf8state = 0; - FONSquad q; - FONSglyph* glyph = NULL; - int prevGlyphIndex = -1; - short isize = (short)(state->size*10.0f); - short iblur = (short)state->blur; - float scale; - FONSfont* font; - float startx, advance; - float minx, miny, maxx, maxy; - - if (stash == NULL) return 0; - if (state->font < 0 || state->font >= stash->nfonts) return 0; - font = stash->fonts[state->font]; - if (font->data == NULL) return 0; - - scale = fons__tt_getPixelHeightScale(&font->font, (float)isize/10.0f); - - // Align vertically. - y += fons__getVertAlign(stash, font, state->align, isize); - - minx = maxx = x; - miny = maxy = y; - startx = x; - - if (end == NULL) - end = str + strlen(str); - - for (; str != end; ++str) { - if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str)) - continue; - glyph = fons__getGlyph(stash, font, codepoint, isize, iblur); - if (glyph != NULL) { - fons__getQuad(stash, font, prevGlyphIndex, glyph, scale, state->spacing, &x, &y, &q); - if (q.x0 < minx) minx = q.x0; - if (q.x1 > maxx) maxx = q.x1; - if (stash->params.flags & FONS_ZERO_TOPLEFT) { - if (q.y0 < miny) miny = q.y0; - if (q.y1 > maxy) maxy = q.y1; - } else { - if (q.y1 < miny) miny = q.y1; - if (q.y0 > maxy) maxy = q.y0; - } - } - prevGlyphIndex = glyph != NULL ? glyph->index : -1; - } - - advance = x - startx; - - // Align horizontally - if (state->align & FONS_ALIGN_LEFT) { - // empty - } else if (state->align & FONS_ALIGN_RIGHT) { - minx -= advance; - maxx -= advance; - } else if (state->align & FONS_ALIGN_CENTER) { - minx -= advance * 0.5f; - maxx -= advance * 0.5f; - } - - if (bounds) { - bounds[0] = minx; - bounds[1] = miny; - bounds[2] = maxx; - bounds[3] = maxy; - } - - return advance; -} - -void fonsVertMetrics(FONScontext* stash, - float* ascender, float* descender, float* lineh) -{ - FONSfont* font; - FONSstate* state = fons__getState(stash); - short isize; - - if (stash == NULL) return; - if (state->font < 0 || state->font >= stash->nfonts) return; - font = stash->fonts[state->font]; - isize = (short)(state->size*10.0f); - if (font->data == NULL) return; - - if (ascender) - *ascender = font->ascender*isize/10.0f; - if (descender) - *descender = font->descender*isize/10.0f; - if (lineh) - *lineh = font->lineh*isize/10.0f; -} - -void fonsLineBounds(FONScontext* stash, float y, float* miny, float* maxy) -{ - FONSfont* font; - FONSstate* state = fons__getState(stash); - short isize; - - if (stash == NULL) return; - if (state->font < 0 || state->font >= stash->nfonts) return; - font = stash->fonts[state->font]; - isize = (short)(state->size*10.0f); - if (font->data == NULL) return; - - y += fons__getVertAlign(stash, font, state->align, isize); - - if (stash->params.flags & FONS_ZERO_TOPLEFT) { - *miny = y - font->ascender * (float)isize/10.0f; - *maxy = *miny + font->lineh*isize/10.0f; - } else { - *maxy = y + font->descender * (float)isize/10.0f; - *miny = *maxy - font->lineh*isize/10.0f; - } -} - -const unsigned char* fonsGetTextureData(FONScontext* stash, int* width, int* height) -{ - if (width != NULL) - *width = stash->params.width; - if (height != NULL) - *height = stash->params.height; - return stash->texData; -} - -int fonsValidateTexture(FONScontext* stash, int* dirty) -{ - if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) { - dirty[0] = stash->dirtyRect[0]; - dirty[1] = stash->dirtyRect[1]; - dirty[2] = stash->dirtyRect[2]; - dirty[3] = stash->dirtyRect[3]; - // Reset dirty rect - stash->dirtyRect[0] = stash->params.width; - stash->dirtyRect[1] = stash->params.height; - stash->dirtyRect[2] = 0; - stash->dirtyRect[3] = 0; - return 1; - } - return 0; -} - -void fonsDeleteInternal(FONScontext* stash) -{ - int i; - if (stash == NULL) return; - - if (stash->params.renderDelete) - stash->params.renderDelete(stash->params.userPtr); - - for (i = 0; i < stash->nfonts; ++i) - fons__freeFont(stash->fonts[i]); - - if (stash->atlas) fons__deleteAtlas(stash->atlas); - if (stash->fonts) free(stash->fonts); - if (stash->texData) free(stash->texData); - if (stash->scratch) free(stash->scratch); - free(stash); -} - -void fonsSetErrorCallback(FONScontext* stash, void (*callback)(void* uptr, int error, int val), void* uptr) -{ - if (stash == NULL) return; - stash->handleError = callback; - stash->errorUptr = uptr; -} - -void fonsGetAtlasSize(FONScontext* stash, int* width, int* height) -{ - if (stash == NULL) return; - *width = stash->params.width; - *height = stash->params.height; -} - -int fonsExpandAtlas(FONScontext* stash, int width, int height) -{ - int i, maxy = 0; - unsigned char* data = NULL; - if (stash == NULL) return 0; - - width = fons__maxi(width, stash->params.width); - height = fons__maxi(height, stash->params.height); - - if (width == stash->params.width && height == stash->params.height) - return 1; - - // Flush pending glyphs. - fons__flush(stash); - - // Create new texture - if (stash->params.renderResize != NULL) { - if (stash->params.renderResize(stash->params.userPtr, width, height) == 0) - return 0; - } - // Copy old texture data over. - data = (unsigned char*)malloc(width * height); - if (data == NULL) - return 0; - for (i = 0; i < stash->params.height; i++) { - unsigned char* dst = &data[i*width]; - unsigned char* src = &stash->texData[i*stash->params.width]; - memcpy(dst, src, stash->params.width); - if (width > stash->params.width) - memset(dst+stash->params.width, 0, width - stash->params.width); - } - if (height > stash->params.height) - memset(&data[stash->params.height * width], 0, (height - stash->params.height) * width); - - free(stash->texData); - stash->texData = data; - - // Increase atlas size - fons__atlasExpand(stash->atlas, width, height); - - // Add existing data as dirty. - for (i = 0; i < stash->atlas->nnodes; i++) - maxy = fons__maxi(maxy, stash->atlas->nodes[i].y); - stash->dirtyRect[0] = 0; - stash->dirtyRect[1] = 0; - stash->dirtyRect[2] = stash->params.width; - stash->dirtyRect[3] = maxy; - - stash->params.width = width; - stash->params.height = height; - stash->itw = 1.0f/stash->params.width; - stash->ith = 1.0f/stash->params.height; - - return 1; -} - -int fonsResetAtlas(FONScontext* stash, int width, int height) -{ - int i, j; - if (stash == NULL) return 0; - - // Flush pending glyphs. - fons__flush(stash); - - // Create new texture - if (stash->params.renderResize != NULL) { - if (stash->params.renderResize(stash->params.userPtr, width, height) == 0) - return 0; - } - - // Reset atlas - fons__atlasReset(stash->atlas, width, height); - - // Clear texture data. - stash->texData = (unsigned char*)realloc(stash->texData, width * height); - if (stash->texData == NULL) return 0; - memset(stash->texData, 0, width * height); - - // Reset dirty rect - stash->dirtyRect[0] = width; - stash->dirtyRect[1] = height; - stash->dirtyRect[2] = 0; - stash->dirtyRect[3] = 0; - - // Reset cached glyphs - for (i = 0; i < stash->nfonts; i++) { - FONSfont* font = stash->fonts[i]; - font->nglyphs = 0; - for (j = 0; j < FONS_HASH_LUT_SIZE; j++) - font->lut[j] = -1; - } - - stash->params.width = width; - stash->params.height = height; - stash->itw = 1.0f/stash->params.width; - stash->ith = 1.0f/stash->params.height; - - // Add white rect at 0,0 for debug drawing. - fons__addWhiteRect(stash, 2,2); - - return 1; -} - - -#endif diff --git a/third_party/nanovg/nanovg.c b/third_party/nanovg/nanovg.c deleted file mode 100644 index 51f972ca5b..0000000000 --- a/third_party/nanovg/nanovg.c +++ /dev/null @@ -1,2870 +0,0 @@ -// -// Copyright (c) 2013 Mikko Mononen memon@inside.org -// -// This software is provided 'as-is', without any express or implied -// warranty. In no event will the authors be held liable for any damages -// arising from the use of this software. -// Permission is granted to anyone to use this software for any purpose, -// including commercial applications, and to alter it and redistribute it -// freely, subject to the following restrictions: -// 1. The origin of this software must not be misrepresented; you must not -// claim that you wrote the original software. If you use this software -// in a product, an acknowledgment in the product documentation would be -// appreciated but is not required. -// 2. Altered source versions must be plainly marked as such, and must not be -// misrepresented as being the original software. -// 3. This notice may not be removed or altered from any source distribution. -// - -#include -#include -#include -#include - -#include "nanovg.h" -#define FONTSTASH_IMPLEMENTATION -#include "fontstash.h" -#define STB_IMAGE_IMPLEMENTATION -#include "stb_image.h" - -#ifdef _MSC_VER -#pragma warning(disable: 4100) // unreferenced formal parameter -#pragma warning(disable: 4127) // conditional expression is constant -#pragma warning(disable: 4204) // nonstandard extension used : non-constant aggregate initializer -#pragma warning(disable: 4706) // assignment within conditional expression -#endif - -#define NVG_INIT_FONTIMAGE_SIZE 512 -#define NVG_MAX_FONTIMAGE_SIZE 2048 -#define NVG_MAX_FONTIMAGES 4 - -#define NVG_INIT_COMMANDS_SIZE 256 -#define NVG_INIT_POINTS_SIZE 128 -#define NVG_INIT_PATHS_SIZE 16 -#define NVG_INIT_VERTS_SIZE 256 -#define NVG_MAX_STATES 32 - -#define NVG_KAPPA90 0.5522847493f // Length proportional to radius of a cubic bezier handle for 90deg arcs. - -#define NVG_COUNTOF(arr) (sizeof(arr) / sizeof(0[arr])) - - -enum NVGcommands { - NVG_MOVETO = 0, - NVG_LINETO = 1, - NVG_BEZIERTO = 2, - NVG_CLOSE = 3, - NVG_WINDING = 4, -}; - -enum NVGpointFlags -{ - NVG_PT_CORNER = 0x01, - NVG_PT_LEFT = 0x02, - NVG_PT_BEVEL = 0x04, - NVG_PR_INNERBEVEL = 0x08, -}; - -struct NVGstate { - NVGcompositeOperationState compositeOperation; - NVGpaint fill; - NVGpaint stroke; - float strokeWidth; - float miterLimit; - int lineJoin; - int lineCap; - float alpha; - float xform[6]; - NVGscissor scissor; - float fontSize; - float letterSpacing; - float lineHeight; - float fontBlur; - int textAlign; - int fontId; -}; -typedef struct NVGstate NVGstate; - -struct NVGpoint { - float x,y; - float dx, dy; - float len; - float dmx, dmy; - unsigned char flags; -}; -typedef struct NVGpoint NVGpoint; - -struct NVGpathCache { - NVGpoint* points; - int npoints; - int cpoints; - NVGpath* paths; - int npaths; - int cpaths; - NVGvertex* verts; - int nverts; - int cverts; - float bounds[4]; -}; -typedef struct NVGpathCache NVGpathCache; - -struct NVGcontext { - NVGparams params; - float* commands; - int ccommands; - int ncommands; - float commandx, commandy; - NVGstate states[NVG_MAX_STATES]; - int nstates; - NVGpathCache* cache; - float tessTol; - float distTol; - float fringeWidth; - float devicePxRatio; - struct FONScontext* fs; - int fontImages[NVG_MAX_FONTIMAGES]; - int fontImageIdx; - int drawCallCount; - int fillTriCount; - int strokeTriCount; - int textTriCount; -}; - -static float nvg__sqrtf(float a) { return sqrtf(a); } -static float nvg__modf(float a, float b) { return fmodf(a, b); } -static float nvg__sinf(float a) { return sinf(a); } -static float nvg__cosf(float a) { return cosf(a); } -static float nvg__tanf(float a) { return tanf(a); } -static float nvg__atan2f(float a,float b) { return atan2f(a, b); } -static float nvg__acosf(float a) { return acosf(a); } - -static int nvg__mini(int a, int b) { return a < b ? a : b; } -static int nvg__maxi(int a, int b) { return a > b ? a : b; } -static int nvg__clampi(int a, int mn, int mx) { return a < mn ? mn : (a > mx ? mx : a); } -static float nvg__minf(float a, float b) { return a < b ? a : b; } -static float nvg__maxf(float a, float b) { return a > b ? a : b; } -static float nvg__absf(float a) { return a >= 0.0f ? a : -a; } -static float nvg__signf(float a) { return a >= 0.0f ? 1.0f : -1.0f; } -static float nvg__clampf(float a, float mn, float mx) { return a < mn ? mn : (a > mx ? mx : a); } -static float nvg__cross(float dx0, float dy0, float dx1, float dy1) { return dx1*dy0 - dx0*dy1; } - -static float nvg__normalize(float *x, float* y) -{ - float d = nvg__sqrtf((*x)*(*x) + (*y)*(*y)); - if (d > 1e-6f) { - float id = 1.0f / d; - *x *= id; - *y *= id; - } - return d; -} - - -static void nvg__deletePathCache(NVGpathCache* c) -{ - if (c == NULL) return; - if (c->points != NULL) free(c->points); - if (c->paths != NULL) free(c->paths); - if (c->verts != NULL) free(c->verts); - free(c); -} - -static NVGpathCache* nvg__allocPathCache(void) -{ - NVGpathCache* c = (NVGpathCache*)malloc(sizeof(NVGpathCache)); - if (c == NULL) goto error; - memset(c, 0, sizeof(NVGpathCache)); - - c->points = (NVGpoint*)malloc(sizeof(NVGpoint)*NVG_INIT_POINTS_SIZE); - if (!c->points) goto error; - c->npoints = 0; - c->cpoints = NVG_INIT_POINTS_SIZE; - - c->paths = (NVGpath*)malloc(sizeof(NVGpath)*NVG_INIT_PATHS_SIZE); - if (!c->paths) goto error; - c->npaths = 0; - c->cpaths = NVG_INIT_PATHS_SIZE; - - c->verts = (NVGvertex*)malloc(sizeof(NVGvertex)*NVG_INIT_VERTS_SIZE); - if (!c->verts) goto error; - c->nverts = 0; - c->cverts = NVG_INIT_VERTS_SIZE; - - return c; -error: - nvg__deletePathCache(c); - return NULL; -} - -static void nvg__setDevicePixelRatio(NVGcontext* ctx, float ratio) -{ - ctx->tessTol = 0.25f / ratio; - ctx->distTol = 0.01f / ratio; - ctx->fringeWidth = 1.0f / ratio; - ctx->devicePxRatio = ratio; -} - -static NVGcompositeOperationState nvg__compositeOperationState(int op) -{ - int sfactor, dfactor; - - if (op == NVG_SOURCE_OVER) - { - sfactor = NVG_ONE; - dfactor = NVG_ONE_MINUS_SRC_ALPHA; - } - else if (op == NVG_SOURCE_IN) - { - sfactor = NVG_DST_ALPHA; - dfactor = NVG_ZERO; - } - else if (op == NVG_SOURCE_OUT) - { - sfactor = NVG_ONE_MINUS_DST_ALPHA; - dfactor = NVG_ZERO; - } - else if (op == NVG_ATOP) - { - sfactor = NVG_DST_ALPHA; - dfactor = NVG_ONE_MINUS_SRC_ALPHA; - } - else if (op == NVG_DESTINATION_OVER) - { - sfactor = NVG_ONE_MINUS_DST_ALPHA; - dfactor = NVG_ONE; - } - else if (op == NVG_DESTINATION_IN) - { - sfactor = NVG_ZERO; - dfactor = NVG_SRC_ALPHA; - } - else if (op == NVG_DESTINATION_OUT) - { - sfactor = NVG_ZERO; - dfactor = NVG_ONE_MINUS_SRC_ALPHA; - } - else if (op == NVG_DESTINATION_ATOP) - { - sfactor = NVG_ONE_MINUS_DST_ALPHA; - dfactor = NVG_SRC_ALPHA; - } - else if (op == NVG_LIGHTER) - { - sfactor = NVG_ONE; - dfactor = NVG_ONE; - } - else if (op == NVG_COPY) - { - sfactor = NVG_ONE; - dfactor = NVG_ZERO; - } - else if (op == NVG_XOR) - { - sfactor = NVG_ONE_MINUS_DST_ALPHA; - dfactor = NVG_ONE_MINUS_SRC_ALPHA; - } - - NVGcompositeOperationState state; - state.srcRGB = sfactor; - state.dstRGB = dfactor; - state.srcAlpha = sfactor; - state.dstAlpha = dfactor; - return state; -} - -static NVGstate* nvg__getState(NVGcontext* ctx) -{ - return &ctx->states[ctx->nstates-1]; -} - -NVGcontext* nvgCreateInternal(NVGparams* params) -{ - FONSparams fontParams; - NVGcontext* ctx = (NVGcontext*)malloc(sizeof(NVGcontext)); - int i; - if (ctx == NULL) goto error; - memset(ctx, 0, sizeof(NVGcontext)); - - ctx->params = *params; - for (i = 0; i < NVG_MAX_FONTIMAGES; i++) - ctx->fontImages[i] = 0; - - ctx->commands = (float*)malloc(sizeof(float)*NVG_INIT_COMMANDS_SIZE); - if (!ctx->commands) goto error; - ctx->ncommands = 0; - ctx->ccommands = NVG_INIT_COMMANDS_SIZE; - - ctx->cache = nvg__allocPathCache(); - if (ctx->cache == NULL) goto error; - - nvgSave(ctx); - nvgReset(ctx); - - nvg__setDevicePixelRatio(ctx, 1.0f); - - if (ctx->params.renderCreate(ctx->params.userPtr) == 0) goto error; - - // Init font rendering - memset(&fontParams, 0, sizeof(fontParams)); - fontParams.width = NVG_INIT_FONTIMAGE_SIZE; - fontParams.height = NVG_INIT_FONTIMAGE_SIZE; - fontParams.flags = FONS_ZERO_TOPLEFT; - fontParams.renderCreate = NULL; - fontParams.renderUpdate = NULL; - fontParams.renderDraw = NULL; - fontParams.renderDelete = NULL; - fontParams.userPtr = NULL; - ctx->fs = fonsCreateInternal(&fontParams); - if (ctx->fs == NULL) goto error; - - // Create font texture - ctx->fontImages[0] = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, fontParams.width, fontParams.height, 0, NULL); - if (ctx->fontImages[0] == 0) goto error; - ctx->fontImageIdx = 0; - - return ctx; - -error: - nvgDeleteInternal(ctx); - return 0; -} - -NVGparams* nvgInternalParams(NVGcontext* ctx) -{ - return &ctx->params; -} - -void nvgDeleteInternal(NVGcontext* ctx) -{ - int i; - if (ctx == NULL) return; - if (ctx->commands != NULL) free(ctx->commands); - if (ctx->cache != NULL) nvg__deletePathCache(ctx->cache); - - if (ctx->fs) - fonsDeleteInternal(ctx->fs); - - for (i = 0; i < NVG_MAX_FONTIMAGES; i++) { - if (ctx->fontImages[i] != 0) { - nvgDeleteImage(ctx, ctx->fontImages[i]); - ctx->fontImages[i] = 0; - } - } - - if (ctx->params.renderDelete != NULL) - ctx->params.renderDelete(ctx->params.userPtr); - - free(ctx); -} - -void nvgBeginFrame(NVGcontext* ctx, int windowWidth, int windowHeight, float devicePixelRatio) -{ -/* printf("Tris: draws:%d fill:%d stroke:%d text:%d TOT:%d\n", - ctx->drawCallCount, ctx->fillTriCount, ctx->strokeTriCount, ctx->textTriCount, - ctx->fillTriCount+ctx->strokeTriCount+ctx->textTriCount);*/ - - ctx->nstates = 0; - nvgSave(ctx); - nvgReset(ctx); - - nvg__setDevicePixelRatio(ctx, devicePixelRatio); - - ctx->params.renderViewport(ctx->params.userPtr, windowWidth, windowHeight, devicePixelRatio); - - ctx->drawCallCount = 0; - ctx->fillTriCount = 0; - ctx->strokeTriCount = 0; - ctx->textTriCount = 0; -} - -void nvgCancelFrame(NVGcontext* ctx) -{ - ctx->params.renderCancel(ctx->params.userPtr); -} - -void nvgEndFrame(NVGcontext* ctx) -{ - NVGstate* state = nvg__getState(ctx); - ctx->params.renderFlush(ctx->params.userPtr, state->compositeOperation); - if (ctx->fontImageIdx != 0) { - int fontImage = ctx->fontImages[ctx->fontImageIdx]; - int i, j, iw, ih; - // delete images that smaller than current one - if (fontImage == 0) - return; - nvgImageSize(ctx, fontImage, &iw, &ih); - for (i = j = 0; i < ctx->fontImageIdx; i++) { - if (ctx->fontImages[i] != 0) { - int nw, nh; - nvgImageSize(ctx, ctx->fontImages[i], &nw, &nh); - if (nw < iw || nh < ih) - nvgDeleteImage(ctx, ctx->fontImages[i]); - else - ctx->fontImages[j++] = ctx->fontImages[i]; - } - } - // make current font image to first - ctx->fontImages[j++] = ctx->fontImages[0]; - ctx->fontImages[0] = fontImage; - ctx->fontImageIdx = 0; - // clear all images after j - for (i = j; i < NVG_MAX_FONTIMAGES; i++) - ctx->fontImages[i] = 0; - } -} - -NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b) -{ - return nvgRGBA(r,g,b,255); -} - -NVGcolor nvgRGBf(float r, float g, float b) -{ - return nvgRGBAf(r,g,b,1.0f); -} - -NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a) -{ - NVGcolor color; - // Use longer initialization to suppress warning. - color.r = r / 255.0f; - color.g = g / 255.0f; - color.b = b / 255.0f; - color.a = a / 255.0f; - return color; -} - -NVGcolor nvgRGBAf(float r, float g, float b, float a) -{ - NVGcolor color; - // Use longer initialization to suppress warning. - color.r = r; - color.g = g; - color.b = b; - color.a = a; - return color; -} - -NVGcolor nvgTransRGBA(NVGcolor c, unsigned char a) -{ - c.a = a / 255.0f; - return c; -} - -NVGcolor nvgTransRGBAf(NVGcolor c, float a) -{ - c.a = a; - return c; -} - -NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u) -{ - int i; - float oneminu; - NVGcolor cint = {0}; - - u = nvg__clampf(u, 0.0f, 1.0f); - oneminu = 1.0f - u; - for( i = 0; i <4; i++ ) - { - cint.rgba[i] = c0.rgba[i] * oneminu + c1.rgba[i] * u; - } - - return cint; -} - -NVGcolor nvgHSL(float h, float s, float l) -{ - return nvgHSLA(h,s,l,255); -} - -static float nvg__hue(float h, float m1, float m2) -{ - if (h < 0) h += 1; - if (h > 1) h -= 1; - if (h < 1.0f/6.0f) - return m1 + (m2 - m1) * h * 6.0f; - else if (h < 3.0f/6.0f) - return m2; - else if (h < 4.0f/6.0f) - return m1 + (m2 - m1) * (2.0f/3.0f - h) * 6.0f; - return m1; -} - -NVGcolor nvgHSLA(float h, float s, float l, unsigned char a) -{ - float m1, m2; - NVGcolor col; - h = nvg__modf(h, 1.0f); - if (h < 0.0f) h += 1.0f; - s = nvg__clampf(s, 0.0f, 1.0f); - l = nvg__clampf(l, 0.0f, 1.0f); - m2 = l <= 0.5f ? (l * (1 + s)) : (l + s - l * s); - m1 = 2 * l - m2; - col.r = nvg__clampf(nvg__hue(h + 1.0f/3.0f, m1, m2), 0.0f, 1.0f); - col.g = nvg__clampf(nvg__hue(h, m1, m2), 0.0f, 1.0f); - col.b = nvg__clampf(nvg__hue(h - 1.0f/3.0f, m1, m2), 0.0f, 1.0f); - col.a = a/255.0f; - return col; -} - -void nvgTransformIdentity(float* t) -{ - t[0] = 1.0f; t[1] = 0.0f; - t[2] = 0.0f; t[3] = 1.0f; - t[4] = 0.0f; t[5] = 0.0f; -} - -void nvgTransformTranslate(float* t, float tx, float ty) -{ - t[0] = 1.0f; t[1] = 0.0f; - t[2] = 0.0f; t[3] = 1.0f; - t[4] = tx; t[5] = ty; -} - -void nvgTransformScale(float* t, float sx, float sy) -{ - t[0] = sx; t[1] = 0.0f; - t[2] = 0.0f; t[3] = sy; - t[4] = 0.0f; t[5] = 0.0f; -} - -void nvgTransformRotate(float* t, float a) -{ - float cs = nvg__cosf(a), sn = nvg__sinf(a); - t[0] = cs; t[1] = sn; - t[2] = -sn; t[3] = cs; - t[4] = 0.0f; t[5] = 0.0f; -} - -void nvgTransformSkewX(float* t, float a) -{ - t[0] = 1.0f; t[1] = 0.0f; - t[2] = nvg__tanf(a); t[3] = 1.0f; - t[4] = 0.0f; t[5] = 0.0f; -} - -void nvgTransformSkewY(float* t, float a) -{ - t[0] = 1.0f; t[1] = nvg__tanf(a); - t[2] = 0.0f; t[3] = 1.0f; - t[4] = 0.0f; t[5] = 0.0f; -} - -void nvgTransformMultiply(float* t, const float* s) -{ - float t0 = t[0] * s[0] + t[1] * s[2]; - float t2 = t[2] * s[0] + t[3] * s[2]; - float t4 = t[4] * s[0] + t[5] * s[2] + s[4]; - t[1] = t[0] * s[1] + t[1] * s[3]; - t[3] = t[2] * s[1] + t[3] * s[3]; - t[5] = t[4] * s[1] + t[5] * s[3] + s[5]; - t[0] = t0; - t[2] = t2; - t[4] = t4; -} - -void nvgTransformPremultiply(float* t, const float* s) -{ - float s2[6]; - memcpy(s2, s, sizeof(float)*6); - nvgTransformMultiply(s2, t); - memcpy(t, s2, sizeof(float)*6); -} - -int nvgTransformInverse(float* inv, const float* t) -{ - double invdet, det = (double)t[0] * t[3] - (double)t[2] * t[1]; - if (det > -1e-6 && det < 1e-6) { - nvgTransformIdentity(inv); - return 0; - } - invdet = 1.0 / det; - inv[0] = (float)(t[3] * invdet); - inv[2] = (float)(-t[2] * invdet); - inv[4] = (float)(((double)t[2] * t[5] - (double)t[3] * t[4]) * invdet); - inv[1] = (float)(-t[1] * invdet); - inv[3] = (float)(t[0] * invdet); - inv[5] = (float)(((double)t[1] * t[4] - (double)t[0] * t[5]) * invdet); - return 1; -} - -void nvgTransformPoint(float* dx, float* dy, const float* t, float sx, float sy) -{ - *dx = sx*t[0] + sy*t[2] + t[4]; - *dy = sx*t[1] + sy*t[3] + t[5]; -} - -float nvgDegToRad(float deg) -{ - return deg / 180.0f * NVG_PI; -} - -float nvgRadToDeg(float rad) -{ - return rad / NVG_PI * 180.0f; -} - -static void nvg__setPaintColor(NVGpaint* p, NVGcolor color) -{ - memset(p, 0, sizeof(*p)); - nvgTransformIdentity(p->xform); - p->radius = 0.0f; - p->feather = 1.0f; - p->innerColor = color; - p->outerColor = color; -} - - -// State handling -void nvgSave(NVGcontext* ctx) -{ - if (ctx->nstates >= NVG_MAX_STATES) - return; - if (ctx->nstates > 0) - memcpy(&ctx->states[ctx->nstates], &ctx->states[ctx->nstates-1], sizeof(NVGstate)); - ctx->nstates++; -} - -void nvgRestore(NVGcontext* ctx) -{ - if (ctx->nstates <= 1) - return; - ctx->nstates--; -} - -void nvgReset(NVGcontext* ctx) -{ - NVGstate* state = nvg__getState(ctx); - memset(state, 0, sizeof(*state)); - - nvg__setPaintColor(&state->fill, nvgRGBA(255,255,255,255)); - nvg__setPaintColor(&state->stroke, nvgRGBA(0,0,0,255)); - state->compositeOperation = nvg__compositeOperationState(NVG_SOURCE_OVER); - state->strokeWidth = 1.0f; - state->miterLimit = 10.0f; - state->lineCap = NVG_BUTT; - state->lineJoin = NVG_MITER; - state->alpha = 1.0f; - nvgTransformIdentity(state->xform); - - state->scissor.extent[0] = -1.0f; - state->scissor.extent[1] = -1.0f; - - state->fontSize = 16.0f; - state->letterSpacing = 0.0f; - state->lineHeight = 1.0f; - state->fontBlur = 0.0f; - state->textAlign = NVG_ALIGN_LEFT | NVG_ALIGN_BASELINE; - state->fontId = 0; -} - -// State setting -void nvgStrokeWidth(NVGcontext* ctx, float width) -{ - NVGstate* state = nvg__getState(ctx); - state->strokeWidth = width; -} - -void nvgMiterLimit(NVGcontext* ctx, float limit) -{ - NVGstate* state = nvg__getState(ctx); - state->miterLimit = limit; -} - -void nvgLineCap(NVGcontext* ctx, int cap) -{ - NVGstate* state = nvg__getState(ctx); - state->lineCap = cap; -} - -void nvgLineJoin(NVGcontext* ctx, int join) -{ - NVGstate* state = nvg__getState(ctx); - state->lineJoin = join; -} - -void nvgGlobalAlpha(NVGcontext* ctx, float alpha) -{ - NVGstate* state = nvg__getState(ctx); - state->alpha = alpha; -} - -void nvgTransform(NVGcontext* ctx, float a, float b, float c, float d, float e, float f) -{ - NVGstate* state = nvg__getState(ctx); - float t[6] = { a, b, c, d, e, f }; - nvgTransformPremultiply(state->xform, t); -} - -void nvgResetTransform(NVGcontext* ctx) -{ - NVGstate* state = nvg__getState(ctx); - nvgTransformIdentity(state->xform); -} - -void nvgTranslate(NVGcontext* ctx, float x, float y) -{ - NVGstate* state = nvg__getState(ctx); - float t[6]; - nvgTransformTranslate(t, x,y); - nvgTransformPremultiply(state->xform, t); -} - -void nvgRotate(NVGcontext* ctx, float angle) -{ - NVGstate* state = nvg__getState(ctx); - float t[6]; - nvgTransformRotate(t, angle); - nvgTransformPremultiply(state->xform, t); -} - -void nvgSkewX(NVGcontext* ctx, float angle) -{ - NVGstate* state = nvg__getState(ctx); - float t[6]; - nvgTransformSkewX(t, angle); - nvgTransformPremultiply(state->xform, t); -} - -void nvgSkewY(NVGcontext* ctx, float angle) -{ - NVGstate* state = nvg__getState(ctx); - float t[6]; - nvgTransformSkewY(t, angle); - nvgTransformPremultiply(state->xform, t); -} - -void nvgScale(NVGcontext* ctx, float x, float y) -{ - NVGstate* state = nvg__getState(ctx); - float t[6]; - nvgTransformScale(t, x,y); - nvgTransformPremultiply(state->xform, t); -} - -void nvgCurrentTransform(NVGcontext* ctx, float* xform) -{ - NVGstate* state = nvg__getState(ctx); - if (xform == NULL) return; - memcpy(xform, state->xform, sizeof(float)*6); -} - -void nvgStrokeColor(NVGcontext* ctx, NVGcolor color) -{ - NVGstate* state = nvg__getState(ctx); - nvg__setPaintColor(&state->stroke, color); -} - -void nvgStrokePaint(NVGcontext* ctx, NVGpaint paint) -{ - NVGstate* state = nvg__getState(ctx); - state->stroke = paint; - nvgTransformMultiply(state->stroke.xform, state->xform); -} - -void nvgFillColor(NVGcontext* ctx, NVGcolor color) -{ - NVGstate* state = nvg__getState(ctx); - nvg__setPaintColor(&state->fill, color); -} - -void nvgFillPaint(NVGcontext* ctx, NVGpaint paint) -{ - NVGstate* state = nvg__getState(ctx); - state->fill = paint; - nvgTransformMultiply(state->fill.xform, state->xform); -} - -int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags) -{ - int w, h, n, image; - unsigned char* img; - stbi_set_unpremultiply_on_load(1); - stbi_convert_iphone_png_to_rgb(1); - img = stbi_load(filename, &w, &h, &n, 4); - if (img == NULL) { -// printf("Failed to load %s - %s\n", filename, stbi_failure_reason()); - return 0; - } - image = nvgCreateImageRGBA(ctx, w, h, imageFlags, img); - stbi_image_free(img); - return image; -} - -int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, unsigned char* data, int ndata) -{ - int w, h, n, image; - unsigned char* img = stbi_load_from_memory(data, ndata, &w, &h, &n, 4); - if (img == NULL) { -// printf("Failed to load %s - %s\n", filename, stbi_failure_reason()); - return 0; - } - image = nvgCreateImageRGBA(ctx, w, h, imageFlags, img); - stbi_image_free(img); - return image; -} - -int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data) -{ - return ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_RGBA, w, h, imageFlags, data); -} - -void nvgUpdateImage(NVGcontext* ctx, int image, const unsigned char* data) -{ - int w, h; - ctx->params.renderGetTextureSize(ctx->params.userPtr, image, &w, &h); - ctx->params.renderUpdateTexture(ctx->params.userPtr, image, 0,0, w,h, data); -} - -void nvgImageSize(NVGcontext* ctx, int image, int* w, int* h) -{ - ctx->params.renderGetTextureSize(ctx->params.userPtr, image, w, h); -} - -void nvgDeleteImage(NVGcontext* ctx, int image) -{ - ctx->params.renderDeleteTexture(ctx->params.userPtr, image); -} - -NVGpaint nvgLinearGradient(NVGcontext* ctx, - float sx, float sy, float ex, float ey, - NVGcolor icol, NVGcolor ocol) -{ - NVGpaint p; - float dx, dy, d; - const float large = 1e5; - NVG_NOTUSED(ctx); - memset(&p, 0, sizeof(p)); - - // Calculate transform aligned to the line - dx = ex - sx; - dy = ey - sy; - d = sqrtf(dx*dx + dy*dy); - if (d > 0.0001f) { - dx /= d; - dy /= d; - } else { - dx = 0; - dy = 1; - } - - p.xform[0] = dy; p.xform[1] = -dx; - p.xform[2] = dx; p.xform[3] = dy; - p.xform[4] = sx - dx*large; p.xform[5] = sy - dy*large; - - p.extent[0] = large; - p.extent[1] = large + d*0.5f; - - p.radius = 0.0f; - - p.feather = nvg__maxf(1.0f, d); - - p.innerColor = icol; - p.outerColor = ocol; - - return p; -} - -NVGpaint nvgRadialGradient(NVGcontext* ctx, - float cx, float cy, float inr, float outr, - NVGcolor icol, NVGcolor ocol) -{ - NVGpaint p; - float r = (inr+outr)*0.5f; - float f = (outr-inr); - NVG_NOTUSED(ctx); - memset(&p, 0, sizeof(p)); - - nvgTransformIdentity(p.xform); - p.xform[4] = cx; - p.xform[5] = cy; - - p.extent[0] = r; - p.extent[1] = r; - - p.radius = r; - - p.feather = nvg__maxf(1.0f, f); - - p.innerColor = icol; - p.outerColor = ocol; - - return p; -} - -NVGpaint nvgBoxGradient(NVGcontext* ctx, - float x, float y, float w, float h, float r, float f, - NVGcolor icol, NVGcolor ocol) -{ - NVGpaint p; - NVG_NOTUSED(ctx); - memset(&p, 0, sizeof(p)); - - nvgTransformIdentity(p.xform); - p.xform[4] = x+w*0.5f; - p.xform[5] = y+h*0.5f; - - p.extent[0] = w*0.5f; - p.extent[1] = h*0.5f; - - p.radius = r; - - p.feather = nvg__maxf(1.0f, f); - - p.innerColor = icol; - p.outerColor = ocol; - - return p; -} - - -NVGpaint nvgImagePattern(NVGcontext* ctx, - float cx, float cy, float w, float h, float angle, - int image, float alpha) -{ - NVGpaint p; - NVG_NOTUSED(ctx); - memset(&p, 0, sizeof(p)); - - nvgTransformRotate(p.xform, angle); - p.xform[4] = cx; - p.xform[5] = cy; - - p.extent[0] = w; - p.extent[1] = h; - - p.image = image; - - p.innerColor = p.outerColor = nvgRGBAf(1,1,1,alpha); - - return p; -} - -// Scissoring -void nvgScissor(NVGcontext* ctx, float x, float y, float w, float h) -{ - NVGstate* state = nvg__getState(ctx); - - w = nvg__maxf(0.0f, w); - h = nvg__maxf(0.0f, h); - - nvgTransformIdentity(state->scissor.xform); - state->scissor.xform[4] = x+w*0.5f; - state->scissor.xform[5] = y+h*0.5f; - nvgTransformMultiply(state->scissor.xform, state->xform); - - state->scissor.extent[0] = w*0.5f; - state->scissor.extent[1] = h*0.5f; -} - -static void nvg__isectRects(float* dst, - float ax, float ay, float aw, float ah, - float bx, float by, float bw, float bh) -{ - float minx = nvg__maxf(ax, bx); - float miny = nvg__maxf(ay, by); - float maxx = nvg__minf(ax+aw, bx+bw); - float maxy = nvg__minf(ay+ah, by+bh); - dst[0] = minx; - dst[1] = miny; - dst[2] = nvg__maxf(0.0f, maxx - minx); - dst[3] = nvg__maxf(0.0f, maxy - miny); -} - -void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h) -{ - NVGstate* state = nvg__getState(ctx); - float pxform[6], invxorm[6]; - float rect[4]; - float ex, ey, tex, tey; - - // If no previous scissor has been set, set the scissor as current scissor. - if (state->scissor.extent[0] < 0) { - nvgScissor(ctx, x, y, w, h); - return; - } - - // Transform the current scissor rect into current transform space. - // If there is difference in rotation, this will be approximation. - memcpy(pxform, state->scissor.xform, sizeof(float)*6); - ex = state->scissor.extent[0]; - ey = state->scissor.extent[1]; - nvgTransformInverse(invxorm, state->xform); - nvgTransformMultiply(pxform, invxorm); - tex = ex*nvg__absf(pxform[0]) + ey*nvg__absf(pxform[2]); - tey = ex*nvg__absf(pxform[1]) + ey*nvg__absf(pxform[3]); - - // Intersect rects. - nvg__isectRects(rect, pxform[4]-tex,pxform[5]-tey,tex*2,tey*2, x,y,w,h); - - nvgScissor(ctx, rect[0], rect[1], rect[2], rect[3]); -} - -void nvgResetScissor(NVGcontext* ctx) -{ - NVGstate* state = nvg__getState(ctx); - memset(state->scissor.xform, 0, sizeof(state->scissor.xform)); - state->scissor.extent[0] = -1.0f; - state->scissor.extent[1] = -1.0f; -} - -// Global composite operation. -void nvgGlobalCompositeOperation(NVGcontext* ctx, int op) -{ - NVGstate* state = nvg__getState(ctx); - state->compositeOperation = nvg__compositeOperationState(op); -} - -void nvgGlobalCompositeBlendFunc(NVGcontext* ctx, int sfactor, int dfactor) -{ - nvgGlobalCompositeBlendFuncSeparate(ctx, sfactor, dfactor, sfactor, dfactor); -} - -void nvgGlobalCompositeBlendFuncSeparate(NVGcontext* ctx, int srcRGB, int dstRGB, int srcAlpha, int dstAlpha) -{ - NVGcompositeOperationState op; - op.srcRGB = srcRGB; - op.dstRGB = dstRGB; - op.srcAlpha = srcAlpha; - op.dstAlpha = dstAlpha; - - NVGstate* state = nvg__getState(ctx); - state->compositeOperation = op; -} - -static int nvg__ptEquals(float x1, float y1, float x2, float y2, float tol) -{ - float dx = x2 - x1; - float dy = y2 - y1; - return dx*dx + dy*dy < tol*tol; -} - -static float nvg__distPtSeg(float x, float y, float px, float py, float qx, float qy) -{ - float pqx, pqy, dx, dy, d, t; - pqx = qx-px; - pqy = qy-py; - dx = x-px; - dy = y-py; - d = pqx*pqx + pqy*pqy; - t = pqx*dx + pqy*dy; - if (d > 0) t /= d; - if (t < 0) t = 0; - else if (t > 1) t = 1; - dx = px + t*pqx - x; - dy = py + t*pqy - y; - return dx*dx + dy*dy; -} - -static void nvg__appendCommands(NVGcontext* ctx, float* vals, int nvals) -{ - NVGstate* state = nvg__getState(ctx); - int i; - - if (ctx->ncommands+nvals > ctx->ccommands) { - float* commands; - int ccommands = ctx->ncommands+nvals + ctx->ccommands/2; - commands = (float*)realloc(ctx->commands, sizeof(float)*ccommands); - if (commands == NULL) return; - ctx->commands = commands; - ctx->ccommands = ccommands; - } - - if ((int)vals[0] != NVG_CLOSE && (int)vals[0] != NVG_WINDING) { - ctx->commandx = vals[nvals-2]; - ctx->commandy = vals[nvals-1]; - } - - // transform commands - i = 0; - while (i < nvals) { - int cmd = (int)vals[i]; - switch (cmd) { - case NVG_MOVETO: - nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]); - i += 3; - break; - case NVG_LINETO: - nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]); - i += 3; - break; - case NVG_BEZIERTO: - nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]); - nvgTransformPoint(&vals[i+3],&vals[i+4], state->xform, vals[i+3],vals[i+4]); - nvgTransformPoint(&vals[i+5],&vals[i+6], state->xform, vals[i+5],vals[i+6]); - i += 7; - break; - case NVG_CLOSE: - i++; - break; - case NVG_WINDING: - i += 2; - break; - default: - i++; - } - } - - memcpy(&ctx->commands[ctx->ncommands], vals, nvals*sizeof(float)); - - ctx->ncommands += nvals; -} - - -static void nvg__clearPathCache(NVGcontext* ctx) -{ - ctx->cache->npoints = 0; - ctx->cache->npaths = 0; -} - -static NVGpath* nvg__lastPath(NVGcontext* ctx) -{ - if (ctx->cache->npaths > 0) - return &ctx->cache->paths[ctx->cache->npaths-1]; - return NULL; -} - -static void nvg__addPath(NVGcontext* ctx) -{ - NVGpath* path; - if (ctx->cache->npaths+1 > ctx->cache->cpaths) { - NVGpath* paths; - int cpaths = ctx->cache->npaths+1 + ctx->cache->cpaths/2; - paths = (NVGpath*)realloc(ctx->cache->paths, sizeof(NVGpath)*cpaths); - if (paths == NULL) return; - ctx->cache->paths = paths; - ctx->cache->cpaths = cpaths; - } - path = &ctx->cache->paths[ctx->cache->npaths]; - memset(path, 0, sizeof(*path)); - path->first = ctx->cache->npoints; - path->winding = NVG_CCW; - - ctx->cache->npaths++; -} - -static NVGpoint* nvg__lastPoint(NVGcontext* ctx) -{ - if (ctx->cache->npoints > 0) - return &ctx->cache->points[ctx->cache->npoints-1]; - return NULL; -} - -static void nvg__addPoint(NVGcontext* ctx, float x, float y, int flags) -{ - NVGpath* path = nvg__lastPath(ctx); - NVGpoint* pt; - if (path == NULL) return; - - if (path->count > 0 && ctx->cache->npoints > 0) { - pt = nvg__lastPoint(ctx); - if (nvg__ptEquals(pt->x,pt->y, x,y, ctx->distTol)) { - pt->flags |= flags; - return; - } - } - - if (ctx->cache->npoints+1 > ctx->cache->cpoints) { - NVGpoint* points; - int cpoints = ctx->cache->npoints+1 + ctx->cache->cpoints/2; - points = (NVGpoint*)realloc(ctx->cache->points, sizeof(NVGpoint)*cpoints); - if (points == NULL) return; - ctx->cache->points = points; - ctx->cache->cpoints = cpoints; - } - - pt = &ctx->cache->points[ctx->cache->npoints]; - memset(pt, 0, sizeof(*pt)); - pt->x = x; - pt->y = y; - pt->flags = (unsigned char)flags; - - ctx->cache->npoints++; - path->count++; -} - -static void nvg__closePath(NVGcontext* ctx) -{ - NVGpath* path = nvg__lastPath(ctx); - if (path == NULL) return; - path->closed = 1; -} - -static void nvg__pathWinding(NVGcontext* ctx, int winding) -{ - NVGpath* path = nvg__lastPath(ctx); - if (path == NULL) return; - path->winding = winding; -} - -static float nvg__getAverageScale(float *t) -{ - float sx = sqrtf(t[0]*t[0] + t[2]*t[2]); - float sy = sqrtf(t[1]*t[1] + t[3]*t[3]); - return (sx + sy) * 0.5f; -} - -static NVGvertex* nvg__allocTempVerts(NVGcontext* ctx, int nverts) -{ - if (nverts > ctx->cache->cverts) { - NVGvertex* verts; - int cverts = (nverts + 0xff) & ~0xff; // Round up to prevent allocations when things change just slightly. - verts = (NVGvertex*)realloc(ctx->cache->verts, sizeof(NVGvertex)*cverts); - if (verts == NULL) return NULL; - ctx->cache->verts = verts; - ctx->cache->cverts = cverts; - } - - return ctx->cache->verts; -} - -static float nvg__triarea2(float ax, float ay, float bx, float by, float cx, float cy) -{ - float abx = bx - ax; - float aby = by - ay; - float acx = cx - ax; - float acy = cy - ay; - return acx*aby - abx*acy; -} - -static float nvg__polyArea(NVGpoint* pts, int npts) -{ - int i; - float area = 0; - for (i = 2; i < npts; i++) { - NVGpoint* a = &pts[0]; - NVGpoint* b = &pts[i-1]; - NVGpoint* c = &pts[i]; - area += nvg__triarea2(a->x,a->y, b->x,b->y, c->x,c->y); - } - return area * 0.5f; -} - -static void nvg__polyReverse(NVGpoint* pts, int npts) -{ - NVGpoint tmp; - int i = 0, j = npts-1; - while (i < j) { - tmp = pts[i]; - pts[i] = pts[j]; - pts[j] = tmp; - i++; - j--; - } -} - - -static void nvg__vset(NVGvertex* vtx, float x, float y, float u, float v) -{ - vtx->x = x; - vtx->y = y; - vtx->u = u; - vtx->v = v; -} - -static void nvg__tesselateBezier(NVGcontext* ctx, - float x1, float y1, float x2, float y2, - float x3, float y3, float x4, float y4, - int level, int type) -{ - float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234; - float dx,dy,d2,d3; - - if (level > 10) return; - - x12 = (x1+x2)*0.5f; - y12 = (y1+y2)*0.5f; - x23 = (x2+x3)*0.5f; - y23 = (y2+y3)*0.5f; - x34 = (x3+x4)*0.5f; - y34 = (y3+y4)*0.5f; - x123 = (x12+x23)*0.5f; - y123 = (y12+y23)*0.5f; - - dx = x4 - x1; - dy = y4 - y1; - d2 = nvg__absf(((x2 - x4) * dy - (y2 - y4) * dx)); - d3 = nvg__absf(((x3 - x4) * dy - (y3 - y4) * dx)); - - if ((d2 + d3)*(d2 + d3) < ctx->tessTol * (dx*dx + dy*dy)) { - nvg__addPoint(ctx, x4, y4, type); - return; - } - -/* if (nvg__absf(x1+x3-x2-x2) + nvg__absf(y1+y3-y2-y2) + nvg__absf(x2+x4-x3-x3) + nvg__absf(y2+y4-y3-y3) < ctx->tessTol) { - nvg__addPoint(ctx, x4, y4, type); - return; - }*/ - - x234 = (x23+x34)*0.5f; - y234 = (y23+y34)*0.5f; - x1234 = (x123+x234)*0.5f; - y1234 = (y123+y234)*0.5f; - - nvg__tesselateBezier(ctx, x1,y1, x12,y12, x123,y123, x1234,y1234, level+1, 0); - nvg__tesselateBezier(ctx, x1234,y1234, x234,y234, x34,y34, x4,y4, level+1, type); -} - -static void nvg__flattenPaths(NVGcontext* ctx) -{ - NVGpathCache* cache = ctx->cache; -// NVGstate* state = nvg__getState(ctx); - NVGpoint* last; - NVGpoint* p0; - NVGpoint* p1; - NVGpoint* pts; - NVGpath* path; - int i, j; - float* cp1; - float* cp2; - float* p; - float area; - - if (cache->npaths > 0) - return; - - // Flatten - i = 0; - while (i < ctx->ncommands) { - int cmd = (int)ctx->commands[i]; - switch (cmd) { - case NVG_MOVETO: - nvg__addPath(ctx); - p = &ctx->commands[i+1]; - nvg__addPoint(ctx, p[0], p[1], NVG_PT_CORNER); - i += 3; - break; - case NVG_LINETO: - p = &ctx->commands[i+1]; - nvg__addPoint(ctx, p[0], p[1], NVG_PT_CORNER); - i += 3; - break; - case NVG_BEZIERTO: - last = nvg__lastPoint(ctx); - if (last != NULL) { - cp1 = &ctx->commands[i+1]; - cp2 = &ctx->commands[i+3]; - p = &ctx->commands[i+5]; - nvg__tesselateBezier(ctx, last->x,last->y, cp1[0],cp1[1], cp2[0],cp2[1], p[0],p[1], 0, NVG_PT_CORNER); - } - i += 7; - break; - case NVG_CLOSE: - nvg__closePath(ctx); - i++; - break; - case NVG_WINDING: - nvg__pathWinding(ctx, (int)ctx->commands[i+1]); - i += 2; - break; - default: - i++; - } - } - - cache->bounds[0] = cache->bounds[1] = 1e6f; - cache->bounds[2] = cache->bounds[3] = -1e6f; - - // Calculate the direction and length of line segments. - for (j = 0; j < cache->npaths; j++) { - path = &cache->paths[j]; - pts = &cache->points[path->first]; - - // If the first and last points are the same, remove the last, mark as closed path. - p0 = &pts[path->count-1]; - p1 = &pts[0]; - if (nvg__ptEquals(p0->x,p0->y, p1->x,p1->y, ctx->distTol)) { - path->count--; - p0 = &pts[path->count-1]; - path->closed = 1; - } - - // Enforce winding. - if (path->count > 2) { - area = nvg__polyArea(pts, path->count); - if (path->winding == NVG_CCW && area < 0.0f) - nvg__polyReverse(pts, path->count); - if (path->winding == NVG_CW && area > 0.0f) - nvg__polyReverse(pts, path->count); - } - - for(i = 0; i < path->count; i++) { - // Calculate segment direction and length - p0->dx = p1->x - p0->x; - p0->dy = p1->y - p0->y; - p0->len = nvg__normalize(&p0->dx, &p0->dy); - // Update bounds - cache->bounds[0] = nvg__minf(cache->bounds[0], p0->x); - cache->bounds[1] = nvg__minf(cache->bounds[1], p0->y); - cache->bounds[2] = nvg__maxf(cache->bounds[2], p0->x); - cache->bounds[3] = nvg__maxf(cache->bounds[3], p0->y); - // Advance - p0 = p1++; - } - } -} - -static int nvg__curveDivs(float r, float arc, float tol) -{ - float da = acosf(r / (r + tol)) * 2.0f; - return nvg__maxi(2, (int)ceilf(arc / da)); -} - -static void nvg__chooseBevel(int bevel, NVGpoint* p0, NVGpoint* p1, float w, - float* x0, float* y0, float* x1, float* y1) -{ - if (bevel) { - *x0 = p1->x + p0->dy * w; - *y0 = p1->y - p0->dx * w; - *x1 = p1->x + p1->dy * w; - *y1 = p1->y - p1->dx * w; - } else { - *x0 = p1->x + p1->dmx * w; - *y0 = p1->y + p1->dmy * w; - *x1 = p1->x + p1->dmx * w; - *y1 = p1->y + p1->dmy * w; - } -} - -static NVGvertex* nvg__roundJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1, - float lw, float rw, float lu, float ru, int ncap, float fringe) -{ - int i, n; - float dlx0 = p0->dy; - float dly0 = -p0->dx; - float dlx1 = p1->dy; - float dly1 = -p1->dx; - NVG_NOTUSED(fringe); - - if (p1->flags & NVG_PT_LEFT) { - float lx0,ly0,lx1,ly1,a0,a1; - nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1); - a0 = atan2f(-dly0, -dlx0); - a1 = atan2f(-dly1, -dlx1); - if (a1 > a0) a1 -= NVG_PI*2; - - nvg__vset(dst, lx0, ly0, lu,1); dst++; - nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++; - - n = nvg__clampi((int)ceilf(((a0 - a1) / NVG_PI) * ncap), 2, ncap); - for (i = 0; i < n; i++) { - float u = i/(float)(n-1); - float a = a0 + u*(a1-a0); - float rx = p1->x + cosf(a) * rw; - float ry = p1->y + sinf(a) * rw; - nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; - nvg__vset(dst, rx, ry, ru,1); dst++; - } - - nvg__vset(dst, lx1, ly1, lu,1); dst++; - nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++; - - } else { - float rx0,ry0,rx1,ry1,a0,a1; - nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1); - a0 = atan2f(dly0, dlx0); - a1 = atan2f(dly1, dlx1); - if (a1 < a0) a1 += NVG_PI*2; - - nvg__vset(dst, p1->x + dlx0*rw, p1->y + dly0*rw, lu,1); dst++; - nvg__vset(dst, rx0, ry0, ru,1); dst++; - - n = nvg__clampi((int)ceilf(((a1 - a0) / NVG_PI) * ncap), 2, ncap); - for (i = 0; i < n; i++) { - float u = i/(float)(n-1); - float a = a0 + u*(a1-a0); - float lx = p1->x + cosf(a) * lw; - float ly = p1->y + sinf(a) * lw; - nvg__vset(dst, lx, ly, lu,1); dst++; - nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; - } - - nvg__vset(dst, p1->x + dlx1*rw, p1->y + dly1*rw, lu,1); dst++; - nvg__vset(dst, rx1, ry1, ru,1); dst++; - - } - return dst; -} - -static NVGvertex* nvg__bevelJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1, - float lw, float rw, float lu, float ru, float fringe) -{ - float rx0,ry0,rx1,ry1; - float lx0,ly0,lx1,ly1; - float dlx0 = p0->dy; - float dly0 = -p0->dx; - float dlx1 = p1->dy; - float dly1 = -p1->dx; - NVG_NOTUSED(fringe); - - if (p1->flags & NVG_PT_LEFT) { - nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1); - - nvg__vset(dst, lx0, ly0, lu,1); dst++; - nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++; - - if (p1->flags & NVG_PT_BEVEL) { - nvg__vset(dst, lx0, ly0, lu,1); dst++; - nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++; - - nvg__vset(dst, lx1, ly1, lu,1); dst++; - nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++; - } else { - rx0 = p1->x - p1->dmx * rw; - ry0 = p1->y - p1->dmy * rw; - - nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; - nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++; - - nvg__vset(dst, rx0, ry0, ru,1); dst++; - nvg__vset(dst, rx0, ry0, ru,1); dst++; - - nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; - nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++; - } - - nvg__vset(dst, lx1, ly1, lu,1); dst++; - nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++; - - } else { - nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1); - - nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++; - nvg__vset(dst, rx0, ry0, ru,1); dst++; - - if (p1->flags & NVG_PT_BEVEL) { - nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++; - nvg__vset(dst, rx0, ry0, ru,1); dst++; - - nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++; - nvg__vset(dst, rx1, ry1, ru,1); dst++; - } else { - lx0 = p1->x + p1->dmx * lw; - ly0 = p1->y + p1->dmy * lw; - - nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++; - nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; - - nvg__vset(dst, lx0, ly0, lu,1); dst++; - nvg__vset(dst, lx0, ly0, lu,1); dst++; - - nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++; - nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++; - } - - nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++; - nvg__vset(dst, rx1, ry1, ru,1); dst++; - } - - return dst; -} - -static NVGvertex* nvg__buttCapStart(NVGvertex* dst, NVGpoint* p, - float dx, float dy, float w, float d, float aa) -{ - float px = p->x - dx*d; - float py = p->y - dy*d; - float dlx = dy; - float dly = -dx; - nvg__vset(dst, px + dlx*w - dx*aa, py + dly*w - dy*aa, 0,0); dst++; - nvg__vset(dst, px - dlx*w - dx*aa, py - dly*w - dy*aa, 1,0); dst++; - nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++; - nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); dst++; - return dst; -} - -static NVGvertex* nvg__buttCapEnd(NVGvertex* dst, NVGpoint* p, - float dx, float dy, float w, float d, float aa) -{ - float px = p->x + dx*d; - float py = p->y + dy*d; - float dlx = dy; - float dly = -dx; - nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++; - nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); dst++; - nvg__vset(dst, px + dlx*w + dx*aa, py + dly*w + dy*aa, 0,0); dst++; - nvg__vset(dst, px - dlx*w + dx*aa, py - dly*w + dy*aa, 1,0); dst++; - return dst; -} - - -static NVGvertex* nvg__roundCapStart(NVGvertex* dst, NVGpoint* p, - float dx, float dy, float w, int ncap, float aa) -{ - int i; - float px = p->x; - float py = p->y; - float dlx = dy; - float dly = -dx; - NVG_NOTUSED(aa); - for (i = 0; i < ncap; i++) { - float a = i/(float)(ncap-1)*NVG_PI; - float ax = cosf(a) * w, ay = sinf(a) * w; - nvg__vset(dst, px - dlx*ax - dx*ay, py - dly*ax - dy*ay, 0,1); dst++; - nvg__vset(dst, px, py, 0.5f,1); dst++; - } - nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++; - nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); dst++; - return dst; -} - -static NVGvertex* nvg__roundCapEnd(NVGvertex* dst, NVGpoint* p, - float dx, float dy, float w, int ncap, float aa) -{ - int i; - float px = p->x; - float py = p->y; - float dlx = dy; - float dly = -dx; - NVG_NOTUSED(aa); - nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++; - nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); dst++; - for (i = 0; i < ncap; i++) { - float a = i/(float)(ncap-1)*NVG_PI; - float ax = cosf(a) * w, ay = sinf(a) * w; - nvg__vset(dst, px, py, 0.5f,1); dst++; - nvg__vset(dst, px - dlx*ax + dx*ay, py - dly*ax + dy*ay, 0,1); dst++; - } - return dst; -} - - -static void nvg__calculateJoins(NVGcontext* ctx, float w, int lineJoin, float miterLimit) -{ - NVGpathCache* cache = ctx->cache; - int i, j; - float iw = 0.0f; - - if (w > 0.0f) iw = 1.0f / w; - - // Calculate which joins needs extra vertices to append, and gather vertex count. - for (i = 0; i < cache->npaths; i++) { - NVGpath* path = &cache->paths[i]; - NVGpoint* pts = &cache->points[path->first]; - NVGpoint* p0 = &pts[path->count-1]; - NVGpoint* p1 = &pts[0]; - int nleft = 0; - - path->nbevel = 0; - - for (j = 0; j < path->count; j++) { - float dlx0, dly0, dlx1, dly1, dmr2, cross, limit; - dlx0 = p0->dy; - dly0 = -p0->dx; - dlx1 = p1->dy; - dly1 = -p1->dx; - // Calculate extrusions - p1->dmx = (dlx0 + dlx1) * 0.5f; - p1->dmy = (dly0 + dly1) * 0.5f; - dmr2 = p1->dmx*p1->dmx + p1->dmy*p1->dmy; - if (dmr2 > 0.000001f) { - float scale = 1.0f / dmr2; - if (scale > 600.0f) { - scale = 600.0f; - } - p1->dmx *= scale; - p1->dmy *= scale; - } - - // Clear flags, but keep the corner. - p1->flags = (p1->flags & NVG_PT_CORNER) ? NVG_PT_CORNER : 0; - - // Keep track of left turns. - cross = p1->dx * p0->dy - p0->dx * p1->dy; - if (cross > 0.0f) { - nleft++; - p1->flags |= NVG_PT_LEFT; - } - - // Calculate if we should use bevel or miter for inner join. - limit = nvg__maxf(1.01f, nvg__minf(p0->len, p1->len) * iw); - if ((dmr2 * limit*limit) < 1.0f) - p1->flags |= NVG_PR_INNERBEVEL; - - // Check to see if the corner needs to be beveled. - if (p1->flags & NVG_PT_CORNER) { - if ((dmr2 * miterLimit*miterLimit) < 1.0f || lineJoin == NVG_BEVEL || lineJoin == NVG_ROUND) { - p1->flags |= NVG_PT_BEVEL; - } - } - - if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) - path->nbevel++; - - p0 = p1++; - } - - path->convex = (nleft == path->count) ? 1 : 0; - } -} - - -static int nvg__expandStroke(NVGcontext* ctx, float w, int lineCap, int lineJoin, float miterLimit) -{ - NVGpathCache* cache = ctx->cache; - NVGvertex* verts; - NVGvertex* dst; - int cverts, i, j; - float aa = ctx->fringeWidth; - int ncap = nvg__curveDivs(w, NVG_PI, ctx->tessTol); // Calculate divisions per half circle. - - nvg__calculateJoins(ctx, w, lineJoin, miterLimit); - - // Calculate max vertex usage. - cverts = 0; - for (i = 0; i < cache->npaths; i++) { - NVGpath* path = &cache->paths[i]; - int loop = (path->closed == 0) ? 0 : 1; - if (lineJoin == NVG_ROUND) - cverts += (path->count + path->nbevel*(ncap+2) + 1) * 2; // plus one for loop - else - cverts += (path->count + path->nbevel*5 + 1) * 2; // plus one for loop - if (loop == 0) { - // space for caps - if (lineCap == NVG_ROUND) { - cverts += (ncap*2 + 2)*2; - } else { - cverts += (3+3)*2; - } - } - } - - verts = nvg__allocTempVerts(ctx, cverts); - if (verts == NULL) return 0; - - for (i = 0; i < cache->npaths; i++) { - NVGpath* path = &cache->paths[i]; - NVGpoint* pts = &cache->points[path->first]; - NVGpoint* p0; - NVGpoint* p1; - int s, e, loop; - float dx, dy; - - path->fill = 0; - path->nfill = 0; - - // Calculate fringe or stroke - loop = (path->closed == 0) ? 0 : 1; - dst = verts; - path->stroke = dst; - - if (loop) { - // Looping - p0 = &pts[path->count-1]; - p1 = &pts[0]; - s = 0; - e = path->count; - } else { - // Add cap - p0 = &pts[0]; - p1 = &pts[1]; - s = 1; - e = path->count-1; - } - - if (loop == 0) { - // Add cap - dx = p1->x - p0->x; - dy = p1->y - p0->y; - nvg__normalize(&dx, &dy); - if (lineCap == NVG_BUTT) - dst = nvg__buttCapStart(dst, p0, dx, dy, w, -aa*0.5f, aa); - else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE) - dst = nvg__buttCapStart(dst, p0, dx, dy, w, w-aa, aa); - else if (lineCap == NVG_ROUND) - dst = nvg__roundCapStart(dst, p0, dx, dy, w, ncap, aa); - } - - for (j = s; j < e; ++j) { - if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) { - if (lineJoin == NVG_ROUND) { - dst = nvg__roundJoin(dst, p0, p1, w, w, 0, 1, ncap, aa); - } else { - dst = nvg__bevelJoin(dst, p0, p1, w, w, 0, 1, aa); - } - } else { - nvg__vset(dst, p1->x + (p1->dmx * w), p1->y + (p1->dmy * w), 0,1); dst++; - nvg__vset(dst, p1->x - (p1->dmx * w), p1->y - (p1->dmy * w), 1,1); dst++; - } - p0 = p1++; - } - - if (loop) { - // Loop it - nvg__vset(dst, verts[0].x, verts[0].y, 0,1); dst++; - nvg__vset(dst, verts[1].x, verts[1].y, 1,1); dst++; - } else { - // Add cap - dx = p1->x - p0->x; - dy = p1->y - p0->y; - nvg__normalize(&dx, &dy); - if (lineCap == NVG_BUTT) - dst = nvg__buttCapEnd(dst, p1, dx, dy, w, -aa*0.5f, aa); - else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE) - dst = nvg__buttCapEnd(dst, p1, dx, dy, w, w-aa, aa); - else if (lineCap == NVG_ROUND) - dst = nvg__roundCapEnd(dst, p1, dx, dy, w, ncap, aa); - } - - path->nstroke = (int)(dst - verts); - - verts = dst; - } - - return 1; -} - -static int nvg__expandFill(NVGcontext* ctx, float w, int lineJoin, float miterLimit) -{ - NVGpathCache* cache = ctx->cache; - NVGvertex* verts; - NVGvertex* dst; - int cverts, convex, i, j; - float aa = ctx->fringeWidth; - int fringe = w > 0.0f; - - nvg__calculateJoins(ctx, w, lineJoin, miterLimit); - - // Calculate max vertex usage. - cverts = 0; - for (i = 0; i < cache->npaths; i++) { - NVGpath* path = &cache->paths[i]; - cverts += path->count + path->nbevel + 1; - if (fringe) - cverts += (path->count + path->nbevel*5 + 1) * 2; // plus one for loop - } - - verts = nvg__allocTempVerts(ctx, cverts); - if (verts == NULL) return 0; - - convex = cache->npaths == 1 && cache->paths[0].convex; - - for (i = 0; i < cache->npaths; i++) { - NVGpath* path = &cache->paths[i]; - NVGpoint* pts = &cache->points[path->first]; - NVGpoint* p0; - NVGpoint* p1; - float rw, lw, woff; - float ru, lu; - - // Calculate shape vertices. - woff = 0.5f*aa; - dst = verts; - path->fill = dst; - - if (fringe) { - // Looping - p0 = &pts[path->count-1]; - p1 = &pts[0]; - for (j = 0; j < path->count; ++j) { - if (p1->flags & NVG_PT_BEVEL) { - float dlx0 = p0->dy; - float dly0 = -p0->dx; - float dlx1 = p1->dy; - float dly1 = -p1->dx; - if (p1->flags & NVG_PT_LEFT) { - float lx = p1->x + p1->dmx * woff; - float ly = p1->y + p1->dmy * woff; - nvg__vset(dst, lx, ly, 0.5f,1); dst++; - } else { - float lx0 = p1->x + dlx0 * woff; - float ly0 = p1->y + dly0 * woff; - float lx1 = p1->x + dlx1 * woff; - float ly1 = p1->y + dly1 * woff; - nvg__vset(dst, lx0, ly0, 0.5f,1); dst++; - nvg__vset(dst, lx1, ly1, 0.5f,1); dst++; - } - } else { - nvg__vset(dst, p1->x + (p1->dmx * woff), p1->y + (p1->dmy * woff), 0.5f,1); dst++; - } - p0 = p1++; - } - } else { - for (j = 0; j < path->count; ++j) { - nvg__vset(dst, pts[j].x, pts[j].y, 0.5f,1); - dst++; - } - } - - path->nfill = (int)(dst - verts); - verts = dst; - - // Calculate fringe - if (fringe) { - lw = w + woff; - rw = w - woff; - lu = 0; - ru = 1; - dst = verts; - path->stroke = dst; - - // Create only half a fringe for convex shapes so that - // the shape can be rendered without stenciling. - if (convex) { - lw = woff; // This should generate the same vertex as fill inset above. - lu = 0.5f; // Set outline fade at middle. - } - - // Looping - p0 = &pts[path->count-1]; - p1 = &pts[0]; - - for (j = 0; j < path->count; ++j) { - if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) { - dst = nvg__bevelJoin(dst, p0, p1, lw, rw, lu, ru, ctx->fringeWidth); - } else { - nvg__vset(dst, p1->x + (p1->dmx * lw), p1->y + (p1->dmy * lw), lu,1); dst++; - nvg__vset(dst, p1->x - (p1->dmx * rw), p1->y - (p1->dmy * rw), ru,1); dst++; - } - p0 = p1++; - } - - // Loop it - nvg__vset(dst, verts[0].x, verts[0].y, lu,1); dst++; - nvg__vset(dst, verts[1].x, verts[1].y, ru,1); dst++; - - path->nstroke = (int)(dst - verts); - verts = dst; - } else { - path->stroke = NULL; - path->nstroke = 0; - } - } - - return 1; -} - - -// Draw -void nvgBeginPath(NVGcontext* ctx) -{ - ctx->ncommands = 0; - nvg__clearPathCache(ctx); -} - -void nvgMoveTo(NVGcontext* ctx, float x, float y) -{ - float vals[] = { NVG_MOVETO, x, y }; - nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); -} - -void nvgLineTo(NVGcontext* ctx, float x, float y) -{ - float vals[] = { NVG_LINETO, x, y }; - nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); -} - -void nvgBezierTo(NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y) -{ - float vals[] = { NVG_BEZIERTO, c1x, c1y, c2x, c2y, x, y }; - nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); -} - -void nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y) -{ - float x0 = ctx->commandx; - float y0 = ctx->commandy; - float vals[] = { NVG_BEZIERTO, - x0 + 2.0f/3.0f*(cx - x0), y0 + 2.0f/3.0f*(cy - y0), - x + 2.0f/3.0f*(cx - x), y + 2.0f/3.0f*(cy - y), - x, y }; - nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); -} - -void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius) -{ - float x0 = ctx->commandx; - float y0 = ctx->commandy; - float dx0,dy0, dx1,dy1, a, d, cx,cy, a0,a1; - int dir; - - if (ctx->ncommands == 0) { - return; - } - - // Handle degenerate cases. - if (nvg__ptEquals(x0,y0, x1,y1, ctx->distTol) || - nvg__ptEquals(x1,y1, x2,y2, ctx->distTol) || - nvg__distPtSeg(x1,y1, x0,y0, x2,y2) < ctx->distTol*ctx->distTol || - radius < ctx->distTol) { - nvgLineTo(ctx, x1,y1); - return; - } - - // Calculate tangential circle to lines (x0,y0)-(x1,y1) and (x1,y1)-(x2,y2). - dx0 = x0-x1; - dy0 = y0-y1; - dx1 = x2-x1; - dy1 = y2-y1; - nvg__normalize(&dx0,&dy0); - nvg__normalize(&dx1,&dy1); - a = nvg__acosf(dx0*dx1 + dy0*dy1); - d = radius / nvg__tanf(a/2.0f); - -// printf("a=%f° d=%f\n", a/NVG_PI*180.0f, d); - - if (d > 10000.0f) { - nvgLineTo(ctx, x1,y1); - return; - } - - if (nvg__cross(dx0,dy0, dx1,dy1) > 0.0f) { - cx = x1 + dx0*d + dy0*radius; - cy = y1 + dy0*d + -dx0*radius; - a0 = nvg__atan2f(dx0, -dy0); - a1 = nvg__atan2f(-dx1, dy1); - dir = NVG_CW; -// printf("CW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f); - } else { - cx = x1 + dx0*d + -dy0*radius; - cy = y1 + dy0*d + dx0*radius; - a0 = nvg__atan2f(-dx0, dy0); - a1 = nvg__atan2f(dx1, -dy1); - dir = NVG_CCW; -// printf("CCW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f); - } - - nvgArc(ctx, cx, cy, radius, a0, a1, dir); -} - -void nvgClosePath(NVGcontext* ctx) -{ - float vals[] = { NVG_CLOSE }; - nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); -} - -void nvgPathWinding(NVGcontext* ctx, int dir) -{ - float vals[] = { NVG_WINDING, (float)dir }; - nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); -} - -void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir) -{ - float a = 0, da = 0, hda = 0, kappa = 0; - float dx = 0, dy = 0, x = 0, y = 0, tanx = 0, tany = 0; - float px = 0, py = 0, ptanx = 0, ptany = 0; - float vals[3 + 5*7 + 100]; - int i, ndivs, nvals; - int move = ctx->ncommands > 0 ? NVG_LINETO : NVG_MOVETO; - - // Clamp angles - da = a1 - a0; - if (dir == NVG_CW) { - if (nvg__absf(da) >= NVG_PI*2) { - da = NVG_PI*2; - } else { - while (da < 0.0f) da += NVG_PI*2; - } - } else { - if (nvg__absf(da) >= NVG_PI*2) { - da = -NVG_PI*2; - } else { - while (da > 0.0f) da -= NVG_PI*2; - } - } - - // Split arc into max 90 degree segments. - ndivs = nvg__maxi(1, nvg__mini((int)(nvg__absf(da) / (NVG_PI*0.5f) + 0.5f), 5)); - hda = (da / (float)ndivs) / 2.0f; - kappa = nvg__absf(4.0f / 3.0f * (1.0f - nvg__cosf(hda)) / nvg__sinf(hda)); - - if (dir == NVG_CCW) - kappa = -kappa; - - nvals = 0; - for (i = 0; i <= ndivs; i++) { - a = a0 + da * (i/(float)ndivs); - dx = nvg__cosf(a); - dy = nvg__sinf(a); - x = cx + dx*r; - y = cy + dy*r; - tanx = -dy*r*kappa; - tany = dx*r*kappa; - - if (i == 0) { - vals[nvals++] = (float)move; - vals[nvals++] = x; - vals[nvals++] = y; - } else { - vals[nvals++] = NVG_BEZIERTO; - vals[nvals++] = px+ptanx; - vals[nvals++] = py+ptany; - vals[nvals++] = x-tanx; - vals[nvals++] = y-tany; - vals[nvals++] = x; - vals[nvals++] = y; - } - px = x; - py = y; - ptanx = tanx; - ptany = tany; - } - - nvg__appendCommands(ctx, vals, nvals); -} - -void nvgRect(NVGcontext* ctx, float x, float y, float w, float h) -{ - float vals[] = { - NVG_MOVETO, x,y, - NVG_LINETO, x,y+h, - NVG_LINETO, x+w,y+h, - NVG_LINETO, x+w,y, - NVG_CLOSE - }; - nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); -} - -void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r) -{ - nvgRoundedRectVarying(ctx, x, y, w, h, r, r, r, r); -} - -void nvgRoundedRectVarying(NVGcontext* ctx, float x, float y, float w, float h, float radTopLeft, float radTopRight, float radBottomRight, float radBottomLeft) -{ - if(radTopLeft < 0.1f && radTopRight < 0.1f && radBottomRight < 0.1f && radBottomLeft < 0.1f) { - nvgRect(ctx, x, y, w, h); - return; - } else { - float halfw = nvg__absf(w)*0.5f; - float halfh = nvg__absf(h)*0.5f; - float rxBL = nvg__minf(radBottomLeft, halfw) * nvg__signf(w), ryBL = nvg__minf(radBottomLeft, halfh) * nvg__signf(h); - float rxBR = nvg__minf(radBottomRight, halfw) * nvg__signf(w), ryBR = nvg__minf(radBottomRight, halfh) * nvg__signf(h); - float rxTR = nvg__minf(radTopRight, halfw) * nvg__signf(w), ryTR = nvg__minf(radTopRight, halfh) * nvg__signf(h); - float rxTL = nvg__minf(radTopLeft, halfw) * nvg__signf(w), ryTL = nvg__minf(radTopLeft, halfh) * nvg__signf(h); - float vals[] = { - NVG_MOVETO, x, y + ryTL, - NVG_LINETO, x, y + h - ryBL, - NVG_BEZIERTO, x, y + h - ryBL*(1 - NVG_KAPPA90), x + rxBL*(1 - NVG_KAPPA90), y + h, x + rxBL, y + h, - NVG_LINETO, x + w - rxBR, y + h, - NVG_BEZIERTO, x + w - rxBR*(1 - NVG_KAPPA90), y + h, x + w, y + h - ryBR*(1 - NVG_KAPPA90), x + w, y + h - ryBR, - NVG_LINETO, x + w, y + ryTR, - NVG_BEZIERTO, x + w, y + ryTR*(1 - NVG_KAPPA90), x + w - rxTR*(1 - NVG_KAPPA90), y, x + w - rxTR, y, - NVG_LINETO, x + rxTL, y, - NVG_BEZIERTO, x + rxTL*(1 - NVG_KAPPA90), y, x, y + ryTL*(1 - NVG_KAPPA90), x, y + ryTL, - NVG_CLOSE - }; - nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); - } -} - -void nvgEllipse(NVGcontext* ctx, float cx, float cy, float rx, float ry) -{ - float vals[] = { - NVG_MOVETO, cx-rx, cy, - NVG_BEZIERTO, cx-rx, cy+ry*NVG_KAPPA90, cx-rx*NVG_KAPPA90, cy+ry, cx, cy+ry, - NVG_BEZIERTO, cx+rx*NVG_KAPPA90, cy+ry, cx+rx, cy+ry*NVG_KAPPA90, cx+rx, cy, - NVG_BEZIERTO, cx+rx, cy-ry*NVG_KAPPA90, cx+rx*NVG_KAPPA90, cy-ry, cx, cy-ry, - NVG_BEZIERTO, cx-rx*NVG_KAPPA90, cy-ry, cx-rx, cy-ry*NVG_KAPPA90, cx-rx, cy, - NVG_CLOSE - }; - nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals)); -} - -void nvgCircle(NVGcontext* ctx, float cx, float cy, float r) -{ - nvgEllipse(ctx, cx,cy, r,r); -} - -void nvgDebugDumpPathCache(NVGcontext* ctx) -{ - const NVGpath* path; - int i, j; - - printf("Dumping %d cached paths\n", ctx->cache->npaths); - for (i = 0; i < ctx->cache->npaths; i++) { - path = &ctx->cache->paths[i]; - printf(" - Path %d\n", i); - if (path->nfill) { - printf(" - fill: %d\n", path->nfill); - for (j = 0; j < path->nfill; j++) - printf("%f\t%f\n", path->fill[j].x, path->fill[j].y); - } - if (path->nstroke) { - printf(" - stroke: %d\n", path->nstroke); - for (j = 0; j < path->nstroke; j++) - printf("%f\t%f\n", path->stroke[j].x, path->stroke[j].y); - } - } -} - -void nvgFill(NVGcontext* ctx) -{ - NVGstate* state = nvg__getState(ctx); - const NVGpath* path; - NVGpaint fillPaint = state->fill; - int i; - - nvg__flattenPaths(ctx); - if (ctx->params.edgeAntiAlias) - nvg__expandFill(ctx, ctx->fringeWidth, NVG_MITER, 2.4f); - else - nvg__expandFill(ctx, 0.0f, NVG_MITER, 2.4f); - - // Apply global alpha - fillPaint.innerColor.a *= state->alpha; - fillPaint.outerColor.a *= state->alpha; - - ctx->params.renderFill(ctx->params.userPtr, &fillPaint, &state->scissor, ctx->fringeWidth, - ctx->cache->bounds, ctx->cache->paths, ctx->cache->npaths); - - // Count triangles - for (i = 0; i < ctx->cache->npaths; i++) { - path = &ctx->cache->paths[i]; - ctx->fillTriCount += path->nfill-2; - ctx->fillTriCount += path->nstroke-2; - ctx->drawCallCount += 2; - } -} - -void nvgStroke(NVGcontext* ctx) -{ - NVGstate* state = nvg__getState(ctx); - float scale = nvg__getAverageScale(state->xform); - float strokeWidth = nvg__clampf(state->strokeWidth * scale, 0.0f, 200.0f); - NVGpaint strokePaint = state->stroke; - const NVGpath* path; - int i; - - if (strokeWidth < ctx->fringeWidth) { - // If the stroke width is less than pixel size, use alpha to emulate coverage. - // Since coverage is area, scale by alpha*alpha. - float alpha = nvg__clampf(strokeWidth / ctx->fringeWidth, 0.0f, 1.0f); - strokePaint.innerColor.a *= alpha*alpha; - strokePaint.outerColor.a *= alpha*alpha; - strokeWidth = ctx->fringeWidth; - } - - // Apply global alpha - strokePaint.innerColor.a *= state->alpha; - strokePaint.outerColor.a *= state->alpha; - - nvg__flattenPaths(ctx); - - if (ctx->params.edgeAntiAlias) - nvg__expandStroke(ctx, strokeWidth*0.5f + ctx->fringeWidth*0.5f, state->lineCap, state->lineJoin, state->miterLimit); - else - nvg__expandStroke(ctx, strokeWidth*0.5f, state->lineCap, state->lineJoin, state->miterLimit); - - ctx->params.renderStroke(ctx->params.userPtr, &strokePaint, &state->scissor, ctx->fringeWidth, - strokeWidth, ctx->cache->paths, ctx->cache->npaths); - - // Count triangles - for (i = 0; i < ctx->cache->npaths; i++) { - path = &ctx->cache->paths[i]; - ctx->strokeTriCount += path->nstroke-2; - ctx->drawCallCount++; - } -} - -// Add fonts -int nvgCreateFont(NVGcontext* ctx, const char* name, const char* path) -{ - return fonsAddFont(ctx->fs, name, path); -} - -int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData) -{ - return fonsAddFontMem(ctx->fs, name, data, ndata, freeData); -} - -int nvgFindFont(NVGcontext* ctx, const char* name) -{ - if (name == NULL) return -1; - return fonsGetFontByName(ctx->fs, name); -} - - -int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont) -{ - if(baseFont == -1 || fallbackFont == -1) return 0; - return fonsAddFallbackFont(ctx->fs, baseFont, fallbackFont); -} - -int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont) -{ - return nvgAddFallbackFontId(ctx, nvgFindFont(ctx, baseFont), nvgFindFont(ctx, fallbackFont)); -} - -// State setting -void nvgFontSize(NVGcontext* ctx, float size) -{ - NVGstate* state = nvg__getState(ctx); - state->fontSize = size; -} - -void nvgFontBlur(NVGcontext* ctx, float blur) -{ - NVGstate* state = nvg__getState(ctx); - state->fontBlur = blur; -} - -void nvgTextLetterSpacing(NVGcontext* ctx, float spacing) -{ - NVGstate* state = nvg__getState(ctx); - state->letterSpacing = spacing; -} - -void nvgTextLineHeight(NVGcontext* ctx, float lineHeight) -{ - NVGstate* state = nvg__getState(ctx); - state->lineHeight = lineHeight; -} - -void nvgTextAlign(NVGcontext* ctx, int align) -{ - NVGstate* state = nvg__getState(ctx); - state->textAlign = align; -} - -void nvgFontFaceId(NVGcontext* ctx, int font) -{ - NVGstate* state = nvg__getState(ctx); - state->fontId = font; -} - -void nvgFontFace(NVGcontext* ctx, const char* font) -{ - NVGstate* state = nvg__getState(ctx); - state->fontId = fonsGetFontByName(ctx->fs, font); -} - -static float nvg__quantize(float a, float d) -{ - return ((int)(a / d + 0.5f)) * d; -} - -static float nvg__getFontScale(NVGstate* state) -{ - return nvg__minf(nvg__quantize(nvg__getAverageScale(state->xform), 0.01f), 4.0f); -} - -static void nvg__flushTextTexture(NVGcontext* ctx) -{ - int dirty[4]; - - if (fonsValidateTexture(ctx->fs, dirty)) { - int fontImage = ctx->fontImages[ctx->fontImageIdx]; - // Update texture - if (fontImage != 0) { - int iw, ih; - const unsigned char* data = fonsGetTextureData(ctx->fs, &iw, &ih); - int x = dirty[0]; - int y = dirty[1]; - int w = dirty[2] - dirty[0]; - int h = dirty[3] - dirty[1]; - ctx->params.renderUpdateTexture(ctx->params.userPtr, fontImage, x,y, w,h, data); - } - } -} - -static int nvg__allocTextAtlas(NVGcontext* ctx) -{ - int iw, ih; - nvg__flushTextTexture(ctx); - if (ctx->fontImageIdx >= NVG_MAX_FONTIMAGES-1) - return 0; - // if next fontImage already have a texture - if (ctx->fontImages[ctx->fontImageIdx+1] != 0) - nvgImageSize(ctx, ctx->fontImages[ctx->fontImageIdx+1], &iw, &ih); - else { // calculate the new font image size and create it. - nvgImageSize(ctx, ctx->fontImages[ctx->fontImageIdx], &iw, &ih); - if (iw > ih) - ih *= 2; - else - iw *= 2; - if (iw > NVG_MAX_FONTIMAGE_SIZE || ih > NVG_MAX_FONTIMAGE_SIZE) - iw = ih = NVG_MAX_FONTIMAGE_SIZE; - ctx->fontImages[ctx->fontImageIdx+1] = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, iw, ih, 0, NULL); - } - ++ctx->fontImageIdx; - fonsResetAtlas(ctx->fs, iw, ih); - return 1; -} - -static void nvg__renderText(NVGcontext* ctx, NVGvertex* verts, int nverts) -{ - NVGstate* state = nvg__getState(ctx); - NVGpaint paint = state->fill; - - // Render triangles. - paint.image = ctx->fontImages[ctx->fontImageIdx]; - - // Apply global alpha - paint.innerColor.a *= state->alpha; - paint.outerColor.a *= state->alpha; - - ctx->params.renderTriangles(ctx->params.userPtr, &paint, &state->scissor, verts, nverts); - - ctx->drawCallCount++; - ctx->textTriCount += nverts/3; -} - -float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char* end) -{ - NVGstate* state = nvg__getState(ctx); - FONStextIter iter, prevIter; - FONSquad q; - NVGvertex* verts; - float scale = nvg__getFontScale(state) * ctx->devicePxRatio; - float invscale = 1.0f / scale; - int cverts = 0; - int nverts = 0; - - if (end == NULL) - end = string + strlen(string); - - if (state->fontId == FONS_INVALID) return x; - - fonsSetSize(ctx->fs, state->fontSize*scale); - fonsSetSpacing(ctx->fs, state->letterSpacing*scale); - fonsSetBlur(ctx->fs, state->fontBlur*scale); - fonsSetAlign(ctx->fs, state->textAlign); - fonsSetFont(ctx->fs, state->fontId); - - cverts = nvg__maxi(2, (int)(end - string)) * 6; // conservative estimate. - verts = nvg__allocTempVerts(ctx, cverts); - if (verts == NULL) return x; - - fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end); - prevIter = iter; - while (fonsTextIterNext(ctx->fs, &iter, &q)) { - float c[4*2]; - if (iter.prevGlyphIndex == -1) { // can not retrieve glyph? - if (!nvg__allocTextAtlas(ctx)) - break; // no memory :( - if (nverts != 0) { - nvg__renderText(ctx, verts, nverts); - nverts = 0; - } - iter = prevIter; - fonsTextIterNext(ctx->fs, &iter, &q); // try again - if (iter.prevGlyphIndex == -1) // still can not find glyph? - break; - } - prevIter = iter; - // Transform corners. - nvgTransformPoint(&c[0],&c[1], state->xform, q.x0*invscale, q.y0*invscale); - nvgTransformPoint(&c[2],&c[3], state->xform, q.x1*invscale, q.y0*invscale); - nvgTransformPoint(&c[4],&c[5], state->xform, q.x1*invscale, q.y1*invscale); - nvgTransformPoint(&c[6],&c[7], state->xform, q.x0*invscale, q.y1*invscale); - // Create triangles - if (nverts+6 <= cverts) { - nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++; - nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++; - nvg__vset(&verts[nverts], c[2], c[3], q.s1, q.t0); nverts++; - nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++; - nvg__vset(&verts[nverts], c[6], c[7], q.s0, q.t1); nverts++; - nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++; - } - } - - // TODO: add back-end bit to do this just once per frame. - nvg__flushTextTexture(ctx); - - nvg__renderText(ctx, verts, nverts); - - return iter.x; -} - -void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end) -{ - NVGstate* state = nvg__getState(ctx); - NVGtextRow rows[2]; - int nrows = 0, i; - int oldAlign = state->textAlign; - int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT); - int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE); - float lineh = 0; - - if (state->fontId == FONS_INVALID) return; - - nvgTextMetrics(ctx, NULL, NULL, &lineh); - - state->textAlign = NVG_ALIGN_LEFT | valign; - - while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) { - for (i = 0; i < nrows; i++) { - NVGtextRow* row = &rows[i]; - if (haling & NVG_ALIGN_LEFT) - nvgText(ctx, x, y, row->start, row->end); - else if (haling & NVG_ALIGN_CENTER) - nvgText(ctx, x + breakRowWidth*0.5f - row->width*0.5f, y, row->start, row->end); - else if (haling & NVG_ALIGN_RIGHT) - nvgText(ctx, x + breakRowWidth - row->width, y, row->start, row->end); - y += lineh * state->lineHeight; - } - string = rows[nrows-1].next; - } - - state->textAlign = oldAlign; -} - -int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string, const char* end, NVGglyphPosition* positions, int maxPositions) -{ - NVGstate* state = nvg__getState(ctx); - float scale = nvg__getFontScale(state) * ctx->devicePxRatio; - float invscale = 1.0f / scale; - FONStextIter iter, prevIter; - FONSquad q; - int npos = 0; - - if (state->fontId == FONS_INVALID) return 0; - - if (end == NULL) - end = string + strlen(string); - - if (string == end) - return 0; - - fonsSetSize(ctx->fs, state->fontSize*scale); - fonsSetSpacing(ctx->fs, state->letterSpacing*scale); - fonsSetBlur(ctx->fs, state->fontBlur*scale); - fonsSetAlign(ctx->fs, state->textAlign); - fonsSetFont(ctx->fs, state->fontId); - - fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end); - prevIter = iter; - while (fonsTextIterNext(ctx->fs, &iter, &q)) { - if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph? - iter = prevIter; - fonsTextIterNext(ctx->fs, &iter, &q); // try again - } - prevIter = iter; - positions[npos].str = iter.str; - positions[npos].x = iter.x * invscale; - positions[npos].minx = nvg__minf(iter.x, q.x0) * invscale; - positions[npos].maxx = nvg__maxf(iter.nextx, q.x1) * invscale; - npos++; - if (npos >= maxPositions) - break; - } - - return npos; -} - -enum NVGcodepointType { - NVG_SPACE, - NVG_NEWLINE, - NVG_CHAR, -}; - -int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, NVGtextRow* rows, int maxRows) -{ - NVGstate* state = nvg__getState(ctx); - float scale = nvg__getFontScale(state) * ctx->devicePxRatio; - float invscale = 1.0f / scale; - FONStextIter iter, prevIter; - FONSquad q; - int nrows = 0; - float rowStartX = 0; - float rowWidth = 0; - float rowMinX = 0; - float rowMaxX = 0; - const char* rowStart = NULL; - const char* rowEnd = NULL; - const char* wordStart = NULL; - float wordStartX = 0; - float wordMinX = 0; - const char* breakEnd = NULL; - float breakWidth = 0; - float breakMaxX = 0; - int type = NVG_SPACE, ptype = NVG_SPACE; - unsigned int pcodepoint = 0; - - if (maxRows == 0) return 0; - if (state->fontId == FONS_INVALID) return 0; - - if (end == NULL) - end = string + strlen(string); - - if (string == end) return 0; - - fonsSetSize(ctx->fs, state->fontSize*scale); - fonsSetSpacing(ctx->fs, state->letterSpacing*scale); - fonsSetBlur(ctx->fs, state->fontBlur*scale); - fonsSetAlign(ctx->fs, state->textAlign); - fonsSetFont(ctx->fs, state->fontId); - - breakRowWidth *= scale; - - fonsTextIterInit(ctx->fs, &iter, 0, 0, string, end); - prevIter = iter; - while (fonsTextIterNext(ctx->fs, &iter, &q)) { - if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph? - iter = prevIter; - fonsTextIterNext(ctx->fs, &iter, &q); // try again - } - prevIter = iter; - switch (iter.codepoint) { - case 9: // \t - case 11: // \v - case 12: // \f - case 32: // space - case 0x00a0: // NBSP - type = NVG_SPACE; - break; - case 10: // \n - type = pcodepoint == 13 ? NVG_SPACE : NVG_NEWLINE; - break; - case 13: // \r - type = pcodepoint == 10 ? NVG_SPACE : NVG_NEWLINE; - break; - case 0x0085: // NEL - type = NVG_NEWLINE; - break; - default: - type = NVG_CHAR; - break; - } - - if (type == NVG_NEWLINE) { - // Always handle new lines. - rows[nrows].start = rowStart != NULL ? rowStart : iter.str; - rows[nrows].end = rowEnd != NULL ? rowEnd : iter.str; - rows[nrows].width = rowWidth * invscale; - rows[nrows].minx = rowMinX * invscale; - rows[nrows].maxx = rowMaxX * invscale; - rows[nrows].next = iter.next; - nrows++; - if (nrows >= maxRows) - return nrows; - // Set null break point - breakEnd = rowStart; - breakWidth = 0.0; - breakMaxX = 0.0; - // Indicate to skip the white space at the beginning of the row. - rowStart = NULL; - rowEnd = NULL; - rowWidth = 0; - rowMinX = rowMaxX = 0; - } else { - if (rowStart == NULL) { - // Skip white space until the beginning of the line - if (type == NVG_CHAR) { - // The current char is the row so far - rowStartX = iter.x; - rowStart = iter.str; - rowEnd = iter.next; - rowWidth = iter.nextx - rowStartX; // q.x1 - rowStartX; - rowMinX = q.x0 - rowStartX; - rowMaxX = q.x1 - rowStartX; - wordStart = iter.str; - wordStartX = iter.x; - wordMinX = q.x0 - rowStartX; - // Set null break point - breakEnd = rowStart; - breakWidth = 0.0; - breakMaxX = 0.0; - } - } else { - float nextWidth = iter.nextx - rowStartX; - - // track last non-white space character - if (type == NVG_CHAR) { - rowEnd = iter.next; - rowWidth = iter.nextx - rowStartX; - rowMaxX = q.x1 - rowStartX; - } - // track last end of a word - if (ptype == NVG_CHAR && type == NVG_SPACE) { - breakEnd = iter.str; - breakWidth = rowWidth; - breakMaxX = rowMaxX; - } - // track last beginning of a word - if (ptype == NVG_SPACE && type == NVG_CHAR) { - wordStart = iter.str; - wordStartX = iter.x; - wordMinX = q.x0 - rowStartX; - } - - // Break to new line when a character is beyond break width. - if (type == NVG_CHAR && nextWidth > breakRowWidth) { - // The run length is too long, need to break to new line. - if (breakEnd == rowStart) { - // The current word is longer than the row length, just break it from here. - rows[nrows].start = rowStart; - rows[nrows].end = iter.str; - rows[nrows].width = rowWidth * invscale; - rows[nrows].minx = rowMinX * invscale; - rows[nrows].maxx = rowMaxX * invscale; - rows[nrows].next = iter.str; - nrows++; - if (nrows >= maxRows) - return nrows; - rowStartX = iter.x; - rowStart = iter.str; - rowEnd = iter.next; - rowWidth = iter.nextx - rowStartX; - rowMinX = q.x0 - rowStartX; - rowMaxX = q.x1 - rowStartX; - wordStart = iter.str; - wordStartX = iter.x; - wordMinX = q.x0 - rowStartX; - } else { - // Break the line from the end of the last word, and start new line from the beginning of the new. - rows[nrows].start = rowStart; - rows[nrows].end = breakEnd; - rows[nrows].width = breakWidth * invscale; - rows[nrows].minx = rowMinX * invscale; - rows[nrows].maxx = breakMaxX * invscale; - rows[nrows].next = wordStart; - nrows++; - if (nrows >= maxRows) - return nrows; - rowStartX = wordStartX; - rowStart = wordStart; - rowEnd = iter.next; - rowWidth = iter.nextx - rowStartX; - rowMinX = wordMinX; - rowMaxX = q.x1 - rowStartX; - // No change to the word start - } - // Set null break point - breakEnd = rowStart; - breakWidth = 0.0; - breakMaxX = 0.0; - } - } - } - - pcodepoint = iter.codepoint; - ptype = type; - } - - // Break the line from the end of the last word, and start new line from the beginning of the new. - if (rowStart != NULL) { - rows[nrows].start = rowStart; - rows[nrows].end = rowEnd; - rows[nrows].width = rowWidth * invscale; - rows[nrows].minx = rowMinX * invscale; - rows[nrows].maxx = rowMaxX * invscale; - rows[nrows].next = end; - nrows++; - } - - return nrows; -} - -float nvgTextBounds(NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds) -{ - NVGstate* state = nvg__getState(ctx); - float scale = nvg__getFontScale(state) * ctx->devicePxRatio; - float invscale = 1.0f / scale; - float width; - - if (state->fontId == FONS_INVALID) return 0; - - fonsSetSize(ctx->fs, state->fontSize*scale); - fonsSetSpacing(ctx->fs, state->letterSpacing*scale); - fonsSetBlur(ctx->fs, state->fontBlur*scale); - fonsSetAlign(ctx->fs, state->textAlign); - fonsSetFont(ctx->fs, state->fontId); - - width = fonsTextBounds(ctx->fs, x*scale, y*scale, string, end, bounds); - if (bounds != NULL) { - // Use line bounds for height. - fonsLineBounds(ctx->fs, y*scale, &bounds[1], &bounds[3]); - bounds[0] *= invscale; - bounds[1] *= invscale; - bounds[2] *= invscale; - bounds[3] *= invscale; - } - return width * invscale; -} - -void nvgTextBoxBounds(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds) -{ - NVGstate* state = nvg__getState(ctx); - NVGtextRow rows[2]; - float scale = nvg__getFontScale(state) * ctx->devicePxRatio; - float invscale = 1.0f / scale; - int nrows = 0, i; - int oldAlign = state->textAlign; - int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT); - int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE); - float lineh = 0, rminy = 0, rmaxy = 0; - float minx, miny, maxx, maxy; - - if (state->fontId == FONS_INVALID) { - if (bounds != NULL) - bounds[0] = bounds[1] = bounds[2] = bounds[3] = 0.0f; - return; - } - - nvgTextMetrics(ctx, NULL, NULL, &lineh); - - state->textAlign = NVG_ALIGN_LEFT | valign; - - minx = maxx = x; - miny = maxy = y; - - fonsSetSize(ctx->fs, state->fontSize*scale); - fonsSetSpacing(ctx->fs, state->letterSpacing*scale); - fonsSetBlur(ctx->fs, state->fontBlur*scale); - fonsSetAlign(ctx->fs, state->textAlign); - fonsSetFont(ctx->fs, state->fontId); - fonsLineBounds(ctx->fs, 0, &rminy, &rmaxy); - rminy *= invscale; - rmaxy *= invscale; - - while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) { - for (i = 0; i < nrows; i++) { - NVGtextRow* row = &rows[i]; - float rminx, rmaxx, dx = 0; - // Horizontal bounds - if (haling & NVG_ALIGN_LEFT) - dx = 0; - else if (haling & NVG_ALIGN_CENTER) - dx = breakRowWidth*0.5f - row->width*0.5f; - else if (haling & NVG_ALIGN_RIGHT) - dx = breakRowWidth - row->width; - rminx = x + row->minx + dx; - rmaxx = x + row->maxx + dx; - minx = nvg__minf(minx, rminx); - maxx = nvg__maxf(maxx, rmaxx); - // Vertical bounds. - miny = nvg__minf(miny, y + rminy); - maxy = nvg__maxf(maxy, y + rmaxy); - - y += lineh * state->lineHeight; - } - string = rows[nrows-1].next; - } - - state->textAlign = oldAlign; - - if (bounds != NULL) { - bounds[0] = minx; - bounds[1] = miny; - bounds[2] = maxx; - bounds[3] = maxy; - } -} - -void nvgTextMetrics(NVGcontext* ctx, float* ascender, float* descender, float* lineh) -{ - NVGstate* state = nvg__getState(ctx); - float scale = nvg__getFontScale(state) * ctx->devicePxRatio; - float invscale = 1.0f / scale; - - if (state->fontId == FONS_INVALID) return; - - fonsSetSize(ctx->fs, state->fontSize*scale); - fonsSetSpacing(ctx->fs, state->letterSpacing*scale); - fonsSetBlur(ctx->fs, state->fontBlur*scale); - fonsSetAlign(ctx->fs, state->textAlign); - fonsSetFont(ctx->fs, state->fontId); - - fonsVertMetrics(ctx->fs, ascender, descender, lineh); - if (ascender != NULL) - *ascender *= invscale; - if (descender != NULL) - *descender *= invscale; - if (lineh != NULL) - *lineh *= invscale; -} -// vim: ft=c nu noet ts=4 diff --git a/third_party/nanovg/nanovg.h b/third_party/nanovg/nanovg.h deleted file mode 100644 index bb0d3417a2..0000000000 --- a/third_party/nanovg/nanovg.h +++ /dev/null @@ -1,681 +0,0 @@ -// -// Copyright (c) 2013 Mikko Mononen memon@inside.org -// -// This software is provided 'as-is', without any express or implied -// warranty. In no event will the authors be held liable for any damages -// arising from the use of this software. -// Permission is granted to anyone to use this software for any purpose, -// including commercial applications, and to alter it and redistribute it -// freely, subject to the following restrictions: -// 1. The origin of this software must not be misrepresented; you must not -// claim that you wrote the original software. If you use this software -// in a product, an acknowledgment in the product documentation would be -// appreciated but is not required. -// 2. Altered source versions must be plainly marked as such, and must not be -// misrepresented as being the original software. -// 3. This notice may not be removed or altered from any source distribution. -// - -#ifndef NANOVG_H -#define NANOVG_H - -#ifdef __cplusplus -extern "C" { -#endif - -#define NVG_PI 3.14159265358979323846264338327f - -#ifdef _MSC_VER -#pragma warning(push) -#pragma warning(disable: 4201) // nonstandard extension used : nameless struct/union -#endif - -typedef struct NVGcontext NVGcontext; - -struct NVGcolor { - union { - float rgba[4]; - struct { - float r,g,b,a; - }; - }; -}; -typedef struct NVGcolor NVGcolor; - -struct NVGpaint { - float xform[6]; - float extent[2]; - float radius; - float feather; - NVGcolor innerColor; - NVGcolor outerColor; - int image; -}; -typedef struct NVGpaint NVGpaint; - -enum NVGwinding { - NVG_CCW = 1, // Winding for solid shapes - NVG_CW = 2, // Winding for holes -}; - -enum NVGsolidity { - NVG_SOLID = 1, // CCW - NVG_HOLE = 2, // CW -}; - -enum NVGlineCap { - NVG_BUTT, - NVG_ROUND, - NVG_SQUARE, - NVG_BEVEL, - NVG_MITER, -}; - -enum NVGalign { - // Horizontal align - NVG_ALIGN_LEFT = 1<<0, // Default, align text horizontally to left. - NVG_ALIGN_CENTER = 1<<1, // Align text horizontally to center. - NVG_ALIGN_RIGHT = 1<<2, // Align text horizontally to right. - // Vertical align - NVG_ALIGN_TOP = 1<<3, // Align text vertically to top. - NVG_ALIGN_MIDDLE = 1<<4, // Align text vertically to middle. - NVG_ALIGN_BOTTOM = 1<<5, // Align text vertically to bottom. - NVG_ALIGN_BASELINE = 1<<6, // Default, align text vertically to baseline. -}; - -enum NVGblendFactor { - NVG_ZERO = 1<<0, - NVG_ONE = 1<<1, - NVG_SRC_COLOR = 1<<2, - NVG_ONE_MINUS_SRC_COLOR = 1<<3, - NVG_DST_COLOR = 1<<4, - NVG_ONE_MINUS_DST_COLOR = 1<<5, - NVG_SRC_ALPHA = 1<<6, - NVG_ONE_MINUS_SRC_ALPHA = 1<<7, - NVG_DST_ALPHA = 1<<8, - NVG_ONE_MINUS_DST_ALPHA = 1<<9, - NVG_SRC_ALPHA_SATURATE = 1<<10, -}; - -enum NVGcompositeOperation { - NVG_SOURCE_OVER, - NVG_SOURCE_IN, - NVG_SOURCE_OUT, - NVG_ATOP, - NVG_DESTINATION_OVER, - NVG_DESTINATION_IN, - NVG_DESTINATION_OUT, - NVG_DESTINATION_ATOP, - NVG_LIGHTER, - NVG_COPY, - NVG_XOR, -}; - -struct NVGcompositeOperationState { - int srcRGB; - int dstRGB; - int srcAlpha; - int dstAlpha; -}; -typedef struct NVGcompositeOperationState NVGcompositeOperationState; - -struct NVGglyphPosition { - const char* str; // Position of the glyph in the input string. - float x; // The x-coordinate of the logical glyph position. - float minx, maxx; // The bounds of the glyph shape. -}; -typedef struct NVGglyphPosition NVGglyphPosition; - -struct NVGtextRow { - const char* start; // Pointer to the input text where the row starts. - const char* end; // Pointer to the input text where the row ends (one past the last character). - const char* next; // Pointer to the beginning of the next row. - float width; // Logical width of the row. - float minx, maxx; // Actual bounds of the row. Logical with and bounds can differ because of kerning and some parts over extending. -}; -typedef struct NVGtextRow NVGtextRow; - -enum NVGimageFlags { - NVG_IMAGE_GENERATE_MIPMAPS = 1<<0, // Generate mipmaps during creation of the image. - NVG_IMAGE_REPEATX = 1<<1, // Repeat image in X direction. - NVG_IMAGE_REPEATY = 1<<2, // Repeat image in Y direction. - NVG_IMAGE_FLIPY = 1<<3, // Flips (inverses) image in Y direction when rendered. - NVG_IMAGE_PREMULTIPLIED = 1<<4, // Image data has premultiplied alpha. -}; - -// Begin drawing a new frame -// Calls to nanovg drawing API should be wrapped in nvgBeginFrame() & nvgEndFrame() -// nvgBeginFrame() defines the size of the window to render to in relation currently -// set viewport (i.e. glViewport on GL backends). Device pixel ration allows to -// control the rendering on Hi-DPI devices. -// For example, GLFW returns two dimension for an opened window: window size and -// frame buffer size. In that case you would set windowWidth/Height to the window size -// devicePixelRatio to: frameBufferWidth / windowWidth. -void nvgBeginFrame(NVGcontext* ctx, int windowWidth, int windowHeight, float devicePixelRatio); - -// Cancels drawing the current frame. -void nvgCancelFrame(NVGcontext* ctx); - -// Ends drawing flushing remaining render state. -void nvgEndFrame(NVGcontext* ctx); - -// -// Composite operation -// -// The composite operations in NanoVG are modeled after HTML Canvas API, and -// the blend func is based on OpenGL (see corresponding manuals for more info). -// The colors in the blending state have premultiplied alpha. - -// Sets the composite operation. The op parameter should be one of NVGcompositeOperation. -void nvgGlobalCompositeOperation(NVGcontext* ctx, int op); - -// Sets the composite operation with custom pixel arithmetic. The parameters should be one of NVGblendFactor. -void nvgGlobalCompositeBlendFunc(NVGcontext* ctx, int sfactor, int dfactor); - -// Sets the composite operation with custom pixel arithmetic for RGB and alpha components separately. The parameters should be one of NVGblendFactor. -void nvgGlobalCompositeBlendFuncSeparate(NVGcontext* ctx, int srcRGB, int dstRGB, int srcAlpha, int dstAlpha); - -// -// Color utils -// -// Colors in NanoVG are stored as unsigned ints in ABGR format. - -// Returns a color value from red, green, blue values. Alpha will be set to 255 (1.0f). -NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b); - -// Returns a color value from red, green, blue values. Alpha will be set to 1.0f. -NVGcolor nvgRGBf(float r, float g, float b); - - -// Returns a color value from red, green, blue and alpha values. -NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a); - -// Returns a color value from red, green, blue and alpha values. -NVGcolor nvgRGBAf(float r, float g, float b, float a); - - -// Linearly interpolates from color c0 to c1, and returns resulting color value. -NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u); - -// Sets transparency of a color value. -NVGcolor nvgTransRGBA(NVGcolor c0, unsigned char a); - -// Sets transparency of a color value. -NVGcolor nvgTransRGBAf(NVGcolor c0, float a); - -// Returns color value specified by hue, saturation and lightness. -// HSL values are all in range [0..1], alpha will be set to 255. -NVGcolor nvgHSL(float h, float s, float l); - -// Returns color value specified by hue, saturation and lightness and alpha. -// HSL values are all in range [0..1], alpha in range [0..255] -NVGcolor nvgHSLA(float h, float s, float l, unsigned char a); - -// -// State Handling -// -// NanoVG contains state which represents how paths will be rendered. -// The state contains transform, fill and stroke styles, text and font styles, -// and scissor clipping. - -// Pushes and saves the current render state into a state stack. -// A matching nvgRestore() must be used to restore the state. -void nvgSave(NVGcontext* ctx); - -// Pops and restores current render state. -void nvgRestore(NVGcontext* ctx); - -// Resets current render state to default values. Does not affect the render state stack. -void nvgReset(NVGcontext* ctx); - -// -// Render styles -// -// Fill and stroke render style can be either a solid color or a paint which is a gradient or a pattern. -// Solid color is simply defined as a color value, different kinds of paints can be created -// using nvgLinearGradient(), nvgBoxGradient(), nvgRadialGradient() and nvgImagePattern(). -// -// Current render style can be saved and restored using nvgSave() and nvgRestore(). - -// Sets current stroke style to a solid color. -void nvgStrokeColor(NVGcontext* ctx, NVGcolor color); - -// Sets current stroke style to a paint, which can be a one of the gradients or a pattern. -void nvgStrokePaint(NVGcontext* ctx, NVGpaint paint); - -// Sets current fill style to a solid color. -void nvgFillColor(NVGcontext* ctx, NVGcolor color); - -// Sets current fill style to a paint, which can be a one of the gradients or a pattern. -void nvgFillPaint(NVGcontext* ctx, NVGpaint paint); - -// Sets the miter limit of the stroke style. -// Miter limit controls when a sharp corner is beveled. -void nvgMiterLimit(NVGcontext* ctx, float limit); - -// Sets the stroke width of the stroke style. -void nvgStrokeWidth(NVGcontext* ctx, float size); - -// Sets how the end of the line (cap) is drawn, -// Can be one of: NVG_BUTT (default), NVG_ROUND, NVG_SQUARE. -void nvgLineCap(NVGcontext* ctx, int cap); - -// Sets how sharp path corners are drawn. -// Can be one of NVG_MITER (default), NVG_ROUND, NVG_BEVEL. -void nvgLineJoin(NVGcontext* ctx, int join); - -// Sets the transparency applied to all rendered shapes. -// Already transparent paths will get proportionally more transparent as well. -void nvgGlobalAlpha(NVGcontext* ctx, float alpha); - -// -// Transforms -// -// The paths, gradients, patterns and scissor region are transformed by an transformation -// matrix at the time when they are passed to the API. -// The current transformation matrix is a affine matrix: -// [sx kx tx] -// [ky sy ty] -// [ 0 0 1] -// Where: sx,sy define scaling, kx,ky skewing, and tx,ty translation. -// The last row is assumed to be 0,0,1 and is not stored. -// -// Apart from nvgResetTransform(), each transformation function first creates -// specific transformation matrix and pre-multiplies the current transformation by it. -// -// Current coordinate system (transformation) can be saved and restored using nvgSave() and nvgRestore(). - -// Resets current transform to a identity matrix. -void nvgResetTransform(NVGcontext* ctx); - -// Premultiplies current coordinate system by specified matrix. -// The parameters are interpreted as matrix as follows: -// [a c e] -// [b d f] -// [0 0 1] -void nvgTransform(NVGcontext* ctx, float a, float b, float c, float d, float e, float f); - -// Translates current coordinate system. -void nvgTranslate(NVGcontext* ctx, float x, float y); - -// Rotates current coordinate system. Angle is specified in radians. -void nvgRotate(NVGcontext* ctx, float angle); - -// Skews the current coordinate system along X axis. Angle is specified in radians. -void nvgSkewX(NVGcontext* ctx, float angle); - -// Skews the current coordinate system along Y axis. Angle is specified in radians. -void nvgSkewY(NVGcontext* ctx, float angle); - -// Scales the current coordinate system. -void nvgScale(NVGcontext* ctx, float x, float y); - -// Stores the top part (a-f) of the current transformation matrix in to the specified buffer. -// [a c e] -// [b d f] -// [0 0 1] -// There should be space for 6 floats in the return buffer for the values a-f. -void nvgCurrentTransform(NVGcontext* ctx, float* xform); - - -// The following functions can be used to make calculations on 2x3 transformation matrices. -// A 2x3 matrix is represented as float[6]. - -// Sets the transform to identity matrix. -void nvgTransformIdentity(float* dst); - -// Sets the transform to translation matrix matrix. -void nvgTransformTranslate(float* dst, float tx, float ty); - -// Sets the transform to scale matrix. -void nvgTransformScale(float* dst, float sx, float sy); - -// Sets the transform to rotate matrix. Angle is specified in radians. -void nvgTransformRotate(float* dst, float a); - -// Sets the transform to skew-x matrix. Angle is specified in radians. -void nvgTransformSkewX(float* dst, float a); - -// Sets the transform to skew-y matrix. Angle is specified in radians. -void nvgTransformSkewY(float* dst, float a); - -// Sets the transform to the result of multiplication of two transforms, of A = A*B. -void nvgTransformMultiply(float* dst, const float* src); - -// Sets the transform to the result of multiplication of two transforms, of A = B*A. -void nvgTransformPremultiply(float* dst, const float* src); - -// Sets the destination to inverse of specified transform. -// Returns 1 if the inverse could be calculated, else 0. -int nvgTransformInverse(float* dst, const float* src); - -// Transform a point by given transform. -void nvgTransformPoint(float* dstx, float* dsty, const float* xform, float srcx, float srcy); - -// Converts degrees to radians and vice versa. -float nvgDegToRad(float deg); -float nvgRadToDeg(float rad); - -// -// Images -// -// NanoVG allows you to load jpg, png, psd, tga, pic and gif files to be used for rendering. -// In addition you can upload your own image. The image loading is provided by stb_image. -// The parameter imageFlags is combination of flags defined in NVGimageFlags. - -// Creates image by loading it from the disk from specified file name. -// Returns handle to the image. -int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags); - -// Creates image by loading it from the specified chunk of memory. -// Returns handle to the image. -int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, unsigned char* data, int ndata); - -// Creates image from specified image data. -// Returns handle to the image. -int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data); - -// Updates image data specified by image handle. -void nvgUpdateImage(NVGcontext* ctx, int image, const unsigned char* data); - -// Returns the dimensions of a created image. -void nvgImageSize(NVGcontext* ctx, int image, int* w, int* h); - -// Deletes created image. -void nvgDeleteImage(NVGcontext* ctx, int image); - -// -// Paints -// -// NanoVG supports four types of paints: linear gradient, box gradient, radial gradient and image pattern. -// These can be used as paints for strokes and fills. - -// Creates and returns a linear gradient. Parameters (sx,sy)-(ex,ey) specify the start and end coordinates -// of the linear gradient, icol specifies the start color and ocol the end color. -// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). -NVGpaint nvgLinearGradient(NVGcontext* ctx, float sx, float sy, float ex, float ey, - NVGcolor icol, NVGcolor ocol); - -// Creates and returns a box gradient. Box gradient is a feathered rounded rectangle, it is useful for rendering -// drop shadows or highlights for boxes. Parameters (x,y) define the top-left corner of the rectangle, -// (w,h) define the size of the rectangle, r defines the corner radius, and f feather. Feather defines how blurry -// the border of the rectangle is. Parameter icol specifies the inner color and ocol the outer color of the gradient. -// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). -NVGpaint nvgBoxGradient(NVGcontext* ctx, float x, float y, float w, float h, - float r, float f, NVGcolor icol, NVGcolor ocol); - -// Creates and returns a radial gradient. Parameters (cx,cy) specify the center, inr and outr specify -// the inner and outer radius of the gradient, icol specifies the start color and ocol the end color. -// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). -NVGpaint nvgRadialGradient(NVGcontext* ctx, float cx, float cy, float inr, float outr, - NVGcolor icol, NVGcolor ocol); - -// Creates and returns an image patter. Parameters (ox,oy) specify the left-top location of the image pattern, -// (ex,ey) the size of one image, angle rotation around the top-left corner, image is handle to the image to render. -// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). -NVGpaint nvgImagePattern(NVGcontext* ctx, float ox, float oy, float ex, float ey, - float angle, int image, float alpha); - -// -// Scissoring -// -// Scissoring allows you to clip the rendering into a rectangle. This is useful for various -// user interface cases like rendering a text edit or a timeline. - -// Sets the current scissor rectangle. -// The scissor rectangle is transformed by the current transform. -void nvgScissor(NVGcontext* ctx, float x, float y, float w, float h); - -// Intersects current scissor rectangle with the specified rectangle. -// The scissor rectangle is transformed by the current transform. -// Note: in case the rotation of previous scissor rect differs from -// the current one, the intersection will be done between the specified -// rectangle and the previous scissor rectangle transformed in the current -// transform space. The resulting shape is always rectangle. -void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h); - -// Reset and disables scissoring. -void nvgResetScissor(NVGcontext* ctx); - -// -// Paths -// -// Drawing a new shape starts with nvgBeginPath(), it clears all the currently defined paths. -// Then you define one or more paths and sub-paths which describe the shape. The are functions -// to draw common shapes like rectangles and circles, and lower level step-by-step functions, -// which allow to define a path curve by curve. -// -// NanoVG uses even-odd fill rule to draw the shapes. Solid shapes should have counter clockwise -// winding and holes should have counter clockwise order. To specify winding of a path you can -// call nvgPathWinding(). This is useful especially for the common shapes, which are drawn CCW. -// -// Finally you can fill the path using current fill style by calling nvgFill(), and stroke it -// with current stroke style by calling nvgStroke(). -// -// The curve segments and sub-paths are transformed by the current transform. - -// Clears the current path and sub-paths. -void nvgBeginPath(NVGcontext* ctx); - -// Starts new sub-path with specified point as first point. -void nvgMoveTo(NVGcontext* ctx, float x, float y); - -// Adds line segment from the last point in the path to the specified point. -void nvgLineTo(NVGcontext* ctx, float x, float y); - -// Adds cubic bezier segment from last point in the path via two control points to the specified point. -void nvgBezierTo(NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y); - -// Adds quadratic bezier segment from last point in the path via a control point to the specified point. -void nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y); - -// Adds an arc segment at the corner defined by the last path point, and two specified points. -void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius); - -// Closes current sub-path with a line segment. -void nvgClosePath(NVGcontext* ctx); - -// Sets the current sub-path winding, see NVGwinding and NVGsolidity. -void nvgPathWinding(NVGcontext* ctx, int dir); - -// Creates new circle arc shaped sub-path. The arc center is at cx,cy, the arc radius is r, -// and the arc is drawn from angle a0 to a1, and swept in direction dir (NVG_CCW, or NVG_CW). -// Angles are specified in radians. -void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir); - -// Creates new rectangle shaped sub-path. -void nvgRect(NVGcontext* ctx, float x, float y, float w, float h); - -// Creates new rounded rectangle shaped sub-path. -void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r); - -// Creates new rounded rectangle shaped sub-path with varying radii for each corner. -void nvgRoundedRectVarying(NVGcontext* ctx, float x, float y, float w, float h, float radTopLeft, float radTopRight, float radBottomRight, float radBottomLeft); - -// Creates new ellipse shaped sub-path. -void nvgEllipse(NVGcontext* ctx, float cx, float cy, float rx, float ry); - -// Creates new circle shaped sub-path. -void nvgCircle(NVGcontext* ctx, float cx, float cy, float r); - -// Fills the current path with current fill style. -void nvgFill(NVGcontext* ctx); - -// Fills the current path with current stroke style. -void nvgStroke(NVGcontext* ctx); - - -// -// Text -// -// NanoVG allows you to load .ttf files and use the font to render text. -// -// The appearance of the text can be defined by setting the current text style -// and by specifying the fill color. Common text and font settings such as -// font size, letter spacing and text align are supported. Font blur allows you -// to create simple text effects such as drop shadows. -// -// At render time the font face can be set based on the font handles or name. -// -// Font measure functions return values in local space, the calculations are -// carried in the same resolution as the final rendering. This is done because -// the text glyph positions are snapped to the nearest pixels sharp rendering. -// -// The local space means that values are not rotated or scale as per the current -// transformation. For example if you set font size to 12, which would mean that -// line height is 16, then regardless of the current scaling and rotation, the -// returned line height is always 16. Some measures may vary because of the scaling -// since aforementioned pixel snapping. -// -// While this may sound a little odd, the setup allows you to always render the -// same way regardless of scaling. I.e. following works regardless of scaling: -// -// const char* txt = "Text me up."; -// nvgTextBounds(vg, x,y, txt, NULL, bounds); -// nvgBeginPath(vg); -// nvgRoundedRect(vg, bounds[0],bounds[1], bounds[2]-bounds[0], bounds[3]-bounds[1]); -// nvgFill(vg); -// -// Note: currently only solid color fill is supported for text. - -// Creates font by loading it from the disk from specified file name. -// Returns handle to the font. -int nvgCreateFont(NVGcontext* ctx, const char* name, const char* filename); - -// Creates font by loading it from the specified memory chunk. -// Returns handle to the font. -int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData); - -// Finds a loaded font of specified name, and returns handle to it, or -1 if the font is not found. -int nvgFindFont(NVGcontext* ctx, const char* name); - -// Adds a fallback font by handle. -int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont); - -// Adds a fallback font by name. -int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont); - -// Sets the font size of current text style. -void nvgFontSize(NVGcontext* ctx, float size); - -// Sets the blur of current text style. -void nvgFontBlur(NVGcontext* ctx, float blur); - -// Sets the letter spacing of current text style. -void nvgTextLetterSpacing(NVGcontext* ctx, float spacing); - -// Sets the proportional line height of current text style. The line height is specified as multiple of font size. -void nvgTextLineHeight(NVGcontext* ctx, float lineHeight); - -// Sets the text align of current text style, see NVGalign for options. -void nvgTextAlign(NVGcontext* ctx, int align); - -// Sets the font face based on specified id of current text style. -void nvgFontFaceId(NVGcontext* ctx, int font); - -// Sets the font face based on specified name of current text style. -void nvgFontFace(NVGcontext* ctx, const char* font); - -// Draws text string at specified location. If end is specified only the sub-string up to the end is drawn. -float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char* end); - -// Draws multi-line text string at specified location wrapped at the specified width. If end is specified only the sub-string up to the end is drawn. -// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered. -// Words longer than the max width are slit at nearest character (i.e. no hyphenation). -void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end); - -// Measures the specified text string. Parameter bounds should be a pointer to float[4], -// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax] -// Returns the horizontal advance of the measured text (i.e. where the next character should drawn). -// Measured values are returned in local coordinate space. -float nvgTextBounds(NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds); - -// Measures the specified multi-text string. Parameter bounds should be a pointer to float[4], -// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax] -// Measured values are returned in local coordinate space. -void nvgTextBoxBounds(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds); - -// Calculates the glyph x positions of the specified text. If end is specified only the sub-string will be used. -// Measured values are returned in local coordinate space. -int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string, const char* end, NVGglyphPosition* positions, int maxPositions); - -// Returns the vertical metrics based on the current text style. -// Measured values are returned in local coordinate space. -void nvgTextMetrics(NVGcontext* ctx, float* ascender, float* descender, float* lineh); - -// Breaks the specified text into lines. If end is specified only the sub-string will be used. -// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered. -// Words longer than the max width are slit at nearest character (i.e. no hyphenation). -int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, NVGtextRow* rows, int maxRows); - -// -// Internal Render API -// -enum NVGtexture { - NVG_TEXTURE_ALPHA = 0x01, - NVG_TEXTURE_RGBA = 0x02, -}; - -struct NVGscissor { - float xform[6]; - float extent[2]; -}; -typedef struct NVGscissor NVGscissor; - -struct NVGvertex { - float x,y,u,v; -}; -typedef struct NVGvertex NVGvertex; - -struct NVGpath { - int first; - int count; - unsigned char closed; - int nbevel; - NVGvertex* fill; - int nfill; - NVGvertex* stroke; - int nstroke; - int winding; - int convex; -}; -typedef struct NVGpath NVGpath; - -struct NVGparams { - void* userPtr; - int edgeAntiAlias; - int (*renderCreate)(void* uptr); - int (*renderCreateTexture)(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data); - int (*renderDeleteTexture)(void* uptr, int image); - int (*renderUpdateTexture)(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data); - int (*renderGetTextureSize)(void* uptr, int image, int* w, int* h); - void (*renderViewport)(void* uptr, int width, int height, float devicePixelRatio); - void (*renderCancel)(void* uptr); - void (*renderFlush)(void* uptr, NVGcompositeOperationState compositeOperation); - void (*renderFill)(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe, const float* bounds, const NVGpath* paths, int npaths); - void (*renderStroke)(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe, float strokeWidth, const NVGpath* paths, int npaths); - void (*renderTriangles)(void* uptr, NVGpaint* paint, NVGscissor* scissor, const NVGvertex* verts, int nverts); - void (*renderDelete)(void* uptr); -}; -typedef struct NVGparams NVGparams; - -// Constructor and destructor, called by the render back-end. -NVGcontext* nvgCreateInternal(NVGparams* params); -void nvgDeleteInternal(NVGcontext* ctx); - -NVGparams* nvgInternalParams(NVGcontext* ctx); - -// Debug function to dump cached path data. -void nvgDebugDumpPathCache(NVGcontext* ctx); - -#ifdef _MSC_VER -#pragma warning(pop) -#endif - -#define NVG_NOTUSED(v) for (;;) { (void)(1 ? (void)0 : ( (void)(v) ) ); break; } - -#ifdef __cplusplus -} -#endif - -#endif // NANOVG_H diff --git a/third_party/nanovg/nanovg_gl.h b/third_party/nanovg/nanovg_gl.h deleted file mode 100644 index c050067321..0000000000 --- a/third_party/nanovg/nanovg_gl.h +++ /dev/null @@ -1,1592 +0,0 @@ -// -// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org -// -// This software is provided 'as-is', without any express or implied -// warranty. In no event will the authors be held liable for any damages -// arising from the use of this software. -// Permission is granted to anyone to use this software for any purpose, -// including commercial applications, and to alter it and redistribute it -// freely, subject to the following restrictions: -// 1. The origin of this software must not be misrepresented; you must not -// claim that you wrote the original software. If you use this software -// in a product, an acknowledgment in the product documentation would be -// appreciated but is not required. -// 2. Altered source versions must be plainly marked as such, and must not be -// misrepresented as being the original software. -// 3. This notice may not be removed or altered from any source distribution. -// -#ifndef NANOVG_GL_H -#define NANOVG_GL_H - -#ifdef __cplusplus -extern "C" { -#endif - -// Create flags - -enum NVGcreateFlags { - // Flag indicating if geometry based anti-aliasing is used (may not be needed when using MSAA). - NVG_ANTIALIAS = 1<<0, - // Flag indicating if strokes should be drawn using stencil buffer. The rendering will be a little - // slower, but path overlaps (i.e. self-intersecting or sharp turns) will be drawn just once. - NVG_STENCIL_STROKES = 1<<1, - // Flag indicating that additional debug checks are done. - NVG_DEBUG = 1<<2, -}; - -#if defined NANOVG_GL2_IMPLEMENTATION -# define NANOVG_GL2 1 -# define NANOVG_GL_IMPLEMENTATION 1 -#elif defined NANOVG_GL3_IMPLEMENTATION -# define NANOVG_GL3 1 -# define NANOVG_GL_IMPLEMENTATION 1 -# define NANOVG_GL_USE_UNIFORMBUFFER 1 -#elif defined NANOVG_GLES2_IMPLEMENTATION -# define NANOVG_GLES2 1 -# define NANOVG_GL_IMPLEMENTATION 1 -#elif defined NANOVG_GLES3_IMPLEMENTATION -# define NANOVG_GLES3 1 -# define NANOVG_GL_IMPLEMENTATION 1 -#endif - -#define NANOVG_GL_USE_STATE_FILTER (1) - -// Creates NanoVG contexts for different OpenGL (ES) versions. -// Flags should be combination of the create flags above. - -#if defined NANOVG_GL2 - -NVGcontext* nvgCreateGL2(int flags); -void nvgDeleteGL2(NVGcontext* ctx); - -int nvglCreateImageFromHandleGL2(NVGcontext* ctx, GLuint textureId, int w, int h, int flags); -GLuint nvglImageHandleGL2(NVGcontext* ctx, int image); - -#endif - -#if defined NANOVG_GL3 - -NVGcontext* nvgCreateGL3(int flags); -void nvgDeleteGL3(NVGcontext* ctx); - -int nvglCreateImageFromHandleGL3(NVGcontext* ctx, GLuint textureId, int w, int h, int flags); -GLuint nvglImageHandleGL3(NVGcontext* ctx, int image); - -#endif - -#if defined NANOVG_GLES2 - -NVGcontext* nvgCreateGLES2(int flags); -void nvgDeleteGLES2(NVGcontext* ctx); - -int nvglCreateImageFromHandleGLES2(NVGcontext* ctx, GLuint textureId, int w, int h, int flags); -GLuint nvglImageHandleGLES2(NVGcontext* ctx, int image); - -#endif - -#if defined NANOVG_GLES3 - -NVGcontext* nvgCreateGLES3(int flags); -void nvgDeleteGLES3(NVGcontext* ctx); - -int nvglCreateImageFromHandleGLES3(NVGcontext* ctx, GLuint textureId, int w, int h, int flags); -GLuint nvglImageHandleGLES3(NVGcontext* ctx, int image); - -#endif - -// These are additional flags on top of NVGimageFlags. -enum NVGimageFlagsGL { - NVG_IMAGE_NODELETE = 1<<16, // Do not delete GL texture handle. -}; - -#ifdef __cplusplus -} -#endif - -#endif /* NANOVG_GL_H */ - -#ifdef NANOVG_GL_IMPLEMENTATION - -#include -#include -#include -#include -#include "nanovg.h" - -enum GLNVGuniformLoc { - GLNVG_LOC_VIEWSIZE, - GLNVG_LOC_TEX, - GLNVG_LOC_FRAG, - GLNVG_MAX_LOCS -}; - -enum GLNVGshaderType { - NSVG_SHADER_FILLGRAD, - NSVG_SHADER_FILLIMG, - NSVG_SHADER_SIMPLE, - NSVG_SHADER_IMG -}; - -#if NANOVG_GL_USE_UNIFORMBUFFER -enum GLNVGuniformBindings { - GLNVG_FRAG_BINDING = 0, -}; -#endif - -struct GLNVGshader { - GLuint prog; - GLuint frag; - GLuint vert; - GLint loc[GLNVG_MAX_LOCS]; -}; -typedef struct GLNVGshader GLNVGshader; - -struct GLNVGtexture { - int id; - GLuint tex; - int width, height; - int type; - int flags; -}; -typedef struct GLNVGtexture GLNVGtexture; - -enum GLNVGcallType { - GLNVG_NONE = 0, - GLNVG_FILL, - GLNVG_CONVEXFILL, - GLNVG_STROKE, - GLNVG_TRIANGLES, -}; - -struct GLNVGcall { - int type; - int image; - int pathOffset; - int pathCount; - int triangleOffset; - int triangleCount; - int uniformOffset; -}; -typedef struct GLNVGcall GLNVGcall; - -struct GLNVGpath { - int fillOffset; - int fillCount; - int strokeOffset; - int strokeCount; -}; -typedef struct GLNVGpath GLNVGpath; - -struct GLNVGfragUniforms { - #if NANOVG_GL_USE_UNIFORMBUFFER - float scissorMat[12]; // matrices are actually 3 vec4s - float paintMat[12]; - struct NVGcolor innerCol; - struct NVGcolor outerCol; - float scissorExt[2]; - float scissorScale[2]; - float extent[2]; - float radius; - float feather; - float strokeMult; - float strokeThr; - int texType; - int type; - #else - // note: after modifying layout or size of uniform array, - // don't forget to also update the fragment shader source! - #define NANOVG_GL_UNIFORMARRAY_SIZE 11 - union { - struct { - float scissorMat[12]; // matrices are actually 3 vec4s - float paintMat[12]; - struct NVGcolor innerCol; - struct NVGcolor outerCol; - float scissorExt[2]; - float scissorScale[2]; - float extent[2]; - float radius; - float feather; - float strokeMult; - float strokeThr; - float texType; - float type; - }; - float uniformArray[NANOVG_GL_UNIFORMARRAY_SIZE][4]; - }; - #endif -}; -typedef struct GLNVGfragUniforms GLNVGfragUniforms; - -struct GLNVGcontext { - GLNVGshader shader; - GLNVGtexture* textures; - float view[2]; - int ntextures; - int ctextures; - int textureId; - GLuint vertBuf; -#if defined NANOVG_GL3 - GLuint vertArr; -#endif -#if NANOVG_GL_USE_UNIFORMBUFFER - GLuint fragBuf; -#endif - int fragSize; - int flags; - - // Per frame buffers - GLNVGcall* calls; - int ccalls; - int ncalls; - GLNVGpath* paths; - int cpaths; - int npaths; - struct NVGvertex* verts; - int cverts; - int nverts; - unsigned char* uniforms; - int cuniforms; - int nuniforms; - - // cached state - #if NANOVG_GL_USE_STATE_FILTER - GLuint boundTexture; - GLuint stencilMask; - GLenum stencilFunc; - GLint stencilFuncRef; - GLuint stencilFuncMask; - #endif -}; -typedef struct GLNVGcontext GLNVGcontext; - -static int glnvg__maxi(int a, int b) { return a > b ? a : b; } - -#ifdef NANOVG_GLES2 -static unsigned int glnvg__nearestPow2(unsigned int num) -{ - unsigned n = num > 0 ? num - 1 : 0; - n |= n >> 1; - n |= n >> 2; - n |= n >> 4; - n |= n >> 8; - n |= n >> 16; - n++; - return n; -} -#endif - -static void glnvg__bindTexture(GLNVGcontext* gl, GLuint tex) -{ -#if NANOVG_GL_USE_STATE_FILTER - if (gl->boundTexture != tex) { - gl->boundTexture = tex; - glBindTexture(GL_TEXTURE_2D, tex); - } -#else - glBindTexture(GL_TEXTURE_2D, tex); -#endif -} - -static void glnvg__stencilMask(GLNVGcontext* gl, GLuint mask) -{ -#if NANOVG_GL_USE_STATE_FILTER - if (gl->stencilMask != mask) { - gl->stencilMask = mask; - glStencilMask(mask); - } -#else - glStencilMask(mask); -#endif -} - -static void glnvg__stencilFunc(GLNVGcontext* gl, GLenum func, GLint ref, GLuint mask) -{ -#if NANOVG_GL_USE_STATE_FILTER - if ((gl->stencilFunc != func) || - (gl->stencilFuncRef != ref) || - (gl->stencilFuncMask != mask)) { - - gl->stencilFunc = func; - gl->stencilFuncRef = ref; - gl->stencilFuncMask = mask; - glStencilFunc(func, ref, mask); - } -#else - glStencilFunc(func, ref, mask); -#endif -} - -static GLNVGtexture* glnvg__allocTexture(GLNVGcontext* gl) -{ - GLNVGtexture* tex = NULL; - int i; - - for (i = 0; i < gl->ntextures; i++) { - if (gl->textures[i].id == 0) { - tex = &gl->textures[i]; - break; - } - } - if (tex == NULL) { - if (gl->ntextures+1 > gl->ctextures) { - GLNVGtexture* textures; - int ctextures = glnvg__maxi(gl->ntextures+1, 4) + gl->ctextures/2; // 1.5x Overallocate - textures = (GLNVGtexture*)realloc(gl->textures, sizeof(GLNVGtexture)*ctextures); - if (textures == NULL) return NULL; - gl->textures = textures; - gl->ctextures = ctextures; - } - tex = &gl->textures[gl->ntextures++]; - } - - memset(tex, 0, sizeof(*tex)); - tex->id = ++gl->textureId; - - return tex; -} - -static GLNVGtexture* glnvg__findTexture(GLNVGcontext* gl, int id) -{ - int i; - for (i = 0; i < gl->ntextures; i++) - if (gl->textures[i].id == id) - return &gl->textures[i]; - return NULL; -} - -static int glnvg__deleteTexture(GLNVGcontext* gl, int id) -{ - int i; - for (i = 0; i < gl->ntextures; i++) { - if (gl->textures[i].id == id) { - if (gl->textures[i].tex != 0 && (gl->textures[i].flags & NVG_IMAGE_NODELETE) == 0) - glDeleteTextures(1, &gl->textures[i].tex); - memset(&gl->textures[i], 0, sizeof(gl->textures[i])); - return 1; - } - } - return 0; -} - -static void glnvg__dumpShaderError(GLuint shader, const char* name, const char* type) -{ - GLchar str[512+1]; - GLsizei len = 0; - glGetShaderInfoLog(shader, 512, &len, str); - if (len > 512) len = 512; - str[len] = '\0'; - printf("Shader %s/%s error:\n%s\n", name, type, str); -} - -static void glnvg__dumpProgramError(GLuint prog, const char* name) -{ - GLchar str[512+1]; - GLsizei len = 0; - glGetProgramInfoLog(prog, 512, &len, str); - if (len > 512) len = 512; - str[len] = '\0'; - printf("Program %s error:\n%s\n", name, str); -} - -static void glnvg__checkError(GLNVGcontext* gl, const char* str) -{ - GLenum err; - if ((gl->flags & NVG_DEBUG) == 0) return; - err = glGetError(); - if (err != GL_NO_ERROR) { - printf("Error %08x after %s\n", err, str); - return; - } -} - -static int glnvg__createShader(GLNVGshader* shader, const char* name, const char* header, const char* opts, const char* vshader, const char* fshader) -{ - GLint status; - GLuint prog, vert, frag; - const char* str[3]; - str[0] = header; - str[1] = opts != NULL ? opts : ""; - - memset(shader, 0, sizeof(*shader)); - - prog = glCreateProgram(); - vert = glCreateShader(GL_VERTEX_SHADER); - frag = glCreateShader(GL_FRAGMENT_SHADER); - str[2] = vshader; - glShaderSource(vert, 3, str, 0); - str[2] = fshader; - glShaderSource(frag, 3, str, 0); - - glCompileShader(vert); - glGetShaderiv(vert, GL_COMPILE_STATUS, &status); - if (status != GL_TRUE) { - glnvg__dumpShaderError(vert, name, "vert"); - return 0; - } - - glCompileShader(frag); - glGetShaderiv(frag, GL_COMPILE_STATUS, &status); - if (status != GL_TRUE) { - glnvg__dumpShaderError(frag, name, "frag"); - return 0; - } - - glAttachShader(prog, vert); - glAttachShader(prog, frag); - - glBindAttribLocation(prog, 0, "vertex"); - glBindAttribLocation(prog, 1, "tcoord"); - - glLinkProgram(prog); - glGetProgramiv(prog, GL_LINK_STATUS, &status); - if (status != GL_TRUE) { - glnvg__dumpProgramError(prog, name); - return 0; - } - - shader->prog = prog; - shader->vert = vert; - shader->frag = frag; - - return 1; -} - -static void glnvg__deleteShader(GLNVGshader* shader) -{ - if (shader->prog != 0) - glDeleteProgram(shader->prog); - if (shader->vert != 0) - glDeleteShader(shader->vert); - if (shader->frag != 0) - glDeleteShader(shader->frag); -} - -static void glnvg__getUniforms(GLNVGshader* shader) -{ - shader->loc[GLNVG_LOC_VIEWSIZE] = glGetUniformLocation(shader->prog, "viewSize"); - shader->loc[GLNVG_LOC_TEX] = glGetUniformLocation(shader->prog, "tex"); - -#if NANOVG_GL_USE_UNIFORMBUFFER - shader->loc[GLNVG_LOC_FRAG] = glGetUniformBlockIndex(shader->prog, "frag"); -#else - shader->loc[GLNVG_LOC_FRAG] = glGetUniformLocation(shader->prog, "frag"); -#endif -} - -static int glnvg__renderCreate(void* uptr) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - int align = 4; - - // TODO: mediump float may not be enough for GLES2 in iOS. - // see the following discussion: https://github.com/memononen/nanovg/issues/46 - static const char* shaderHeader = -#if defined NANOVG_GL2 - "#define NANOVG_GL2 1\n" -#elif defined NANOVG_GL3 - "#version 150 core\n" - "#define NANOVG_GL3 1\n" -#elif defined NANOVG_GLES2 - "#version 100\n" - "#define NANOVG_GL2 1\n" -#elif defined NANOVG_GLES3 - "#version 300 es\n" - "#define NANOVG_GL3 1\n" -#endif - -#if NANOVG_GL_USE_UNIFORMBUFFER - "#define USE_UNIFORMBUFFER 1\n" -#else - "#define UNIFORMARRAY_SIZE 11\n" -#endif - "\n"; - - static const char* fillVertShader = - "#ifdef NANOVG_GL3\n" - " uniform vec2 viewSize;\n" - " in vec2 vertex;\n" - " in vec2 tcoord;\n" - " out vec2 ftcoord;\n" - " out vec2 fpos;\n" - "#else\n" - " uniform vec2 viewSize;\n" - " attribute vec2 vertex;\n" - " attribute vec2 tcoord;\n" - " varying vec2 ftcoord;\n" - " varying vec2 fpos;\n" - "#endif\n" - "void main(void) {\n" - " ftcoord = tcoord;\n" - " fpos = vertex;\n" - " gl_Position = vec4(2.0*vertex.x/viewSize.x - 1.0, 1.0 - 2.0*vertex.y/viewSize.y, 0, 1);\n" - "}\n"; - - static const char* fillFragShader = - "#ifdef GL_ES\n" - "#if defined(GL_FRAGMENT_PRECISION_HIGH) || defined(NANOVG_GL3)\n" - " precision highp float;\n" - "#else\n" - " precision mediump float;\n" - "#endif\n" - "#endif\n" - "#ifdef NANOVG_GL3\n" - "#ifdef USE_UNIFORMBUFFER\n" - " layout(std140) uniform frag {\n" - " mat3 scissorMat;\n" - " mat3 paintMat;\n" - " vec4 innerCol;\n" - " vec4 outerCol;\n" - " vec2 scissorExt;\n" - " vec2 scissorScale;\n" - " vec2 extent;\n" - " float radius;\n" - " float feather;\n" - " float strokeMult;\n" - " float strokeThr;\n" - " int texType;\n" - " int type;\n" - " };\n" - "#else\n" // NANOVG_GL3 && !USE_UNIFORMBUFFER - " uniform vec4 frag[UNIFORMARRAY_SIZE];\n" - "#endif\n" - " uniform sampler2D tex;\n" - " in vec2 ftcoord;\n" - " in vec2 fpos;\n" - " out vec4 outColor;\n" - "#else\n" // !NANOVG_GL3 - " uniform vec4 frag[UNIFORMARRAY_SIZE];\n" - " uniform sampler2D tex;\n" - " varying vec2 ftcoord;\n" - " varying vec2 fpos;\n" - "#endif\n" - "#ifndef USE_UNIFORMBUFFER\n" - " #define scissorMat mat3(frag[0].xyz, frag[1].xyz, frag[2].xyz)\n" - " #define paintMat mat3(frag[3].xyz, frag[4].xyz, frag[5].xyz)\n" - " #define innerCol frag[6]\n" - " #define outerCol frag[7]\n" - " #define scissorExt frag[8].xy\n" - " #define scissorScale frag[8].zw\n" - " #define extent frag[9].xy\n" - " #define radius frag[9].z\n" - " #define feather frag[9].w\n" - " #define strokeMult frag[10].x\n" - " #define strokeThr frag[10].y\n" - " #define texType int(frag[10].z)\n" - " #define type int(frag[10].w)\n" - "#endif\n" - "\n" - "float sdroundrect(vec2 pt, vec2 ext, float rad) {\n" - " vec2 ext2 = ext - vec2(rad,rad);\n" - " vec2 d = abs(pt) - ext2;\n" - " return min(max(d.x,d.y),0.0) + length(max(d,0.0)) - rad;\n" - "}\n" - "\n" - "// Scissoring\n" - "float scissorMask(vec2 p) {\n" - " vec2 sc = (abs((scissorMat * vec3(p,1.0)).xy) - scissorExt);\n" - " sc = vec2(0.5,0.5) - sc * scissorScale;\n" - " return clamp(sc.x,0.0,1.0) * clamp(sc.y,0.0,1.0);\n" - "}\n" - "#ifdef EDGE_AA\n" - "// Stroke - from [0..1] to clipped pyramid, where the slope is 1px.\n" - "float strokeMask() {\n" - " return min(1.0, (1.0-abs(ftcoord.x*2.0-1.0))*strokeMult) * min(1.0, ftcoord.y);\n" - "}\n" - "#endif\n" - "\n" - "void main(void) {\n" - " vec4 result;\n" - " float scissor = scissorMask(fpos);\n" - "#ifdef EDGE_AA\n" - " float strokeAlpha = strokeMask();\n" - "#else\n" - " float strokeAlpha = 1.0;\n" - "#endif\n" - " if (type == 0) { // Gradient\n" - " // Calculate gradient color using box gradient\n" - " vec2 pt = (paintMat * vec3(fpos,1.0)).xy;\n" - " float d = clamp((sdroundrect(pt, extent, radius) + feather*0.5) / feather, 0.0, 1.0);\n" - " vec4 color = mix(innerCol,outerCol,d);\n" - " // Combine alpha\n" - " color *= strokeAlpha * scissor;\n" - " result = color;\n" - " } else if (type == 1) { // Image\n" - " // Calculate color fron texture\n" - " vec2 pt = (paintMat * vec3(fpos,1.0)).xy / extent;\n" - "#ifdef NANOVG_GL3\n" - " vec4 color = texture(tex, pt);\n" - "#else\n" - " vec4 color = texture2D(tex, pt);\n" - "#endif\n" - " if (texType == 1) color = vec4(color.xyz*color.w,color.w);" - " if (texType == 2) color = vec4(color.x);" - " // Apply color tint and alpha.\n" - " color *= innerCol;\n" - " // Combine alpha\n" - " color *= strokeAlpha * scissor;\n" - " result = color;\n" - " } else if (type == 2) { // Stencil fill\n" - " result = vec4(1,1,1,1);\n" - " } else if (type == 3) { // Textured tris\n" - "#ifdef NANOVG_GL3\n" - " vec4 color = texture(tex, ftcoord);\n" - "#else\n" - " vec4 color = texture2D(tex, ftcoord);\n" - "#endif\n" - " if (texType == 1) color = vec4(color.xyz*color.w,color.w);" - " if (texType == 2) color = vec4(color.x);" - " color *= scissor;\n" - " result = color * innerCol;\n" - " }\n" - "#ifdef EDGE_AA\n" - " if (strokeAlpha < strokeThr) discard;\n" - "#endif\n" - "#ifdef NANOVG_GL3\n" - " outColor = result;\n" - "#else\n" - " gl_FragColor = result;\n" - "#endif\n" - "}\n"; - - glnvg__checkError(gl, "init"); - - if (gl->flags & NVG_ANTIALIAS) { - if (glnvg__createShader(&gl->shader, "shader", shaderHeader, "#define EDGE_AA 1\n", fillVertShader, fillFragShader) == 0) - return 0; - } else { - if (glnvg__createShader(&gl->shader, "shader", shaderHeader, NULL, fillVertShader, fillFragShader) == 0) - return 0; - } - - glnvg__checkError(gl, "uniform locations"); - glnvg__getUniforms(&gl->shader); - - // Create dynamic vertex array -#if defined NANOVG_GL3 - glGenVertexArrays(1, &gl->vertArr); -#endif - glGenBuffers(1, &gl->vertBuf); - -#if NANOVG_GL_USE_UNIFORMBUFFER - // Create UBOs - glUniformBlockBinding(gl->shader.prog, gl->shader.loc[GLNVG_LOC_FRAG], GLNVG_FRAG_BINDING); - glGenBuffers(1, &gl->fragBuf); - glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &align); -#endif - gl->fragSize = sizeof(GLNVGfragUniforms) + align - sizeof(GLNVGfragUniforms) % align; - - glnvg__checkError(gl, "create done"); - - glFinish(); - - return 1; -} - -static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - GLNVGtexture* tex = glnvg__allocTexture(gl); - - if (tex == NULL) return 0; - -#ifdef NANOVG_GLES2 - // Check for non-power of 2. - if (glnvg__nearestPow2(w) != (unsigned int)w || glnvg__nearestPow2(h) != (unsigned int)h) { - // No repeat - if ((imageFlags & NVG_IMAGE_REPEATX) != 0 || (imageFlags & NVG_IMAGE_REPEATY) != 0) { - printf("Repeat X/Y is not supported for non power-of-two textures (%d x %d)\n", w, h); - imageFlags &= ~(NVG_IMAGE_REPEATX | NVG_IMAGE_REPEATY); - } - // No mips. - if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) { - printf("Mip-maps is not support for non power-of-two textures (%d x %d)\n", w, h); - imageFlags &= ~NVG_IMAGE_GENERATE_MIPMAPS; - } - } -#endif - - glGenTextures(1, &tex->tex); - tex->width = w; - tex->height = h; - tex->type = type; - tex->flags = imageFlags; - glnvg__bindTexture(gl, tex->tex); - - glPixelStorei(GL_UNPACK_ALIGNMENT,1); -#ifndef NANOVG_GLES2 - glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width); - glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); - glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); -#endif - -#if defined (NANOVG_GL2) - // GL 1.4 and later has support for generating mipmaps using a tex parameter. - if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) { - glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE); - } -#endif - - if (type == NVG_TEXTURE_RGBA) - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); - else -#if defined(NANOVG_GLES2) - glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, w, h, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data); -#elif defined(NANOVG_GLES3) - glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data); -#else - glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data); -#endif - - if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) { - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); - } else { - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); - } - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); - - if (imageFlags & NVG_IMAGE_REPEATX) - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); - else - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); - - if (imageFlags & NVG_IMAGE_REPEATY) - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); - else - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); - - glPixelStorei(GL_UNPACK_ALIGNMENT, 4); -#ifndef NANOVG_GLES2 - glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); - glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); - glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); -#endif - - // The new way to build mipmaps on GLES and GL3 -#if !defined(NANOVG_GL2) - if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) { - glGenerateMipmap(GL_TEXTURE_2D); - } -#endif - - glnvg__checkError(gl, "create tex"); - glnvg__bindTexture(gl, 0); - - return tex->id; -} - - -static int glnvg__renderDeleteTexture(void* uptr, int image) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - return glnvg__deleteTexture(gl, image); -} - -static int glnvg__renderUpdateTexture(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - GLNVGtexture* tex = glnvg__findTexture(gl, image); - - if (tex == NULL) return 0; - glnvg__bindTexture(gl, tex->tex); - - glPixelStorei(GL_UNPACK_ALIGNMENT,1); - -#ifndef NANOVG_GLES2 - glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width); - glPixelStorei(GL_UNPACK_SKIP_PIXELS, x); - glPixelStorei(GL_UNPACK_SKIP_ROWS, y); -#else - // No support for all of skip, need to update a whole row at a time. - if (tex->type == NVG_TEXTURE_RGBA) - data += y*tex->width*4; - else - data += y*tex->width; - x = 0; - w = tex->width; -#endif - - if (tex->type == NVG_TEXTURE_RGBA) - glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RGBA, GL_UNSIGNED_BYTE, data); - else -#ifdef NANOVG_GLES2 - glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_LUMINANCE, GL_UNSIGNED_BYTE, data); -#else - glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RED, GL_UNSIGNED_BYTE, data); -#endif - - glPixelStorei(GL_UNPACK_ALIGNMENT, 4); -#ifndef NANOVG_GLES2 - glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); - glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); - glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); -#endif - - glnvg__bindTexture(gl, 0); - - return 1; -} - -static int glnvg__renderGetTextureSize(void* uptr, int image, int* w, int* h) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - GLNVGtexture* tex = glnvg__findTexture(gl, image); - if (tex == NULL) return 0; - *w = tex->width; - *h = tex->height; - return 1; -} - -static void glnvg__xformToMat3x4(float* m3, float* t) -{ - m3[0] = t[0]; - m3[1] = t[1]; - m3[2] = 0.0f; - m3[3] = 0.0f; - m3[4] = t[2]; - m3[5] = t[3]; - m3[6] = 0.0f; - m3[7] = 0.0f; - m3[8] = t[4]; - m3[9] = t[5]; - m3[10] = 1.0f; - m3[11] = 0.0f; -} - -static NVGcolor glnvg__premulColor(NVGcolor c) -{ - c.r *= c.a; - c.g *= c.a; - c.b *= c.a; - return c; -} - -static int glnvg__convertPaint(GLNVGcontext* gl, GLNVGfragUniforms* frag, NVGpaint* paint, - NVGscissor* scissor, float width, float fringe, float strokeThr) -{ - GLNVGtexture* tex = NULL; - float invxform[6]; - - memset(frag, 0, sizeof(*frag)); - - frag->innerCol = glnvg__premulColor(paint->innerColor); - frag->outerCol = glnvg__premulColor(paint->outerColor); - - if (scissor->extent[0] < -0.5f || scissor->extent[1] < -0.5f) { - memset(frag->scissorMat, 0, sizeof(frag->scissorMat)); - frag->scissorExt[0] = 1.0f; - frag->scissorExt[1] = 1.0f; - frag->scissorScale[0] = 1.0f; - frag->scissorScale[1] = 1.0f; - } else { - nvgTransformInverse(invxform, scissor->xform); - glnvg__xformToMat3x4(frag->scissorMat, invxform); - frag->scissorExt[0] = scissor->extent[0]; - frag->scissorExt[1] = scissor->extent[1]; - frag->scissorScale[0] = sqrtf(scissor->xform[0]*scissor->xform[0] + scissor->xform[2]*scissor->xform[2]) / fringe; - frag->scissorScale[1] = sqrtf(scissor->xform[1]*scissor->xform[1] + scissor->xform[3]*scissor->xform[3]) / fringe; - } - - memcpy(frag->extent, paint->extent, sizeof(frag->extent)); - frag->strokeMult = (width*0.5f + fringe*0.5f) / fringe; - frag->strokeThr = strokeThr; - - if (paint->image != 0) { - tex = glnvg__findTexture(gl, paint->image); - if (tex == NULL) return 0; - if ((tex->flags & NVG_IMAGE_FLIPY) != 0) { - float m1[6], m2[6]; - nvgTransformTranslate(m1, 0.0f, frag->extent[1] * 0.5f); - nvgTransformMultiply(m1, paint->xform); - nvgTransformScale(m2, 1.0f, -1.0f); - nvgTransformMultiply(m2, m1); - nvgTransformTranslate(m1, 0.0f, -frag->extent[1] * 0.5f); - nvgTransformMultiply(m1, m2); - nvgTransformInverse(invxform, m1); - } else { - nvgTransformInverse(invxform, paint->xform); - } - frag->type = NSVG_SHADER_FILLIMG; - - if (tex->type == NVG_TEXTURE_RGBA) - frag->texType = (tex->flags & NVG_IMAGE_PREMULTIPLIED) ? 0 : 1; - else - frag->texType = 2; -// printf("frag->texType = %d\n", frag->texType); - } else { - frag->type = NSVG_SHADER_FILLGRAD; - frag->radius = paint->radius; - frag->feather = paint->feather; - nvgTransformInverse(invxform, paint->xform); - } - - glnvg__xformToMat3x4(frag->paintMat, invxform); - - return 1; -} - -static GLNVGfragUniforms* nvg__fragUniformPtr(GLNVGcontext* gl, int i); - -static void glnvg__setUniforms(GLNVGcontext* gl, int uniformOffset, int image) -{ -#if NANOVG_GL_USE_UNIFORMBUFFER - glBindBufferRange(GL_UNIFORM_BUFFER, GLNVG_FRAG_BINDING, gl->fragBuf, uniformOffset, sizeof(GLNVGfragUniforms)); -#else - GLNVGfragUniforms* frag = nvg__fragUniformPtr(gl, uniformOffset); - glUniform4fv(gl->shader.loc[GLNVG_LOC_FRAG], NANOVG_GL_UNIFORMARRAY_SIZE, &(frag->uniformArray[0][0])); -#endif - - if (image != 0) { - GLNVGtexture* tex = glnvg__findTexture(gl, image); - glnvg__bindTexture(gl, tex != NULL ? tex->tex : 0); - glnvg__checkError(gl, "tex paint tex"); - } else { - glnvg__bindTexture(gl, 0); - } -} - -static void glnvg__renderViewport(void* uptr, int width, int height, float devicePixelRatio) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - gl->view[0] = (float)width; - gl->view[1] = (float)height; -} - -static void glnvg__fill(GLNVGcontext* gl, GLNVGcall* call) -{ - GLNVGpath* paths = &gl->paths[call->pathOffset]; - int i, npaths = call->pathCount; - - // Draw shapes - glEnable(GL_STENCIL_TEST); - glnvg__stencilMask(gl, 0xff); - glnvg__stencilFunc(gl, GL_ALWAYS, 0, 0xff); - glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); - - // set bindpoint for solid loc - glnvg__setUniforms(gl, call->uniformOffset, 0); - glnvg__checkError(gl, "fill simple"); - - glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP); - glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP); - glDisable(GL_CULL_FACE); - for (i = 0; i < npaths; i++) - glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount); - glEnable(GL_CULL_FACE); - - // Draw anti-aliased pixels - glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); - - glnvg__setUniforms(gl, call->uniformOffset + gl->fragSize, call->image); - glnvg__checkError(gl, "fill fill"); - - if (gl->flags & NVG_ANTIALIAS) { - glnvg__stencilFunc(gl, GL_EQUAL, 0x00, 0xff); - glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); - // Draw fringes - for (i = 0; i < npaths; i++) - glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); - } - - // Draw fill - glnvg__stencilFunc(gl, GL_NOTEQUAL, 0x0, 0xff); - glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO); - glDrawArrays(GL_TRIANGLES, call->triangleOffset, call->triangleCount); - - glDisable(GL_STENCIL_TEST); -} - -static void glnvg__convexFill(GLNVGcontext* gl, GLNVGcall* call) -{ - GLNVGpath* paths = &gl->paths[call->pathOffset]; - int i, npaths = call->pathCount; - - glnvg__setUniforms(gl, call->uniformOffset, call->image); - glnvg__checkError(gl, "convex fill"); - - for (i = 0; i < npaths; i++) - glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount); - if (gl->flags & NVG_ANTIALIAS) { - // Draw fringes - for (i = 0; i < npaths; i++) - glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); - } -} - -static void glnvg__stroke(GLNVGcontext* gl, GLNVGcall* call) -{ - GLNVGpath* paths = &gl->paths[call->pathOffset]; - int npaths = call->pathCount, i; - - if (gl->flags & NVG_STENCIL_STROKES) { - - glEnable(GL_STENCIL_TEST); - glnvg__stencilMask(gl, 0xff); - - // Fill the stroke base without overlap - glnvg__stencilFunc(gl, GL_EQUAL, 0x0, 0xff); - glStencilOp(GL_KEEP, GL_KEEP, GL_INCR); - glnvg__setUniforms(gl, call->uniformOffset + gl->fragSize, call->image); - glnvg__checkError(gl, "stroke fill 0"); - for (i = 0; i < npaths; i++) - glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); - - // Draw anti-aliased pixels. - glnvg__setUniforms(gl, call->uniformOffset, call->image); - glnvg__stencilFunc(gl, GL_EQUAL, 0x00, 0xff); - glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); - for (i = 0; i < npaths; i++) - glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); - - // Clear stencil buffer. - glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); - glnvg__stencilFunc(gl, GL_ALWAYS, 0x0, 0xff); - glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO); - glnvg__checkError(gl, "stroke fill 1"); - for (i = 0; i < npaths; i++) - glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); - glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); - - glDisable(GL_STENCIL_TEST); - -// glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, strokeWidth, fringe, 1.0f - 0.5f/255.0f); - - } else { - glnvg__setUniforms(gl, call->uniformOffset, call->image); - glnvg__checkError(gl, "stroke fill"); - // Draw Strokes - for (i = 0; i < npaths; i++) - glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); - } -} - -static void glnvg__triangles(GLNVGcontext* gl, GLNVGcall* call) -{ - glnvg__setUniforms(gl, call->uniformOffset, call->image); - glnvg__checkError(gl, "triangles fill"); - - glDrawArrays(GL_TRIANGLES, call->triangleOffset, call->triangleCount); -} - -static void glnvg__renderCancel(void* uptr) { - GLNVGcontext* gl = (GLNVGcontext*)uptr; - gl->nverts = 0; - gl->npaths = 0; - gl->ncalls = 0; - gl->nuniforms = 0; -} - -static GLenum glnvg_convertBlendFuncFactor(int factor) -{ - if (factor == NVG_ZERO) - return GL_ZERO; - if (factor == NVG_ONE) - return GL_ONE; - if (factor == NVG_SRC_COLOR) - return GL_SRC_COLOR; - if (factor == NVG_ONE_MINUS_SRC_COLOR) - return GL_ONE_MINUS_SRC_COLOR; - if (factor == NVG_DST_COLOR) - return GL_DST_COLOR; - if (factor == NVG_ONE_MINUS_DST_COLOR) - return GL_ONE_MINUS_DST_COLOR; - if (factor == NVG_SRC_ALPHA) - return GL_SRC_ALPHA; - if (factor == NVG_ONE_MINUS_SRC_ALPHA) - return GL_ONE_MINUS_SRC_ALPHA; - if (factor == NVG_DST_ALPHA) - return GL_DST_ALPHA; - if (factor == NVG_ONE_MINUS_DST_ALPHA) - return GL_ONE_MINUS_DST_ALPHA; - if (factor == NVG_SRC_ALPHA_SATURATE) - return GL_SRC_ALPHA_SATURATE; - return GL_INVALID_ENUM; -} - -static void glnvg__blendCompositeOperation(NVGcompositeOperationState op) -{ - GLenum srcRGB = glnvg_convertBlendFuncFactor(op.srcRGB); - GLenum dstRGB = glnvg_convertBlendFuncFactor(op.dstRGB); - GLenum srcAlpha = glnvg_convertBlendFuncFactor(op.srcAlpha); - GLenum dstAlpha = glnvg_convertBlendFuncFactor(op.dstAlpha); - if (srcRGB == GL_INVALID_ENUM || dstRGB == GL_INVALID_ENUM || srcAlpha == GL_INVALID_ENUM || dstAlpha == GL_INVALID_ENUM) - glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); - else - glBlendFuncSeparate(srcRGB, dstRGB, srcAlpha, dstAlpha); -} - -static void glnvg__renderFlush(void* uptr, NVGcompositeOperationState compositeOperation) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - int i; - - if (gl->ncalls > 0) { - - // Setup require GL state. - glUseProgram(gl->shader.prog); - - glnvg__blendCompositeOperation(compositeOperation); - glEnable(GL_CULL_FACE); - glCullFace(GL_BACK); - glFrontFace(GL_CCW); - glEnable(GL_BLEND); - glDisable(GL_DEPTH_TEST); - glDisable(GL_SCISSOR_TEST); - glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); - glStencilMask(0xffffffff); - glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); - glStencilFunc(GL_ALWAYS, 0, 0xffffffff); - glActiveTexture(GL_TEXTURE0); - glBindTexture(GL_TEXTURE_2D, 0); - #if NANOVG_GL_USE_STATE_FILTER - gl->boundTexture = 0; - gl->stencilMask = 0xffffffff; - gl->stencilFunc = GL_ALWAYS; - gl->stencilFuncRef = 0; - gl->stencilFuncMask = 0xffffffff; - #endif - -#if NANOVG_GL_USE_UNIFORMBUFFER - // Upload ubo for frag shaders - glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf); - glBufferData(GL_UNIFORM_BUFFER, gl->nuniforms * gl->fragSize, gl->uniforms, GL_STREAM_DRAW); -#endif - - // Upload vertex data -#if defined NANOVG_GL3 - glBindVertexArray(gl->vertArr); -#endif - glBindBuffer(GL_ARRAY_BUFFER, gl->vertBuf); - glBufferData(GL_ARRAY_BUFFER, gl->nverts * sizeof(NVGvertex), gl->verts, GL_STREAM_DRAW); - glEnableVertexAttribArray(0); - glEnableVertexAttribArray(1); - glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(NVGvertex), (const GLvoid*)(size_t)0); - glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(NVGvertex), (const GLvoid*)(0 + 2*sizeof(float))); - - // Set view and texture just once per frame. - glUniform1i(gl->shader.loc[GLNVG_LOC_TEX], 0); - glUniform2fv(gl->shader.loc[GLNVG_LOC_VIEWSIZE], 1, gl->view); - -#if NANOVG_GL_USE_UNIFORMBUFFER - glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf); -#endif - - for (i = 0; i < gl->ncalls; i++) { - GLNVGcall* call = &gl->calls[i]; - if (call->type == GLNVG_FILL) - glnvg__fill(gl, call); - else if (call->type == GLNVG_CONVEXFILL) - glnvg__convexFill(gl, call); - else if (call->type == GLNVG_STROKE) - glnvg__stroke(gl, call); - else if (call->type == GLNVG_TRIANGLES) - glnvg__triangles(gl, call); - } - - glDisableVertexAttribArray(0); - glDisableVertexAttribArray(1); -#if defined NANOVG_GL3 - glBindVertexArray(0); -#endif - glDisable(GL_CULL_FACE); - glBindBuffer(GL_ARRAY_BUFFER, 0); - glUseProgram(0); - glnvg__bindTexture(gl, 0); - } - - // Reset calls - gl->nverts = 0; - gl->npaths = 0; - gl->ncalls = 0; - gl->nuniforms = 0; -} - -static int glnvg__maxVertCount(const NVGpath* paths, int npaths) -{ - int i, count = 0; - for (i = 0; i < npaths; i++) { - count += paths[i].nfill; - count += paths[i].nstroke; - } - return count; -} - -static GLNVGcall* glnvg__allocCall(GLNVGcontext* gl) -{ - GLNVGcall* ret = NULL; - if (gl->ncalls+1 > gl->ccalls) { - GLNVGcall* calls; - int ccalls = glnvg__maxi(gl->ncalls+1, 128) + gl->ccalls/2; // 1.5x Overallocate - calls = (GLNVGcall*)realloc(gl->calls, sizeof(GLNVGcall) * ccalls); - if (calls == NULL) return NULL; - gl->calls = calls; - gl->ccalls = ccalls; - } - ret = &gl->calls[gl->ncalls++]; - memset(ret, 0, sizeof(GLNVGcall)); - return ret; -} - -static int glnvg__allocPaths(GLNVGcontext* gl, int n) -{ - int ret = 0; - if (gl->npaths+n > gl->cpaths) { - GLNVGpath* paths; - int cpaths = glnvg__maxi(gl->npaths + n, 128) + gl->cpaths/2; // 1.5x Overallocate - paths = (GLNVGpath*)realloc(gl->paths, sizeof(GLNVGpath) * cpaths); - if (paths == NULL) return -1; - gl->paths = paths; - gl->cpaths = cpaths; - } - ret = gl->npaths; - gl->npaths += n; - return ret; -} - -static int glnvg__allocVerts(GLNVGcontext* gl, int n) -{ - int ret = 0; - if (gl->nverts+n > gl->cverts) { - NVGvertex* verts; - int cverts = glnvg__maxi(gl->nverts + n, 4096) + gl->cverts/2; // 1.5x Overallocate - verts = (NVGvertex*)realloc(gl->verts, sizeof(NVGvertex) * cverts); - if (verts == NULL) return -1; - gl->verts = verts; - gl->cverts = cverts; - } - ret = gl->nverts; - gl->nverts += n; - return ret; -} - -static int glnvg__allocFragUniforms(GLNVGcontext* gl, int n) -{ - int ret = 0, structSize = gl->fragSize; - if (gl->nuniforms+n > gl->cuniforms) { - unsigned char* uniforms; - int cuniforms = glnvg__maxi(gl->nuniforms+n, 128) + gl->cuniforms/2; // 1.5x Overallocate - uniforms = (unsigned char*)realloc(gl->uniforms, structSize * cuniforms); - if (uniforms == NULL) return -1; - gl->uniforms = uniforms; - gl->cuniforms = cuniforms; - } - ret = gl->nuniforms * structSize; - gl->nuniforms += n; - return ret; -} - -static GLNVGfragUniforms* nvg__fragUniformPtr(GLNVGcontext* gl, int i) -{ - return (GLNVGfragUniforms*)&gl->uniforms[i]; -} - -static void glnvg__vset(NVGvertex* vtx, float x, float y, float u, float v) -{ - vtx->x = x; - vtx->y = y; - vtx->u = u; - vtx->v = v; -} - -static void glnvg__renderFill(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe, - const float* bounds, const NVGpath* paths, int npaths) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - GLNVGcall* call = glnvg__allocCall(gl); - NVGvertex* quad; - GLNVGfragUniforms* frag; - int i, maxverts, offset; - - if (call == NULL) return; - - call->type = GLNVG_FILL; - call->pathOffset = glnvg__allocPaths(gl, npaths); - if (call->pathOffset == -1) goto error; - call->pathCount = npaths; - call->image = paint->image; - - if (npaths == 1 && paths[0].convex) - call->type = GLNVG_CONVEXFILL; - - // Allocate vertices for all the paths. - maxverts = glnvg__maxVertCount(paths, npaths) + 6; - offset = glnvg__allocVerts(gl, maxverts); - if (offset == -1) goto error; - - for (i = 0; i < npaths; i++) { - GLNVGpath* copy = &gl->paths[call->pathOffset + i]; - const NVGpath* path = &paths[i]; - memset(copy, 0, sizeof(GLNVGpath)); - if (path->nfill > 0) { - copy->fillOffset = offset; - copy->fillCount = path->nfill; - memcpy(&gl->verts[offset], path->fill, sizeof(NVGvertex) * path->nfill); - offset += path->nfill; - } - if (path->nstroke > 0) { - copy->strokeOffset = offset; - copy->strokeCount = path->nstroke; - memcpy(&gl->verts[offset], path->stroke, sizeof(NVGvertex) * path->nstroke); - offset += path->nstroke; - } - } - - // Quad - call->triangleOffset = offset; - call->triangleCount = 6; - quad = &gl->verts[call->triangleOffset]; - glnvg__vset(&quad[0], bounds[0], bounds[3], 0.5f, 1.0f); - glnvg__vset(&quad[1], bounds[2], bounds[3], 0.5f, 1.0f); - glnvg__vset(&quad[2], bounds[2], bounds[1], 0.5f, 1.0f); - - glnvg__vset(&quad[3], bounds[0], bounds[3], 0.5f, 1.0f); - glnvg__vset(&quad[4], bounds[2], bounds[1], 0.5f, 1.0f); - glnvg__vset(&quad[5], bounds[0], bounds[1], 0.5f, 1.0f); - - // Setup uniforms for draw calls - if (call->type == GLNVG_FILL) { - call->uniformOffset = glnvg__allocFragUniforms(gl, 2); - if (call->uniformOffset == -1) goto error; - // Simple shader for stencil - frag = nvg__fragUniformPtr(gl, call->uniformOffset); - memset(frag, 0, sizeof(*frag)); - frag->strokeThr = -1.0f; - frag->type = NSVG_SHADER_SIMPLE; - // Fill shader - glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, fringe, fringe, -1.0f); - } else { - call->uniformOffset = glnvg__allocFragUniforms(gl, 1); - if (call->uniformOffset == -1) goto error; - // Fill shader - glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, fringe, fringe, -1.0f); - } - - return; - -error: - // We get here if call alloc was ok, but something else is not. - // Roll back the last call to prevent drawing it. - if (gl->ncalls > 0) gl->ncalls--; -} - -static void glnvg__renderStroke(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe, - float strokeWidth, const NVGpath* paths, int npaths) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - GLNVGcall* call = glnvg__allocCall(gl); - int i, maxverts, offset; - - if (call == NULL) return; - - call->type = GLNVG_STROKE; - call->pathOffset = glnvg__allocPaths(gl, npaths); - if (call->pathOffset == -1) goto error; - call->pathCount = npaths; - call->image = paint->image; - - // Allocate vertices for all the paths. - maxverts = glnvg__maxVertCount(paths, npaths); - offset = glnvg__allocVerts(gl, maxverts); - if (offset == -1) goto error; - - for (i = 0; i < npaths; i++) { - GLNVGpath* copy = &gl->paths[call->pathOffset + i]; - const NVGpath* path = &paths[i]; - memset(copy, 0, sizeof(GLNVGpath)); - if (path->nstroke) { - copy->strokeOffset = offset; - copy->strokeCount = path->nstroke; - memcpy(&gl->verts[offset], path->stroke, sizeof(NVGvertex) * path->nstroke); - offset += path->nstroke; - } - } - - if (gl->flags & NVG_STENCIL_STROKES) { - // Fill shader - call->uniformOffset = glnvg__allocFragUniforms(gl, 2); - if (call->uniformOffset == -1) goto error; - - glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, strokeWidth, fringe, -1.0f); - glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, strokeWidth, fringe, 1.0f - 0.5f/255.0f); - - } else { - // Fill shader - call->uniformOffset = glnvg__allocFragUniforms(gl, 1); - if (call->uniformOffset == -1) goto error; - glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, strokeWidth, fringe, -1.0f); - } - - return; - -error: - // We get here if call alloc was ok, but something else is not. - // Roll back the last call to prevent drawing it. - if (gl->ncalls > 0) gl->ncalls--; -} - -static void glnvg__renderTriangles(void* uptr, NVGpaint* paint, NVGscissor* scissor, - const NVGvertex* verts, int nverts) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - GLNVGcall* call = glnvg__allocCall(gl); - GLNVGfragUniforms* frag; - - if (call == NULL) return; - - call->type = GLNVG_TRIANGLES; - call->image = paint->image; - - // Allocate vertices for all the paths. - call->triangleOffset = glnvg__allocVerts(gl, nverts); - if (call->triangleOffset == -1) goto error; - call->triangleCount = nverts; - - memcpy(&gl->verts[call->triangleOffset], verts, sizeof(NVGvertex) * nverts); - - // Fill shader - call->uniformOffset = glnvg__allocFragUniforms(gl, 1); - if (call->uniformOffset == -1) goto error; - frag = nvg__fragUniformPtr(gl, call->uniformOffset); - glnvg__convertPaint(gl, frag, paint, scissor, 1.0f, 1.0f, -1.0f); - frag->type = NSVG_SHADER_IMG; - - return; - -error: - // We get here if call alloc was ok, but something else is not. - // Roll back the last call to prevent drawing it. - if (gl->ncalls > 0) gl->ncalls--; -} - -static void glnvg__renderDelete(void* uptr) -{ - GLNVGcontext* gl = (GLNVGcontext*)uptr; - int i; - if (gl == NULL) return; - - glnvg__deleteShader(&gl->shader); - -#if NANOVG_GL3 -#if NANOVG_GL_USE_UNIFORMBUFFER - if (gl->fragBuf != 0) - glDeleteBuffers(1, &gl->fragBuf); -#endif - if (gl->vertArr != 0) - glDeleteVertexArrays(1, &gl->vertArr); -#endif - if (gl->vertBuf != 0) - glDeleteBuffers(1, &gl->vertBuf); - - for (i = 0; i < gl->ntextures; i++) { - if (gl->textures[i].tex != 0 && (gl->textures[i].flags & NVG_IMAGE_NODELETE) == 0) - glDeleteTextures(1, &gl->textures[i].tex); - } - free(gl->textures); - - free(gl->paths); - free(gl->verts); - free(gl->uniforms); - free(gl->calls); - - free(gl); -} - - -#if defined NANOVG_GL2 -NVGcontext* nvgCreateGL2(int flags) -#elif defined NANOVG_GL3 -NVGcontext* nvgCreateGL3(int flags) -#elif defined NANOVG_GLES2 -NVGcontext* nvgCreateGLES2(int flags) -#elif defined NANOVG_GLES3 -NVGcontext* nvgCreateGLES3(int flags) -#endif -{ - NVGparams params; - NVGcontext* ctx = NULL; - GLNVGcontext* gl = (GLNVGcontext*)malloc(sizeof(GLNVGcontext)); - if (gl == NULL) goto error; - memset(gl, 0, sizeof(GLNVGcontext)); - - memset(¶ms, 0, sizeof(params)); - params.renderCreate = glnvg__renderCreate; - params.renderCreateTexture = glnvg__renderCreateTexture; - params.renderDeleteTexture = glnvg__renderDeleteTexture; - params.renderUpdateTexture = glnvg__renderUpdateTexture; - params.renderGetTextureSize = glnvg__renderGetTextureSize; - params.renderViewport = glnvg__renderViewport; - params.renderCancel = glnvg__renderCancel; - params.renderFlush = glnvg__renderFlush; - params.renderFill = glnvg__renderFill; - params.renderStroke = glnvg__renderStroke; - params.renderTriangles = glnvg__renderTriangles; - params.renderDelete = glnvg__renderDelete; - params.userPtr = gl; - params.edgeAntiAlias = flags & NVG_ANTIALIAS ? 1 : 0; - - gl->flags = flags; - - ctx = nvgCreateInternal(¶ms); - if (ctx == NULL) goto error; - - return ctx; - -error: - // 'gl' is freed by nvgDeleteInternal. - if (ctx != NULL) nvgDeleteInternal(ctx); - return NULL; -} - -#if defined NANOVG_GL2 -void nvgDeleteGL2(NVGcontext* ctx) -#elif defined NANOVG_GL3 -void nvgDeleteGL3(NVGcontext* ctx) -#elif defined NANOVG_GLES2 -void nvgDeleteGLES2(NVGcontext* ctx) -#elif defined NANOVG_GLES3 -void nvgDeleteGLES3(NVGcontext* ctx) -#endif -{ - nvgDeleteInternal(ctx); -} - -#if defined NANOVG_GL2 -int nvglCreateImageFromHandleGL2(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags) -#elif defined NANOVG_GL3 -int nvglCreateImageFromHandleGL3(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags) -#elif defined NANOVG_GLES2 -int nvglCreateImageFromHandleGLES2(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags) -#elif defined NANOVG_GLES3 -int nvglCreateImageFromHandleGLES3(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags) -#endif -{ - GLNVGcontext* gl = (GLNVGcontext*)nvgInternalParams(ctx)->userPtr; - GLNVGtexture* tex = glnvg__allocTexture(gl); - - if (tex == NULL) return 0; - - tex->type = NVG_TEXTURE_RGBA; - tex->tex = textureId; - tex->flags = imageFlags; - tex->width = w; - tex->height = h; - - return tex->id; -} - -#if defined NANOVG_GL2 -GLuint nvglImageHandleGL2(NVGcontext* ctx, int image) -#elif defined NANOVG_GL3 -GLuint nvglImageHandleGL3(NVGcontext* ctx, int image) -#elif defined NANOVG_GLES2 -GLuint nvglImageHandleGLES2(NVGcontext* ctx, int image) -#elif defined NANOVG_GLES3 -GLuint nvglImageHandleGLES3(NVGcontext* ctx, int image) -#endif -{ - GLNVGcontext* gl = (GLNVGcontext*)nvgInternalParams(ctx)->userPtr; - GLNVGtexture* tex = glnvg__findTexture(gl, image); - return tex->tex; -} - -#endif /* NANOVG_GL_IMPLEMENTATION */ diff --git a/third_party/nanovg/nanovg_gl_utils.h b/third_party/nanovg/nanovg_gl_utils.h deleted file mode 100644 index 2d8699c4c6..0000000000 --- a/third_party/nanovg/nanovg_gl_utils.h +++ /dev/null @@ -1,143 +0,0 @@ -// -// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org -// -// This software is provided 'as-is', without any express or implied -// warranty. In no event will the authors be held liable for any damages -// arising from the use of this software. -// Permission is granted to anyone to use this software for any purpose, -// including commercial applications, and to alter it and redistribute it -// freely, subject to the following restrictions: -// 1. The origin of this software must not be misrepresented; you must not -// claim that you wrote the original software. If you use this software -// in a product, an acknowledgment in the product documentation would be -// appreciated but is not required. -// 2. Altered source versions must be plainly marked as such, and must not be -// misrepresented as being the original software. -// 3. This notice may not be removed or altered from any source distribution. -// -#ifndef NANOVG_GL_UTILS_H -#define NANOVG_GL_UTILS_H - -struct NVGLUframebuffer { - NVGcontext* ctx; - GLuint fbo; - GLuint rbo; - GLuint texture; - int image; -}; -typedef struct NVGLUframebuffer NVGLUframebuffer; - -// Helper function to create GL frame buffer to render to. -void nvgluBindFramebuffer(NVGLUframebuffer* fb); -NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imageFlags); -void nvgluDeleteFramebuffer(NVGLUframebuffer* fb); - -#endif // NANOVG_GL_UTILS_H - -#ifdef NANOVG_GL_IMPLEMENTATION - -#if defined(NANOVG_GL3) || defined(NANOVG_GLES2) || defined(NANOVG_GLES3) -// FBO is core in OpenGL 3>. -# define NANOVG_FBO_VALID 1 -#elif defined(NANOVG_GL2) -// On OS X including glext defines FBO on GL2 too. -# ifdef __APPLE__ -# include -# define NANOVG_FBO_VALID 1 -# endif -#endif - -static GLint defaultFBO = -1; - -NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imageFlags) -{ -#ifdef NANOVG_FBO_VALID - GLint localDefaultFBO; - GLint defaultRBO; - NVGLUframebuffer* fb = NULL; - - glGetIntegerv(GL_FRAMEBUFFER_BINDING, &localDefaultFBO); - glGetIntegerv(GL_RENDERBUFFER_BINDING, &defaultRBO); - - fb = (NVGLUframebuffer*)malloc(sizeof(NVGLUframebuffer)); - if (fb == NULL) goto error; - memset(fb, 0, sizeof(NVGLUframebuffer)); - - fb->image = nvgCreateImageRGBA(ctx, w, h, imageFlags | NVG_IMAGE_FLIPY | NVG_IMAGE_PREMULTIPLIED, NULL); - -#if defined NANOVG_GL2 - fb->texture = nvglImageHandleGL2(ctx, fb->image); -#elif defined NANOVG_GL3 - fb->texture = nvglImageHandleGL3(ctx, fb->image); -#elif defined NANOVG_GLES2 - fb->texture = nvglImageHandleGLES2(ctx, fb->image); -#elif defined NANOVG_GLES3 - fb->texture = nvglImageHandleGLES3(ctx, fb->image); -#endif - - fb->ctx = ctx; - - // frame buffer object - glGenFramebuffers(1, &fb->fbo); - glBindFramebuffer(GL_FRAMEBUFFER, fb->fbo); - - // render buffer object - glGenRenderbuffers(1, &fb->rbo); - glBindRenderbuffer(GL_RENDERBUFFER, fb->rbo); - glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, w, h); - - // combine all - glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb->texture, 0); - glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fb->rbo); - - if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) goto error; - - glBindFramebuffer(GL_FRAMEBUFFER, localDefaultFBO); - glBindRenderbuffer(GL_RENDERBUFFER, defaultRBO); - return fb; -error: - glBindFramebuffer(GL_FRAMEBUFFER, localDefaultFBO); - glBindRenderbuffer(GL_RENDERBUFFER, defaultRBO); - nvgluDeleteFramebuffer(fb); - return NULL; -#else - NVG_NOTUSED(ctx); - NVG_NOTUSED(w); - NVG_NOTUSED(h); - NVG_NOTUSED(imageFlags); - return NULL; -#endif -} - -void nvgluBindFramebuffer(NVGLUframebuffer* fb) -{ -#ifdef NANOVG_FBO_VALID - if (defaultFBO == -1) glGetIntegerv(GL_FRAMEBUFFER_BINDING, &defaultFBO); - glBindFramebuffer(GL_FRAMEBUFFER, fb != NULL ? fb->fbo : defaultFBO); -#else - NVG_NOTUSED(fb); -#endif -} - -void nvgluDeleteFramebuffer(NVGLUframebuffer* fb) -{ -#ifdef NANOVG_FBO_VALID - if (fb == NULL) return; - if (fb->fbo != 0) - glDeleteFramebuffers(1, &fb->fbo); - if (fb->rbo != 0) - glDeleteRenderbuffers(1, &fb->rbo); - if (fb->image >= 0) - nvgDeleteImage(fb->ctx, fb->image); - fb->ctx = NULL; - fb->fbo = 0; - fb->rbo = 0; - fb->texture = 0; - fb->image = -1; - free(fb); -#else - NVG_NOTUSED(fb); -#endif -} - -#endif // NANOVG_GL_IMPLEMENTATION diff --git a/third_party/nanovg/stb_image.h b/third_party/nanovg/stb_image.h deleted file mode 100644 index e06f7a1d73..0000000000 --- a/third_party/nanovg/stb_image.h +++ /dev/null @@ -1,6614 +0,0 @@ -/* stb_image - v2.10 - public domain image loader - http://nothings.org/stb_image.h - no warranty implied; use at your own risk - - Do this: - #define STB_IMAGE_IMPLEMENTATION - before you include this file in *one* C or C++ file to create the implementation. - - // i.e. it should look like this: - #include ... - #include ... - #include ... - #define STB_IMAGE_IMPLEMENTATION - #include "stb_image.h" - - You can #define STBI_ASSERT(x) before the #include to avoid using assert.h. - And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free - - - QUICK NOTES: - Primarily of interest to game developers and other people who can - avoid problematic images and only need the trivial interface - - JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib) - PNG 1/2/4/8-bit-per-channel (16 bpc not supported) - - TGA (not sure what subset, if a subset) - BMP non-1bpp, non-RLE - PSD (composited view only, no extra channels, 8/16 bit-per-channel) - - GIF (*comp always reports as 4-channel) - HDR (radiance rgbE format) - PIC (Softimage PIC) - PNM (PPM and PGM binary only) - - Animated GIF still needs a proper API, but here's one way to do it: - http://gist.github.com/urraka/685d9a6340b26b830d49 - - - decode from memory or through FILE (define STBI_NO_STDIO to remove code) - - decode from arbitrary I/O callbacks - - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON) - - Full documentation under "DOCUMENTATION" below. - - - Revision 2.00 release notes: - - - Progressive JPEG is now supported. - - - PPM and PGM binary formats are now supported, thanks to Ken Miller. - - - x86 platforms now make use of SSE2 SIMD instructions for - JPEG decoding, and ARM platforms can use NEON SIMD if requested. - This work was done by Fabian "ryg" Giesen. SSE2 is used by - default, but NEON must be enabled explicitly; see docs. - - With other JPEG optimizations included in this version, we see - 2x speedup on a JPEG on an x86 machine, and a 1.5x speedup - on a JPEG on an ARM machine, relative to previous versions of this - library. The same results will not obtain for all JPGs and for all - x86/ARM machines. (Note that progressive JPEGs are significantly - slower to decode than regular JPEGs.) This doesn't mean that this - is the fastest JPEG decoder in the land; rather, it brings it - closer to parity with standard libraries. If you want the fastest - decode, look elsewhere. (See "Philosophy" section of docs below.) - - See final bullet items below for more info on SIMD. - - - Added STBI_MALLOC, STBI_REALLOC, and STBI_FREE macros for replacing - the memory allocator. Unlike other STBI libraries, these macros don't - support a context parameter, so if you need to pass a context in to - the allocator, you'll have to store it in a global or a thread-local - variable. - - - Split existing STBI_NO_HDR flag into two flags, STBI_NO_HDR and - STBI_NO_LINEAR. - STBI_NO_HDR: suppress implementation of .hdr reader format - STBI_NO_LINEAR: suppress high-dynamic-range light-linear float API - - - You can suppress implementation of any of the decoders to reduce - your code footprint by #defining one or more of the following - symbols before creating the implementation. - - STBI_NO_JPEG - STBI_NO_PNG - STBI_NO_BMP - STBI_NO_PSD - STBI_NO_TGA - STBI_NO_GIF - STBI_NO_HDR - STBI_NO_PIC - STBI_NO_PNM (.ppm and .pgm) - - - You can request *only* certain decoders and suppress all other ones - (this will be more forward-compatible, as addition of new decoders - doesn't require you to disable them explicitly): - - STBI_ONLY_JPEG - STBI_ONLY_PNG - STBI_ONLY_BMP - STBI_ONLY_PSD - STBI_ONLY_TGA - STBI_ONLY_GIF - STBI_ONLY_HDR - STBI_ONLY_PIC - STBI_ONLY_PNM (.ppm and .pgm) - - Note that you can define multiples of these, and you will get all - of them ("only x" and "only y" is interpreted to mean "only x&y"). - - - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still - want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB - - - Compilation of all SIMD code can be suppressed with - #define STBI_NO_SIMD - It should not be necessary to disable SIMD unless you have issues - compiling (e.g. using an x86 compiler which doesn't support SSE - intrinsics or that doesn't support the method used to detect - SSE2 support at run-time), and even those can be reported as - bugs so I can refine the built-in compile-time checking to be - smarter. - - - The old STBI_SIMD system which allowed installing a user-defined - IDCT etc. has been removed. If you need this, don't upgrade. My - assumption is that almost nobody was doing this, and those who - were will find the built-in SIMD more satisfactory anyway. - - - RGB values computed for JPEG images are slightly different from - previous versions of stb_image. (This is due to using less - integer precision in SIMD.) The C code has been adjusted so - that the same RGB values will be computed regardless of whether - SIMD support is available, so your app should always produce - consistent results. But these results are slightly different from - previous versions. (Specifically, about 3% of available YCbCr values - will compute different RGB results from pre-1.49 versions by +-1; - most of the deviating values are one smaller in the G channel.) - - - If you must produce consistent results with previous versions of - stb_image, #define STBI_JPEG_OLD and you will get the same results - you used to; however, you will not get the SIMD speedups for - the YCbCr-to-RGB conversion step (although you should still see - significant JPEG speedup from the other changes). - - Please note that STBI_JPEG_OLD is a temporary feature; it will be - removed in future versions of the library. It is only intended for - near-term back-compatibility use. - - - Latest revision history: - 2.10 (2016-01-22) avoid warning introduced in 2.09 - 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED - 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA - 2.07 (2015-09-13) partial animated GIF support - limited 16-bit PSD support - minor bugs, code cleanup, and compiler warnings - 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value - 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning - 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit - 2.03 (2015-04-12) additional corruption checking - stbi_set_flip_vertically_on_load - fix NEON support; fix mingw support - 2.02 (2015-01-19) fix incorrect assert, fix warning - 2.01 (2015-01-17) fix various warnings - 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG - 2.00 (2014-12-25) optimize JPEG, including x86 SSE2 & ARM NEON SIMD - progressive JPEG - PGM/PPM support - STBI_MALLOC,STBI_REALLOC,STBI_FREE - STBI_NO_*, STBI_ONLY_* - GIF bugfix - 1.48 (2014-12-14) fix incorrectly-named assert() - 1.47 (2014-12-14) 1/2/4-bit PNG support (both grayscale and paletted) - optimize PNG - fix bug in interlaced PNG with user-specified channel count - - See end of file for full revision history. - - - ============================ Contributors ========================= - - Image formats Extensions, features - Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info) - Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info) - Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG) - Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks) - Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG) - Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip) - Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD) - urraka@github (animated gif) Junggon Kim (PNM comments) - Daniel Gibson (16-bit TGA) - - Optimizations & bugfixes - Fabian "ryg" Giesen - Arseny Kapoulkine - - Bug & warning fixes - Marc LeBlanc David Woo Guillaume George Martins Mozeiko - Christpher Lloyd Martin Golini Jerry Jansson Joseph Thomson - Dave Moore Roy Eltham Hayaki Saito Phil Jordan - Won Chun Luke Graham Johan Duparc Nathan Reed - the Horde3D community Thomas Ruf Ronny Chevalier Nick Verigakis - Janez Zemva John Bartholomew Michal Cichon svdijk@github - Jonathan Blow Ken Hamada Tero Hanninen Baldur Karlsson - Laurent Gomila Cort Stratton Sergio Gonzalez romigrou@github - Aruelien Pocheville Thibault Reuille Cass Everitt - Ryamond Barbiero Paul Du Bois Engin Manap - Blazej Dariusz Roszkowski - Michaelangel007@github - - -LICENSE - -This software is in the public domain. Where that dedication is not -recognized, you are granted a perpetual, irrevocable license to copy, -distribute, and modify this file as you see fit. - -*/ - -#ifndef STBI_INCLUDE_STB_IMAGE_H -#define STBI_INCLUDE_STB_IMAGE_H - -// DOCUMENTATION -// -// Limitations: -// - no 16-bit-per-channel PNG -// - no 12-bit-per-channel JPEG -// - no JPEGs with arithmetic coding -// - no 1-bit BMP -// - GIF always returns *comp=4 -// -// Basic usage (see HDR discussion below for HDR usage): -// int x,y,n; -// unsigned char *data = stbi_load(filename, &x, &y, &n, 0); -// // ... process data if not NULL ... -// // ... x = width, y = height, n = # 8-bit components per pixel ... -// // ... replace '0' with '1'..'4' to force that many components per pixel -// // ... but 'n' will always be the number that it would have been if you said 0 -// stbi_image_free(data) -// -// Standard parameters: -// int *x -- outputs image width in pixels -// int *y -- outputs image height in pixels -// int *comp -- outputs # of image components in image file -// int req_comp -- if non-zero, # of image components requested in result -// -// The return value from an image loader is an 'unsigned char *' which points -// to the pixel data, or NULL on an allocation failure or if the image is -// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels, -// with each pixel consisting of N interleaved 8-bit components; the first -// pixel pointed to is top-left-most in the image. There is no padding between -// image scanlines or between pixels, regardless of format. The number of -// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise. -// If req_comp is non-zero, *comp has the number of components that _would_ -// have been output otherwise. E.g. if you set req_comp to 4, you will always -// get RGBA output, but you can check *comp to see if it's trivially opaque -// because e.g. there were only 3 channels in the source image. -// -// An output image with N components has the following components interleaved -// in this order in each pixel: -// -// N=#comp components -// 1 grey -// 2 grey, alpha -// 3 red, green, blue -// 4 red, green, blue, alpha -// -// If image loading fails for any reason, the return value will be NULL, -// and *x, *y, *comp will be unchanged. The function stbi_failure_reason() -// can be queried for an extremely brief, end-user unfriendly explanation -// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid -// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly -// more user-friendly ones. -// -// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized. -// -// =========================================================================== -// -// Philosophy -// -// stb libraries are designed with the following priorities: -// -// 1. easy to use -// 2. easy to maintain -// 3. good performance -// -// Sometimes I let "good performance" creep up in priority over "easy to maintain", -// and for best performance I may provide less-easy-to-use APIs that give higher -// performance, in addition to the easy to use ones. Nevertheless, it's important -// to keep in mind that from the standpoint of you, a client of this library, -// all you care about is #1 and #3, and stb libraries do not emphasize #3 above all. -// -// Some secondary priorities arise directly from the first two, some of which -// make more explicit reasons why performance can't be emphasized. -// -// - Portable ("ease of use") -// - Small footprint ("easy to maintain") -// - No dependencies ("ease of use") -// -// =========================================================================== -// -// I/O callbacks -// -// I/O callbacks allow you to read from arbitrary sources, like packaged -// files or some other source. Data read from callbacks are processed -// through a small internal buffer (currently 128 bytes) to try to reduce -// overhead. -// -// The three functions you must define are "read" (reads some bytes of data), -// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). -// -// =========================================================================== -// -// SIMD support -// -// The JPEG decoder will try to automatically use SIMD kernels on x86 when -// supported by the compiler. For ARM Neon support, you must explicitly -// request it. -// -// (The old do-it-yourself SIMD API is no longer supported in the current -// code.) -// -// On x86, SSE2 will automatically be used when available based on a run-time -// test; if not, the generic C versions are used as a fall-back. On ARM targets, -// the typical path is to have separate builds for NEON and non-NEON devices -// (at least this is true for iOS and Android). Therefore, the NEON support is -// toggled by a build flag: define STBI_NEON to get NEON loops. -// -// The output of the JPEG decoder is slightly different from versions where -// SIMD support was introduced (that is, for versions before 1.49). The -// difference is only +-1 in the 8-bit RGB channels, and only on a small -// fraction of pixels. You can force the pre-1.49 behavior by defining -// STBI_JPEG_OLD, but this will disable some of the SIMD decoding path -// and hence cost some performance. -// -// If for some reason you do not want to use any of SIMD code, or if -// you have issues compiling it, you can disable it entirely by -// defining STBI_NO_SIMD. -// -// =========================================================================== -// -// HDR image support (disable by defining STBI_NO_HDR) -// -// stb_image now supports loading HDR images in general, and currently -// the Radiance .HDR file format, although the support is provided -// generically. You can still load any file through the existing interface; -// if you attempt to load an HDR file, it will be automatically remapped to -// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1; -// both of these constants can be reconfigured through this interface: -// -// stbi_hdr_to_ldr_gamma(2.2f); -// stbi_hdr_to_ldr_scale(1.0f); -// -// (note, do not use _inverse_ constants; stbi_image will invert them -// appropriately). -// -// Additionally, there is a new, parallel interface for loading files as -// (linear) floats to preserve the full dynamic range: -// -// float *data = stbi_loadf(filename, &x, &y, &n, 0); -// -// If you load LDR images through this interface, those images will -// be promoted to floating point values, run through the inverse of -// constants corresponding to the above: -// -// stbi_ldr_to_hdr_scale(1.0f); -// stbi_ldr_to_hdr_gamma(2.2f); -// -// Finally, given a filename (or an open file or memory block--see header -// file for details) containing image data, you can query for the "most -// appropriate" interface to use (that is, whether the image is HDR or -// not), using: -// -// stbi_is_hdr(char *filename); -// -// =========================================================================== -// -// iPhone PNG support: -// -// By default we convert iphone-formatted PNGs back to RGB, even though -// they are internally encoded differently. You can disable this conversion -// by by calling stbi_convert_iphone_png_to_rgb(0), in which case -// you will always just get the native iphone "format" through (which -// is BGR stored in RGB). -// -// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per -// pixel to remove any premultiplied alpha *only* if the image file explicitly -// says there's premultiplied data (currently only happens in iPhone images, -// and only if iPhone convert-to-rgb processing is on). -// - - -#ifndef STBI_NO_STDIO -#include -#endif // STBI_NO_STDIO - -#define STBI_VERSION 1 - -enum -{ - STBI_default = 0, // only used for req_comp - - STBI_grey = 1, - STBI_grey_alpha = 2, - STBI_rgb = 3, - STBI_rgb_alpha = 4 -}; - -typedef unsigned char stbi_uc; - -#ifdef __cplusplus -extern "C" { -#endif - -#ifdef STB_IMAGE_STATIC -#define STBIDEF static -#else -#define STBIDEF extern -#endif - -////////////////////////////////////////////////////////////////////////////// -// -// PRIMARY API - works on images of any type -// - -// -// load image by filename, open file, or memory buffer -// - -typedef struct -{ - int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read - void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative - int (*eof) (void *user); // returns nonzero if we are at end of file/data -} stbi_io_callbacks; - -STBIDEF stbi_uc *stbi_load (char const *filename, int *x, int *y, int *comp, int req_comp); -STBIDEF stbi_uc *stbi_load_from_memory (stbi_uc const *buffer, int len , int *x, int *y, int *comp, int req_comp); -STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *comp, int req_comp); - -#ifndef STBI_NO_STDIO -STBIDEF stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); -// for stbi_load_from_file, file pointer is left pointing immediately after image -#endif - -#ifndef STBI_NO_LINEAR - STBIDEF float *stbi_loadf (char const *filename, int *x, int *y, int *comp, int req_comp); - STBIDEF float *stbi_loadf_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); - STBIDEF float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp); - - #ifndef STBI_NO_STDIO - STBIDEF float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); - #endif -#endif - -#ifndef STBI_NO_HDR - STBIDEF void stbi_hdr_to_ldr_gamma(float gamma); - STBIDEF void stbi_hdr_to_ldr_scale(float scale); -#endif // STBI_NO_HDR - -#ifndef STBI_NO_LINEAR - STBIDEF void stbi_ldr_to_hdr_gamma(float gamma); - STBIDEF void stbi_ldr_to_hdr_scale(float scale); -#endif // STBI_NO_LINEAR - -// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR -STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user); -STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len); -#ifndef STBI_NO_STDIO -STBIDEF int stbi_is_hdr (char const *filename); -STBIDEF int stbi_is_hdr_from_file(FILE *f); -#endif // STBI_NO_STDIO - - -// get a VERY brief reason for failure -// NOT THREADSAFE -STBIDEF const char *stbi_failure_reason (void); - -// free the loaded image -- this is just free() -STBIDEF void stbi_image_free (void *retval_from_stbi_load); - -// get image dimensions & components without fully decoding -STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); -STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp); - -#ifndef STBI_NO_STDIO -STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp); -STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); - -#endif - - - -// for image formats that explicitly notate that they have premultiplied alpha, -// we just return the colors as stored in the file. set this flag to force -// unpremultiplication. results are undefined if the unpremultiply overflow. -STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply); - -// indicate whether we should process iphone images back to canonical format, -// or just pass them through "as-is" -STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert); - -// flip the image vertically, so the first pixel in the output array is the bottom left -STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip); - -// ZLIB client - used by PNG, available for other purposes - -STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen); -STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header); -STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen); -STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); - -STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen); -STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); - - -#ifdef __cplusplus -} -#endif - -// -// -//// end header file ///////////////////////////////////////////////////// -#endif // STBI_INCLUDE_STB_IMAGE_H - -#ifdef STB_IMAGE_IMPLEMENTATION - -#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \ - || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \ - || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \ - || defined(STBI_ONLY_ZLIB) - #ifndef STBI_ONLY_JPEG - #define STBI_NO_JPEG - #endif - #ifndef STBI_ONLY_PNG - #define STBI_NO_PNG - #endif - #ifndef STBI_ONLY_BMP - #define STBI_NO_BMP - #endif - #ifndef STBI_ONLY_PSD - #define STBI_NO_PSD - #endif - #ifndef STBI_ONLY_TGA - #define STBI_NO_TGA - #endif - #ifndef STBI_ONLY_GIF - #define STBI_NO_GIF - #endif - #ifndef STBI_ONLY_HDR - #define STBI_NO_HDR - #endif - #ifndef STBI_ONLY_PIC - #define STBI_NO_PIC - #endif - #ifndef STBI_ONLY_PNM - #define STBI_NO_PNM - #endif -#endif - -#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB) -#define STBI_NO_ZLIB -#endif - - -#include -#include // ptrdiff_t on osx -#include -#include - -#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) -#include // ldexp -#endif - -#ifndef STBI_NO_STDIO -#include -#endif - -#ifndef STBI_ASSERT -#include -#define STBI_ASSERT(x) assert(x) -#endif - - -#ifndef _MSC_VER - #ifdef __cplusplus - #define stbi_inline inline - #else - #define stbi_inline - #endif -#else - #define stbi_inline __forceinline -#endif - - -#ifdef _MSC_VER -typedef unsigned short stbi__uint16; -typedef signed short stbi__int16; -typedef unsigned int stbi__uint32; -typedef signed int stbi__int32; -#else -#include -typedef uint16_t stbi__uint16; -typedef int16_t stbi__int16; -typedef uint32_t stbi__uint32; -typedef int32_t stbi__int32; -#endif - -// should produce compiler error if size is wrong -typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1]; - -#ifdef _MSC_VER -#define STBI_NOTUSED(v) (void)(v) -#else -#define STBI_NOTUSED(v) (void)sizeof(v) -#endif - -#ifdef _MSC_VER -#define STBI_HAS_LROTL -#endif - -#ifdef STBI_HAS_LROTL - #define stbi_lrot(x,y) _lrotl(x,y) -#else - #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y)))) -#endif - -#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED)) -// ok -#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED) -// ok -#else -#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)." -#endif - -#ifndef STBI_MALLOC -#define STBI_MALLOC(sz) malloc(sz) -#define STBI_REALLOC(p,newsz) realloc(p,newsz) -#define STBI_FREE(p) free(p) -#endif - -#ifndef STBI_REALLOC_SIZED -#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz) -#endif - -// x86/x64 detection -#if defined(__x86_64__) || defined(_M_X64) -#define STBI__X64_TARGET -#elif defined(__i386) || defined(_M_IX86) -#define STBI__X86_TARGET -#endif - -#if defined(__GNUC__) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) -// NOTE: not clear do we actually need this for the 64-bit path? -// gcc doesn't support sse2 intrinsics unless you compile with -msse2, -// (but compiling with -msse2 allows the compiler to use SSE2 everywhere; -// this is just broken and gcc are jerks for not fixing it properly -// http://www.virtualdub.org/blog/pivot/entry.php?id=363 ) -#define STBI_NO_SIMD -#endif - -#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD) -// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET -// -// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the -// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant. -// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not -// simultaneously enabling "-mstackrealign". -// -// See https://github.com/nothings/stb/issues/81 for more information. -// -// So default to no SSE2 on 32-bit MinGW. If you've read this far and added -// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2. -#define STBI_NO_SIMD -#endif - -#if !defined(STBI_NO_SIMD) && defined(STBI__X86_TARGET) -#define STBI_SSE2 -#include - -#ifdef _MSC_VER - -#if _MSC_VER >= 1400 // not VC6 -#include // __cpuid -static int stbi__cpuid3(void) -{ - int info[4]; - __cpuid(info,1); - return info[3]; -} -#else -static int stbi__cpuid3(void) -{ - int res; - __asm { - mov eax,1 - cpuid - mov res,edx - } - return res; -} -#endif - -#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name - -static int stbi__sse2_available() -{ - int info3 = stbi__cpuid3(); - return ((info3 >> 26) & 1) != 0; -} -#else // assume GCC-style if not VC++ -#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) - -static int stbi__sse2_available() -{ -#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later - // GCC 4.8+ has a nice way to do this - return __builtin_cpu_supports("sse2"); -#else - // portable way to do this, preferably without using GCC inline ASM? - // just bail for now. - return 0; -#endif -} -#endif -#endif - -// ARM NEON -#if defined(STBI_NO_SIMD) && defined(STBI_NEON) -#undef STBI_NEON -#endif - -#ifdef STBI_NEON -#include -// assume GCC or Clang on ARM targets -#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) -#endif - -#ifndef STBI_SIMD_ALIGN -#define STBI_SIMD_ALIGN(type, name) type name -#endif - -/////////////////////////////////////////////// -// -// stbi__context struct and start_xxx functions - -// stbi__context structure is our basic context used by all images, so it -// contains all the IO context, plus some basic image information -typedef struct -{ - stbi__uint32 img_x, img_y; - int img_n, img_out_n; - - stbi_io_callbacks io; - void *io_user_data; - - int read_from_callbacks; - int buflen; - stbi_uc buffer_start[128]; - - stbi_uc *img_buffer, *img_buffer_end; - stbi_uc *img_buffer_original, *img_buffer_original_end; -} stbi__context; - - -static void stbi__refill_buffer(stbi__context *s); - -// initialize a memory-decode context -static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len) -{ - s->io.read = NULL; - s->read_from_callbacks = 0; - s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer; - s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len; -} - -// initialize a callback-based context -static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user) -{ - s->io = *c; - s->io_user_data = user; - s->buflen = sizeof(s->buffer_start); - s->read_from_callbacks = 1; - s->img_buffer_original = s->buffer_start; - stbi__refill_buffer(s); - s->img_buffer_original_end = s->img_buffer_end; -} - -#ifndef STBI_NO_STDIO - -static int stbi__stdio_read(void *user, char *data, int size) -{ - return (int) fread(data,1,size,(FILE*) user); -} - -static void stbi__stdio_skip(void *user, int n) -{ - fseek((FILE*) user, n, SEEK_CUR); -} - -static int stbi__stdio_eof(void *user) -{ - return feof((FILE*) user); -} - -static stbi_io_callbacks stbi__stdio_callbacks = -{ - stbi__stdio_read, - stbi__stdio_skip, - stbi__stdio_eof, -}; - -static void stbi__start_file(stbi__context *s, FILE *f) -{ - stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f); -} - -//static void stop_file(stbi__context *s) { } - -#endif // !STBI_NO_STDIO - -static void stbi__rewind(stbi__context *s) -{ - // conceptually rewind SHOULD rewind to the beginning of the stream, - // but we just rewind to the beginning of the initial buffer, because - // we only use it after doing 'test', which only ever looks at at most 92 bytes - s->img_buffer = s->img_buffer_original; - s->img_buffer_end = s->img_buffer_original_end; -} - -#ifndef STBI_NO_JPEG -static int stbi__jpeg_test(stbi__context *s); -static stbi_uc *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); -static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_PNG -static int stbi__png_test(stbi__context *s); -static stbi_uc *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); -static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_BMP -static int stbi__bmp_test(stbi__context *s); -static stbi_uc *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); -static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_TGA -static int stbi__tga_test(stbi__context *s); -static stbi_uc *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); -static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_PSD -static int stbi__psd_test(stbi__context *s); -static stbi_uc *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); -static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_HDR -static int stbi__hdr_test(stbi__context *s); -static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); -static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_PIC -static int stbi__pic_test(stbi__context *s); -static stbi_uc *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); -static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_GIF -static int stbi__gif_test(stbi__context *s); -static stbi_uc *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); -static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp); -#endif - -#ifndef STBI_NO_PNM -static int stbi__pnm_test(stbi__context *s); -static stbi_uc *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp); -static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp); -#endif - -// this is not threadsafe -static const char *stbi__g_failure_reason; - -STBIDEF const char *stbi_failure_reason(void) -{ - return stbi__g_failure_reason; -} - -static int stbi__err(const char *str) -{ - stbi__g_failure_reason = str; - return 0; -} - -static void *stbi__malloc(size_t size) -{ - return STBI_MALLOC(size); -} - -// stbi__err - error -// stbi__errpf - error returning pointer to float -// stbi__errpuc - error returning pointer to unsigned char - -#ifdef STBI_NO_FAILURE_STRINGS - #define stbi__err(x,y) 0 -#elif defined(STBI_FAILURE_USERMSG) - #define stbi__err(x,y) stbi__err(y) -#else - #define stbi__err(x,y) stbi__err(x) -#endif - -#define stbi__errpf(x,y) ((float *)(size_t) (stbi__err(x,y)?NULL:NULL)) -#define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL)) - -STBIDEF void stbi_image_free(void *retval_from_stbi_load) -{ - STBI_FREE(retval_from_stbi_load); -} - -#ifndef STBI_NO_LINEAR -static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp); -#endif - -#ifndef STBI_NO_HDR -static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp); -#endif - -static int stbi__vertically_flip_on_load = 0; - -STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip) -{ - stbi__vertically_flip_on_load = flag_true_if_should_flip; -} - -static unsigned char *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - #ifndef STBI_NO_JPEG - if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp); - #endif - #ifndef STBI_NO_PNG - if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp); - #endif - #ifndef STBI_NO_BMP - if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp); - #endif - #ifndef STBI_NO_GIF - if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp); - #endif - #ifndef STBI_NO_PSD - if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp); - #endif - #ifndef STBI_NO_PIC - if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp); - #endif - #ifndef STBI_NO_PNM - if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp); - #endif - - #ifndef STBI_NO_HDR - if (stbi__hdr_test(s)) { - float *hdr = stbi__hdr_load(s, x,y,comp,req_comp); - return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); - } - #endif - - #ifndef STBI_NO_TGA - // test tga last because it's a crappy test! - if (stbi__tga_test(s)) - return stbi__tga_load(s,x,y,comp,req_comp); - #endif - - return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt"); -} - -static unsigned char *stbi__load_flip(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *result = stbi__load_main(s, x, y, comp, req_comp); - - if (stbi__vertically_flip_on_load && result != NULL) { - int w = *x, h = *y; - int depth = req_comp ? req_comp : *comp; - int row,col,z; - stbi_uc temp; - - // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once - for (row = 0; row < (h>>1); row++) { - for (col = 0; col < w; col++) { - for (z = 0; z < depth; z++) { - temp = result[(row * w + col) * depth + z]; - result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z]; - result[((h - row - 1) * w + col) * depth + z] = temp; - } - } - } - } - - return result; -} - -#ifndef STBI_NO_HDR -static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp) -{ - if (stbi__vertically_flip_on_load && result != NULL) { - int w = *x, h = *y; - int depth = req_comp ? req_comp : *comp; - int row,col,z; - float temp; - - // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once - for (row = 0; row < (h>>1); row++) { - for (col = 0; col < w; col++) { - for (z = 0; z < depth; z++) { - temp = result[(row * w + col) * depth + z]; - result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z]; - result[((h - row - 1) * w + col) * depth + z] = temp; - } - } - } - } -} -#endif - -#ifndef STBI_NO_STDIO - -static FILE *stbi__fopen(char const *filename, char const *mode) -{ - FILE *f; -#if defined(_MSC_VER) && _MSC_VER >= 1400 - if (0 != fopen_s(&f, filename, mode)) - f=0; -#else - f = fopen(filename, mode); -#endif - return f; -} - - -STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - FILE *f = stbi__fopen(filename, "rb"); - unsigned char *result; - if (!f) return stbi__errpuc("can't fopen", "Unable to open file"); - result = stbi_load_from_file(f,x,y,comp,req_comp); - fclose(f); - return result; -} - -STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *result; - stbi__context s; - stbi__start_file(&s,f); - result = stbi__load_flip(&s,x,y,comp,req_comp); - if (result) { - // need to 'unget' all the characters in the IO buffer - fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); - } - return result; -} -#endif //!STBI_NO_STDIO - -STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - stbi__context s; - stbi__start_mem(&s,buffer,len); - return stbi__load_flip(&s,x,y,comp,req_comp); -} - -STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) -{ - stbi__context s; - stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); - return stbi__load_flip(&s,x,y,comp,req_comp); -} - -#ifndef STBI_NO_LINEAR -static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *data; - #ifndef STBI_NO_HDR - if (stbi__hdr_test(s)) { - float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp); - if (hdr_data) - stbi__float_postprocess(hdr_data,x,y,comp,req_comp); - return hdr_data; - } - #endif - data = stbi__load_flip(s, x, y, comp, req_comp); - if (data) - return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); - return stbi__errpf("unknown image type", "Image not of any known type, or corrupt"); -} - -STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - stbi__context s; - stbi__start_mem(&s,buffer,len); - return stbi__loadf_main(&s,x,y,comp,req_comp); -} - -STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) -{ - stbi__context s; - stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); - return stbi__loadf_main(&s,x,y,comp,req_comp); -} - -#ifndef STBI_NO_STDIO -STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) -{ - float *result; - FILE *f = stbi__fopen(filename, "rb"); - if (!f) return stbi__errpf("can't fopen", "Unable to open file"); - result = stbi_loadf_from_file(f,x,y,comp,req_comp); - fclose(f); - return result; -} - -STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - stbi__context s; - stbi__start_file(&s,f); - return stbi__loadf_main(&s,x,y,comp,req_comp); -} -#endif // !STBI_NO_STDIO - -#endif // !STBI_NO_LINEAR - -// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is -// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always -// reports false! - -STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) -{ - #ifndef STBI_NO_HDR - stbi__context s; - stbi__start_mem(&s,buffer,len); - return stbi__hdr_test(&s); - #else - STBI_NOTUSED(buffer); - STBI_NOTUSED(len); - return 0; - #endif -} - -#ifndef STBI_NO_STDIO -STBIDEF int stbi_is_hdr (char const *filename) -{ - FILE *f = stbi__fopen(filename, "rb"); - int result=0; - if (f) { - result = stbi_is_hdr_from_file(f); - fclose(f); - } - return result; -} - -STBIDEF int stbi_is_hdr_from_file(FILE *f) -{ - #ifndef STBI_NO_HDR - stbi__context s; - stbi__start_file(&s,f); - return stbi__hdr_test(&s); - #else - STBI_NOTUSED(f); - return 0; - #endif -} -#endif // !STBI_NO_STDIO - -STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user) -{ - #ifndef STBI_NO_HDR - stbi__context s; - stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); - return stbi__hdr_test(&s); - #else - STBI_NOTUSED(clbk); - STBI_NOTUSED(user); - return 0; - #endif -} - -#ifndef STBI_NO_LINEAR -static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f; - -STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; } -STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; } -#endif - -static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f; - -STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; } -STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; } - - -////////////////////////////////////////////////////////////////////////////// -// -// Common code used by all image loaders -// - -enum -{ - STBI__SCAN_load=0, - STBI__SCAN_type, - STBI__SCAN_header -}; - -static void stbi__refill_buffer(stbi__context *s) -{ - int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen); - if (n == 0) { - // at end of file, treat same as if from memory, but need to handle case - // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file - s->read_from_callbacks = 0; - s->img_buffer = s->buffer_start; - s->img_buffer_end = s->buffer_start+1; - *s->img_buffer = 0; - } else { - s->img_buffer = s->buffer_start; - s->img_buffer_end = s->buffer_start + n; - } -} - -stbi_inline static stbi_uc stbi__get8(stbi__context *s) -{ - if (s->img_buffer < s->img_buffer_end) - return *s->img_buffer++; - if (s->read_from_callbacks) { - stbi__refill_buffer(s); - return *s->img_buffer++; - } - return 0; -} - -stbi_inline static int stbi__at_eof(stbi__context *s) -{ - if (s->io.read) { - if (!(s->io.eof)(s->io_user_data)) return 0; - // if feof() is true, check if buffer = end - // special case: we've only got the special 0 character at the end - if (s->read_from_callbacks == 0) return 1; - } - - return s->img_buffer >= s->img_buffer_end; -} - -static void stbi__skip(stbi__context *s, int n) -{ - if (n < 0) { - s->img_buffer = s->img_buffer_end; - return; - } - if (s->io.read) { - int blen = (int) (s->img_buffer_end - s->img_buffer); - if (blen < n) { - s->img_buffer = s->img_buffer_end; - (s->io.skip)(s->io_user_data, n - blen); - return; - } - } - s->img_buffer += n; -} - -static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n) -{ - if (s->io.read) { - int blen = (int) (s->img_buffer_end - s->img_buffer); - if (blen < n) { - int res, count; - - memcpy(buffer, s->img_buffer, blen); - - count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen); - res = (count == (n-blen)); - s->img_buffer = s->img_buffer_end; - return res; - } - } - - if (s->img_buffer+n <= s->img_buffer_end) { - memcpy(buffer, s->img_buffer, n); - s->img_buffer += n; - return 1; - } else - return 0; -} - -static int stbi__get16be(stbi__context *s) -{ - int z = stbi__get8(s); - return (z << 8) + stbi__get8(s); -} - -static stbi__uint32 stbi__get32be(stbi__context *s) -{ - stbi__uint32 z = stbi__get16be(s); - return (z << 16) + stbi__get16be(s); -} - -#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) -// nothing -#else -static int stbi__get16le(stbi__context *s) -{ - int z = stbi__get8(s); - return z + (stbi__get8(s) << 8); -} -#endif - -#ifndef STBI_NO_BMP -static stbi__uint32 stbi__get32le(stbi__context *s) -{ - stbi__uint32 z = stbi__get16le(s); - return z + (stbi__get16le(s) << 16); -} -#endif - -#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings - - -////////////////////////////////////////////////////////////////////////////// -// -// generic converter from built-in img_n to req_comp -// individual types do this automatically as much as possible (e.g. jpeg -// does all cases internally since it needs to colorspace convert anyway, -// and it never has alpha, so very few cases ). png can automatically -// interleave an alpha=255 channel, but falls back to this for other cases -// -// assume data buffer is malloced, so malloc a new one and free that one -// only failure mode is malloc failing - -static stbi_uc stbi__compute_y(int r, int g, int b) -{ - return (stbi_uc) (((r*77) + (g*150) + (29*b)) >> 8); -} - -static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y) -{ - int i,j; - unsigned char *good; - - if (req_comp == img_n) return data; - STBI_ASSERT(req_comp >= 1 && req_comp <= 4); - - good = (unsigned char *) stbi__malloc(req_comp * x * y); - if (good == NULL) { - STBI_FREE(data); - return stbi__errpuc("outofmem", "Out of memory"); - } - - for (j=0; j < (int) y; ++j) { - unsigned char *src = data + j * x * img_n ; - unsigned char *dest = good + j * x * req_comp; - - #define COMBO(a,b) ((a)*8+(b)) - #define CASE(a,b) case COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) - // convert source image with img_n components to one with req_comp components; - // avoid switch per pixel, so use switch per scanline and massive macros - switch (COMBO(img_n, req_comp)) { - CASE(1,2) dest[0]=src[0], dest[1]=255; break; - CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break; - CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break; - CASE(2,1) dest[0]=src[0]; break; - CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break; - CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break; - CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break; - CASE(3,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break; - CASE(3,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = 255; break; - CASE(4,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break; - CASE(4,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break; - CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break; - default: STBI_ASSERT(0); - } - #undef CASE - } - - STBI_FREE(data); - return good; -} - -#ifndef STBI_NO_LINEAR -static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp) -{ - int i,k,n; - float *output = (float *) stbi__malloc(x * y * comp * sizeof(float)); - if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); } - // compute number of non-alpha components - if (comp & 1) n = comp; else n = comp-1; - for (i=0; i < x*y; ++i) { - for (k=0; k < n; ++k) { - output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale); - } - if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f; - } - STBI_FREE(data); - return output; -} -#endif - -#ifndef STBI_NO_HDR -#define stbi__float2int(x) ((int) (x)) -static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp) -{ - int i,k,n; - stbi_uc *output = (stbi_uc *) stbi__malloc(x * y * comp); - if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); } - // compute number of non-alpha components - if (comp & 1) n = comp; else n = comp-1; - for (i=0; i < x*y; ++i) { - for (k=0; k < n; ++k) { - float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f; - if (z < 0) z = 0; - if (z > 255) z = 255; - output[i*comp + k] = (stbi_uc) stbi__float2int(z); - } - if (k < comp) { - float z = data[i*comp+k] * 255 + 0.5f; - if (z < 0) z = 0; - if (z > 255) z = 255; - output[i*comp + k] = (stbi_uc) stbi__float2int(z); - } - } - STBI_FREE(data); - return output; -} -#endif - -////////////////////////////////////////////////////////////////////////////// -// -// "baseline" JPEG/JFIF decoder -// -// simple implementation -// - doesn't support delayed output of y-dimension -// - simple interface (only one output format: 8-bit interleaved RGB) -// - doesn't try to recover corrupt jpegs -// - doesn't allow partial loading, loading multiple at once -// - still fast on x86 (copying globals into locals doesn't help x86) -// - allocates lots of intermediate memory (full size of all components) -// - non-interleaved case requires this anyway -// - allows good upsampling (see next) -// high-quality -// - upsampled channels are bilinearly interpolated, even across blocks -// - quality integer IDCT derived from IJG's 'slow' -// performance -// - fast huffman; reasonable integer IDCT -// - some SIMD kernels for common paths on targets with SSE2/NEON -// - uses a lot of intermediate memory, could cache poorly - -#ifndef STBI_NO_JPEG - -// huffman decoding acceleration -#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache - -typedef struct -{ - stbi_uc fast[1 << FAST_BITS]; - // weirdly, repacking this into AoS is a 10% speed loss, instead of a win - stbi__uint16 code[256]; - stbi_uc values[256]; - stbi_uc size[257]; - unsigned int maxcode[18]; - int delta[17]; // old 'firstsymbol' - old 'firstcode' -} stbi__huffman; - -typedef struct -{ - stbi__context *s; - stbi__huffman huff_dc[4]; - stbi__huffman huff_ac[4]; - stbi_uc dequant[4][64]; - stbi__int16 fast_ac[4][1 << FAST_BITS]; - -// sizes for components, interleaved MCUs - int img_h_max, img_v_max; - int img_mcu_x, img_mcu_y; - int img_mcu_w, img_mcu_h; - -// definition of jpeg image component - struct - { - int id; - int h,v; - int tq; - int hd,ha; - int dc_pred; - - int x,y,w2,h2; - stbi_uc *data; - void *raw_data, *raw_coeff; - stbi_uc *linebuf; - short *coeff; // progressive only - int coeff_w, coeff_h; // number of 8x8 coefficient blocks - } img_comp[4]; - - stbi__uint32 code_buffer; // jpeg entropy-coded buffer - int code_bits; // number of valid bits - unsigned char marker; // marker seen while filling entropy buffer - int nomore; // flag if we saw a marker so must stop - - int progressive; - int spec_start; - int spec_end; - int succ_high; - int succ_low; - int eob_run; - - int scan_n, order[4]; - int restart_interval, todo; - -// kernels - void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]); - void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step); - stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs); -} stbi__jpeg; - -static int stbi__build_huffman(stbi__huffman *h, int *count) -{ - int i,j,k=0,code; - // build size list for each symbol (from JPEG spec) - for (i=0; i < 16; ++i) - for (j=0; j < count[i]; ++j) - h->size[k++] = (stbi_uc) (i+1); - h->size[k] = 0; - - // compute actual symbols (from jpeg spec) - code = 0; - k = 0; - for(j=1; j <= 16; ++j) { - // compute delta to add to code to compute symbol id - h->delta[j] = k - code; - if (h->size[k] == j) { - while (h->size[k] == j) - h->code[k++] = (stbi__uint16) (code++); - if (code-1 >= (1 << j)) return stbi__err("bad code lengths","Corrupt JPEG"); - } - // compute largest code + 1 for this size, preshifted as needed later - h->maxcode[j] = code << (16-j); - code <<= 1; - } - h->maxcode[j] = 0xffffffff; - - // build non-spec acceleration table; 255 is flag for not-accelerated - memset(h->fast, 255, 1 << FAST_BITS); - for (i=0; i < k; ++i) { - int s = h->size[i]; - if (s <= FAST_BITS) { - int c = h->code[i] << (FAST_BITS-s); - int m = 1 << (FAST_BITS-s); - for (j=0; j < m; ++j) { - h->fast[c+j] = (stbi_uc) i; - } - } - } - return 1; -} - -// build a table that decodes both magnitude and value of small ACs in -// one go. -static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h) -{ - int i; - for (i=0; i < (1 << FAST_BITS); ++i) { - stbi_uc fast = h->fast[i]; - fast_ac[i] = 0; - if (fast < 255) { - int rs = h->values[fast]; - int run = (rs >> 4) & 15; - int magbits = rs & 15; - int len = h->size[fast]; - - if (magbits && len + magbits <= FAST_BITS) { - // magnitude code followed by receive_extend code - int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits); - int m = 1 << (magbits - 1); - if (k < m) k += (-1 << magbits) + 1; - // if the result is small enough, we can fit it in fast_ac table - if (k >= -128 && k <= 127) - fast_ac[i] = (stbi__int16) ((k << 8) + (run << 4) + (len + magbits)); - } - } - } -} - -static void stbi__grow_buffer_unsafe(stbi__jpeg *j) -{ - do { - int b = j->nomore ? 0 : stbi__get8(j->s); - if (b == 0xff) { - int c = stbi__get8(j->s); - if (c != 0) { - j->marker = (unsigned char) c; - j->nomore = 1; - return; - } - } - j->code_buffer |= b << (24 - j->code_bits); - j->code_bits += 8; - } while (j->code_bits <= 24); -} - -// (1 << n) - 1 -static stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535}; - -// decode a jpeg huffman value from the bitstream -stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h) -{ - unsigned int temp; - int c,k; - - if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); - - // look at the top FAST_BITS and determine what symbol ID it is, - // if the code is <= FAST_BITS - c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); - k = h->fast[c]; - if (k < 255) { - int s = h->size[k]; - if (s > j->code_bits) - return -1; - j->code_buffer <<= s; - j->code_bits -= s; - return h->values[k]; - } - - // naive test is to shift the code_buffer down so k bits are - // valid, then test against maxcode. To speed this up, we've - // preshifted maxcode left so that it has (16-k) 0s at the - // end; in other words, regardless of the number of bits, it - // wants to be compared against something shifted to have 16; - // that way we don't need to shift inside the loop. - temp = j->code_buffer >> 16; - for (k=FAST_BITS+1 ; ; ++k) - if (temp < h->maxcode[k]) - break; - if (k == 17) { - // error! code not found - j->code_bits -= 16; - return -1; - } - - if (k > j->code_bits) - return -1; - - // convert the huffman code to the symbol id - c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k]; - STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]); - - // convert the id to a symbol - j->code_bits -= k; - j->code_buffer <<= k; - return h->values[c]; -} - -// bias[n] = (-1<code_bits < n) stbi__grow_buffer_unsafe(j); - - sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB - k = stbi_lrot(j->code_buffer, n); - STBI_ASSERT(n >= 0 && n < (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask))); - j->code_buffer = k & ~stbi__bmask[n]; - k &= stbi__bmask[n]; - j->code_bits -= n; - return k + (stbi__jbias[n] & ~sgn); -} - -// get some unsigned bits -stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n) -{ - unsigned int k; - if (j->code_bits < n) stbi__grow_buffer_unsafe(j); - k = stbi_lrot(j->code_buffer, n); - j->code_buffer = k & ~stbi__bmask[n]; - k &= stbi__bmask[n]; - j->code_bits -= n; - return k; -} - -stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j) -{ - unsigned int k; - if (j->code_bits < 1) stbi__grow_buffer_unsafe(j); - k = j->code_buffer; - j->code_buffer <<= 1; - --j->code_bits; - return k & 0x80000000; -} - -// given a value that's at position X in the zigzag stream, -// where does it appear in the 8x8 matrix coded as row-major? -static stbi_uc stbi__jpeg_dezigzag[64+15] = -{ - 0, 1, 8, 16, 9, 2, 3, 10, - 17, 24, 32, 25, 18, 11, 4, 5, - 12, 19, 26, 33, 40, 48, 41, 34, - 27, 20, 13, 6, 7, 14, 21, 28, - 35, 42, 49, 56, 57, 50, 43, 36, - 29, 22, 15, 23, 30, 37, 44, 51, - 58, 59, 52, 45, 38, 31, 39, 46, - 53, 60, 61, 54, 47, 55, 62, 63, - // let corrupt input sample past end - 63, 63, 63, 63, 63, 63, 63, 63, - 63, 63, 63, 63, 63, 63, 63 -}; - -// decode one 64-entry block-- -static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi_uc *dequant) -{ - int diff,dc,k; - int t; - - if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); - t = stbi__jpeg_huff_decode(j, hdc); - if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG"); - - // 0 all the ac values now so we can do it 32-bits at a time - memset(data,0,64*sizeof(data[0])); - - diff = t ? stbi__extend_receive(j, t) : 0; - dc = j->img_comp[b].dc_pred + diff; - j->img_comp[b].dc_pred = dc; - data[0] = (short) (dc * dequant[0]); - - // decode AC components, see JPEG spec - k = 1; - do { - unsigned int zig; - int c,r,s; - if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); - c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); - r = fac[c]; - if (r) { // fast-AC path - k += (r >> 4) & 15; // run - s = r & 15; // combined length - j->code_buffer <<= s; - j->code_bits -= s; - // decode into unzigzag'd location - zig = stbi__jpeg_dezigzag[k++]; - data[zig] = (short) ((r >> 8) * dequant[zig]); - } else { - int rs = stbi__jpeg_huff_decode(j, hac); - if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); - s = rs & 15; - r = rs >> 4; - if (s == 0) { - if (rs != 0xf0) break; // end block - k += 16; - } else { - k += r; - // decode into unzigzag'd location - zig = stbi__jpeg_dezigzag[k++]; - data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]); - } - } - } while (k < 64); - return 1; -} - -static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b) -{ - int diff,dc; - int t; - if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); - - if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); - - if (j->succ_high == 0) { - // first scan for DC coefficient, must be first - memset(data,0,64*sizeof(data[0])); // 0 all the ac values now - t = stbi__jpeg_huff_decode(j, hdc); - diff = t ? stbi__extend_receive(j, t) : 0; - - dc = j->img_comp[b].dc_pred + diff; - j->img_comp[b].dc_pred = dc; - data[0] = (short) (dc << j->succ_low); - } else { - // refinement scan for DC coefficient - if (stbi__jpeg_get_bit(j)) - data[0] += (short) (1 << j->succ_low); - } - return 1; -} - -// @OPTIMIZE: store non-zigzagged during the decode passes, -// and only de-zigzag when dequantizing -static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac) -{ - int k; - if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); - - if (j->succ_high == 0) { - int shift = j->succ_low; - - if (j->eob_run) { - --j->eob_run; - return 1; - } - - k = j->spec_start; - do { - unsigned int zig; - int c,r,s; - if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); - c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); - r = fac[c]; - if (r) { // fast-AC path - k += (r >> 4) & 15; // run - s = r & 15; // combined length - j->code_buffer <<= s; - j->code_bits -= s; - zig = stbi__jpeg_dezigzag[k++]; - data[zig] = (short) ((r >> 8) << shift); - } else { - int rs = stbi__jpeg_huff_decode(j, hac); - if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); - s = rs & 15; - r = rs >> 4; - if (s == 0) { - if (r < 15) { - j->eob_run = (1 << r); - if (r) - j->eob_run += stbi__jpeg_get_bits(j, r); - --j->eob_run; - break; - } - k += 16; - } else { - k += r; - zig = stbi__jpeg_dezigzag[k++]; - data[zig] = (short) (stbi__extend_receive(j,s) << shift); - } - } - } while (k <= j->spec_end); - } else { - // refinement scan for these AC coefficients - - short bit = (short) (1 << j->succ_low); - - if (j->eob_run) { - --j->eob_run; - for (k = j->spec_start; k <= j->spec_end; ++k) { - short *p = &data[stbi__jpeg_dezigzag[k]]; - if (*p != 0) - if (stbi__jpeg_get_bit(j)) - if ((*p & bit)==0) { - if (*p > 0) - *p += bit; - else - *p -= bit; - } - } - } else { - k = j->spec_start; - do { - int r,s; - int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh - if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); - s = rs & 15; - r = rs >> 4; - if (s == 0) { - if (r < 15) { - j->eob_run = (1 << r) - 1; - if (r) - j->eob_run += stbi__jpeg_get_bits(j, r); - r = 64; // force end of block - } else { - // r=15 s=0 should write 16 0s, so we just do - // a run of 15 0s and then write s (which is 0), - // so we don't have to do anything special here - } - } else { - if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG"); - // sign bit - if (stbi__jpeg_get_bit(j)) - s = bit; - else - s = -bit; - } - - // advance by r - while (k <= j->spec_end) { - short *p = &data[stbi__jpeg_dezigzag[k++]]; - if (*p != 0) { - if (stbi__jpeg_get_bit(j)) - if ((*p & bit)==0) { - if (*p > 0) - *p += bit; - else - *p -= bit; - } - } else { - if (r == 0) { - *p = (short) s; - break; - } - --r; - } - } - } while (k <= j->spec_end); - } - } - return 1; -} - -// take a -128..127 value and stbi__clamp it and convert to 0..255 -stbi_inline static stbi_uc stbi__clamp(int x) -{ - // trick to use a single test to catch both cases - if ((unsigned int) x > 255) { - if (x < 0) return 0; - if (x > 255) return 255; - } - return (stbi_uc) x; -} - -#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5))) -#define stbi__fsh(x) ((x) << 12) - -// derived from jidctint -- DCT_ISLOW -#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ - int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ - p2 = s2; \ - p3 = s6; \ - p1 = (p2+p3) * stbi__f2f(0.5411961f); \ - t2 = p1 + p3*stbi__f2f(-1.847759065f); \ - t3 = p1 + p2*stbi__f2f( 0.765366865f); \ - p2 = s0; \ - p3 = s4; \ - t0 = stbi__fsh(p2+p3); \ - t1 = stbi__fsh(p2-p3); \ - x0 = t0+t3; \ - x3 = t0-t3; \ - x1 = t1+t2; \ - x2 = t1-t2; \ - t0 = s7; \ - t1 = s5; \ - t2 = s3; \ - t3 = s1; \ - p3 = t0+t2; \ - p4 = t1+t3; \ - p1 = t0+t3; \ - p2 = t1+t2; \ - p5 = (p3+p4)*stbi__f2f( 1.175875602f); \ - t0 = t0*stbi__f2f( 0.298631336f); \ - t1 = t1*stbi__f2f( 2.053119869f); \ - t2 = t2*stbi__f2f( 3.072711026f); \ - t3 = t3*stbi__f2f( 1.501321110f); \ - p1 = p5 + p1*stbi__f2f(-0.899976223f); \ - p2 = p5 + p2*stbi__f2f(-2.562915447f); \ - p3 = p3*stbi__f2f(-1.961570560f); \ - p4 = p4*stbi__f2f(-0.390180644f); \ - t3 += p1+p4; \ - t2 += p2+p3; \ - t1 += p2+p4; \ - t0 += p1+p3; - -static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64]) -{ - int i,val[64],*v=val; - stbi_uc *o; - short *d = data; - - // columns - for (i=0; i < 8; ++i,++d, ++v) { - // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing - if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 - && d[40]==0 && d[48]==0 && d[56]==0) { - // no shortcut 0 seconds - // (1|2|3|4|5|6|7)==0 0 seconds - // all separate -0.047 seconds - // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds - int dcterm = d[0] << 2; - v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; - } else { - STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56]) - // constants scaled things up by 1<<12; let's bring them back - // down, but keep 2 extra bits of precision - x0 += 512; x1 += 512; x2 += 512; x3 += 512; - v[ 0] = (x0+t3) >> 10; - v[56] = (x0-t3) >> 10; - v[ 8] = (x1+t2) >> 10; - v[48] = (x1-t2) >> 10; - v[16] = (x2+t1) >> 10; - v[40] = (x2-t1) >> 10; - v[24] = (x3+t0) >> 10; - v[32] = (x3-t0) >> 10; - } - } - - for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { - // no fast case since the first 1D IDCT spread components out - STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) - // constants scaled things up by 1<<12, plus we had 1<<2 from first - // loop, plus horizontal and vertical each scale by sqrt(8) so together - // we've got an extra 1<<3, so 1<<17 total we need to remove. - // so we want to round that, which means adding 0.5 * 1<<17, - // aka 65536. Also, we'll end up with -128 to 127 that we want - // to encode as 0..255 by adding 128, so we'll add that before the shift - x0 += 65536 + (128<<17); - x1 += 65536 + (128<<17); - x2 += 65536 + (128<<17); - x3 += 65536 + (128<<17); - // tried computing the shifts into temps, or'ing the temps to see - // if any were out of range, but that was slower - o[0] = stbi__clamp((x0+t3) >> 17); - o[7] = stbi__clamp((x0-t3) >> 17); - o[1] = stbi__clamp((x1+t2) >> 17); - o[6] = stbi__clamp((x1-t2) >> 17); - o[2] = stbi__clamp((x2+t1) >> 17); - o[5] = stbi__clamp((x2-t1) >> 17); - o[3] = stbi__clamp((x3+t0) >> 17); - o[4] = stbi__clamp((x3-t0) >> 17); - } -} - -#ifdef STBI_SSE2 -// sse2 integer IDCT. not the fastest possible implementation but it -// produces bit-identical results to the generic C version so it's -// fully "transparent". -static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) -{ - // This is constructed to match our regular (generic) integer IDCT exactly. - __m128i row0, row1, row2, row3, row4, row5, row6, row7; - __m128i tmp; - - // dot product constant: even elems=x, odd elems=y - #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y)) - - // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit) - // out(1) = c1[even]*x + c1[odd]*y - #define dct_rot(out0,out1, x,y,c0,c1) \ - __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \ - __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \ - __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \ - __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \ - __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \ - __m128i out1##_h = _mm_madd_epi16(c0##hi, c1) - - // out = in << 12 (in 16-bit, out 32-bit) - #define dct_widen(out, in) \ - __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \ - __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4) - - // wide add - #define dct_wadd(out, a, b) \ - __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \ - __m128i out##_h = _mm_add_epi32(a##_h, b##_h) - - // wide sub - #define dct_wsub(out, a, b) \ - __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \ - __m128i out##_h = _mm_sub_epi32(a##_h, b##_h) - - // butterfly a/b, add bias, then shift by "s" and pack - #define dct_bfly32o(out0, out1, a,b,bias,s) \ - { \ - __m128i abiased_l = _mm_add_epi32(a##_l, bias); \ - __m128i abiased_h = _mm_add_epi32(a##_h, bias); \ - dct_wadd(sum, abiased, b); \ - dct_wsub(dif, abiased, b); \ - out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \ - out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \ - } - - // 8-bit interleave step (for transposes) - #define dct_interleave8(a, b) \ - tmp = a; \ - a = _mm_unpacklo_epi8(a, b); \ - b = _mm_unpackhi_epi8(tmp, b) - - // 16-bit interleave step (for transposes) - #define dct_interleave16(a, b) \ - tmp = a; \ - a = _mm_unpacklo_epi16(a, b); \ - b = _mm_unpackhi_epi16(tmp, b) - - #define dct_pass(bias,shift) \ - { \ - /* even part */ \ - dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \ - __m128i sum04 = _mm_add_epi16(row0, row4); \ - __m128i dif04 = _mm_sub_epi16(row0, row4); \ - dct_widen(t0e, sum04); \ - dct_widen(t1e, dif04); \ - dct_wadd(x0, t0e, t3e); \ - dct_wsub(x3, t0e, t3e); \ - dct_wadd(x1, t1e, t2e); \ - dct_wsub(x2, t1e, t2e); \ - /* odd part */ \ - dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \ - dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \ - __m128i sum17 = _mm_add_epi16(row1, row7); \ - __m128i sum35 = _mm_add_epi16(row3, row5); \ - dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \ - dct_wadd(x4, y0o, y4o); \ - dct_wadd(x5, y1o, y5o); \ - dct_wadd(x6, y2o, y5o); \ - dct_wadd(x7, y3o, y4o); \ - dct_bfly32o(row0,row7, x0,x7,bias,shift); \ - dct_bfly32o(row1,row6, x1,x6,bias,shift); \ - dct_bfly32o(row2,row5, x2,x5,bias,shift); \ - dct_bfly32o(row3,row4, x3,x4,bias,shift); \ - } - - __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f)); - __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f)); - __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f)); - __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f)); - __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f)); - __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f)); - __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f)); - __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f)); - - // rounding biases in column/row passes, see stbi__idct_block for explanation. - __m128i bias_0 = _mm_set1_epi32(512); - __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17)); - - // load - row0 = _mm_load_si128((const __m128i *) (data + 0*8)); - row1 = _mm_load_si128((const __m128i *) (data + 1*8)); - row2 = _mm_load_si128((const __m128i *) (data + 2*8)); - row3 = _mm_load_si128((const __m128i *) (data + 3*8)); - row4 = _mm_load_si128((const __m128i *) (data + 4*8)); - row5 = _mm_load_si128((const __m128i *) (data + 5*8)); - row6 = _mm_load_si128((const __m128i *) (data + 6*8)); - row7 = _mm_load_si128((const __m128i *) (data + 7*8)); - - // column pass - dct_pass(bias_0, 10); - - { - // 16bit 8x8 transpose pass 1 - dct_interleave16(row0, row4); - dct_interleave16(row1, row5); - dct_interleave16(row2, row6); - dct_interleave16(row3, row7); - - // transpose pass 2 - dct_interleave16(row0, row2); - dct_interleave16(row1, row3); - dct_interleave16(row4, row6); - dct_interleave16(row5, row7); - - // transpose pass 3 - dct_interleave16(row0, row1); - dct_interleave16(row2, row3); - dct_interleave16(row4, row5); - dct_interleave16(row6, row7); - } - - // row pass - dct_pass(bias_1, 17); - - { - // pack - __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7 - __m128i p1 = _mm_packus_epi16(row2, row3); - __m128i p2 = _mm_packus_epi16(row4, row5); - __m128i p3 = _mm_packus_epi16(row6, row7); - - // 8bit 8x8 transpose pass 1 - dct_interleave8(p0, p2); // a0e0a1e1... - dct_interleave8(p1, p3); // c0g0c1g1... - - // transpose pass 2 - dct_interleave8(p0, p1); // a0c0e0g0... - dct_interleave8(p2, p3); // b0d0f0h0... - - // transpose pass 3 - dct_interleave8(p0, p2); // a0b0c0d0... - dct_interleave8(p1, p3); // a4b4c4d4... - - // store - _mm_storel_epi64((__m128i *) out, p0); out += out_stride; - _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride; - _mm_storel_epi64((__m128i *) out, p2); out += out_stride; - _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride; - _mm_storel_epi64((__m128i *) out, p1); out += out_stride; - _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride; - _mm_storel_epi64((__m128i *) out, p3); out += out_stride; - _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e)); - } - -#undef dct_const -#undef dct_rot -#undef dct_widen -#undef dct_wadd -#undef dct_wsub -#undef dct_bfly32o -#undef dct_interleave8 -#undef dct_interleave16 -#undef dct_pass -} - -#endif // STBI_SSE2 - -#ifdef STBI_NEON - -// NEON integer IDCT. should produce bit-identical -// results to the generic C version. -static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) -{ - int16x8_t row0, row1, row2, row3, row4, row5, row6, row7; - - int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f)); - int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f)); - int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f)); - int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f)); - int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f)); - int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f)); - int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f)); - int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f)); - int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f)); - int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f)); - int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f)); - int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f)); - -#define dct_long_mul(out, inq, coeff) \ - int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \ - int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff) - -#define dct_long_mac(out, acc, inq, coeff) \ - int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \ - int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff) - -#define dct_widen(out, inq) \ - int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \ - int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12) - -// wide add -#define dct_wadd(out, a, b) \ - int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \ - int32x4_t out##_h = vaddq_s32(a##_h, b##_h) - -// wide sub -#define dct_wsub(out, a, b) \ - int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \ - int32x4_t out##_h = vsubq_s32(a##_h, b##_h) - -// butterfly a/b, then shift using "shiftop" by "s" and pack -#define dct_bfly32o(out0,out1, a,b,shiftop,s) \ - { \ - dct_wadd(sum, a, b); \ - dct_wsub(dif, a, b); \ - out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \ - out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \ - } - -#define dct_pass(shiftop, shift) \ - { \ - /* even part */ \ - int16x8_t sum26 = vaddq_s16(row2, row6); \ - dct_long_mul(p1e, sum26, rot0_0); \ - dct_long_mac(t2e, p1e, row6, rot0_1); \ - dct_long_mac(t3e, p1e, row2, rot0_2); \ - int16x8_t sum04 = vaddq_s16(row0, row4); \ - int16x8_t dif04 = vsubq_s16(row0, row4); \ - dct_widen(t0e, sum04); \ - dct_widen(t1e, dif04); \ - dct_wadd(x0, t0e, t3e); \ - dct_wsub(x3, t0e, t3e); \ - dct_wadd(x1, t1e, t2e); \ - dct_wsub(x2, t1e, t2e); \ - /* odd part */ \ - int16x8_t sum15 = vaddq_s16(row1, row5); \ - int16x8_t sum17 = vaddq_s16(row1, row7); \ - int16x8_t sum35 = vaddq_s16(row3, row5); \ - int16x8_t sum37 = vaddq_s16(row3, row7); \ - int16x8_t sumodd = vaddq_s16(sum17, sum35); \ - dct_long_mul(p5o, sumodd, rot1_0); \ - dct_long_mac(p1o, p5o, sum17, rot1_1); \ - dct_long_mac(p2o, p5o, sum35, rot1_2); \ - dct_long_mul(p3o, sum37, rot2_0); \ - dct_long_mul(p4o, sum15, rot2_1); \ - dct_wadd(sump13o, p1o, p3o); \ - dct_wadd(sump24o, p2o, p4o); \ - dct_wadd(sump23o, p2o, p3o); \ - dct_wadd(sump14o, p1o, p4o); \ - dct_long_mac(x4, sump13o, row7, rot3_0); \ - dct_long_mac(x5, sump24o, row5, rot3_1); \ - dct_long_mac(x6, sump23o, row3, rot3_2); \ - dct_long_mac(x7, sump14o, row1, rot3_3); \ - dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \ - dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \ - dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \ - dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \ - } - - // load - row0 = vld1q_s16(data + 0*8); - row1 = vld1q_s16(data + 1*8); - row2 = vld1q_s16(data + 2*8); - row3 = vld1q_s16(data + 3*8); - row4 = vld1q_s16(data + 4*8); - row5 = vld1q_s16(data + 5*8); - row6 = vld1q_s16(data + 6*8); - row7 = vld1q_s16(data + 7*8); - - // add DC bias - row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0)); - - // column pass - dct_pass(vrshrn_n_s32, 10); - - // 16bit 8x8 transpose - { -// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively. -// whether compilers actually get this is another story, sadly. -#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; } -#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); } -#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); } - - // pass 1 - dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6 - dct_trn16(row2, row3); - dct_trn16(row4, row5); - dct_trn16(row6, row7); - - // pass 2 - dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4 - dct_trn32(row1, row3); - dct_trn32(row4, row6); - dct_trn32(row5, row7); - - // pass 3 - dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0 - dct_trn64(row1, row5); - dct_trn64(row2, row6); - dct_trn64(row3, row7); - -#undef dct_trn16 -#undef dct_trn32 -#undef dct_trn64 - } - - // row pass - // vrshrn_n_s32 only supports shifts up to 16, we need - // 17. so do a non-rounding shift of 16 first then follow - // up with a rounding shift by 1. - dct_pass(vshrn_n_s32, 16); - - { - // pack and round - uint8x8_t p0 = vqrshrun_n_s16(row0, 1); - uint8x8_t p1 = vqrshrun_n_s16(row1, 1); - uint8x8_t p2 = vqrshrun_n_s16(row2, 1); - uint8x8_t p3 = vqrshrun_n_s16(row3, 1); - uint8x8_t p4 = vqrshrun_n_s16(row4, 1); - uint8x8_t p5 = vqrshrun_n_s16(row5, 1); - uint8x8_t p6 = vqrshrun_n_s16(row6, 1); - uint8x8_t p7 = vqrshrun_n_s16(row7, 1); - - // again, these can translate into one instruction, but often don't. -#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; } -#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); } -#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); } - - // sadly can't use interleaved stores here since we only write - // 8 bytes to each scan line! - - // 8x8 8-bit transpose pass 1 - dct_trn8_8(p0, p1); - dct_trn8_8(p2, p3); - dct_trn8_8(p4, p5); - dct_trn8_8(p6, p7); - - // pass 2 - dct_trn8_16(p0, p2); - dct_trn8_16(p1, p3); - dct_trn8_16(p4, p6); - dct_trn8_16(p5, p7); - - // pass 3 - dct_trn8_32(p0, p4); - dct_trn8_32(p1, p5); - dct_trn8_32(p2, p6); - dct_trn8_32(p3, p7); - - // store - vst1_u8(out, p0); out += out_stride; - vst1_u8(out, p1); out += out_stride; - vst1_u8(out, p2); out += out_stride; - vst1_u8(out, p3); out += out_stride; - vst1_u8(out, p4); out += out_stride; - vst1_u8(out, p5); out += out_stride; - vst1_u8(out, p6); out += out_stride; - vst1_u8(out, p7); - -#undef dct_trn8_8 -#undef dct_trn8_16 -#undef dct_trn8_32 - } - -#undef dct_long_mul -#undef dct_long_mac -#undef dct_widen -#undef dct_wadd -#undef dct_wsub -#undef dct_bfly32o -#undef dct_pass -} - -#endif // STBI_NEON - -#define STBI__MARKER_none 0xff -// if there's a pending marker from the entropy stream, return that -// otherwise, fetch from the stream and get a marker. if there's no -// marker, return 0xff, which is never a valid marker value -static stbi_uc stbi__get_marker(stbi__jpeg *j) -{ - stbi_uc x; - if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; } - x = stbi__get8(j->s); - if (x != 0xff) return STBI__MARKER_none; - while (x == 0xff) - x = stbi__get8(j->s); - return x; -} - -// in each scan, we'll have scan_n components, and the order -// of the components is specified by order[] -#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) - -// after a restart interval, stbi__jpeg_reset the entropy decoder and -// the dc prediction -static void stbi__jpeg_reset(stbi__jpeg *j) -{ - j->code_bits = 0; - j->code_buffer = 0; - j->nomore = 0; - j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0; - j->marker = STBI__MARKER_none; - j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; - j->eob_run = 0; - // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, - // since we don't even allow 1<<30 pixels -} - -static int stbi__parse_entropy_coded_data(stbi__jpeg *z) -{ - stbi__jpeg_reset(z); - if (!z->progressive) { - if (z->scan_n == 1) { - int i,j; - STBI_SIMD_ALIGN(short, data[64]); - int n = z->order[0]; - // non-interleaved data, we just need to process one block at a time, - // in trivial scanline order - // number of blocks to do just depends on how many actual "pixels" this - // component has, independent of interleaved MCU blocking and such - int w = (z->img_comp[n].x+7) >> 3; - int h = (z->img_comp[n].y+7) >> 3; - for (j=0; j < h; ++j) { - for (i=0; i < w; ++i) { - int ha = z->img_comp[n].ha; - if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; - z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); - // every data block is an MCU, so countdown the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); - // if it's NOT a restart, then just bail, so we get corrupt data - // rather than no data - if (!STBI__RESTART(z->marker)) return 1; - stbi__jpeg_reset(z); - } - } - } - return 1; - } else { // interleaved - int i,j,k,x,y; - STBI_SIMD_ALIGN(short, data[64]); - for (j=0; j < z->img_mcu_y; ++j) { - for (i=0; i < z->img_mcu_x; ++i) { - // scan an interleaved mcu... process scan_n components in order - for (k=0; k < z->scan_n; ++k) { - int n = z->order[k]; - // scan out an mcu's worth of this component; that's just determined - // by the basic H and V specified for the component - for (y=0; y < z->img_comp[n].v; ++y) { - for (x=0; x < z->img_comp[n].h; ++x) { - int x2 = (i*z->img_comp[n].h + x)*8; - int y2 = (j*z->img_comp[n].v + y)*8; - int ha = z->img_comp[n].ha; - if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; - z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data); - } - } - } - // after all interleaved components, that's an interleaved MCU, - // so now count down the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); - if (!STBI__RESTART(z->marker)) return 1; - stbi__jpeg_reset(z); - } - } - } - return 1; - } - } else { - if (z->scan_n == 1) { - int i,j; - int n = z->order[0]; - // non-interleaved data, we just need to process one block at a time, - // in trivial scanline order - // number of blocks to do just depends on how many actual "pixels" this - // component has, independent of interleaved MCU blocking and such - int w = (z->img_comp[n].x+7) >> 3; - int h = (z->img_comp[n].y+7) >> 3; - for (j=0; j < h; ++j) { - for (i=0; i < w; ++i) { - short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); - if (z->spec_start == 0) { - if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) - return 0; - } else { - int ha = z->img_comp[n].ha; - if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha])) - return 0; - } - // every data block is an MCU, so countdown the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); - if (!STBI__RESTART(z->marker)) return 1; - stbi__jpeg_reset(z); - } - } - } - return 1; - } else { // interleaved - int i,j,k,x,y; - for (j=0; j < z->img_mcu_y; ++j) { - for (i=0; i < z->img_mcu_x; ++i) { - // scan an interleaved mcu... process scan_n components in order - for (k=0; k < z->scan_n; ++k) { - int n = z->order[k]; - // scan out an mcu's worth of this component; that's just determined - // by the basic H and V specified for the component - for (y=0; y < z->img_comp[n].v; ++y) { - for (x=0; x < z->img_comp[n].h; ++x) { - int x2 = (i*z->img_comp[n].h + x); - int y2 = (j*z->img_comp[n].v + y); - short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w); - if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) - return 0; - } - } - } - // after all interleaved components, that's an interleaved MCU, - // so now count down the restart interval - if (--z->todo <= 0) { - if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); - if (!STBI__RESTART(z->marker)) return 1; - stbi__jpeg_reset(z); - } - } - } - return 1; - } - } -} - -static void stbi__jpeg_dequantize(short *data, stbi_uc *dequant) -{ - int i; - for (i=0; i < 64; ++i) - data[i] *= dequant[i]; -} - -static void stbi__jpeg_finish(stbi__jpeg *z) -{ - if (z->progressive) { - // dequantize and idct the data - int i,j,n; - for (n=0; n < z->s->img_n; ++n) { - int w = (z->img_comp[n].x+7) >> 3; - int h = (z->img_comp[n].y+7) >> 3; - for (j=0; j < h; ++j) { - for (i=0; i < w; ++i) { - short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); - stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]); - z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); - } - } - } - } -} - -static int stbi__process_marker(stbi__jpeg *z, int m) -{ - int L; - switch (m) { - case STBI__MARKER_none: // no marker found - return stbi__err("expected marker","Corrupt JPEG"); - - case 0xDD: // DRI - specify restart interval - if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG"); - z->restart_interval = stbi__get16be(z->s); - return 1; - - case 0xDB: // DQT - define quantization table - L = stbi__get16be(z->s)-2; - while (L > 0) { - int q = stbi__get8(z->s); - int p = q >> 4; - int t = q & 15,i; - if (p != 0) return stbi__err("bad DQT type","Corrupt JPEG"); - if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG"); - for (i=0; i < 64; ++i) - z->dequant[t][stbi__jpeg_dezigzag[i]] = stbi__get8(z->s); - L -= 65; - } - return L==0; - - case 0xC4: // DHT - define huffman table - L = stbi__get16be(z->s)-2; - while (L > 0) { - stbi_uc *v; - int sizes[16],i,n=0; - int q = stbi__get8(z->s); - int tc = q >> 4; - int th = q & 15; - if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG"); - for (i=0; i < 16; ++i) { - sizes[i] = stbi__get8(z->s); - n += sizes[i]; - } - L -= 17; - if (tc == 0) { - if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0; - v = z->huff_dc[th].values; - } else { - if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0; - v = z->huff_ac[th].values; - } - for (i=0; i < n; ++i) - v[i] = stbi__get8(z->s); - if (tc != 0) - stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th); - L -= n; - } - return L==0; - } - // check for comment block or APP blocks - if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { - stbi__skip(z->s, stbi__get16be(z->s)-2); - return 1; - } - return 0; -} - -// after we see SOS -static int stbi__process_scan_header(stbi__jpeg *z) -{ - int i; - int Ls = stbi__get16be(z->s); - z->scan_n = stbi__get8(z->s); - if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG"); - if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG"); - for (i=0; i < z->scan_n; ++i) { - int id = stbi__get8(z->s), which; - int q = stbi__get8(z->s); - for (which = 0; which < z->s->img_n; ++which) - if (z->img_comp[which].id == id) - break; - if (which == z->s->img_n) return 0; // no match - z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG"); - z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG"); - z->order[i] = which; - } - - { - int aa; - z->spec_start = stbi__get8(z->s); - z->spec_end = stbi__get8(z->s); // should be 63, but might be 0 - aa = stbi__get8(z->s); - z->succ_high = (aa >> 4); - z->succ_low = (aa & 15); - if (z->progressive) { - if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13) - return stbi__err("bad SOS", "Corrupt JPEG"); - } else { - if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG"); - if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG"); - z->spec_end = 63; - } - } - - return 1; -} - -static int stbi__process_frame_header(stbi__jpeg *z, int scan) -{ - stbi__context *s = z->s; - int Lf,p,i,q, h_max=1,v_max=1,c; - Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG - p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline - s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG - s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires - c = stbi__get8(s); - if (c != 3 && c != 1) return stbi__err("bad component count","Corrupt JPEG"); // JFIF requires - s->img_n = c; - for (i=0; i < c; ++i) { - z->img_comp[i].data = NULL; - z->img_comp[i].linebuf = NULL; - } - - if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG"); - - for (i=0; i < s->img_n; ++i) { - z->img_comp[i].id = stbi__get8(s); - if (z->img_comp[i].id != i+1) // JFIF requires - if (z->img_comp[i].id != i) // some version of jpegtran outputs non-JFIF-compliant files! - return stbi__err("bad component ID","Corrupt JPEG"); - q = stbi__get8(s); - z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG"); - z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG"); - z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG"); - } - - if (scan != STBI__SCAN_load) return 1; - - if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); - - for (i=0; i < s->img_n; ++i) { - if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h; - if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; - } - - // compute interleaved mcu info - z->img_h_max = h_max; - z->img_v_max = v_max; - z->img_mcu_w = h_max * 8; - z->img_mcu_h = v_max * 8; - z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; - z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; - - for (i=0; i < s->img_n; ++i) { - // number of effective pixels (e.g. for non-interleaved MCU) - z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; - z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; - // to simplify generation, we'll allocate enough memory to decode - // the bogus oversized data from using interleaved MCUs and their - // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't - // discard the extra data until colorspace conversion - z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; - z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; - z->img_comp[i].raw_data = stbi__malloc(z->img_comp[i].w2 * z->img_comp[i].h2+15); - - if (z->img_comp[i].raw_data == NULL) { - for(--i; i >= 0; --i) { - STBI_FREE(z->img_comp[i].raw_data); - z->img_comp[i].raw_data = NULL; - } - return stbi__err("outofmem", "Out of memory"); - } - // align blocks for idct using mmx/sse - z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); - z->img_comp[i].linebuf = NULL; - if (z->progressive) { - z->img_comp[i].coeff_w = (z->img_comp[i].w2 + 7) >> 3; - z->img_comp[i].coeff_h = (z->img_comp[i].h2 + 7) >> 3; - z->img_comp[i].raw_coeff = STBI_MALLOC(z->img_comp[i].coeff_w * z->img_comp[i].coeff_h * 64 * sizeof(short) + 15); - z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15); - } else { - z->img_comp[i].coeff = 0; - z->img_comp[i].raw_coeff = 0; - } - } - - return 1; -} - -// use comparisons since in some cases we handle more than one case (e.g. SOF) -#define stbi__DNL(x) ((x) == 0xdc) -#define stbi__SOI(x) ((x) == 0xd8) -#define stbi__EOI(x) ((x) == 0xd9) -#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2) -#define stbi__SOS(x) ((x) == 0xda) - -#define stbi__SOF_progressive(x) ((x) == 0xc2) - -static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan) -{ - int m; - z->marker = STBI__MARKER_none; // initialize cached marker to empty - m = stbi__get_marker(z); - if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG"); - if (scan == STBI__SCAN_type) return 1; - m = stbi__get_marker(z); - while (!stbi__SOF(m)) { - if (!stbi__process_marker(z,m)) return 0; - m = stbi__get_marker(z); - while (m == STBI__MARKER_none) { - // some files have extra padding after their blocks, so ok, we'll scan - if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG"); - m = stbi__get_marker(z); - } - } - z->progressive = stbi__SOF_progressive(m); - if (!stbi__process_frame_header(z, scan)) return 0; - return 1; -} - -// decode image to YCbCr format -static int stbi__decode_jpeg_image(stbi__jpeg *j) -{ - int m; - for (m = 0; m < 4; m++) { - j->img_comp[m].raw_data = NULL; - j->img_comp[m].raw_coeff = NULL; - } - j->restart_interval = 0; - if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0; - m = stbi__get_marker(j); - while (!stbi__EOI(m)) { - if (stbi__SOS(m)) { - if (!stbi__process_scan_header(j)) return 0; - if (!stbi__parse_entropy_coded_data(j)) return 0; - if (j->marker == STBI__MARKER_none ) { - // handle 0s at the end of image data from IP Kamera 9060 - while (!stbi__at_eof(j->s)) { - int x = stbi__get8(j->s); - if (x == 255) { - j->marker = stbi__get8(j->s); - break; - } else if (x != 0) { - return stbi__err("junk before marker", "Corrupt JPEG"); - } - } - // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 - } - } else { - if (!stbi__process_marker(j, m)) return 0; - } - m = stbi__get_marker(j); - } - if (j->progressive) - stbi__jpeg_finish(j); - return 1; -} - -// static jfif-centered resampling (across block boundaries) - -typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1, - int w, int hs); - -#define stbi__div4(x) ((stbi_uc) ((x) >> 2)) - -static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) -{ - STBI_NOTUSED(out); - STBI_NOTUSED(in_far); - STBI_NOTUSED(w); - STBI_NOTUSED(hs); - return in_near; -} - -static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) -{ - // need to generate two samples vertically for every one in input - int i; - STBI_NOTUSED(hs); - for (i=0; i < w; ++i) - out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2); - return out; -} - -static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) -{ - // need to generate two samples horizontally for every one in input - int i; - stbi_uc *input = in_near; - - if (w == 1) { - // if only one sample, can't do any interpolation - out[0] = out[1] = input[0]; - return out; - } - - out[0] = input[0]; - out[1] = stbi__div4(input[0]*3 + input[1] + 2); - for (i=1; i < w-1; ++i) { - int n = 3*input[i]+2; - out[i*2+0] = stbi__div4(n+input[i-1]); - out[i*2+1] = stbi__div4(n+input[i+1]); - } - out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2); - out[i*2+1] = input[w-1]; - - STBI_NOTUSED(in_far); - STBI_NOTUSED(hs); - - return out; -} - -#define stbi__div16(x) ((stbi_uc) ((x) >> 4)) - -static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) -{ - // need to generate 2x2 samples for every one in input - int i,t0,t1; - if (w == 1) { - out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); - return out; - } - - t1 = 3*in_near[0] + in_far[0]; - out[0] = stbi__div4(t1+2); - for (i=1; i < w; ++i) { - t0 = t1; - t1 = 3*in_near[i]+in_far[i]; - out[i*2-1] = stbi__div16(3*t0 + t1 + 8); - out[i*2 ] = stbi__div16(3*t1 + t0 + 8); - } - out[w*2-1] = stbi__div4(t1+2); - - STBI_NOTUSED(hs); - - return out; -} - -#if defined(STBI_SSE2) || defined(STBI_NEON) -static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) -{ - // need to generate 2x2 samples for every one in input - int i=0,t0,t1; - - if (w == 1) { - out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); - return out; - } - - t1 = 3*in_near[0] + in_far[0]; - // process groups of 8 pixels for as long as we can. - // note we can't handle the last pixel in a row in this loop - // because we need to handle the filter boundary conditions. - for (; i < ((w-1) & ~7); i += 8) { -#if defined(STBI_SSE2) - // load and perform the vertical filtering pass - // this uses 3*x + y = 4*x + (y - x) - __m128i zero = _mm_setzero_si128(); - __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i)); - __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i)); - __m128i farw = _mm_unpacklo_epi8(farb, zero); - __m128i nearw = _mm_unpacklo_epi8(nearb, zero); - __m128i diff = _mm_sub_epi16(farw, nearw); - __m128i nears = _mm_slli_epi16(nearw, 2); - __m128i curr = _mm_add_epi16(nears, diff); // current row - - // horizontal filter works the same based on shifted vers of current - // row. "prev" is current row shifted right by 1 pixel; we need to - // insert the previous pixel value (from t1). - // "next" is current row shifted left by 1 pixel, with first pixel - // of next block of 8 pixels added in. - __m128i prv0 = _mm_slli_si128(curr, 2); - __m128i nxt0 = _mm_srli_si128(curr, 2); - __m128i prev = _mm_insert_epi16(prv0, t1, 0); - __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7); - - // horizontal filter, polyphase implementation since it's convenient: - // even pixels = 3*cur + prev = cur*4 + (prev - cur) - // odd pixels = 3*cur + next = cur*4 + (next - cur) - // note the shared term. - __m128i bias = _mm_set1_epi16(8); - __m128i curs = _mm_slli_epi16(curr, 2); - __m128i prvd = _mm_sub_epi16(prev, curr); - __m128i nxtd = _mm_sub_epi16(next, curr); - __m128i curb = _mm_add_epi16(curs, bias); - __m128i even = _mm_add_epi16(prvd, curb); - __m128i odd = _mm_add_epi16(nxtd, curb); - - // interleave even and odd pixels, then undo scaling. - __m128i int0 = _mm_unpacklo_epi16(even, odd); - __m128i int1 = _mm_unpackhi_epi16(even, odd); - __m128i de0 = _mm_srli_epi16(int0, 4); - __m128i de1 = _mm_srli_epi16(int1, 4); - - // pack and write output - __m128i outv = _mm_packus_epi16(de0, de1); - _mm_storeu_si128((__m128i *) (out + i*2), outv); -#elif defined(STBI_NEON) - // load and perform the vertical filtering pass - // this uses 3*x + y = 4*x + (y - x) - uint8x8_t farb = vld1_u8(in_far + i); - uint8x8_t nearb = vld1_u8(in_near + i); - int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb)); - int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2)); - int16x8_t curr = vaddq_s16(nears, diff); // current row - - // horizontal filter works the same based on shifted vers of current - // row. "prev" is current row shifted right by 1 pixel; we need to - // insert the previous pixel value (from t1). - // "next" is current row shifted left by 1 pixel, with first pixel - // of next block of 8 pixels added in. - int16x8_t prv0 = vextq_s16(curr, curr, 7); - int16x8_t nxt0 = vextq_s16(curr, curr, 1); - int16x8_t prev = vsetq_lane_s16(t1, prv0, 0); - int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7); - - // horizontal filter, polyphase implementation since it's convenient: - // even pixels = 3*cur + prev = cur*4 + (prev - cur) - // odd pixels = 3*cur + next = cur*4 + (next - cur) - // note the shared term. - int16x8_t curs = vshlq_n_s16(curr, 2); - int16x8_t prvd = vsubq_s16(prev, curr); - int16x8_t nxtd = vsubq_s16(next, curr); - int16x8_t even = vaddq_s16(curs, prvd); - int16x8_t odd = vaddq_s16(curs, nxtd); - - // undo scaling and round, then store with even/odd phases interleaved - uint8x8x2_t o; - o.val[0] = vqrshrun_n_s16(even, 4); - o.val[1] = vqrshrun_n_s16(odd, 4); - vst2_u8(out + i*2, o); -#endif - - // "previous" value for next iter - t1 = 3*in_near[i+7] + in_far[i+7]; - } - - t0 = t1; - t1 = 3*in_near[i] + in_far[i]; - out[i*2] = stbi__div16(3*t1 + t0 + 8); - - for (++i; i < w; ++i) { - t0 = t1; - t1 = 3*in_near[i]+in_far[i]; - out[i*2-1] = stbi__div16(3*t0 + t1 + 8); - out[i*2 ] = stbi__div16(3*t1 + t0 + 8); - } - out[w*2-1] = stbi__div4(t1+2); - - STBI_NOTUSED(hs); - - return out; -} -#endif - -static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) -{ - // resample with nearest-neighbor - int i,j; - STBI_NOTUSED(in_far); - for (i=0; i < w; ++i) - for (j=0; j < hs; ++j) - out[i*hs+j] = in_near[i]; - return out; -} - -#ifdef STBI_JPEG_OLD -// this is the same YCbCr-to-RGB calculation that stb_image has used -// historically before the algorithm changes in 1.49 -#define float2fixed(x) ((int) ((x) * 65536 + 0.5)) -static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step) -{ - int i; - for (i=0; i < count; ++i) { - int y_fixed = (y[i] << 16) + 32768; // rounding - int r,g,b; - int cr = pcr[i] - 128; - int cb = pcb[i] - 128; - r = y_fixed + cr*float2fixed(1.40200f); - g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f); - b = y_fixed + cb*float2fixed(1.77200f); - r >>= 16; - g >>= 16; - b >>= 16; - if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } - if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } - if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } - out[0] = (stbi_uc)r; - out[1] = (stbi_uc)g; - out[2] = (stbi_uc)b; - out[3] = 255; - out += step; - } -} -#else -// this is a reduced-precision calculation of YCbCr-to-RGB introduced -// to make sure the code produces the same results in both SIMD and scalar -#define float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) -static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step) -{ - int i; - for (i=0; i < count; ++i) { - int y_fixed = (y[i] << 20) + (1<<19); // rounding - int r,g,b; - int cr = pcr[i] - 128; - int cb = pcb[i] - 128; - r = y_fixed + cr* float2fixed(1.40200f); - g = y_fixed + (cr*-float2fixed(0.71414f)) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); - b = y_fixed + cb* float2fixed(1.77200f); - r >>= 20; - g >>= 20; - b >>= 20; - if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } - if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } - if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } - out[0] = (stbi_uc)r; - out[1] = (stbi_uc)g; - out[2] = (stbi_uc)b; - out[3] = 255; - out += step; - } -} -#endif - -#if defined(STBI_SSE2) || defined(STBI_NEON) -static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step) -{ - int i = 0; - -#ifdef STBI_SSE2 - // step == 3 is pretty ugly on the final interleave, and i'm not convinced - // it's useful in practice (you wouldn't use it for textures, for example). - // so just accelerate step == 4 case. - if (step == 4) { - // this is a fairly straightforward implementation and not super-optimized. - __m128i signflip = _mm_set1_epi8(-0x80); - __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f)); - __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f)); - __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f)); - __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f)); - __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128); - __m128i xw = _mm_set1_epi16(255); // alpha channel - - for (; i+7 < count; i += 8) { - // load - __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i)); - __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i)); - __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i)); - __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128 - __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128 - - // unpack to short (and left-shift cr, cb by 8) - __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes); - __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased); - __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased); - - // color transform - __m128i yws = _mm_srli_epi16(yw, 4); - __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw); - __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw); - __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1); - __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1); - __m128i rws = _mm_add_epi16(cr0, yws); - __m128i gwt = _mm_add_epi16(cb0, yws); - __m128i bws = _mm_add_epi16(yws, cb1); - __m128i gws = _mm_add_epi16(gwt, cr1); - - // descale - __m128i rw = _mm_srai_epi16(rws, 4); - __m128i bw = _mm_srai_epi16(bws, 4); - __m128i gw = _mm_srai_epi16(gws, 4); - - // back to byte, set up for transpose - __m128i brb = _mm_packus_epi16(rw, bw); - __m128i gxb = _mm_packus_epi16(gw, xw); - - // transpose to interleave channels - __m128i t0 = _mm_unpacklo_epi8(brb, gxb); - __m128i t1 = _mm_unpackhi_epi8(brb, gxb); - __m128i o0 = _mm_unpacklo_epi16(t0, t1); - __m128i o1 = _mm_unpackhi_epi16(t0, t1); - - // store - _mm_storeu_si128((__m128i *) (out + 0), o0); - _mm_storeu_si128((__m128i *) (out + 16), o1); - out += 32; - } - } -#endif - -#ifdef STBI_NEON - // in this version, step=3 support would be easy to add. but is there demand? - if (step == 4) { - // this is a fairly straightforward implementation and not super-optimized. - uint8x8_t signflip = vdup_n_u8(0x80); - int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f)); - int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f)); - int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f)); - int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f)); - - for (; i+7 < count; i += 8) { - // load - uint8x8_t y_bytes = vld1_u8(y + i); - uint8x8_t cr_bytes = vld1_u8(pcr + i); - uint8x8_t cb_bytes = vld1_u8(pcb + i); - int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip)); - int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip)); - - // expand to s16 - int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4)); - int16x8_t crw = vshll_n_s8(cr_biased, 7); - int16x8_t cbw = vshll_n_s8(cb_biased, 7); - - // color transform - int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0); - int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0); - int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1); - int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1); - int16x8_t rws = vaddq_s16(yws, cr0); - int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1); - int16x8_t bws = vaddq_s16(yws, cb1); - - // undo scaling, round, convert to byte - uint8x8x4_t o; - o.val[0] = vqrshrun_n_s16(rws, 4); - o.val[1] = vqrshrun_n_s16(gws, 4); - o.val[2] = vqrshrun_n_s16(bws, 4); - o.val[3] = vdup_n_u8(255); - - // store, interleaving r/g/b/a - vst4_u8(out, o); - out += 8*4; - } - } -#endif - - for (; i < count; ++i) { - int y_fixed = (y[i] << 20) + (1<<19); // rounding - int r,g,b; - int cr = pcr[i] - 128; - int cb = pcb[i] - 128; - r = y_fixed + cr* float2fixed(1.40200f); - g = y_fixed + cr*-float2fixed(0.71414f) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); - b = y_fixed + cb* float2fixed(1.77200f); - r >>= 20; - g >>= 20; - b >>= 20; - if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } - if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } - if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } - out[0] = (stbi_uc)r; - out[1] = (stbi_uc)g; - out[2] = (stbi_uc)b; - out[3] = 255; - out += step; - } -} -#endif - -// set up the kernels -static void stbi__setup_jpeg(stbi__jpeg *j) -{ - j->idct_block_kernel = stbi__idct_block; - j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row; - j->resample_row_hv_2_kernel = stbi__resample_row_hv_2; - -#ifdef STBI_SSE2 - if (stbi__sse2_available()) { - j->idct_block_kernel = stbi__idct_simd; - #ifndef STBI_JPEG_OLD - j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; - #endif - j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; - } -#endif - -#ifdef STBI_NEON - j->idct_block_kernel = stbi__idct_simd; - #ifndef STBI_JPEG_OLD - j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; - #endif - j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; -#endif -} - -// clean up the temporary component buffers -static void stbi__cleanup_jpeg(stbi__jpeg *j) -{ - int i; - for (i=0; i < j->s->img_n; ++i) { - if (j->img_comp[i].raw_data) { - STBI_FREE(j->img_comp[i].raw_data); - j->img_comp[i].raw_data = NULL; - j->img_comp[i].data = NULL; - } - if (j->img_comp[i].raw_coeff) { - STBI_FREE(j->img_comp[i].raw_coeff); - j->img_comp[i].raw_coeff = 0; - j->img_comp[i].coeff = 0; - } - if (j->img_comp[i].linebuf) { - STBI_FREE(j->img_comp[i].linebuf); - j->img_comp[i].linebuf = NULL; - } - } -} - -typedef struct -{ - resample_row_func resample; - stbi_uc *line0,*line1; - int hs,vs; // expansion factor in each axis - int w_lores; // horizontal pixels pre-expansion - int ystep; // how far through vertical expansion we are - int ypos; // which pre-expansion row we're on -} stbi__resample; - -static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) -{ - int n, decode_n; - z->s->img_n = 0; // make stbi__cleanup_jpeg safe - - // validate req_comp - if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); - - // load a jpeg image from whichever source, but leave in YCbCr format - if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; } - - // determine actual number of components to generate - n = req_comp ? req_comp : z->s->img_n; - - if (z->s->img_n == 3 && n < 3) - decode_n = 1; - else - decode_n = z->s->img_n; - - // resample and color-convert - { - int k; - unsigned int i,j; - stbi_uc *output; - stbi_uc *coutput[4]; - - stbi__resample res_comp[4]; - - for (k=0; k < decode_n; ++k) { - stbi__resample *r = &res_comp[k]; - - // allocate line buffer big enough for upsampling off the edges - // with upsample factor of 4 - z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3); - if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } - - r->hs = z->img_h_max / z->img_comp[k].h; - r->vs = z->img_v_max / z->img_comp[k].v; - r->ystep = r->vs >> 1; - r->w_lores = (z->s->img_x + r->hs-1) / r->hs; - r->ypos = 0; - r->line0 = r->line1 = z->img_comp[k].data; - - if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; - else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2; - else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2; - else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel; - else r->resample = stbi__resample_row_generic; - } - - // can't error after this so, this is safe - output = (stbi_uc *) stbi__malloc(n * z->s->img_x * z->s->img_y + 1); - if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } - - // now go ahead and resample - for (j=0; j < z->s->img_y; ++j) { - stbi_uc *out = output + n * z->s->img_x * j; - for (k=0; k < decode_n; ++k) { - stbi__resample *r = &res_comp[k]; - int y_bot = r->ystep >= (r->vs >> 1); - coutput[k] = r->resample(z->img_comp[k].linebuf, - y_bot ? r->line1 : r->line0, - y_bot ? r->line0 : r->line1, - r->w_lores, r->hs); - if (++r->ystep >= r->vs) { - r->ystep = 0; - r->line0 = r->line1; - if (++r->ypos < z->img_comp[k].y) - r->line1 += z->img_comp[k].w2; - } - } - if (n >= 3) { - stbi_uc *y = coutput[0]; - if (z->s->img_n == 3) { - z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); - } else - for (i=0; i < z->s->img_x; ++i) { - out[0] = out[1] = out[2] = y[i]; - out[3] = 255; // not used if n==3 - out += n; - } - } else { - stbi_uc *y = coutput[0]; - if (n == 1) - for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; - else - for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255; - } - } - stbi__cleanup_jpeg(z); - *out_x = z->s->img_x; - *out_y = z->s->img_y; - if (comp) *comp = z->s->img_n; // report original components, not output - return output; - } -} - -static unsigned char *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - stbi__jpeg j; - j.s = s; - stbi__setup_jpeg(&j); - return load_jpeg_image(&j, x,y,comp,req_comp); -} - -static int stbi__jpeg_test(stbi__context *s) -{ - int r; - stbi__jpeg j; - j.s = s; - stbi__setup_jpeg(&j); - r = stbi__decode_jpeg_header(&j, STBI__SCAN_type); - stbi__rewind(s); - return r; -} - -static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp) -{ - if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) { - stbi__rewind( j->s ); - return 0; - } - if (x) *x = j->s->img_x; - if (y) *y = j->s->img_y; - if (comp) *comp = j->s->img_n; - return 1; -} - -static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp) -{ - stbi__jpeg j; - j.s = s; - return stbi__jpeg_info_raw(&j, x, y, comp); -} -#endif - -// public domain zlib decode v0.2 Sean Barrett 2006-11-18 -// simple implementation -// - all input must be provided in an upfront buffer -// - all output is written to a single output buffer (can malloc/realloc) -// performance -// - fast huffman - -#ifndef STBI_NO_ZLIB - -// fast-way is faster to check than jpeg huffman, but slow way is slower -#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables -#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1) - -// zlib-style huffman encoding -// (jpegs packs from left, zlib from right, so can't share code) -typedef struct -{ - stbi__uint16 fast[1 << STBI__ZFAST_BITS]; - stbi__uint16 firstcode[16]; - int maxcode[17]; - stbi__uint16 firstsymbol[16]; - stbi_uc size[288]; - stbi__uint16 value[288]; -} stbi__zhuffman; - -stbi_inline static int stbi__bitreverse16(int n) -{ - n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); - n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); - n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); - n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); - return n; -} - -stbi_inline static int stbi__bit_reverse(int v, int bits) -{ - STBI_ASSERT(bits <= 16); - // to bit reverse n bits, reverse 16 and shift - // e.g. 11 bits, bit reverse and shift away 5 - return stbi__bitreverse16(v) >> (16-bits); -} - -static int stbi__zbuild_huffman(stbi__zhuffman *z, stbi_uc *sizelist, int num) -{ - int i,k=0; - int code, next_code[16], sizes[17]; - - // DEFLATE spec for generating codes - memset(sizes, 0, sizeof(sizes)); - memset(z->fast, 0, sizeof(z->fast)); - for (i=0; i < num; ++i) - ++sizes[sizelist[i]]; - sizes[0] = 0; - for (i=1; i < 16; ++i) - if (sizes[i] > (1 << i)) - return stbi__err("bad sizes", "Corrupt PNG"); - code = 0; - for (i=1; i < 16; ++i) { - next_code[i] = code; - z->firstcode[i] = (stbi__uint16) code; - z->firstsymbol[i] = (stbi__uint16) k; - code = (code + sizes[i]); - if (sizes[i]) - if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG"); - z->maxcode[i] = code << (16-i); // preshift for inner loop - code <<= 1; - k += sizes[i]; - } - z->maxcode[16] = 0x10000; // sentinel - for (i=0; i < num; ++i) { - int s = sizelist[i]; - if (s) { - int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; - stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i); - z->size [c] = (stbi_uc ) s; - z->value[c] = (stbi__uint16) i; - if (s <= STBI__ZFAST_BITS) { - int j = stbi__bit_reverse(next_code[s],s); - while (j < (1 << STBI__ZFAST_BITS)) { - z->fast[j] = fastv; - j += (1 << s); - } - } - ++next_code[s]; - } - } - return 1; -} - -// zlib-from-memory implementation for PNG reading -// because PNG allows splitting the zlib stream arbitrarily, -// and it's annoying structurally to have PNG call ZLIB call PNG, -// we require PNG read all the IDATs and combine them into a single -// memory buffer - -typedef struct -{ - stbi_uc *zbuffer, *zbuffer_end; - int num_bits; - stbi__uint32 code_buffer; - - char *zout; - char *zout_start; - char *zout_end; - int z_expandable; - - stbi__zhuffman z_length, z_distance; -} stbi__zbuf; - -stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z) -{ - if (z->zbuffer >= z->zbuffer_end) return 0; - return *z->zbuffer++; -} - -static void stbi__fill_bits(stbi__zbuf *z) -{ - do { - STBI_ASSERT(z->code_buffer < (1U << z->num_bits)); - z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits; - z->num_bits += 8; - } while (z->num_bits <= 24); -} - -stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n) -{ - unsigned int k; - if (z->num_bits < n) stbi__fill_bits(z); - k = z->code_buffer & ((1 << n) - 1); - z->code_buffer >>= n; - z->num_bits -= n; - return k; -} - -static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z) -{ - int b,s,k; - // not resolved by fast table, so compute it the slow way - // use jpeg approach, which requires MSbits at top - k = stbi__bit_reverse(a->code_buffer, 16); - for (s=STBI__ZFAST_BITS+1; ; ++s) - if (k < z->maxcode[s]) - break; - if (s == 16) return -1; // invalid code! - // code size is s, so: - b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; - STBI_ASSERT(z->size[b] == s); - a->code_buffer >>= s; - a->num_bits -= s; - return z->value[b]; -} - -stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z) -{ - int b,s; - if (a->num_bits < 16) stbi__fill_bits(a); - b = z->fast[a->code_buffer & STBI__ZFAST_MASK]; - if (b) { - s = b >> 9; - a->code_buffer >>= s; - a->num_bits -= s; - return b & 511; - } - return stbi__zhuffman_decode_slowpath(a, z); -} - -static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes -{ - char *q; - int cur, limit, old_limit; - z->zout = zout; - if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG"); - cur = (int) (z->zout - z->zout_start); - limit = old_limit = (int) (z->zout_end - z->zout_start); - while (cur + n > limit) - limit *= 2; - q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit); - STBI_NOTUSED(old_limit); - if (q == NULL) return stbi__err("outofmem", "Out of memory"); - z->zout_start = q; - z->zout = q + cur; - z->zout_end = q + limit; - return 1; -} - -static int stbi__zlength_base[31] = { - 3,4,5,6,7,8,9,10,11,13, - 15,17,19,23,27,31,35,43,51,59, - 67,83,99,115,131,163,195,227,258,0,0 }; - -static int stbi__zlength_extra[31]= -{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; - -static int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, -257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; - -static int stbi__zdist_extra[32] = -{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; - -static int stbi__parse_huffman_block(stbi__zbuf *a) -{ - char *zout = a->zout; - for(;;) { - int z = stbi__zhuffman_decode(a, &a->z_length); - if (z < 256) { - if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes - if (zout >= a->zout_end) { - if (!stbi__zexpand(a, zout, 1)) return 0; - zout = a->zout; - } - *zout++ = (char) z; - } else { - stbi_uc *p; - int len,dist; - if (z == 256) { - a->zout = zout; - return 1; - } - z -= 257; - len = stbi__zlength_base[z]; - if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]); - z = stbi__zhuffman_decode(a, &a->z_distance); - if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); - dist = stbi__zdist_base[z]; - if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]); - if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG"); - if (zout + len > a->zout_end) { - if (!stbi__zexpand(a, zout, len)) return 0; - zout = a->zout; - } - p = (stbi_uc *) (zout - dist); - if (dist == 1) { // run of one byte; common in images. - stbi_uc v = *p; - if (len) { do *zout++ = v; while (--len); } - } else { - if (len) { do *zout++ = *p++; while (--len); } - } - } - } -} - -static int stbi__compute_huffman_codes(stbi__zbuf *a) -{ - static stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; - stbi__zhuffman z_codelength; - stbi_uc lencodes[286+32+137];//padding for maximum single op - stbi_uc codelength_sizes[19]; - int i,n; - - int hlit = stbi__zreceive(a,5) + 257; - int hdist = stbi__zreceive(a,5) + 1; - int hclen = stbi__zreceive(a,4) + 4; - - memset(codelength_sizes, 0, sizeof(codelength_sizes)); - for (i=0; i < hclen; ++i) { - int s = stbi__zreceive(a,3); - codelength_sizes[length_dezigzag[i]] = (stbi_uc) s; - } - if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0; - - n = 0; - while (n < hlit + hdist) { - int c = stbi__zhuffman_decode(a, &z_codelength); - if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG"); - if (c < 16) - lencodes[n++] = (stbi_uc) c; - else if (c == 16) { - c = stbi__zreceive(a,2)+3; - memset(lencodes+n, lencodes[n-1], c); - n += c; - } else if (c == 17) { - c = stbi__zreceive(a,3)+3; - memset(lencodes+n, 0, c); - n += c; - } else { - STBI_ASSERT(c == 18); - c = stbi__zreceive(a,7)+11; - memset(lencodes+n, 0, c); - n += c; - } - } - if (n != hlit+hdist) return stbi__err("bad codelengths","Corrupt PNG"); - if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0; - if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0; - return 1; -} - -static int stbi__parse_uncomperssed_block(stbi__zbuf *a) -{ - stbi_uc header[4]; - int len,nlen,k; - if (a->num_bits & 7) - stbi__zreceive(a, a->num_bits & 7); // discard - // drain the bit-packed data into header - k = 0; - while (a->num_bits > 0) { - header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check - a->code_buffer >>= 8; - a->num_bits -= 8; - } - STBI_ASSERT(a->num_bits == 0); - // now fill header the normal way - while (k < 4) - header[k++] = stbi__zget8(a); - len = header[1] * 256 + header[0]; - nlen = header[3] * 256 + header[2]; - if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG"); - if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG"); - if (a->zout + len > a->zout_end) - if (!stbi__zexpand(a, a->zout, len)) return 0; - memcpy(a->zout, a->zbuffer, len); - a->zbuffer += len; - a->zout += len; - return 1; -} - -static int stbi__parse_zlib_header(stbi__zbuf *a) -{ - int cmf = stbi__zget8(a); - int cm = cmf & 15; - /* int cinfo = cmf >> 4; */ - int flg = stbi__zget8(a); - if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec - if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png - if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png - // window = 1 << (8 + cinfo)... but who cares, we fully buffer output - return 1; -} - -// @TODO: should statically initialize these for optimal thread safety -static stbi_uc stbi__zdefault_length[288], stbi__zdefault_distance[32]; -static void stbi__init_zdefaults(void) -{ - int i; // use <= to match clearly with spec - for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8; - for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9; - for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7; - for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8; - - for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5; -} - -static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) -{ - int final, type; - if (parse_header) - if (!stbi__parse_zlib_header(a)) return 0; - a->num_bits = 0; - a->code_buffer = 0; - do { - final = stbi__zreceive(a,1); - type = stbi__zreceive(a,2); - if (type == 0) { - if (!stbi__parse_uncomperssed_block(a)) return 0; - } else if (type == 3) { - return 0; - } else { - if (type == 1) { - // use fixed code lengths - if (!stbi__zdefault_distance[31]) stbi__init_zdefaults(); - if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , 288)) return 0; - if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0; - } else { - if (!stbi__compute_huffman_codes(a)) return 0; - } - if (!stbi__parse_huffman_block(a)) return 0; - } - } while (!final); - return 1; -} - -static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header) -{ - a->zout_start = obuf; - a->zout = obuf; - a->zout_end = obuf + olen; - a->z_expandable = exp; - - return stbi__parse_zlib(a, parse_header); -} - -STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) -{ - stbi__zbuf a; - char *p = (char *) stbi__malloc(initial_size); - if (p == NULL) return NULL; - a.zbuffer = (stbi_uc *) buffer; - a.zbuffer_end = (stbi_uc *) buffer + len; - if (stbi__do_zlib(&a, p, initial_size, 1, 1)) { - if (outlen) *outlen = (int) (a.zout - a.zout_start); - return a.zout_start; - } else { - STBI_FREE(a.zout_start); - return NULL; - } -} - -STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) -{ - return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); -} - -STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header) -{ - stbi__zbuf a; - char *p = (char *) stbi__malloc(initial_size); - if (p == NULL) return NULL; - a.zbuffer = (stbi_uc *) buffer; - a.zbuffer_end = (stbi_uc *) buffer + len; - if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) { - if (outlen) *outlen = (int) (a.zout - a.zout_start); - return a.zout_start; - } else { - STBI_FREE(a.zout_start); - return NULL; - } -} - -STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) -{ - stbi__zbuf a; - a.zbuffer = (stbi_uc *) ibuffer; - a.zbuffer_end = (stbi_uc *) ibuffer + ilen; - if (stbi__do_zlib(&a, obuffer, olen, 0, 1)) - return (int) (a.zout - a.zout_start); - else - return -1; -} - -STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) -{ - stbi__zbuf a; - char *p = (char *) stbi__malloc(16384); - if (p == NULL) return NULL; - a.zbuffer = (stbi_uc *) buffer; - a.zbuffer_end = (stbi_uc *) buffer+len; - if (stbi__do_zlib(&a, p, 16384, 1, 0)) { - if (outlen) *outlen = (int) (a.zout - a.zout_start); - return a.zout_start; - } else { - STBI_FREE(a.zout_start); - return NULL; - } -} - -STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) -{ - stbi__zbuf a; - a.zbuffer = (stbi_uc *) ibuffer; - a.zbuffer_end = (stbi_uc *) ibuffer + ilen; - if (stbi__do_zlib(&a, obuffer, olen, 0, 0)) - return (int) (a.zout - a.zout_start); - else - return -1; -} -#endif - -// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 -// simple implementation -// - only 8-bit samples -// - no CRC checking -// - allocates lots of intermediate memory -// - avoids problem of streaming data between subsystems -// - avoids explicit window management -// performance -// - uses stb_zlib, a PD zlib implementation with fast huffman decoding - -#ifndef STBI_NO_PNG -typedef struct -{ - stbi__uint32 length; - stbi__uint32 type; -} stbi__pngchunk; - -static stbi__pngchunk stbi__get_chunk_header(stbi__context *s) -{ - stbi__pngchunk c; - c.length = stbi__get32be(s); - c.type = stbi__get32be(s); - return c; -} - -static int stbi__check_png_header(stbi__context *s) -{ - static stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 }; - int i; - for (i=0; i < 8; ++i) - if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG"); - return 1; -} - -typedef struct -{ - stbi__context *s; - stbi_uc *idata, *expanded, *out; -} stbi__png; - - -enum { - STBI__F_none=0, - STBI__F_sub=1, - STBI__F_up=2, - STBI__F_avg=3, - STBI__F_paeth=4, - // synthetic filters used for first scanline to avoid needing a dummy row of 0s - STBI__F_avg_first, - STBI__F_paeth_first -}; - -static stbi_uc first_row_filter[5] = -{ - STBI__F_none, - STBI__F_sub, - STBI__F_none, - STBI__F_avg_first, - STBI__F_paeth_first -}; - -static int stbi__paeth(int a, int b, int c) -{ - int p = a + b - c; - int pa = abs(p-a); - int pb = abs(p-b); - int pc = abs(p-c); - if (pa <= pb && pa <= pc) return a; - if (pb <= pc) return b; - return c; -} - -static stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 }; - -// create the png data from post-deflated data -static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color) -{ - stbi__context *s = a->s; - stbi__uint32 i,j,stride = x*out_n; - stbi__uint32 img_len, img_width_bytes; - int k; - int img_n = s->img_n; // copy it into a local for later - - STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1); - a->out = (stbi_uc *) stbi__malloc(x * y * out_n); // extra bytes to write off the end into - if (!a->out) return stbi__err("outofmem", "Out of memory"); - - img_width_bytes = (((img_n * x * depth) + 7) >> 3); - img_len = (img_width_bytes + 1) * y; - if (s->img_x == x && s->img_y == y) { - if (raw_len != img_len) return stbi__err("not enough pixels","Corrupt PNG"); - } else { // interlaced: - if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG"); - } - - for (j=0; j < y; ++j) { - stbi_uc *cur = a->out + stride*j; - stbi_uc *prior = cur - stride; - int filter = *raw++; - int filter_bytes = img_n; - int width = x; - if (filter > 4) - return stbi__err("invalid filter","Corrupt PNG"); - - if (depth < 8) { - STBI_ASSERT(img_width_bytes <= x); - cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place - filter_bytes = 1; - width = img_width_bytes; - } - - // if first row, use special filter that doesn't sample previous row - if (j == 0) filter = first_row_filter[filter]; - - // handle first byte explicitly - for (k=0; k < filter_bytes; ++k) { - switch (filter) { - case STBI__F_none : cur[k] = raw[k]; break; - case STBI__F_sub : cur[k] = raw[k]; break; - case STBI__F_up : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break; - case STBI__F_avg : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break; - case STBI__F_paeth : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break; - case STBI__F_avg_first : cur[k] = raw[k]; break; - case STBI__F_paeth_first: cur[k] = raw[k]; break; - } - } - - if (depth == 8) { - if (img_n != out_n) - cur[img_n] = 255; // first pixel - raw += img_n; - cur += out_n; - prior += out_n; - } else { - raw += 1; - cur += 1; - prior += 1; - } - - // this is a little gross, so that we don't switch per-pixel or per-component - if (depth < 8 || img_n == out_n) { - int nk = (width - 1)*img_n; - #define CASE(f) \ - case f: \ - for (k=0; k < nk; ++k) - switch (filter) { - // "none" filter turns into a memcpy here; make that explicit. - case STBI__F_none: memcpy(cur, raw, nk); break; - CASE(STBI__F_sub) cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); break; - CASE(STBI__F_up) cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break; - CASE(STBI__F_avg) cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); break; - CASE(STBI__F_paeth) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); break; - CASE(STBI__F_avg_first) cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); break; - CASE(STBI__F_paeth_first) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); break; - } - #undef CASE - raw += nk; - } else { - STBI_ASSERT(img_n+1 == out_n); - #define CASE(f) \ - case f: \ - for (i=x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \ - for (k=0; k < img_n; ++k) - switch (filter) { - CASE(STBI__F_none) cur[k] = raw[k]; break; - CASE(STBI__F_sub) cur[k] = STBI__BYTECAST(raw[k] + cur[k-out_n]); break; - CASE(STBI__F_up) cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break; - CASE(STBI__F_avg) cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-out_n])>>1)); break; - CASE(STBI__F_paeth) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],prior[k],prior[k-out_n])); break; - CASE(STBI__F_avg_first) cur[k] = STBI__BYTECAST(raw[k] + (cur[k-out_n] >> 1)); break; - CASE(STBI__F_paeth_first) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],0,0)); break; - } - #undef CASE - } - } - - // we make a separate pass to expand bits to pixels; for performance, - // this could run two scanlines behind the above code, so it won't - // intefere with filtering but will still be in the cache. - if (depth < 8) { - for (j=0; j < y; ++j) { - stbi_uc *cur = a->out + stride*j; - stbi_uc *in = a->out + stride*j + x*out_n - img_width_bytes; - // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit - // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop - stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range - - // note that the final byte might overshoot and write more data than desired. - // we can allocate enough data that this never writes out of memory, but it - // could also overwrite the next scanline. can it overwrite non-empty data - // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel. - // so we need to explicitly clamp the final ones - - if (depth == 4) { - for (k=x*img_n; k >= 2; k-=2, ++in) { - *cur++ = scale * ((*in >> 4) ); - *cur++ = scale * ((*in ) & 0x0f); - } - if (k > 0) *cur++ = scale * ((*in >> 4) ); - } else if (depth == 2) { - for (k=x*img_n; k >= 4; k-=4, ++in) { - *cur++ = scale * ((*in >> 6) ); - *cur++ = scale * ((*in >> 4) & 0x03); - *cur++ = scale * ((*in >> 2) & 0x03); - *cur++ = scale * ((*in ) & 0x03); - } - if (k > 0) *cur++ = scale * ((*in >> 6) ); - if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03); - if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03); - } else if (depth == 1) { - for (k=x*img_n; k >= 8; k-=8, ++in) { - *cur++ = scale * ((*in >> 7) ); - *cur++ = scale * ((*in >> 6) & 0x01); - *cur++ = scale * ((*in >> 5) & 0x01); - *cur++ = scale * ((*in >> 4) & 0x01); - *cur++ = scale * ((*in >> 3) & 0x01); - *cur++ = scale * ((*in >> 2) & 0x01); - *cur++ = scale * ((*in >> 1) & 0x01); - *cur++ = scale * ((*in ) & 0x01); - } - if (k > 0) *cur++ = scale * ((*in >> 7) ); - if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01); - if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01); - if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01); - if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01); - if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01); - if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01); - } - if (img_n != out_n) { - int q; - // insert alpha = 255 - cur = a->out + stride*j; - if (img_n == 1) { - for (q=x-1; q >= 0; --q) { - cur[q*2+1] = 255; - cur[q*2+0] = cur[q]; - } - } else { - STBI_ASSERT(img_n == 3); - for (q=x-1; q >= 0; --q) { - cur[q*4+3] = 255; - cur[q*4+2] = cur[q*3+2]; - cur[q*4+1] = cur[q*3+1]; - cur[q*4+0] = cur[q*3+0]; - } - } - } - } - } - - return 1; -} - -static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced) -{ - stbi_uc *final; - int p; - if (!interlaced) - return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color); - - // de-interlacing - final = (stbi_uc *) stbi__malloc(a->s->img_x * a->s->img_y * out_n); - for (p=0; p < 7; ++p) { - int xorig[] = { 0,4,0,2,0,1,0 }; - int yorig[] = { 0,0,4,0,2,0,1 }; - int xspc[] = { 8,8,4,4,2,2,1 }; - int yspc[] = { 8,8,8,4,4,2,2 }; - int i,j,x,y; - // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 - x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p]; - y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p]; - if (x && y) { - stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y; - if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) { - STBI_FREE(final); - return 0; - } - for (j=0; j < y; ++j) { - for (i=0; i < x; ++i) { - int out_y = j*yspc[p]+yorig[p]; - int out_x = i*xspc[p]+xorig[p]; - memcpy(final + out_y*a->s->img_x*out_n + out_x*out_n, - a->out + (j*x+i)*out_n, out_n); - } - } - STBI_FREE(a->out); - image_data += img_len; - image_data_len -= img_len; - } - } - a->out = final; - - return 1; -} - -static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n) -{ - stbi__context *s = z->s; - stbi__uint32 i, pixel_count = s->img_x * s->img_y; - stbi_uc *p = z->out; - - // compute color-based transparency, assuming we've - // already got 255 as the alpha value in the output - STBI_ASSERT(out_n == 2 || out_n == 4); - - if (out_n == 2) { - for (i=0; i < pixel_count; ++i) { - p[1] = (p[0] == tc[0] ? 0 : 255); - p += 2; - } - } else { - for (i=0; i < pixel_count; ++i) { - if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) - p[3] = 0; - p += 4; - } - } - return 1; -} - -static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n) -{ - stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y; - stbi_uc *p, *temp_out, *orig = a->out; - - p = (stbi_uc *) stbi__malloc(pixel_count * pal_img_n); - if (p == NULL) return stbi__err("outofmem", "Out of memory"); - - // between here and free(out) below, exitting would leak - temp_out = p; - - if (pal_img_n == 3) { - for (i=0; i < pixel_count; ++i) { - int n = orig[i]*4; - p[0] = palette[n ]; - p[1] = palette[n+1]; - p[2] = palette[n+2]; - p += 3; - } - } else { - for (i=0; i < pixel_count; ++i) { - int n = orig[i]*4; - p[0] = palette[n ]; - p[1] = palette[n+1]; - p[2] = palette[n+2]; - p[3] = palette[n+3]; - p += 4; - } - } - STBI_FREE(a->out); - a->out = temp_out; - - STBI_NOTUSED(len); - - return 1; -} - -static int stbi__unpremultiply_on_load = 0; -static int stbi__de_iphone_flag = 0; - -STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) -{ - stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply; -} - -STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) -{ - stbi__de_iphone_flag = flag_true_if_should_convert; -} - -static void stbi__de_iphone(stbi__png *z) -{ - stbi__context *s = z->s; - stbi__uint32 i, pixel_count = s->img_x * s->img_y; - stbi_uc *p = z->out; - - if (s->img_out_n == 3) { // convert bgr to rgb - for (i=0; i < pixel_count; ++i) { - stbi_uc t = p[0]; - p[0] = p[2]; - p[2] = t; - p += 3; - } - } else { - STBI_ASSERT(s->img_out_n == 4); - if (stbi__unpremultiply_on_load) { - // convert bgr to rgb and unpremultiply - for (i=0; i < pixel_count; ++i) { - stbi_uc a = p[3]; - stbi_uc t = p[0]; - if (a) { - p[0] = p[2] * 255 / a; - p[1] = p[1] * 255 / a; - p[2] = t * 255 / a; - } else { - p[0] = p[2]; - p[2] = t; - } - p += 4; - } - } else { - // convert bgr to rgb - for (i=0; i < pixel_count; ++i) { - stbi_uc t = p[0]; - p[0] = p[2]; - p[2] = t; - p += 4; - } - } - } -} - -#define STBI__PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d)) - -static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) -{ - stbi_uc palette[1024], pal_img_n=0; - stbi_uc has_trans=0, tc[3]; - stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0; - int first=1,k,interlace=0, color=0, depth=0, is_iphone=0; - stbi__context *s = z->s; - - z->expanded = NULL; - z->idata = NULL; - z->out = NULL; - - if (!stbi__check_png_header(s)) return 0; - - if (scan == STBI__SCAN_type) return 1; - - for (;;) { - stbi__pngchunk c = stbi__get_chunk_header(s); - switch (c.type) { - case STBI__PNG_TYPE('C','g','B','I'): - is_iphone = 1; - stbi__skip(s, c.length); - break; - case STBI__PNG_TYPE('I','H','D','R'): { - int comp,filter; - if (!first) return stbi__err("multiple IHDR","Corrupt PNG"); - first = 0; - if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG"); - s->img_x = stbi__get32be(s); if (s->img_x > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)"); - s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)"); - depth = stbi__get8(s); if (depth != 1 && depth != 2 && depth != 4 && depth != 8) return stbi__err("1/2/4/8-bit only","PNG not supported: 1/2/4/8-bit only"); - color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG"); - if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG"); - comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG"); - filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG"); - interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG"); - if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG"); - if (!pal_img_n) { - s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); - if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); - if (scan == STBI__SCAN_header) return 1; - } else { - // if paletted, then pal_n is our final components, and - // img_n is # components to decompress/filter. - s->img_n = 1; - if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG"); - // if SCAN_header, have to scan to see if we have a tRNS - } - break; - } - - case STBI__PNG_TYPE('P','L','T','E'): { - if (first) return stbi__err("first not IHDR", "Corrupt PNG"); - if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG"); - pal_len = c.length / 3; - if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG"); - for (i=0; i < pal_len; ++i) { - palette[i*4+0] = stbi__get8(s); - palette[i*4+1] = stbi__get8(s); - palette[i*4+2] = stbi__get8(s); - palette[i*4+3] = 255; - } - break; - } - - case STBI__PNG_TYPE('t','R','N','S'): { - if (first) return stbi__err("first not IHDR", "Corrupt PNG"); - if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG"); - if (pal_img_n) { - if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; } - if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG"); - if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG"); - pal_img_n = 4; - for (i=0; i < c.length; ++i) - palette[i*4+3] = stbi__get8(s); - } else { - if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG"); - if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG"); - has_trans = 1; - for (k=0; k < s->img_n; ++k) - tc[k] = (stbi_uc) (stbi__get16be(s) & 255) * stbi__depth_scale_table[depth]; // non 8-bit images will be larger - } - break; - } - - case STBI__PNG_TYPE('I','D','A','T'): { - if (first) return stbi__err("first not IHDR", "Corrupt PNG"); - if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG"); - if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; } - if ((int)(ioff + c.length) < (int)ioff) return 0; - if (ioff + c.length > idata_limit) { - stbi__uint32 idata_limit_old = idata_limit; - stbi_uc *p; - if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096; - while (ioff + c.length > idata_limit) - idata_limit *= 2; - STBI_NOTUSED(idata_limit_old); - p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory"); - z->idata = p; - } - if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG"); - ioff += c.length; - break; - } - - case STBI__PNG_TYPE('I','E','N','D'): { - stbi__uint32 raw_len, bpl; - if (first) return stbi__err("first not IHDR", "Corrupt PNG"); - if (scan != STBI__SCAN_load) return 1; - if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG"); - // initial guess for decoded data size to avoid unnecessary reallocs - bpl = (s->img_x * depth + 7) / 8; // bytes per line, per component - raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */; - z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone); - if (z->expanded == NULL) return 0; // zlib should set error - STBI_FREE(z->idata); z->idata = NULL; - if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) - s->img_out_n = s->img_n+1; - else - s->img_out_n = s->img_n; - if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, depth, color, interlace)) return 0; - if (has_trans) - if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0; - if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2) - stbi__de_iphone(z); - if (pal_img_n) { - // pal_img_n == 3 or 4 - s->img_n = pal_img_n; // record the actual colors we had - s->img_out_n = pal_img_n; - if (req_comp >= 3) s->img_out_n = req_comp; - if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n)) - return 0; - } - STBI_FREE(z->expanded); z->expanded = NULL; - return 1; - } - - default: - // if critical, fail - if (first) return stbi__err("first not IHDR", "Corrupt PNG"); - if ((c.type & (1 << 29)) == 0) { - #ifndef STBI_NO_FAILURE_STRINGS - // not threadsafe - static char invalid_chunk[] = "XXXX PNG chunk not known"; - invalid_chunk[0] = STBI__BYTECAST(c.type >> 24); - invalid_chunk[1] = STBI__BYTECAST(c.type >> 16); - invalid_chunk[2] = STBI__BYTECAST(c.type >> 8); - invalid_chunk[3] = STBI__BYTECAST(c.type >> 0); - #endif - return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type"); - } - stbi__skip(s, c.length); - break; - } - // end of PNG chunk, read and skip CRC - stbi__get32be(s); - } -} - -static unsigned char *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp) -{ - unsigned char *result=NULL; - if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); - if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) { - result = p->out; - p->out = NULL; - if (req_comp && req_comp != p->s->img_out_n) { - result = stbi__convert_format(result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); - p->s->img_out_n = req_comp; - if (result == NULL) return result; - } - *x = p->s->img_x; - *y = p->s->img_y; - if (n) *n = p->s->img_out_n; - } - STBI_FREE(p->out); p->out = NULL; - STBI_FREE(p->expanded); p->expanded = NULL; - STBI_FREE(p->idata); p->idata = NULL; - - return result; -} - -static unsigned char *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - stbi__png p; - p.s = s; - return stbi__do_png(&p, x,y,comp,req_comp); -} - -static int stbi__png_test(stbi__context *s) -{ - int r; - r = stbi__check_png_header(s); - stbi__rewind(s); - return r; -} - -static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp) -{ - if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) { - stbi__rewind( p->s ); - return 0; - } - if (x) *x = p->s->img_x; - if (y) *y = p->s->img_y; - if (comp) *comp = p->s->img_n; - return 1; -} - -static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp) -{ - stbi__png p; - p.s = s; - return stbi__png_info_raw(&p, x, y, comp); -} -#endif - -// Microsoft/Windows BMP image - -#ifndef STBI_NO_BMP -static int stbi__bmp_test_raw(stbi__context *s) -{ - int r; - int sz; - if (stbi__get8(s) != 'B') return 0; - if (stbi__get8(s) != 'M') return 0; - stbi__get32le(s); // discard filesize - stbi__get16le(s); // discard reserved - stbi__get16le(s); // discard reserved - stbi__get32le(s); // discard data offset - sz = stbi__get32le(s); - r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124); - return r; -} - -static int stbi__bmp_test(stbi__context *s) -{ - int r = stbi__bmp_test_raw(s); - stbi__rewind(s); - return r; -} - - -// returns 0..31 for the highest set bit -static int stbi__high_bit(unsigned int z) -{ - int n=0; - if (z == 0) return -1; - if (z >= 0x10000) n += 16, z >>= 16; - if (z >= 0x00100) n += 8, z >>= 8; - if (z >= 0x00010) n += 4, z >>= 4; - if (z >= 0x00004) n += 2, z >>= 2; - if (z >= 0x00002) n += 1, z >>= 1; - return n; -} - -static int stbi__bitcount(unsigned int a) -{ - a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 - a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 - a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits - a = (a + (a >> 8)); // max 16 per 8 bits - a = (a + (a >> 16)); // max 32 per 8 bits - return a & 0xff; -} - -static int stbi__shiftsigned(int v, int shift, int bits) -{ - int result; - int z=0; - - if (shift < 0) v <<= -shift; - else v >>= shift; - result = v; - - z = bits; - while (z < 8) { - result += v >> z; - z += bits; - } - return result; -} - -typedef struct -{ - int bpp, offset, hsz; - unsigned int mr,mg,mb,ma, all_a; -} stbi__bmp_data; - -static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info) -{ - int hsz; - if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP"); - stbi__get32le(s); // discard filesize - stbi__get16le(s); // discard reserved - stbi__get16le(s); // discard reserved - info->offset = stbi__get32le(s); - info->hsz = hsz = stbi__get32le(s); - - if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown"); - if (hsz == 12) { - s->img_x = stbi__get16le(s); - s->img_y = stbi__get16le(s); - } else { - s->img_x = stbi__get32le(s); - s->img_y = stbi__get32le(s); - } - if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP"); - info->bpp = stbi__get16le(s); - if (info->bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit"); - if (hsz != 12) { - int compress = stbi__get32le(s); - if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE"); - stbi__get32le(s); // discard sizeof - stbi__get32le(s); // discard hres - stbi__get32le(s); // discard vres - stbi__get32le(s); // discard colorsused - stbi__get32le(s); // discard max important - if (hsz == 40 || hsz == 56) { - if (hsz == 56) { - stbi__get32le(s); - stbi__get32le(s); - stbi__get32le(s); - stbi__get32le(s); - } - if (info->bpp == 16 || info->bpp == 32) { - info->mr = info->mg = info->mb = 0; - if (compress == 0) { - if (info->bpp == 32) { - info->mr = 0xffu << 16; - info->mg = 0xffu << 8; - info->mb = 0xffu << 0; - info->ma = 0xffu << 24; - info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0 - } else { - info->mr = 31u << 10; - info->mg = 31u << 5; - info->mb = 31u << 0; - } - } else if (compress == 3) { - info->mr = stbi__get32le(s); - info->mg = stbi__get32le(s); - info->mb = stbi__get32le(s); - // not documented, but generated by photoshop and handled by mspaint - if (info->mr == info->mg && info->mg == info->mb) { - // ?!?!? - return stbi__errpuc("bad BMP", "bad BMP"); - } - } else - return stbi__errpuc("bad BMP", "bad BMP"); - } - } else { - int i; - if (hsz != 108 && hsz != 124) - return stbi__errpuc("bad BMP", "bad BMP"); - info->mr = stbi__get32le(s); - info->mg = stbi__get32le(s); - info->mb = stbi__get32le(s); - info->ma = stbi__get32le(s); - stbi__get32le(s); // discard color space - for (i=0; i < 12; ++i) - stbi__get32le(s); // discard color space parameters - if (hsz == 124) { - stbi__get32le(s); // discard rendering intent - stbi__get32le(s); // discard offset of profile data - stbi__get32le(s); // discard size of profile data - stbi__get32le(s); // discard reserved - } - } - } - return (void *) 1; -} - - -static stbi_uc *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *out; - unsigned int mr=0,mg=0,mb=0,ma=0, all_a; - stbi_uc pal[256][4]; - int psize=0,i,j,width; - int flip_vertically, pad, target; - stbi__bmp_data info; - - info.all_a = 255; - if (stbi__bmp_parse_header(s, &info) == NULL) - return NULL; // error code already set - - flip_vertically = ((int) s->img_y) > 0; - s->img_y = abs((int) s->img_y); - - mr = info.mr; - mg = info.mg; - mb = info.mb; - ma = info.ma; - all_a = info.all_a; - - if (info.hsz == 12) { - if (info.bpp < 24) - psize = (info.offset - 14 - 24) / 3; - } else { - if (info.bpp < 16) - psize = (info.offset - 14 - info.hsz) >> 2; - } - - s->img_n = ma ? 4 : 3; - if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 - target = req_comp; - else - target = s->img_n; // if they want monochrome, we'll post-convert - - out = (stbi_uc *) stbi__malloc(target * s->img_x * s->img_y); - if (!out) return stbi__errpuc("outofmem", "Out of memory"); - if (info.bpp < 16) { - int z=0; - if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); } - for (i=0; i < psize; ++i) { - pal[i][2] = stbi__get8(s); - pal[i][1] = stbi__get8(s); - pal[i][0] = stbi__get8(s); - if (info.hsz != 12) stbi__get8(s); - pal[i][3] = 255; - } - stbi__skip(s, info.offset - 14 - info.hsz - psize * (info.hsz == 12 ? 3 : 4)); - if (info.bpp == 4) width = (s->img_x + 1) >> 1; - else if (info.bpp == 8) width = s->img_x; - else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); } - pad = (-width)&3; - for (j=0; j < (int) s->img_y; ++j) { - for (i=0; i < (int) s->img_x; i += 2) { - int v=stbi__get8(s),v2=0; - if (info.bpp == 4) { - v2 = v & 15; - v >>= 4; - } - out[z++] = pal[v][0]; - out[z++] = pal[v][1]; - out[z++] = pal[v][2]; - if (target == 4) out[z++] = 255; - if (i+1 == (int) s->img_x) break; - v = (info.bpp == 8) ? stbi__get8(s) : v2; - out[z++] = pal[v][0]; - out[z++] = pal[v][1]; - out[z++] = pal[v][2]; - if (target == 4) out[z++] = 255; - } - stbi__skip(s, pad); - } - } else { - int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; - int z = 0; - int easy=0; - stbi__skip(s, info.offset - 14 - info.hsz); - if (info.bpp == 24) width = 3 * s->img_x; - else if (info.bpp == 16) width = 2*s->img_x; - else /* bpp = 32 and pad = 0 */ width=0; - pad = (-width) & 3; - if (info.bpp == 24) { - easy = 1; - } else if (info.bpp == 32) { - if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000) - easy = 2; - } - if (!easy) { - if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); } - // right shift amt to put high bit in position #7 - rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr); - gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg); - bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb); - ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma); - } - for (j=0; j < (int) s->img_y; ++j) { - if (easy) { - for (i=0; i < (int) s->img_x; ++i) { - unsigned char a; - out[z+2] = stbi__get8(s); - out[z+1] = stbi__get8(s); - out[z+0] = stbi__get8(s); - z += 3; - a = (easy == 2 ? stbi__get8(s) : 255); - all_a |= a; - if (target == 4) out[z++] = a; - } - } else { - int bpp = info.bpp; - for (i=0; i < (int) s->img_x; ++i) { - stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s)); - int a; - out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount)); - out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount)); - out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount)); - a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255); - all_a |= a; - if (target == 4) out[z++] = STBI__BYTECAST(a); - } - } - stbi__skip(s, pad); - } - } - - // if alpha channel is all 0s, replace with all 255s - if (target == 4 && all_a == 0) - for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4) - out[i] = 255; - - if (flip_vertically) { - stbi_uc t; - for (j=0; j < (int) s->img_y>>1; ++j) { - stbi_uc *p1 = out + j *s->img_x*target; - stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target; - for (i=0; i < (int) s->img_x*target; ++i) { - t = p1[i], p1[i] = p2[i], p2[i] = t; - } - } - } - - if (req_comp && req_comp != target) { - out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y); - if (out == NULL) return out; // stbi__convert_format frees input on failure - } - - *x = s->img_x; - *y = s->img_y; - if (comp) *comp = s->img_n; - return out; -} -#endif - -// Targa Truevision - TGA -// by Jonathan Dummer -#ifndef STBI_NO_TGA -// returns STBI_rgb or whatever, 0 on error -static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16) -{ - // only RGB or RGBA (incl. 16bit) or grey allowed - if(is_rgb16) *is_rgb16 = 0; - switch(bits_per_pixel) { - case 8: return STBI_grey; - case 16: if(is_grey) return STBI_grey_alpha; - // else: fall-through - case 15: if(is_rgb16) *is_rgb16 = 1; - return STBI_rgb; - case 24: // fall-through - case 32: return bits_per_pixel/8; - default: return 0; - } -} - -static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp) -{ - int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp; - int sz, tga_colormap_type; - stbi__get8(s); // discard Offset - tga_colormap_type = stbi__get8(s); // colormap type - if( tga_colormap_type > 1 ) { - stbi__rewind(s); - return 0; // only RGB or indexed allowed - } - tga_image_type = stbi__get8(s); // image type - if ( tga_colormap_type == 1 ) { // colormapped (paletted) image - if (tga_image_type != 1 && tga_image_type != 9) { - stbi__rewind(s); - return 0; - } - stbi__skip(s,4); // skip index of first colormap entry and number of entries - sz = stbi__get8(s); // check bits per palette color entry - if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) { - stbi__rewind(s); - return 0; - } - stbi__skip(s,4); // skip image x and y origin - tga_colormap_bpp = sz; - } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE - if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) { - stbi__rewind(s); - return 0; // only RGB or grey allowed, +/- RLE - } - stbi__skip(s,9); // skip colormap specification and image x/y origin - tga_colormap_bpp = 0; - } - tga_w = stbi__get16le(s); - if( tga_w < 1 ) { - stbi__rewind(s); - return 0; // test width - } - tga_h = stbi__get16le(s); - if( tga_h < 1 ) { - stbi__rewind(s); - return 0; // test height - } - tga_bits_per_pixel = stbi__get8(s); // bits per pixel - stbi__get8(s); // ignore alpha bits - if (tga_colormap_bpp != 0) { - if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) { - // when using a colormap, tga_bits_per_pixel is the size of the indexes - // I don't think anything but 8 or 16bit indexes makes sense - stbi__rewind(s); - return 0; - } - tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL); - } else { - tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL); - } - if(!tga_comp) { - stbi__rewind(s); - return 0; - } - if (x) *x = tga_w; - if (y) *y = tga_h; - if (comp) *comp = tga_comp; - return 1; // seems to have passed everything -} - -static int stbi__tga_test(stbi__context *s) -{ - int res = 0; - int sz, tga_color_type; - stbi__get8(s); // discard Offset - tga_color_type = stbi__get8(s); // color type - if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed - sz = stbi__get8(s); // image type - if ( tga_color_type == 1 ) { // colormapped (paletted) image - if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9 - stbi__skip(s,4); // skip index of first colormap entry and number of entries - sz = stbi__get8(s); // check bits per palette color entry - if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; - stbi__skip(s,4); // skip image x and y origin - } else { // "normal" image w/o colormap - if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE - stbi__skip(s,9); // skip colormap specification and image x/y origin - } - if ( stbi__get16le(s) < 1 ) goto errorEnd; // test width - if ( stbi__get16le(s) < 1 ) goto errorEnd; // test height - sz = stbi__get8(s); // bits per pixel - if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index - if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; - - res = 1; // if we got this far, everything's good and we can return 1 instead of 0 - -errorEnd: - stbi__rewind(s); - return res; -} - -// read 16bit value and convert to 24bit RGB -void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out) -{ - stbi__uint16 px = stbi__get16le(s); - stbi__uint16 fiveBitMask = 31; - // we have 3 channels with 5bits each - int r = (px >> 10) & fiveBitMask; - int g = (px >> 5) & fiveBitMask; - int b = px & fiveBitMask; - // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later - out[0] = (r * 255)/31; - out[1] = (g * 255)/31; - out[2] = (b * 255)/31; - - // some people claim that the most significant bit might be used for alpha - // (possibly if an alpha-bit is set in the "image descriptor byte") - // but that only made 16bit test images completely translucent.. - // so let's treat all 15 and 16bit TGAs as RGB with no alpha. -} - -static stbi_uc *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - // read in the TGA header stuff - int tga_offset = stbi__get8(s); - int tga_indexed = stbi__get8(s); - int tga_image_type = stbi__get8(s); - int tga_is_RLE = 0; - int tga_palette_start = stbi__get16le(s); - int tga_palette_len = stbi__get16le(s); - int tga_palette_bits = stbi__get8(s); - int tga_x_origin = stbi__get16le(s); - int tga_y_origin = stbi__get16le(s); - int tga_width = stbi__get16le(s); - int tga_height = stbi__get16le(s); - int tga_bits_per_pixel = stbi__get8(s); - int tga_comp, tga_rgb16=0; - int tga_inverted = stbi__get8(s); - // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?) - // image data - unsigned char *tga_data; - unsigned char *tga_palette = NULL; - int i, j; - unsigned char raw_data[4]; - int RLE_count = 0; - int RLE_repeating = 0; - int read_next_pixel = 1; - - // do a tiny bit of precessing - if ( tga_image_type >= 8 ) - { - tga_image_type -= 8; - tga_is_RLE = 1; - } - tga_inverted = 1 - ((tga_inverted >> 5) & 1); - - // If I'm paletted, then I'll use the number of bits from the palette - if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16); - else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16); - - if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency - return stbi__errpuc("bad format", "Can't find out TGA pixelformat"); - - // tga info - *x = tga_width; - *y = tga_height; - if (comp) *comp = tga_comp; - - tga_data = (unsigned char*)stbi__malloc( (size_t)tga_width * tga_height * tga_comp ); - if (!tga_data) return stbi__errpuc("outofmem", "Out of memory"); - - // skip to the data's starting position (offset usually = 0) - stbi__skip(s, tga_offset ); - - if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) { - for (i=0; i < tga_height; ++i) { - int row = tga_inverted ? tga_height -i - 1 : i; - stbi_uc *tga_row = tga_data + row*tga_width*tga_comp; - stbi__getn(s, tga_row, tga_width * tga_comp); - } - } else { - // do I need to load a palette? - if ( tga_indexed) - { - // any data to skip? (offset usually = 0) - stbi__skip(s, tga_palette_start ); - // load the palette - tga_palette = (unsigned char*)stbi__malloc( tga_palette_len * tga_comp ); - if (!tga_palette) { - STBI_FREE(tga_data); - return stbi__errpuc("outofmem", "Out of memory"); - } - if (tga_rgb16) { - stbi_uc *pal_entry = tga_palette; - STBI_ASSERT(tga_comp == STBI_rgb); - for (i=0; i < tga_palette_len; ++i) { - stbi__tga_read_rgb16(s, pal_entry); - pal_entry += tga_comp; - } - } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) { - STBI_FREE(tga_data); - STBI_FREE(tga_palette); - return stbi__errpuc("bad palette", "Corrupt TGA"); - } - } - // load the data - for (i=0; i < tga_width * tga_height; ++i) - { - // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk? - if ( tga_is_RLE ) - { - if ( RLE_count == 0 ) - { - // yep, get the next byte as a RLE command - int RLE_cmd = stbi__get8(s); - RLE_count = 1 + (RLE_cmd & 127); - RLE_repeating = RLE_cmd >> 7; - read_next_pixel = 1; - } else if ( !RLE_repeating ) - { - read_next_pixel = 1; - } - } else - { - read_next_pixel = 1; - } - // OK, if I need to read a pixel, do it now - if ( read_next_pixel ) - { - // load however much data we did have - if ( tga_indexed ) - { - // read in index, then perform the lookup - int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s); - if ( pal_idx >= tga_palette_len ) { - // invalid index - pal_idx = 0; - } - pal_idx *= tga_comp; - for (j = 0; j < tga_comp; ++j) { - raw_data[j] = tga_palette[pal_idx+j]; - } - } else if(tga_rgb16) { - STBI_ASSERT(tga_comp == STBI_rgb); - stbi__tga_read_rgb16(s, raw_data); - } else { - // read in the data raw - for (j = 0; j < tga_comp; ++j) { - raw_data[j] = stbi__get8(s); - } - } - // clear the reading flag for the next pixel - read_next_pixel = 0; - } // end of reading a pixel - - // copy data - for (j = 0; j < tga_comp; ++j) - tga_data[i*tga_comp+j] = raw_data[j]; - - // in case we're in RLE mode, keep counting down - --RLE_count; - } - // do I need to invert the image? - if ( tga_inverted ) - { - for (j = 0; j*2 < tga_height; ++j) - { - int index1 = j * tga_width * tga_comp; - int index2 = (tga_height - 1 - j) * tga_width * tga_comp; - for (i = tga_width * tga_comp; i > 0; --i) - { - unsigned char temp = tga_data[index1]; - tga_data[index1] = tga_data[index2]; - tga_data[index2] = temp; - ++index1; - ++index2; - } - } - } - // clear my palette, if I had one - if ( tga_palette != NULL ) - { - STBI_FREE( tga_palette ); - } - } - - // swap RGB - if the source data was RGB16, it already is in the right order - if (tga_comp >= 3 && !tga_rgb16) - { - unsigned char* tga_pixel = tga_data; - for (i=0; i < tga_width * tga_height; ++i) - { - unsigned char temp = tga_pixel[0]; - tga_pixel[0] = tga_pixel[2]; - tga_pixel[2] = temp; - tga_pixel += tga_comp; - } - } - - // convert to target component count - if (req_comp && req_comp != tga_comp) - tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height); - - // the things I do to get rid of an error message, and yet keep - // Microsoft's C compilers happy... [8^( - tga_palette_start = tga_palette_len = tga_palette_bits = - tga_x_origin = tga_y_origin = 0; - // OK, done - return tga_data; -} -#endif - -// ************************************************************************************************* -// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB - -#ifndef STBI_NO_PSD -static int stbi__psd_test(stbi__context *s) -{ - int r = (stbi__get32be(s) == 0x38425053); - stbi__rewind(s); - return r; -} - -static stbi_uc *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - int pixelCount; - int channelCount, compression; - int channel, i, count, len; - int bitdepth; - int w,h; - stbi_uc *out; - - // Check identifier - if (stbi__get32be(s) != 0x38425053) // "8BPS" - return stbi__errpuc("not PSD", "Corrupt PSD image"); - - // Check file type version. - if (stbi__get16be(s) != 1) - return stbi__errpuc("wrong version", "Unsupported version of PSD image"); - - // Skip 6 reserved bytes. - stbi__skip(s, 6 ); - - // Read the number of channels (R, G, B, A, etc). - channelCount = stbi__get16be(s); - if (channelCount < 0 || channelCount > 16) - return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image"); - - // Read the rows and columns of the image. - h = stbi__get32be(s); - w = stbi__get32be(s); - - // Make sure the depth is 8 bits. - bitdepth = stbi__get16be(s); - if (bitdepth != 8 && bitdepth != 16) - return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit"); - - // Make sure the color mode is RGB. - // Valid options are: - // 0: Bitmap - // 1: Grayscale - // 2: Indexed color - // 3: RGB color - // 4: CMYK color - // 7: Multichannel - // 8: Duotone - // 9: Lab color - if (stbi__get16be(s) != 3) - return stbi__errpuc("wrong color format", "PSD is not in RGB color format"); - - // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) - stbi__skip(s,stbi__get32be(s) ); - - // Skip the image resources. (resolution, pen tool paths, etc) - stbi__skip(s, stbi__get32be(s) ); - - // Skip the reserved data. - stbi__skip(s, stbi__get32be(s) ); - - // Find out if the data is compressed. - // Known values: - // 0: no compression - // 1: RLE compressed - compression = stbi__get16be(s); - if (compression > 1) - return stbi__errpuc("bad compression", "PSD has an unknown compression format"); - - // Create the destination image. - out = (stbi_uc *) stbi__malloc(4 * w*h); - if (!out) return stbi__errpuc("outofmem", "Out of memory"); - pixelCount = w*h; - - // Initialize the data to zero. - //memset( out, 0, pixelCount * 4 ); - - // Finally, the image data. - if (compression) { - // RLE as used by .PSD and .TIFF - // Loop until you get the number of unpacked bytes you are expecting: - // Read the next source byte into n. - // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. - // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. - // Else if n is 128, noop. - // Endloop - - // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data, - // which we're going to just skip. - stbi__skip(s, h * channelCount * 2 ); - - // Read the RLE data by channel. - for (channel = 0; channel < 4; channel++) { - stbi_uc *p; - - p = out+channel; - if (channel >= channelCount) { - // Fill this channel with default data. - for (i = 0; i < pixelCount; i++, p += 4) - *p = (channel == 3 ? 255 : 0); - } else { - // Read the RLE data. - count = 0; - while (count < pixelCount) { - len = stbi__get8(s); - if (len == 128) { - // No-op. - } else if (len < 128) { - // Copy next len+1 bytes literally. - len++; - count += len; - while (len) { - *p = stbi__get8(s); - p += 4; - len--; - } - } else if (len > 128) { - stbi_uc val; - // Next -len+1 bytes in the dest are replicated from next source byte. - // (Interpret len as a negative 8-bit int.) - len ^= 0x0FF; - len += 2; - val = stbi__get8(s); - count += len; - while (len) { - *p = val; - p += 4; - len--; - } - } - } - } - } - - } else { - // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) - // where each channel consists of an 8-bit value for each pixel in the image. - - // Read the data by channel. - for (channel = 0; channel < 4; channel++) { - stbi_uc *p; - - p = out + channel; - if (channel >= channelCount) { - // Fill this channel with default data. - stbi_uc val = channel == 3 ? 255 : 0; - for (i = 0; i < pixelCount; i++, p += 4) - *p = val; - } else { - // Read the data. - if (bitdepth == 16) { - for (i = 0; i < pixelCount; i++, p += 4) - *p = (stbi_uc) (stbi__get16be(s) >> 8); - } else { - for (i = 0; i < pixelCount; i++, p += 4) - *p = stbi__get8(s); - } - } - } - } - - if (req_comp && req_comp != 4) { - out = stbi__convert_format(out, 4, req_comp, w, h); - if (out == NULL) return out; // stbi__convert_format frees input on failure - } - - if (comp) *comp = 4; - *y = h; - *x = w; - - return out; -} -#endif - -// ************************************************************************************************* -// Softimage PIC loader -// by Tom Seddon -// -// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format -// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ - -#ifndef STBI_NO_PIC -static int stbi__pic_is4(stbi__context *s,const char *str) -{ - int i; - for (i=0; i<4; ++i) - if (stbi__get8(s) != (stbi_uc)str[i]) - return 0; - - return 1; -} - -static int stbi__pic_test_core(stbi__context *s) -{ - int i; - - if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) - return 0; - - for(i=0;i<84;++i) - stbi__get8(s); - - if (!stbi__pic_is4(s,"PICT")) - return 0; - - return 1; -} - -typedef struct -{ - stbi_uc size,type,channel; -} stbi__pic_packet; - -static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest) -{ - int mask=0x80, i; - - for (i=0; i<4; ++i, mask>>=1) { - if (channel & mask) { - if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short"); - dest[i]=stbi__get8(s); - } - } - - return dest; -} - -static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src) -{ - int mask=0x80,i; - - for (i=0;i<4; ++i, mask>>=1) - if (channel&mask) - dest[i]=src[i]; -} - -static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result) -{ - int act_comp=0,num_packets=0,y,chained; - stbi__pic_packet packets[10]; - - // this will (should...) cater for even some bizarre stuff like having data - // for the same channel in multiple packets. - do { - stbi__pic_packet *packet; - - if (num_packets==sizeof(packets)/sizeof(packets[0])) - return stbi__errpuc("bad format","too many packets"); - - packet = &packets[num_packets++]; - - chained = stbi__get8(s); - packet->size = stbi__get8(s); - packet->type = stbi__get8(s); - packet->channel = stbi__get8(s); - - act_comp |= packet->channel; - - if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (reading packets)"); - if (packet->size != 8) return stbi__errpuc("bad format","packet isn't 8bpp"); - } while (chained); - - *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel? - - for(y=0; ytype) { - default: - return stbi__errpuc("bad format","packet has bad compression type"); - - case 0: {//uncompressed - int x; - - for(x=0;xchannel,dest)) - return 0; - break; - } - - case 1://Pure RLE - { - int left=width, i; - - while (left>0) { - stbi_uc count,value[4]; - - count=stbi__get8(s); - if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)"); - - if (count > left) - count = (stbi_uc) left; - - if (!stbi__readval(s,packet->channel,value)) return 0; - - for(i=0; ichannel,dest,value); - left -= count; - } - } - break; - - case 2: {//Mixed RLE - int left=width; - while (left>0) { - int count = stbi__get8(s), i; - if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)"); - - if (count >= 128) { // Repeated - stbi_uc value[4]; - - if (count==128) - count = stbi__get16be(s); - else - count -= 127; - if (count > left) - return stbi__errpuc("bad file","scanline overrun"); - - if (!stbi__readval(s,packet->channel,value)) - return 0; - - for(i=0;ichannel,dest,value); - } else { // Raw - ++count; - if (count>left) return stbi__errpuc("bad file","scanline overrun"); - - for(i=0;ichannel,dest)) - return 0; - } - left-=count; - } - break; - } - } - } - } - - return result; -} - -static stbi_uc *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp) -{ - stbi_uc *result; - int i, x,y; - - for (i=0; i<92; ++i) - stbi__get8(s); - - x = stbi__get16be(s); - y = stbi__get16be(s); - if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)"); - if ((1 << 28) / x < y) return stbi__errpuc("too large", "Image too large to decode"); - - stbi__get32be(s); //skip `ratio' - stbi__get16be(s); //skip `fields' - stbi__get16be(s); //skip `pad' - - // intermediate buffer is RGBA - result = (stbi_uc *) stbi__malloc(x*y*4); - memset(result, 0xff, x*y*4); - - if (!stbi__pic_load_core(s,x,y,comp, result)) { - STBI_FREE(result); - result=0; - } - *px = x; - *py = y; - if (req_comp == 0) req_comp = *comp; - result=stbi__convert_format(result,4,req_comp,x,y); - - return result; -} - -static int stbi__pic_test(stbi__context *s) -{ - int r = stbi__pic_test_core(s); - stbi__rewind(s); - return r; -} -#endif - -// ************************************************************************************************* -// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb - -#ifndef STBI_NO_GIF -typedef struct -{ - stbi__int16 prefix; - stbi_uc first; - stbi_uc suffix; -} stbi__gif_lzw; - -typedef struct -{ - int w,h; - stbi_uc *out, *old_out; // output buffer (always 4 components) - int flags, bgindex, ratio, transparent, eflags, delay; - stbi_uc pal[256][4]; - stbi_uc lpal[256][4]; - stbi__gif_lzw codes[4096]; - stbi_uc *color_table; - int parse, step; - int lflags; - int start_x, start_y; - int max_x, max_y; - int cur_x, cur_y; - int line_size; -} stbi__gif; - -static int stbi__gif_test_raw(stbi__context *s) -{ - int sz; - if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0; - sz = stbi__get8(s); - if (sz != '9' && sz != '7') return 0; - if (stbi__get8(s) != 'a') return 0; - return 1; -} - -static int stbi__gif_test(stbi__context *s) -{ - int r = stbi__gif_test_raw(s); - stbi__rewind(s); - return r; -} - -static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp) -{ - int i; - for (i=0; i < num_entries; ++i) { - pal[i][2] = stbi__get8(s); - pal[i][1] = stbi__get8(s); - pal[i][0] = stbi__get8(s); - pal[i][3] = transp == i ? 0 : 255; - } -} - -static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info) -{ - stbi_uc version; - if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') - return stbi__err("not GIF", "Corrupt GIF"); - - version = stbi__get8(s); - if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF"); - if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF"); - - stbi__g_failure_reason = ""; - g->w = stbi__get16le(s); - g->h = stbi__get16le(s); - g->flags = stbi__get8(s); - g->bgindex = stbi__get8(s); - g->ratio = stbi__get8(s); - g->transparent = -1; - - if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments - - if (is_info) return 1; - - if (g->flags & 0x80) - stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1); - - return 1; -} - -static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp) -{ - stbi__gif g; - if (!stbi__gif_header(s, &g, comp, 1)) { - stbi__rewind( s ); - return 0; - } - if (x) *x = g.w; - if (y) *y = g.h; - return 1; -} - -static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code) -{ - stbi_uc *p, *c; - - // recurse to decode the prefixes, since the linked-list is backwards, - // and working backwards through an interleaved image would be nasty - if (g->codes[code].prefix >= 0) - stbi__out_gif_code(g, g->codes[code].prefix); - - if (g->cur_y >= g->max_y) return; - - p = &g->out[g->cur_x + g->cur_y]; - c = &g->color_table[g->codes[code].suffix * 4]; - - if (c[3] >= 128) { - p[0] = c[2]; - p[1] = c[1]; - p[2] = c[0]; - p[3] = c[3]; - } - g->cur_x += 4; - - if (g->cur_x >= g->max_x) { - g->cur_x = g->start_x; - g->cur_y += g->step; - - while (g->cur_y >= g->max_y && g->parse > 0) { - g->step = (1 << g->parse) * g->line_size; - g->cur_y = g->start_y + (g->step >> 1); - --g->parse; - } - } -} - -static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g) -{ - stbi_uc lzw_cs; - stbi__int32 len, init_code; - stbi__uint32 first; - stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; - stbi__gif_lzw *p; - - lzw_cs = stbi__get8(s); - if (lzw_cs > 12) return NULL; - clear = 1 << lzw_cs; - first = 1; - codesize = lzw_cs + 1; - codemask = (1 << codesize) - 1; - bits = 0; - valid_bits = 0; - for (init_code = 0; init_code < clear; init_code++) { - g->codes[init_code].prefix = -1; - g->codes[init_code].first = (stbi_uc) init_code; - g->codes[init_code].suffix = (stbi_uc) init_code; - } - - // support no starting clear code - avail = clear+2; - oldcode = -1; - - len = 0; - for(;;) { - if (valid_bits < codesize) { - if (len == 0) { - len = stbi__get8(s); // start new block - if (len == 0) - return g->out; - } - --len; - bits |= (stbi__int32) stbi__get8(s) << valid_bits; - valid_bits += 8; - } else { - stbi__int32 code = bits & codemask; - bits >>= codesize; - valid_bits -= codesize; - // @OPTIMIZE: is there some way we can accelerate the non-clear path? - if (code == clear) { // clear code - codesize = lzw_cs + 1; - codemask = (1 << codesize) - 1; - avail = clear + 2; - oldcode = -1; - first = 0; - } else if (code == clear + 1) { // end of stream code - stbi__skip(s, len); - while ((len = stbi__get8(s)) > 0) - stbi__skip(s,len); - return g->out; - } else if (code <= avail) { - if (first) return stbi__errpuc("no clear code", "Corrupt GIF"); - - if (oldcode >= 0) { - p = &g->codes[avail++]; - if (avail > 4096) return stbi__errpuc("too many codes", "Corrupt GIF"); - p->prefix = (stbi__int16) oldcode; - p->first = g->codes[oldcode].first; - p->suffix = (code == avail) ? p->first : g->codes[code].first; - } else if (code == avail) - return stbi__errpuc("illegal code in raster", "Corrupt GIF"); - - stbi__out_gif_code(g, (stbi__uint16) code); - - if ((avail & codemask) == 0 && avail <= 0x0FFF) { - codesize++; - codemask = (1 << codesize) - 1; - } - - oldcode = code; - } else { - return stbi__errpuc("illegal code in raster", "Corrupt GIF"); - } - } - } -} - -static void stbi__fill_gif_background(stbi__gif *g, int x0, int y0, int x1, int y1) -{ - int x, y; - stbi_uc *c = g->pal[g->bgindex]; - for (y = y0; y < y1; y += 4 * g->w) { - for (x = x0; x < x1; x += 4) { - stbi_uc *p = &g->out[y + x]; - p[0] = c[2]; - p[1] = c[1]; - p[2] = c[0]; - p[3] = 0; - } - } -} - -// this function is designed to support animated gifs, although stb_image doesn't support it -static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp) -{ - int i; - stbi_uc *prev_out = 0; - - if (g->out == 0 && !stbi__gif_header(s, g, comp,0)) - return 0; // stbi__g_failure_reason set by stbi__gif_header - - prev_out = g->out; - g->out = (stbi_uc *) stbi__malloc(4 * g->w * g->h); - if (g->out == 0) return stbi__errpuc("outofmem", "Out of memory"); - - switch ((g->eflags & 0x1C) >> 2) { - case 0: // unspecified (also always used on 1st frame) - stbi__fill_gif_background(g, 0, 0, 4 * g->w, 4 * g->w * g->h); - break; - case 1: // do not dispose - if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h); - g->old_out = prev_out; - break; - case 2: // dispose to background - if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h); - stbi__fill_gif_background(g, g->start_x, g->start_y, g->max_x, g->max_y); - break; - case 3: // dispose to previous - if (g->old_out) { - for (i = g->start_y; i < g->max_y; i += 4 * g->w) - memcpy(&g->out[i + g->start_x], &g->old_out[i + g->start_x], g->max_x - g->start_x); - } - break; - } - - for (;;) { - switch (stbi__get8(s)) { - case 0x2C: /* Image Descriptor */ - { - int prev_trans = -1; - stbi__int32 x, y, w, h; - stbi_uc *o; - - x = stbi__get16le(s); - y = stbi__get16le(s); - w = stbi__get16le(s); - h = stbi__get16le(s); - if (((x + w) > (g->w)) || ((y + h) > (g->h))) - return stbi__errpuc("bad Image Descriptor", "Corrupt GIF"); - - g->line_size = g->w * 4; - g->start_x = x * 4; - g->start_y = y * g->line_size; - g->max_x = g->start_x + w * 4; - g->max_y = g->start_y + h * g->line_size; - g->cur_x = g->start_x; - g->cur_y = g->start_y; - - g->lflags = stbi__get8(s); - - if (g->lflags & 0x40) { - g->step = 8 * g->line_size; // first interlaced spacing - g->parse = 3; - } else { - g->step = g->line_size; - g->parse = 0; - } - - if (g->lflags & 0x80) { - stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1); - g->color_table = (stbi_uc *) g->lpal; - } else if (g->flags & 0x80) { - if (g->transparent >= 0 && (g->eflags & 0x01)) { - prev_trans = g->pal[g->transparent][3]; - g->pal[g->transparent][3] = 0; - } - g->color_table = (stbi_uc *) g->pal; - } else - return stbi__errpuc("missing color table", "Corrupt GIF"); - - o = stbi__process_gif_raster(s, g); - if (o == NULL) return NULL; - - if (prev_trans != -1) - g->pal[g->transparent][3] = (stbi_uc) prev_trans; - - return o; - } - - case 0x21: // Comment Extension. - { - int len; - if (stbi__get8(s) == 0xF9) { // Graphic Control Extension. - len = stbi__get8(s); - if (len == 4) { - g->eflags = stbi__get8(s); - g->delay = stbi__get16le(s); - g->transparent = stbi__get8(s); - } else { - stbi__skip(s, len); - break; - } - } - while ((len = stbi__get8(s)) != 0) - stbi__skip(s, len); - break; - } - - case 0x3B: // gif stream termination code - return (stbi_uc *) s; // using '1' causes warning on some compilers - - default: - return stbi__errpuc("unknown code", "Corrupt GIF"); - } - } - - STBI_NOTUSED(req_comp); -} - -static stbi_uc *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *u = 0; - stbi__gif g; - memset(&g, 0, sizeof(g)); - - u = stbi__gif_load_next(s, &g, comp, req_comp); - if (u == (stbi_uc *) s) u = 0; // end of animated gif marker - if (u) { - *x = g.w; - *y = g.h; - if (req_comp && req_comp != 4) - u = stbi__convert_format(u, 4, req_comp, g.w, g.h); - } - else if (g.out) - STBI_FREE(g.out); - - return u; -} - -static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp) -{ - return stbi__gif_info_raw(s,x,y,comp); -} -#endif - -// ************************************************************************************************* -// Radiance RGBE HDR loader -// originally by Nicolas Schulz -#ifndef STBI_NO_HDR -static int stbi__hdr_test_core(stbi__context *s) -{ - const char *signature = "#?RADIANCE\n"; - int i; - for (i=0; signature[i]; ++i) - if (stbi__get8(s) != signature[i]) - return 0; - return 1; -} - -static int stbi__hdr_test(stbi__context* s) -{ - int r = stbi__hdr_test_core(s); - stbi__rewind(s); - return r; -} - -#define STBI__HDR_BUFLEN 1024 -static char *stbi__hdr_gettoken(stbi__context *z, char *buffer) -{ - int len=0; - char c = '\0'; - - c = (char) stbi__get8(z); - - while (!stbi__at_eof(z) && c != '\n') { - buffer[len++] = c; - if (len == STBI__HDR_BUFLEN-1) { - // flush to end of line - while (!stbi__at_eof(z) && stbi__get8(z) != '\n') - ; - break; - } - c = (char) stbi__get8(z); - } - - buffer[len] = 0; - return buffer; -} - -static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp) -{ - if ( input[3] != 0 ) { - float f1; - // Exponent - f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); - if (req_comp <= 2) - output[0] = (input[0] + input[1] + input[2]) * f1 / 3; - else { - output[0] = input[0] * f1; - output[1] = input[1] * f1; - output[2] = input[2] * f1; - } - if (req_comp == 2) output[1] = 1; - if (req_comp == 4) output[3] = 1; - } else { - switch (req_comp) { - case 4: output[3] = 1; /* fallthrough */ - case 3: output[0] = output[1] = output[2] = 0; - break; - case 2: output[1] = 1; /* fallthrough */ - case 1: output[0] = 0; - break; - } - } -} - -static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - char buffer[STBI__HDR_BUFLEN]; - char *token; - int valid = 0; - int width, height; - stbi_uc *scanline; - float *hdr_data; - int len; - unsigned char count, value; - int i, j, k, c1,c2, z; - - - // Check identifier - if (strcmp(stbi__hdr_gettoken(s,buffer), "#?RADIANCE") != 0) - return stbi__errpf("not HDR", "Corrupt HDR image"); - - // Parse header - for(;;) { - token = stbi__hdr_gettoken(s,buffer); - if (token[0] == 0) break; - if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; - } - - if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format"); - - // Parse width and height - // can't use sscanf() if we're not using stdio! - token = stbi__hdr_gettoken(s,buffer); - if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); - token += 3; - height = (int) strtol(token, &token, 10); - while (*token == ' ') ++token; - if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); - token += 3; - width = (int) strtol(token, NULL, 10); - - *x = width; - *y = height; - - if (comp) *comp = 3; - if (req_comp == 0) req_comp = 3; - - // Read data - hdr_data = (float *) stbi__malloc(height * width * req_comp * sizeof(float)); - - // Load image data - // image data is stored as some number of sca - if ( width < 8 || width >= 32768) { - // Read flat data - for (j=0; j < height; ++j) { - for (i=0; i < width; ++i) { - stbi_uc rgbe[4]; - main_decode_loop: - stbi__getn(s, rgbe, 4); - stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp); - } - } - } else { - // Read RLE-encoded data - scanline = NULL; - - for (j = 0; j < height; ++j) { - c1 = stbi__get8(s); - c2 = stbi__get8(s); - len = stbi__get8(s); - if (c1 != 2 || c2 != 2 || (len & 0x80)) { - // not run-length encoded, so we have to actually use THIS data as a decoded - // pixel (note this can't be a valid pixel--one of RGB must be >= 128) - stbi_uc rgbe[4]; - rgbe[0] = (stbi_uc) c1; - rgbe[1] = (stbi_uc) c2; - rgbe[2] = (stbi_uc) len; - rgbe[3] = (stbi_uc) stbi__get8(s); - stbi__hdr_convert(hdr_data, rgbe, req_comp); - i = 1; - j = 0; - STBI_FREE(scanline); - goto main_decode_loop; // yes, this makes no sense - } - len <<= 8; - len |= stbi__get8(s); - if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); } - if (scanline == NULL) scanline = (stbi_uc *) stbi__malloc(width * 4); - - for (k = 0; k < 4; ++k) { - i = 0; - while (i < width) { - count = stbi__get8(s); - if (count > 128) { - // Run - value = stbi__get8(s); - count -= 128; - for (z = 0; z < count; ++z) - scanline[i++ * 4 + k] = value; - } else { - // Dump - for (z = 0; z < count; ++z) - scanline[i++ * 4 + k] = stbi__get8(s); - } - } - } - for (i=0; i < width; ++i) - stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp); - } - STBI_FREE(scanline); - } - - return hdr_data; -} - -static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp) -{ - char buffer[STBI__HDR_BUFLEN]; - char *token; - int valid = 0; - - if (stbi__hdr_test(s) == 0) { - stbi__rewind( s ); - return 0; - } - - for(;;) { - token = stbi__hdr_gettoken(s,buffer); - if (token[0] == 0) break; - if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; - } - - if (!valid) { - stbi__rewind( s ); - return 0; - } - token = stbi__hdr_gettoken(s,buffer); - if (strncmp(token, "-Y ", 3)) { - stbi__rewind( s ); - return 0; - } - token += 3; - *y = (int) strtol(token, &token, 10); - while (*token == ' ') ++token; - if (strncmp(token, "+X ", 3)) { - stbi__rewind( s ); - return 0; - } - token += 3; - *x = (int) strtol(token, NULL, 10); - *comp = 3; - return 1; -} -#endif // STBI_NO_HDR - -#ifndef STBI_NO_BMP -static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp) -{ - void *p; - stbi__bmp_data info; - - info.all_a = 255; - p = stbi__bmp_parse_header(s, &info); - stbi__rewind( s ); - if (p == NULL) - return 0; - *x = s->img_x; - *y = s->img_y; - *comp = info.ma ? 4 : 3; - return 1; -} -#endif - -#ifndef STBI_NO_PSD -static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) -{ - int channelCount; - if (stbi__get32be(s) != 0x38425053) { - stbi__rewind( s ); - return 0; - } - if (stbi__get16be(s) != 1) { - stbi__rewind( s ); - return 0; - } - stbi__skip(s, 6); - channelCount = stbi__get16be(s); - if (channelCount < 0 || channelCount > 16) { - stbi__rewind( s ); - return 0; - } - *y = stbi__get32be(s); - *x = stbi__get32be(s); - if (stbi__get16be(s) != 8) { - stbi__rewind( s ); - return 0; - } - if (stbi__get16be(s) != 3) { - stbi__rewind( s ); - return 0; - } - *comp = 4; - return 1; -} -#endif - -#ifndef STBI_NO_PIC -static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp) -{ - int act_comp=0,num_packets=0,chained; - stbi__pic_packet packets[10]; - - if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) { - stbi__rewind(s); - return 0; - } - - stbi__skip(s, 88); - - *x = stbi__get16be(s); - *y = stbi__get16be(s); - if (stbi__at_eof(s)) { - stbi__rewind( s); - return 0; - } - if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) { - stbi__rewind( s ); - return 0; - } - - stbi__skip(s, 8); - - do { - stbi__pic_packet *packet; - - if (num_packets==sizeof(packets)/sizeof(packets[0])) - return 0; - - packet = &packets[num_packets++]; - chained = stbi__get8(s); - packet->size = stbi__get8(s); - packet->type = stbi__get8(s); - packet->channel = stbi__get8(s); - act_comp |= packet->channel; - - if (stbi__at_eof(s)) { - stbi__rewind( s ); - return 0; - } - if (packet->size != 8) { - stbi__rewind( s ); - return 0; - } - } while (chained); - - *comp = (act_comp & 0x10 ? 4 : 3); - - return 1; -} -#endif - -// ************************************************************************************************* -// Portable Gray Map and Portable Pixel Map loader -// by Ken Miller -// -// PGM: http://netpbm.sourceforge.net/doc/pgm.html -// PPM: http://netpbm.sourceforge.net/doc/ppm.html -// -// Known limitations: -// Does not support comments in the header section -// Does not support ASCII image data (formats P2 and P3) -// Does not support 16-bit-per-channel - -#ifndef STBI_NO_PNM - -static int stbi__pnm_test(stbi__context *s) -{ - char p, t; - p = (char) stbi__get8(s); - t = (char) stbi__get8(s); - if (p != 'P' || (t != '5' && t != '6')) { - stbi__rewind( s ); - return 0; - } - return 1; -} - -static stbi_uc *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *out; - if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n)) - return 0; - *x = s->img_x; - *y = s->img_y; - *comp = s->img_n; - - out = (stbi_uc *) stbi__malloc(s->img_n * s->img_x * s->img_y); - if (!out) return stbi__errpuc("outofmem", "Out of memory"); - stbi__getn(s, out, s->img_n * s->img_x * s->img_y); - - if (req_comp && req_comp != s->img_n) { - out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y); - if (out == NULL) return out; // stbi__convert_format frees input on failure - } - return out; -} - -static int stbi__pnm_isspace(char c) -{ - return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r'; -} - -static void stbi__pnm_skip_whitespace(stbi__context *s, char *c) -{ - for (;;) { - while (!stbi__at_eof(s) && stbi__pnm_isspace(*c)) - *c = (char) stbi__get8(s); - - if (stbi__at_eof(s) || *c != '#') - break; - - while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' ) - *c = (char) stbi__get8(s); - } -} - -static int stbi__pnm_isdigit(char c) -{ - return c >= '0' && c <= '9'; -} - -static int stbi__pnm_getinteger(stbi__context *s, char *c) -{ - int value = 0; - - while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) { - value = value*10 + (*c - '0'); - *c = (char) stbi__get8(s); - } - - return value; -} - -static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp) -{ - int maxv; - char c, p, t; - - stbi__rewind( s ); - - // Get identifier - p = (char) stbi__get8(s); - t = (char) stbi__get8(s); - if (p != 'P' || (t != '5' && t != '6')) { - stbi__rewind( s ); - return 0; - } - - *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm - - c = (char) stbi__get8(s); - stbi__pnm_skip_whitespace(s, &c); - - *x = stbi__pnm_getinteger(s, &c); // read width - stbi__pnm_skip_whitespace(s, &c); - - *y = stbi__pnm_getinteger(s, &c); // read height - stbi__pnm_skip_whitespace(s, &c); - - maxv = stbi__pnm_getinteger(s, &c); // read max value - - if (maxv > 255) - return stbi__err("max value > 255", "PPM image not 8-bit"); - else - return 1; -} -#endif - -static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp) -{ - #ifndef STBI_NO_JPEG - if (stbi__jpeg_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_PNG - if (stbi__png_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_GIF - if (stbi__gif_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_BMP - if (stbi__bmp_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_PSD - if (stbi__psd_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_PIC - if (stbi__pic_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_PNM - if (stbi__pnm_info(s, x, y, comp)) return 1; - #endif - - #ifndef STBI_NO_HDR - if (stbi__hdr_info(s, x, y, comp)) return 1; - #endif - - // test tga last because it's a crappy test! - #ifndef STBI_NO_TGA - if (stbi__tga_info(s, x, y, comp)) - return 1; - #endif - return stbi__err("unknown image type", "Image not of any known type, or corrupt"); -} - -#ifndef STBI_NO_STDIO -STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp) -{ - FILE *f = stbi__fopen(filename, "rb"); - int result; - if (!f) return stbi__err("can't fopen", "Unable to open file"); - result = stbi_info_from_file(f, x, y, comp); - fclose(f); - return result; -} - -STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) -{ - int r; - stbi__context s; - long pos = ftell(f); - stbi__start_file(&s, f); - r = stbi__info_main(&s,x,y,comp); - fseek(f,pos,SEEK_SET); - return r; -} -#endif // !STBI_NO_STDIO - -STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) -{ - stbi__context s; - stbi__start_mem(&s,buffer,len); - return stbi__info_main(&s,x,y,comp); -} - -STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp) -{ - stbi__context s; - stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); - return stbi__info_main(&s,x,y,comp); -} - -#endif // STB_IMAGE_IMPLEMENTATION - -/* - revision history: - 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED - 2.09 (2016-01-16) allow comments in PNM files - 16-bit-per-pixel TGA (not bit-per-component) - info() for TGA could break due to .hdr handling - info() for BMP to shares code instead of sloppy parse - can use STBI_REALLOC_SIZED if allocator doesn't support realloc - code cleanup - 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA - 2.07 (2015-09-13) fix compiler warnings - partial animated GIF support - limited 16-bpc PSD support - #ifdef unused functions - bug with < 92 byte PIC,PNM,HDR,TGA - 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value - 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning - 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit - 2.03 (2015-04-12) extra corruption checking (mmozeiko) - stbi_set_flip_vertically_on_load (nguillemot) - fix NEON support; fix mingw support - 2.02 (2015-01-19) fix incorrect assert, fix warning - 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2 - 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG - 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) - progressive JPEG (stb) - PGM/PPM support (Ken Miller) - STBI_MALLOC,STBI_REALLOC,STBI_FREE - GIF bugfix -- seemingly never worked - STBI_NO_*, STBI_ONLY_* - 1.48 (2014-12-14) fix incorrectly-named assert() - 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb) - optimize PNG (ryg) - fix bug in interlaced PNG with user-specified channel count (stb) - 1.46 (2014-08-26) - fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG - 1.45 (2014-08-16) - fix MSVC-ARM internal compiler error by wrapping malloc - 1.44 (2014-08-07) - various warning fixes from Ronny Chevalier - 1.43 (2014-07-15) - fix MSVC-only compiler problem in code changed in 1.42 - 1.42 (2014-07-09) - don't define _CRT_SECURE_NO_WARNINGS (affects user code) - fixes to stbi__cleanup_jpeg path - added STBI_ASSERT to avoid requiring assert.h - 1.41 (2014-06-25) - fix search&replace from 1.36 that messed up comments/error messages - 1.40 (2014-06-22) - fix gcc struct-initialization warning - 1.39 (2014-06-15) - fix to TGA optimization when req_comp != number of components in TGA; - fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite) - add support for BMP version 5 (more ignored fields) - 1.38 (2014-06-06) - suppress MSVC warnings on integer casts truncating values - fix accidental rename of 'skip' field of I/O - 1.37 (2014-06-04) - remove duplicate typedef - 1.36 (2014-06-03) - convert to header file single-file library - if de-iphone isn't set, load iphone images color-swapped instead of returning NULL - 1.35 (2014-05-27) - various warnings - fix broken STBI_SIMD path - fix bug where stbi_load_from_file no longer left file pointer in correct place - fix broken non-easy path for 32-bit BMP (possibly never used) - TGA optimization by Arseny Kapoulkine - 1.34 (unknown) - use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case - 1.33 (2011-07-14) - make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements - 1.32 (2011-07-13) - support for "info" function for all supported filetypes (SpartanJ) - 1.31 (2011-06-20) - a few more leak fixes, bug in PNG handling (SpartanJ) - 1.30 (2011-06-11) - added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) - removed deprecated format-specific test/load functions - removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway - error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) - fix inefficiency in decoding 32-bit BMP (David Woo) - 1.29 (2010-08-16) - various warning fixes from Aurelien Pocheville - 1.28 (2010-08-01) - fix bug in GIF palette transparency (SpartanJ) - 1.27 (2010-08-01) - cast-to-stbi_uc to fix warnings - 1.26 (2010-07-24) - fix bug in file buffering for PNG reported by SpartanJ - 1.25 (2010-07-17) - refix trans_data warning (Won Chun) - 1.24 (2010-07-12) - perf improvements reading from files on platforms with lock-heavy fgetc() - minor perf improvements for jpeg - deprecated type-specific functions so we'll get feedback if they're needed - attempt to fix trans_data warning (Won Chun) - 1.23 fixed bug in iPhone support - 1.22 (2010-07-10) - removed image *writing* support - stbi_info support from Jetro Lauha - GIF support from Jean-Marc Lienher - iPhone PNG-extensions from James Brown - warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva) - 1.21 fix use of 'stbi_uc' in header (reported by jon blow) - 1.20 added support for Softimage PIC, by Tom Seddon - 1.19 bug in interlaced PNG corruption check (found by ryg) - 1.18 (2008-08-02) - fix a threading bug (local mutable static) - 1.17 support interlaced PNG - 1.16 major bugfix - stbi__convert_format converted one too many pixels - 1.15 initialize some fields for thread safety - 1.14 fix threadsafe conversion bug - header-file-only version (#define STBI_HEADER_FILE_ONLY before including) - 1.13 threadsafe - 1.12 const qualifiers in the API - 1.11 Support installable IDCT, colorspace conversion routines - 1.10 Fixes for 64-bit (don't use "unsigned long") - optimized upsampling by Fabian "ryg" Giesen - 1.09 Fix format-conversion for PSD code (bad global variables!) - 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz - 1.07 attempt to fix C++ warning/errors again - 1.06 attempt to fix C++ warning/errors again - 1.05 fix TGA loading to return correct *comp and use good luminance calc - 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free - 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR - 1.02 support for (subset of) HDR files, float interface for preferred access to them - 1.01 fix bug: possible bug in handling right-side up bmps... not sure - fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all - 1.00 interface to zlib that skips zlib header - 0.99 correct handling of alpha in palette - 0.98 TGA loader by lonesock; dynamically add loaders (untested) - 0.97 jpeg errors on too large a file; also catch another malloc failure - 0.96 fix detection of invalid v value - particleman@mollyrocket forum - 0.95 during header scan, seek to markers in case of padding - 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same - 0.93 handle jpegtran output; verbose errors - 0.92 read 4,8,16,24,32-bit BMP files of several formats - 0.91 output 24-bit Windows 3.0 BMP files - 0.90 fix a few more warnings; bump version number to approach 1.0 - 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd - 0.60 fix compiling as c++ - 0.59 fix warnings: merge Dave Moore's -Wall fixes - 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian - 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available - 0.56 fix bug: zlib uncompressed mode len vs. nlen - 0.55 fix bug: restart_interval not initialized to 0 - 0.54 allow NULL for 'int *comp' - 0.53 fix bug in png 3->4; speedup png decoding - 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments - 0.51 obey req_comp requests, 1-component jpegs return as 1-component, - on 'test' only check type, not whether we support this variant - 0.50 (2006-11-19) - first released version -*/ diff --git a/third_party/nanovg/stb_truetype.h b/third_party/nanovg/stb_truetype.h deleted file mode 100644 index 62595a15fd..0000000000 --- a/third_party/nanovg/stb_truetype.h +++ /dev/null @@ -1,5011 +0,0 @@ -// stb_truetype.h - v1.24 - public domain -// authored from 2009-2020 by Sean Barrett / RAD Game Tools -// -// ======================================================================= -// -// NO SECURITY GUARANTEE -- DO NOT USE THIS ON UNTRUSTED FONT FILES -// -// This library does no range checking of the offsets found in the file, -// meaning an attacker can use it to read arbitrary memory. -// -// ======================================================================= -// -// This library processes TrueType files: -// parse files -// extract glyph metrics -// extract glyph shapes -// render glyphs to one-channel bitmaps with antialiasing (box filter) -// render glyphs to one-channel SDF bitmaps (signed-distance field/function) -// -// Todo: -// non-MS cmaps -// crashproof on bad data -// hinting? (no longer patented) -// cleartype-style AA? -// optimize: use simple memory allocator for intermediates -// optimize: build edge-list directly from curves -// optimize: rasterize directly from curves? -// -// ADDITIONAL CONTRIBUTORS -// -// Mikko Mononen: compound shape support, more cmap formats -// Tor Andersson: kerning, subpixel rendering -// Dougall Johnson: OpenType / Type 2 font handling -// Daniel Ribeiro Maciel: basic GPOS-based kerning -// -// Misc other: -// Ryan Gordon -// Simon Glass -// github:IntellectualKitty -// Imanol Celaya -// Daniel Ribeiro Maciel -// -// Bug/warning reports/fixes: -// "Zer" on mollyrocket Fabian "ryg" Giesen github:NiLuJe -// Cass Everitt Martins Mozeiko github:aloucks -// stoiko (Haemimont Games) Cap Petschulat github:oyvindjam -// Brian Hook Omar Cornut github:vassvik -// Walter van Niftrik Ryan Griege -// David Gow Peter LaValle -// David Given Sergey Popov -// Ivan-Assen Ivanov Giumo X. Clanjor -// Anthony Pesch Higor Euripedes -// Johan Duparc Thomas Fields -// Hou Qiming Derek Vinyard -// Rob Loach Cort Stratton -// Kenney Phillis Jr. Brian Costabile -// Ken Voskuil (kaesve) -// -// VERSION HISTORY -// -// 1.24 (2020-02-05) fix warning -// 1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS) -// 1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined -// 1.21 (2019-02-25) fix warning -// 1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics() -// 1.19 (2018-02-11) GPOS kerning, STBTT_fmod -// 1.18 (2018-01-29) add missing function -// 1.17 (2017-07-23) make more arguments const; doc fix -// 1.16 (2017-07-12) SDF support -// 1.15 (2017-03-03) make more arguments const -// 1.14 (2017-01-16) num-fonts-in-TTC function -// 1.13 (2017-01-02) support OpenType fonts, certain Apple fonts -// 1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual -// 1.11 (2016-04-02) fix unused-variable warning -// 1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef -// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly -// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges -// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints; -// variant PackFontRanges to pack and render in separate phases; -// fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?); -// fixed an assert() bug in the new rasterizer -// replace assert() with STBTT_assert() in new rasterizer -// -// Full history can be found at the end of this file. -// -// LICENSE -// -// See end of file for license information. -// -// USAGE -// -// Include this file in whatever places need to refer to it. In ONE C/C++ -// file, write: -// #define STB_TRUETYPE_IMPLEMENTATION -// before the #include of this file. This expands out the actual -// implementation into that C/C++ file. -// -// To make the implementation private to the file that generates the implementation, -// #define STBTT_STATIC -// -// Simple 3D API (don't ship this, but it's fine for tools and quick start) -// stbtt_BakeFontBitmap() -- bake a font to a bitmap for use as texture -// stbtt_GetBakedQuad() -- compute quad to draw for a given char -// -// Improved 3D API (more shippable): -// #include "stb_rect_pack.h" -- optional, but you really want it -// stbtt_PackBegin() -// stbtt_PackSetOversampling() -- for improved quality on small fonts -// stbtt_PackFontRanges() -- pack and renders -// stbtt_PackEnd() -// stbtt_GetPackedQuad() -// -// "Load" a font file from a memory buffer (you have to keep the buffer loaded) -// stbtt_InitFont() -// stbtt_GetFontOffsetForIndex() -- indexing for TTC font collections -// stbtt_GetNumberOfFonts() -- number of fonts for TTC font collections -// -// Render a unicode codepoint to a bitmap -// stbtt_GetCodepointBitmap() -- allocates and returns a bitmap -// stbtt_MakeCodepointBitmap() -- renders into bitmap you provide -// stbtt_GetCodepointBitmapBox() -- how big the bitmap must be -// -// Character advance/positioning -// stbtt_GetCodepointHMetrics() -// stbtt_GetFontVMetrics() -// stbtt_GetFontVMetricsOS2() -// stbtt_GetCodepointKernAdvance() -// -// Starting with version 1.06, the rasterizer was replaced with a new, -// faster and generally-more-precise rasterizer. The new rasterizer more -// accurately measures pixel coverage for anti-aliasing, except in the case -// where multiple shapes overlap, in which case it overestimates the AA pixel -// coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If -// this turns out to be a problem, you can re-enable the old rasterizer with -// #define STBTT_RASTERIZER_VERSION 1 -// which will incur about a 15% speed hit. -// -// ADDITIONAL DOCUMENTATION -// -// Immediately after this block comment are a series of sample programs. -// -// After the sample programs is the "header file" section. This section -// includes documentation for each API function. -// -// Some important concepts to understand to use this library: -// -// Codepoint -// Characters are defined by unicode codepoints, e.g. 65 is -// uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is -// the hiragana for "ma". -// -// Glyph -// A visual character shape (every codepoint is rendered as -// some glyph) -// -// Glyph index -// A font-specific integer ID representing a glyph -// -// Baseline -// Glyph shapes are defined relative to a baseline, which is the -// bottom of uppercase characters. Characters extend both above -// and below the baseline. -// -// Current Point -// As you draw text to the screen, you keep track of a "current point" -// which is the origin of each character. The current point's vertical -// position is the baseline. Even "baked fonts" use this model. -// -// Vertical Font Metrics -// The vertical qualities of the font, used to vertically position -// and space the characters. See docs for stbtt_GetFontVMetrics. -// -// Font Size in Pixels or Points -// The preferred interface for specifying font sizes in stb_truetype -// is to specify how tall the font's vertical extent should be in pixels. -// If that sounds good enough, skip the next paragraph. -// -// Most font APIs instead use "points", which are a common typographic -// measurement for describing font size, defined as 72 points per inch. -// stb_truetype provides a point API for compatibility. However, true -// "per inch" conventions don't make much sense on computer displays -// since different monitors have different number of pixels per -// inch. For example, Windows traditionally uses a convention that -// there are 96 pixels per inch, thus making 'inch' measurements have -// nothing to do with inches, and thus effectively defining a point to -// be 1.333 pixels. Additionally, the TrueType font data provides -// an explicit scale factor to scale a given font's glyphs to points, -// but the author has observed that this scale factor is often wrong -// for non-commercial fonts, thus making fonts scaled in points -// according to the TrueType spec incoherently sized in practice. -// -// DETAILED USAGE: -// -// Scale: -// Select how high you want the font to be, in points or pixels. -// Call ScaleForPixelHeight or ScaleForMappingEmToPixels to compute -// a scale factor SF that will be used by all other functions. -// -// Baseline: -// You need to select a y-coordinate that is the baseline of where -// your text will appear. Call GetFontBoundingBox to get the baseline-relative -// bounding box for all characters. SF*-y0 will be the distance in pixels -// that the worst-case character could extend above the baseline, so if -// you want the top edge of characters to appear at the top of the -// screen where y=0, then you would set the baseline to SF*-y0. -// -// Current point: -// Set the current point where the first character will appear. The -// first character could extend left of the current point; this is font -// dependent. You can either choose a current point that is the leftmost -// point and hope, or add some padding, or check the bounding box or -// left-side-bearing of the first character to be displayed and set -// the current point based on that. -// -// Displaying a character: -// Compute the bounding box of the character. It will contain signed values -// relative to . I.e. if it returns x0,y0,x1,y1, -// then the character should be displayed in the rectangle from -// to = 32 && *text < 128) { - stbtt_aligned_quad q; - stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9 - glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0); - glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0); - glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1); - glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1); - } - ++text; - } - glEnd(); -} -#endif -// -// -////////////////////////////////////////////////////////////////////////////// -// -// Complete program (this compiles): get a single bitmap, print as ASCII art -// -#if 0 -#include -#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation -#include "stb_truetype.h" - -char ttf_buffer[1<<25]; - -int main(int argc, char **argv) -{ - stbtt_fontinfo font; - unsigned char *bitmap; - int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20); - - fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb")); - - stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0)); - bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0); - - for (j=0; j < h; ++j) { - for (i=0; i < w; ++i) - putchar(" .:ioVM@"[bitmap[j*w+i]>>5]); - putchar('\n'); - } - return 0; -} -#endif -// -// Output: -// -// .ii. -// @@@@@@. -// V@Mio@@o -// :i. V@V -// :oM@@M -// :@@@MM@M -// @@o o@M -// :@@. M@M -// @@@o@@@@ -// :M@@V:@@. -// -////////////////////////////////////////////////////////////////////////////// -// -// Complete program: print "Hello World!" banner, with bugs -// -#if 0 -char buffer[24<<20]; -unsigned char screen[20][79]; - -int main(int arg, char **argv) -{ - stbtt_fontinfo font; - int i,j,ascent,baseline,ch=0; - float scale, xpos=2; // leave a little padding in case the character extends left - char *text = "Heljo World!"; // intentionally misspelled to show 'lj' brokenness - - fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb")); - stbtt_InitFont(&font, buffer, 0); - - scale = stbtt_ScaleForPixelHeight(&font, 15); - stbtt_GetFontVMetrics(&font, &ascent,0,0); - baseline = (int) (ascent*scale); - - while (text[ch]) { - int advance,lsb,x0,y0,x1,y1; - float x_shift = xpos - (float) floor(xpos); - stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb); - stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1); - stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]); - // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong - // because this API is really for baking character bitmaps into textures. if you want to render - // a sequence of characters, you really need to render each bitmap to a temp buffer, then - // "alpha blend" that into the working buffer - xpos += (advance * scale); - if (text[ch+1]) - xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]); - ++ch; - } - - for (j=0; j < 20; ++j) { - for (i=0; i < 78; ++i) - putchar(" .:ioVM@"[screen[j][i]>>5]); - putchar('\n'); - } - - return 0; -} -#endif - - -////////////////////////////////////////////////////////////////////////////// -////////////////////////////////////////////////////////////////////////////// -//// -//// INTEGRATION WITH YOUR CODEBASE -//// -//// The following sections allow you to supply alternate definitions -//// of C library functions used by stb_truetype, e.g. if you don't -//// link with the C runtime library. - -#ifdef STB_TRUETYPE_IMPLEMENTATION - // #define your own (u)stbtt_int8/16/32 before including to override this - #ifndef stbtt_uint8 - typedef unsigned char stbtt_uint8; - typedef signed char stbtt_int8; - typedef unsigned short stbtt_uint16; - typedef signed short stbtt_int16; - typedef unsigned int stbtt_uint32; - typedef signed int stbtt_int32; - #endif - - typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1]; - typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1]; - - // e.g. #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h - #ifndef STBTT_ifloor - #include - #define STBTT_ifloor(x) ((int) floor(x)) - #define STBTT_iceil(x) ((int) ceil(x)) - #endif - - #ifndef STBTT_sqrt - #include - #define STBTT_sqrt(x) sqrt(x) - #define STBTT_pow(x,y) pow(x,y) - #endif - - #ifndef STBTT_fmod - #include - #define STBTT_fmod(x,y) fmod(x,y) - #endif - - #ifndef STBTT_cos - #include - #define STBTT_cos(x) cos(x) - #define STBTT_acos(x) acos(x) - #endif - - #ifndef STBTT_fabs - #include - #define STBTT_fabs(x) fabs(x) - #endif - - // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h - #ifndef STBTT_malloc - #include - #define STBTT_malloc(x,u) ((void)(u),malloc(x)) - #define STBTT_free(x,u) ((void)(u),free(x)) - #endif - - #ifndef STBTT_assert - #include - #define STBTT_assert(x) assert(x) - #endif - - #ifndef STBTT_strlen - #include - #define STBTT_strlen(x) strlen(x) - #endif - - #ifndef STBTT_memcpy - #include - #define STBTT_memcpy memcpy - #define STBTT_memset memset - #endif -#endif - -/////////////////////////////////////////////////////////////////////////////// -/////////////////////////////////////////////////////////////////////////////// -//// -//// INTERFACE -//// -//// - -#ifndef __STB_INCLUDE_STB_TRUETYPE_H__ -#define __STB_INCLUDE_STB_TRUETYPE_H__ - -#ifdef STBTT_STATIC -#define STBTT_DEF static -#else -#define STBTT_DEF extern -#endif - -#ifdef __cplusplus -extern "C" { -#endif - -// private structure -typedef struct -{ - unsigned char *data; - int cursor; - int size; -} stbtt__buf; - -////////////////////////////////////////////////////////////////////////////// -// -// TEXTURE BAKING API -// -// If you use this API, you only have to call two functions ever. -// - -typedef struct -{ - unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap - float xoff,yoff,xadvance; -} stbtt_bakedchar; - -STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf) - float pixel_height, // height of font in pixels - unsigned char *pixels, int pw, int ph, // bitmap to be filled in - int first_char, int num_chars, // characters to bake - stbtt_bakedchar *chardata); // you allocate this, it's num_chars long -// if return is positive, the first unused row of the bitmap -// if return is negative, returns the negative of the number of characters that fit -// if return is 0, no characters fit and no rows were used -// This uses a very crappy packing. - -typedef struct -{ - float x0,y0,s0,t0; // top-left - float x1,y1,s1,t1; // bottom-right -} stbtt_aligned_quad; - -STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, // same data as above - int char_index, // character to display - float *xpos, float *ypos, // pointers to current position in screen pixel space - stbtt_aligned_quad *q, // output: quad to draw - int opengl_fillrule); // true if opengl fill rule; false if DX9 or earlier -// Call GetBakedQuad with char_index = 'character - first_char', and it -// creates the quad you need to draw and advances the current position. -// -// The coordinate system used assumes y increases downwards. -// -// Characters will extend both above and below the current position; -// see discussion of "BASELINE" above. -// -// It's inefficient; you might want to c&p it and optimize it. - -STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap); -// Query the font vertical metrics without having to create a font first. - - -////////////////////////////////////////////////////////////////////////////// -// -// NEW TEXTURE BAKING API -// -// This provides options for packing multiple fonts into one atlas, not -// perfectly but better than nothing. - -typedef struct -{ - unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap - float xoff,yoff,xadvance; - float xoff2,yoff2; -} stbtt_packedchar; - -typedef struct stbtt_pack_context stbtt_pack_context; -typedef struct stbtt_fontinfo stbtt_fontinfo; -#ifndef STB_RECT_PACK_VERSION -typedef struct stbrp_rect stbrp_rect; -#endif - -STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int width, int height, int stride_in_bytes, int padding, void *alloc_context); -// Initializes a packing context stored in the passed-in stbtt_pack_context. -// Future calls using this context will pack characters into the bitmap passed -// in here: a 1-channel bitmap that is width * height. stride_in_bytes is -// the distance from one row to the next (or 0 to mean they are packed tightly -// together). "padding" is the amount of padding to leave between each -// character (normally you want '1' for bitmaps you'll use as textures with -// bilinear filtering). -// -// Returns 0 on failure, 1 on success. - -STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc); -// Cleans up the packing context and frees all memory. - -#define STBTT_POINT_SIZE(x) (-(x)) - -STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size, - int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range); -// Creates character bitmaps from the font_index'th font found in fontdata (use -// font_index=0 if you don't know what that is). It creates num_chars_in_range -// bitmaps for characters with unicode values starting at first_unicode_char_in_range -// and increasing. Data for how to render them is stored in chardata_for_range; -// pass these to stbtt_GetPackedQuad to get back renderable quads. -// -// font_size is the full height of the character from ascender to descender, -// as computed by stbtt_ScaleForPixelHeight. To use a point size as computed -// by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE() -// and pass that result as 'font_size': -// ..., 20 , ... // font max minus min y is 20 pixels tall -// ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall - -typedef struct -{ - float font_size; - int first_unicode_codepoint_in_range; // if non-zero, then the chars are continuous, and this is the first codepoint - int *array_of_unicode_codepoints; // if non-zero, then this is an array of unicode codepoints - int num_chars; - stbtt_packedchar *chardata_for_range; // output - unsigned char h_oversample, v_oversample; // don't set these, they're used internally -} stbtt_pack_range; - -STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges); -// Creates character bitmaps from multiple ranges of characters stored in -// ranges. This will usually create a better-packed bitmap than multiple -// calls to stbtt_PackFontRange. Note that you can call this multiple -// times within a single PackBegin/PackEnd. - -STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample); -// Oversampling a font increases the quality by allowing higher-quality subpixel -// positioning, and is especially valuable at smaller text sizes. -// -// This function sets the amount of oversampling for all following calls to -// stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given -// pack context. The default (no oversampling) is achieved by h_oversample=1 -// and v_oversample=1. The total number of pixels required is -// h_oversample*v_oversample larger than the default; for example, 2x2 -// oversampling requires 4x the storage of 1x1. For best results, render -// oversampled textures with bilinear filtering. Look at the readme in -// stb/tests/oversample for information about oversampled fonts -// -// To use with PackFontRangesGather etc., you must set it before calls -// call to PackFontRangesGatherRects. - -STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip); -// If skip != 0, this tells stb_truetype to skip any codepoints for which -// there is no corresponding glyph. If skip=0, which is the default, then -// codepoints without a glyph recived the font's "missing character" glyph, -// typically an empty box by convention. - -STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, // same data as above - int char_index, // character to display - float *xpos, float *ypos, // pointers to current position in screen pixel space - stbtt_aligned_quad *q, // output: quad to draw - int align_to_integer); - -STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects); -STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects); -STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects); -// Calling these functions in sequence is roughly equivalent to calling -// stbtt_PackFontRanges(). If you more control over the packing of multiple -// fonts, or if you want to pack custom data into a font texture, take a look -// at the source to of stbtt_PackFontRanges() and create a custom version -// using these functions, e.g. call GatherRects multiple times, -// building up a single array of rects, then call PackRects once, -// then call RenderIntoRects repeatedly. This may result in a -// better packing than calling PackFontRanges multiple times -// (or it may not). - -// this is an opaque structure that you shouldn't mess with which holds -// all the context needed from PackBegin to PackEnd. -struct stbtt_pack_context { - void *user_allocator_context; - void *pack_info; - int width; - int height; - int stride_in_bytes; - int padding; - int skip_missing; - unsigned int h_oversample, v_oversample; - unsigned char *pixels; - void *nodes; -}; - -////////////////////////////////////////////////////////////////////////////// -// -// FONT LOADING -// -// - -STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data); -// This function will determine the number of fonts in a font file. TrueType -// collection (.ttc) files may contain multiple fonts, while TrueType font -// (.ttf) files only contain one font. The number of fonts can be used for -// indexing with the previous function where the index is between zero and one -// less than the total fonts. If an error occurs, -1 is returned. - -STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index); -// Each .ttf/.ttc file may have more than one font. Each font has a sequential -// index number starting from 0. Call this function to get the font offset for -// a given index; it returns -1 if the index is out of range. A regular .ttf -// file will only define one font and it always be at offset 0, so it will -// return '0' for index 0, and -1 for all other indices. - -// The following structure is defined publicly so you can declare one on -// the stack or as a global or etc, but you should treat it as opaque. -struct stbtt_fontinfo -{ - void * userdata; - unsigned char * data; // pointer to .ttf file - int fontstart; // offset of start of font - - int numGlyphs; // number of glyphs, needed for range checking - - int loca,head,glyf,hhea,hmtx,kern,gpos,svg; // table locations as offset from start of .ttf - int index_map; // a cmap mapping for our chosen character encoding - int indexToLocFormat; // format needed to map from glyph index to glyph - - stbtt__buf cff; // cff font data - stbtt__buf charstrings; // the charstring index - stbtt__buf gsubrs; // global charstring subroutines index - stbtt__buf subrs; // private charstring subroutines index - stbtt__buf fontdicts; // array of font dicts - stbtt__buf fdselect; // map from glyph to fontdict -}; - -STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset); -// Given an offset into the file that defines a font, this function builds -// the necessary cached info for the rest of the system. You must allocate -// the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't -// need to do anything special to free it, because the contents are pure -// value data with no additional data structures. Returns 0 on failure. - - -////////////////////////////////////////////////////////////////////////////// -// -// CHARACTER TO GLYPH-INDEX CONVERSIOn - -STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint); -// If you're going to perform multiple operations on the same character -// and you want a speed-up, call this function with the character you're -// going to process, then use glyph-based functions instead of the -// codepoint-based functions. -// Returns 0 if the character codepoint is not defined in the font. - - -////////////////////////////////////////////////////////////////////////////// -// -// CHARACTER PROPERTIES -// - -STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels); -// computes a scale factor to produce a font whose "height" is 'pixels' tall. -// Height is measured as the distance from the highest ascender to the lowest -// descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics -// and computing: -// scale = pixels / (ascent - descent) -// so if you prefer to measure height by the ascent only, use a similar calculation. - -STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels); -// computes a scale factor to produce a font whose EM size is mapped to -// 'pixels' tall. This is probably what traditional APIs compute, but -// I'm not positive. - -STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap); -// ascent is the coordinate above the baseline the font extends; descent -// is the coordinate below the baseline the font extends (i.e. it is typically negative) -// lineGap is the spacing between one row's descent and the next row's ascent... -// so you should advance the vertical position by "*ascent - *descent + *lineGap" -// these are expressed in unscaled coordinates, so you must multiply by -// the scale factor for a given size - -STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap); -// analogous to GetFontVMetrics, but returns the "typographic" values from the OS/2 -// table (specific to MS/Windows TTF files). -// -// Returns 1 on success (table present), 0 on failure. - -STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1); -// the bounding box around all possible characters - -STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing); -// leftSideBearing is the offset from the current horizontal position to the left edge of the character -// advanceWidth is the offset from the current horizontal position to the next horizontal position -// these are expressed in unscaled coordinates - -STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2); -// an additional amount to add to the 'advance' value between ch1 and ch2 - -STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1); -// Gets the bounding box of the visible part of the glyph, in unscaled coordinates - -STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing); -STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2); -STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1); -// as above, but takes one or more glyph indices for greater efficiency - -typedef struct stbtt_kerningentry -{ - int glyph1; // use stbtt_FindGlyphIndex - int glyph2; - int advance; -} stbtt_kerningentry; - -STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info); -STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length); -// Retrieves a complete list of all of the kerning pairs provided by the font -// stbtt_GetKerningTable never writes more than table_length entries and returns how many entries it did write. -// The table will be sorted by (a.glyph1 == b.glyph1)?(a.glyph2 < b.glyph2):(a.glyph1 < b.glyph1) - -////////////////////////////////////////////////////////////////////////////// -// -// GLYPH SHAPES (you probably don't need these, but they have to go before -// the bitmaps for C declaration-order reasons) -// - -#ifndef STBTT_vmove // you can predefine these to use different values (but why?) - enum { - STBTT_vmove=1, - STBTT_vline, - STBTT_vcurve, - STBTT_vcubic - }; -#endif - -#ifndef stbtt_vertex // you can predefine this to use different values - // (we share this with other code at RAD) - #define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file - typedef struct - { - stbtt_vertex_type x,y,cx,cy,cx1,cy1; - unsigned char type,padding; - } stbtt_vertex; -#endif - -STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index); -// returns non-zero if nothing is drawn for this glyph - -STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices); -STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices); -// returns # of vertices and fills *vertices with the pointer to them -// these are expressed in "unscaled" coordinates -// -// The shape is a series of contours. Each one starts with -// a STBTT_moveto, then consists of a series of mixed -// STBTT_lineto and STBTT_curveto segments. A lineto -// draws a line from previous endpoint to its x,y; a curveto -// draws a quadratic bezier from previous endpoint to -// its x,y, using cx,cy as the bezier control point. - -STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices); -// frees the data allocated above - -STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg); -STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg); -// fills svg with the character's SVG data. -// returns data size or 0 if SVG not found. - -////////////////////////////////////////////////////////////////////////////// -// -// BITMAP RENDERING -// - -STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata); -// frees the bitmap allocated below - -STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff); -// allocates a large-enough single-channel 8bpp bitmap and renders the -// specified character/glyph at the specified scale into it, with -// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque). -// *width & *height are filled out with the width & height of the bitmap, -// which is stored left-to-right, top-to-bottom. -// -// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap - -STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff); -// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel -// shift for the character - -STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint); -// the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap -// in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap -// is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the -// width and height and positioning info for it first. - -STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint); -// same as stbtt_MakeCodepointBitmap, but you can specify a subpixel -// shift for the character - -STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint); -// same as stbtt_MakeCodepointBitmapSubpixel, but prefiltering -// is performed (see stbtt_PackSetOversampling) - -STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1); -// get the bbox of the bitmap centered around the glyph origin; so the -// bitmap width is ix1-ix0, height is iy1-iy0, and location to place -// the bitmap top left is (leftSideBearing*scale,iy0). -// (Note that the bitmap uses y-increases-down, but the shape uses -// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.) - -STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1); -// same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel -// shift for the character - -// the following functions are equivalent to the above functions, but operate -// on glyph indices instead of Unicode codepoints (for efficiency) -STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff); -STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff); -STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph); -STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph); -STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int glyph); -STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1); -STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1); - - -// @TODO: don't expose this structure -typedef struct -{ - int w,h,stride; - unsigned char *pixels; -} stbtt__bitmap; - -// rasterize a shape with quadratic beziers into a bitmap -STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, // 1-channel bitmap to draw into - float flatness_in_pixels, // allowable error of curve in pixels - stbtt_vertex *vertices, // array of vertices defining shape - int num_verts, // number of vertices in above array - float scale_x, float scale_y, // scale applied to input vertices - float shift_x, float shift_y, // translation applied to input vertices - int x_off, int y_off, // another translation applied to input - int invert, // if non-zero, vertically flip shape - void *userdata); // context for to STBTT_MALLOC - -////////////////////////////////////////////////////////////////////////////// -// -// Signed Distance Function (or Field) rendering - -STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata); -// frees the SDF bitmap allocated below - -STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff); -STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff); -// These functions compute a discretized SDF field for a single character, suitable for storing -// in a single-channel texture, sampling with bilinear filtering, and testing against -// larger than some threshold to produce scalable fonts. -// info -- the font -// scale -- controls the size of the resulting SDF bitmap, same as it would be creating a regular bitmap -// glyph/codepoint -- the character to generate the SDF for -// padding -- extra "pixels" around the character which are filled with the distance to the character (not 0), -// which allows effects like bit outlines -// onedge_value -- value 0-255 to test the SDF against to reconstruct the character (i.e. the isocontour of the character) -// pixel_dist_scale -- what value the SDF should increase by when moving one SDF "pixel" away from the edge (on the 0..255 scale) -// if positive, > onedge_value is inside; if negative, < onedge_value is inside -// width,height -- output height & width of the SDF bitmap (including padding) -// xoff,yoff -- output origin of the character -// return value -- a 2D array of bytes 0..255, width*height in size -// -// pixel_dist_scale & onedge_value are a scale & bias that allows you to make -// optimal use of the limited 0..255 for your application, trading off precision -// and special effects. SDF values outside the range 0..255 are clamped to 0..255. -// -// Example: -// scale = stbtt_ScaleForPixelHeight(22) -// padding = 5 -// onedge_value = 180 -// pixel_dist_scale = 180/5.0 = 36.0 -// -// This will create an SDF bitmap in which the character is about 22 pixels -// high but the whole bitmap is about 22+5+5=32 pixels high. To produce a filled -// shape, sample the SDF at each pixel and fill the pixel if the SDF value -// is greater than or equal to 180/255. (You'll actually want to antialias, -// which is beyond the scope of this example.) Additionally, you can compute -// offset outlines (e.g. to stroke the character border inside & outside, -// or only outside). For example, to fill outside the character up to 3 SDF -// pixels, you would compare against (180-36.0*3)/255 = 72/255. The above -// choice of variables maps a range from 5 pixels outside the shape to -// 2 pixels inside the shape to 0..255; this is intended primarily for apply -// outside effects only (the interior range is needed to allow proper -// antialiasing of the font at *smaller* sizes) -// -// The function computes the SDF analytically at each SDF pixel, not by e.g. -// building a higher-res bitmap and approximating it. In theory the quality -// should be as high as possible for an SDF of this size & representation, but -// unclear if this is true in practice (perhaps building a higher-res bitmap -// and computing from that can allow drop-out prevention). -// -// The algorithm has not been optimized at all, so expect it to be slow -// if computing lots of characters or very large sizes. - - - -////////////////////////////////////////////////////////////////////////////// -// -// Finding the right font... -// -// You should really just solve this offline, keep your own tables -// of what font is what, and don't try to get it out of the .ttf file. -// That's because getting it out of the .ttf file is really hard, because -// the names in the file can appear in many possible encodings, in many -// possible languages, and e.g. if you need a case-insensitive comparison, -// the details of that depend on the encoding & language in a complex way -// (actually underspecified in truetype, but also gigantic). -// -// But you can use the provided functions in two possible ways: -// stbtt_FindMatchingFont() will use *case-sensitive* comparisons on -// unicode-encoded names to try to find the font you want; -// you can run this before calling stbtt_InitFont() -// -// stbtt_GetFontNameString() lets you get any of the various strings -// from the file yourself and do your own comparisons on them. -// You have to have called stbtt_InitFont() first. - - -STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags); -// returns the offset (not index) of the font that matches, or -1 if none -// if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold". -// if you use any other flag, use a font name like "Arial"; this checks -// the 'macStyle' header field; i don't know if fonts set this consistently -#define STBTT_MACSTYLE_DONTCARE 0 -#define STBTT_MACSTYLE_BOLD 1 -#define STBTT_MACSTYLE_ITALIC 2 -#define STBTT_MACSTYLE_UNDERSCORE 4 -#define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us check the bitfield is 0 - -STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2); -// returns 1/0 whether the first string interpreted as utf8 is identical to -// the second string interpreted as big-endian utf16... useful for strings from next func - -STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID); -// returns the string (which may be big-endian double byte, e.g. for unicode) -// and puts the length in bytes in *length. -// -// some of the values for the IDs are below; for more see the truetype spec: -// http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html -// http://www.microsoft.com/typography/otspec/name.htm - -enum { // platformID - STBTT_PLATFORM_ID_UNICODE =0, - STBTT_PLATFORM_ID_MAC =1, - STBTT_PLATFORM_ID_ISO =2, - STBTT_PLATFORM_ID_MICROSOFT =3 -}; - -enum { // encodingID for STBTT_PLATFORM_ID_UNICODE - STBTT_UNICODE_EID_UNICODE_1_0 =0, - STBTT_UNICODE_EID_UNICODE_1_1 =1, - STBTT_UNICODE_EID_ISO_10646 =2, - STBTT_UNICODE_EID_UNICODE_2_0_BMP=3, - STBTT_UNICODE_EID_UNICODE_2_0_FULL=4 -}; - -enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT - STBTT_MS_EID_SYMBOL =0, - STBTT_MS_EID_UNICODE_BMP =1, - STBTT_MS_EID_SHIFTJIS =2, - STBTT_MS_EID_UNICODE_FULL =10 -}; - -enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes - STBTT_MAC_EID_ROMAN =0, STBTT_MAC_EID_ARABIC =4, - STBTT_MAC_EID_JAPANESE =1, STBTT_MAC_EID_HEBREW =5, - STBTT_MAC_EID_CHINESE_TRAD =2, STBTT_MAC_EID_GREEK =6, - STBTT_MAC_EID_KOREAN =3, STBTT_MAC_EID_RUSSIAN =7 -}; - -enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID... - // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs - STBTT_MS_LANG_ENGLISH =0x0409, STBTT_MS_LANG_ITALIAN =0x0410, - STBTT_MS_LANG_CHINESE =0x0804, STBTT_MS_LANG_JAPANESE =0x0411, - STBTT_MS_LANG_DUTCH =0x0413, STBTT_MS_LANG_KOREAN =0x0412, - STBTT_MS_LANG_FRENCH =0x040c, STBTT_MS_LANG_RUSSIAN =0x0419, - STBTT_MS_LANG_GERMAN =0x0407, STBTT_MS_LANG_SPANISH =0x0409, - STBTT_MS_LANG_HEBREW =0x040d, STBTT_MS_LANG_SWEDISH =0x041D -}; - -enum { // languageID for STBTT_PLATFORM_ID_MAC - STBTT_MAC_LANG_ENGLISH =0 , STBTT_MAC_LANG_JAPANESE =11, - STBTT_MAC_LANG_ARABIC =12, STBTT_MAC_LANG_KOREAN =23, - STBTT_MAC_LANG_DUTCH =4 , STBTT_MAC_LANG_RUSSIAN =32, - STBTT_MAC_LANG_FRENCH =1 , STBTT_MAC_LANG_SPANISH =6 , - STBTT_MAC_LANG_GERMAN =2 , STBTT_MAC_LANG_SWEDISH =5 , - STBTT_MAC_LANG_HEBREW =10, STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33, - STBTT_MAC_LANG_ITALIAN =3 , STBTT_MAC_LANG_CHINESE_TRAD =19 -}; - -#ifdef __cplusplus -} -#endif - -#endif // __STB_INCLUDE_STB_TRUETYPE_H__ - -/////////////////////////////////////////////////////////////////////////////// -/////////////////////////////////////////////////////////////////////////////// -//// -//// IMPLEMENTATION -//// -//// - -#ifdef STB_TRUETYPE_IMPLEMENTATION - -#ifndef STBTT_MAX_OVERSAMPLE -#define STBTT_MAX_OVERSAMPLE 8 -#endif - -#if STBTT_MAX_OVERSAMPLE > 255 -#error "STBTT_MAX_OVERSAMPLE cannot be > 255" -#endif - -typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1]; - -#ifndef STBTT_RASTERIZER_VERSION -#define STBTT_RASTERIZER_VERSION 2 -#endif - -#ifdef _MSC_VER -#define STBTT__NOTUSED(v) (void)(v) -#else -#define STBTT__NOTUSED(v) (void)sizeof(v) -#endif - -////////////////////////////////////////////////////////////////////////// -// -// stbtt__buf helpers to parse data from file -// - -static stbtt_uint8 stbtt__buf_get8(stbtt__buf *b) -{ - if (b->cursor >= b->size) - return 0; - return b->data[b->cursor++]; -} - -static stbtt_uint8 stbtt__buf_peek8(stbtt__buf *b) -{ - if (b->cursor >= b->size) - return 0; - return b->data[b->cursor]; -} - -static void stbtt__buf_seek(stbtt__buf *b, int o) -{ - STBTT_assert(!(o > b->size || o < 0)); - b->cursor = (o > b->size || o < 0) ? b->size : o; -} - -static void stbtt__buf_skip(stbtt__buf *b, int o) -{ - stbtt__buf_seek(b, b->cursor + o); -} - -static stbtt_uint32 stbtt__buf_get(stbtt__buf *b, int n) -{ - stbtt_uint32 v = 0; - int i; - STBTT_assert(n >= 1 && n <= 4); - for (i = 0; i < n; i++) - v = (v << 8) | stbtt__buf_get8(b); - return v; -} - -static stbtt__buf stbtt__new_buf(const void *p, size_t size) -{ - stbtt__buf r; - STBTT_assert(size < 0x40000000); - r.data = (stbtt_uint8*) p; - r.size = (int) size; - r.cursor = 0; - return r; -} - -#define stbtt__buf_get16(b) stbtt__buf_get((b), 2) -#define stbtt__buf_get32(b) stbtt__buf_get((b), 4) - -static stbtt__buf stbtt__buf_range(const stbtt__buf *b, int o, int s) -{ - stbtt__buf r = stbtt__new_buf(NULL, 0); - if (o < 0 || s < 0 || o > b->size || s > b->size - o) return r; - r.data = b->data + o; - r.size = s; - return r; -} - -static stbtt__buf stbtt__cff_get_index(stbtt__buf *b) -{ - int count, start, offsize; - start = b->cursor; - count = stbtt__buf_get16(b); - if (count) { - offsize = stbtt__buf_get8(b); - STBTT_assert(offsize >= 1 && offsize <= 4); - stbtt__buf_skip(b, offsize * count); - stbtt__buf_skip(b, stbtt__buf_get(b, offsize) - 1); - } - return stbtt__buf_range(b, start, b->cursor - start); -} - -static stbtt_uint32 stbtt__cff_int(stbtt__buf *b) -{ - int b0 = stbtt__buf_get8(b); - if (b0 >= 32 && b0 <= 246) return b0 - 139; - else if (b0 >= 247 && b0 <= 250) return (b0 - 247)*256 + stbtt__buf_get8(b) + 108; - else if (b0 >= 251 && b0 <= 254) return -(b0 - 251)*256 - stbtt__buf_get8(b) - 108; - else if (b0 == 28) return stbtt__buf_get16(b); - else if (b0 == 29) return stbtt__buf_get32(b); - STBTT_assert(0); - return 0; -} - -static void stbtt__cff_skip_operand(stbtt__buf *b) { - int v, b0 = stbtt__buf_peek8(b); - STBTT_assert(b0 >= 28); - if (b0 == 30) { - stbtt__buf_skip(b, 1); - while (b->cursor < b->size) { - v = stbtt__buf_get8(b); - if ((v & 0xF) == 0xF || (v >> 4) == 0xF) - break; - } - } else { - stbtt__cff_int(b); - } -} - -static stbtt__buf stbtt__dict_get(stbtt__buf *b, int key) -{ - stbtt__buf_seek(b, 0); - while (b->cursor < b->size) { - int start = b->cursor, end, op; - while (stbtt__buf_peek8(b) >= 28) - stbtt__cff_skip_operand(b); - end = b->cursor; - op = stbtt__buf_get8(b); - if (op == 12) op = stbtt__buf_get8(b) | 0x100; - if (op == key) return stbtt__buf_range(b, start, end-start); - } - return stbtt__buf_range(b, 0, 0); -} - -static void stbtt__dict_get_ints(stbtt__buf *b, int key, int outcount, stbtt_uint32 *out) -{ - int i; - stbtt__buf operands = stbtt__dict_get(b, key); - for (i = 0; i < outcount && operands.cursor < operands.size; i++) - out[i] = stbtt__cff_int(&operands); -} - -static int stbtt__cff_index_count(stbtt__buf *b) -{ - stbtt__buf_seek(b, 0); - return stbtt__buf_get16(b); -} - -static stbtt__buf stbtt__cff_index_get(stbtt__buf b, int i) -{ - int count, offsize, start, end; - stbtt__buf_seek(&b, 0); - count = stbtt__buf_get16(&b); - offsize = stbtt__buf_get8(&b); - STBTT_assert(i >= 0 && i < count); - STBTT_assert(offsize >= 1 && offsize <= 4); - stbtt__buf_skip(&b, i*offsize); - start = stbtt__buf_get(&b, offsize); - end = stbtt__buf_get(&b, offsize); - return stbtt__buf_range(&b, 2+(count+1)*offsize+start, end - start); -} - -////////////////////////////////////////////////////////////////////////// -// -// accessors to parse data from file -// - -// on platforms that don't allow misaligned reads, if we want to allow -// truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE - -#define ttBYTE(p) (* (stbtt_uint8 *) (p)) -#define ttCHAR(p) (* (stbtt_int8 *) (p)) -#define ttFixed(p) ttLONG(p) - -static stbtt_uint16 ttUSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; } -static stbtt_int16 ttSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; } -static stbtt_uint32 ttULONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; } -static stbtt_int32 ttLONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; } - -#define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3)) -#define stbtt_tag(p,str) stbtt_tag4(p,str[0],str[1],str[2],str[3]) - -static int stbtt__isfont(stbtt_uint8 *font) -{ - // check the version number - if (stbtt_tag4(font, '1',0,0,0)) return 1; // TrueType 1 - if (stbtt_tag(font, "typ1")) return 1; // TrueType with type 1 font -- we don't support this! - if (stbtt_tag(font, "OTTO")) return 1; // OpenType with CFF - if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0 - if (stbtt_tag(font, "true")) return 1; // Apple specification for TrueType fonts - return 0; -} - -// @OPTIMIZE: binary search -static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag) -{ - stbtt_int32 num_tables = ttUSHORT(data+fontstart+4); - stbtt_uint32 tabledir = fontstart + 12; - stbtt_int32 i; - for (i=0; i < num_tables; ++i) { - stbtt_uint32 loc = tabledir + 16*i; - if (stbtt_tag(data+loc+0, tag)) - return ttULONG(data+loc+8); - } - return 0; -} - -static int stbtt_GetFontOffsetForIndex_internal(unsigned char *font_collection, int index) -{ - // if it's just a font, there's only one valid index - if (stbtt__isfont(font_collection)) - return index == 0 ? 0 : -1; - - // check if it's a TTC - if (stbtt_tag(font_collection, "ttcf")) { - // version 1? - if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) { - stbtt_int32 n = ttLONG(font_collection+8); - if (index >= n) - return -1; - return ttULONG(font_collection+12+index*4); - } - } - return -1; -} - -static int stbtt_GetNumberOfFonts_internal(unsigned char *font_collection) -{ - // if it's just a font, there's only one valid font - if (stbtt__isfont(font_collection)) - return 1; - - // check if it's a TTC - if (stbtt_tag(font_collection, "ttcf")) { - // version 1? - if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) { - return ttLONG(font_collection+8); - } - } - return 0; -} - -static stbtt__buf stbtt__get_subrs(stbtt__buf cff, stbtt__buf fontdict) -{ - stbtt_uint32 subrsoff = 0, private_loc[2] = { 0, 0 }; - stbtt__buf pdict; - stbtt__dict_get_ints(&fontdict, 18, 2, private_loc); - if (!private_loc[1] || !private_loc[0]) return stbtt__new_buf(NULL, 0); - pdict = stbtt__buf_range(&cff, private_loc[1], private_loc[0]); - stbtt__dict_get_ints(&pdict, 19, 1, &subrsoff); - if (!subrsoff) return stbtt__new_buf(NULL, 0); - stbtt__buf_seek(&cff, private_loc[1]+subrsoff); - return stbtt__cff_get_index(&cff); -} - -// since most people won't use this, find this table the first time it's needed -static int stbtt__get_svg(stbtt_fontinfo *info) -{ - stbtt_uint32 t; - if (info->svg < 0) { - t = stbtt__find_table(info->data, info->fontstart, "SVG "); - if (t) { - stbtt_uint32 offset = ttULONG(info->data + t + 2); - info->svg = t + offset; - } else { - info->svg = 0; - } - } - return info->svg; -} - -static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart) -{ - stbtt_uint32 cmap, t; - stbtt_int32 i,numTables; - - info->data = data; - info->fontstart = fontstart; - info->cff = stbtt__new_buf(NULL, 0); - - cmap = stbtt__find_table(data, fontstart, "cmap"); // required - info->loca = stbtt__find_table(data, fontstart, "loca"); // required - info->head = stbtt__find_table(data, fontstart, "head"); // required - info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required - info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required - info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required - info->kern = stbtt__find_table(data, fontstart, "kern"); // not required - info->gpos = stbtt__find_table(data, fontstart, "GPOS"); // not required - - if (!cmap || !info->head || !info->hhea || !info->hmtx) - return 0; - if (info->glyf) { - // required for truetype - if (!info->loca) return 0; - } else { - // initialization for CFF / Type2 fonts (OTF) - stbtt__buf b, topdict, topdictidx; - stbtt_uint32 cstype = 2, charstrings = 0, fdarrayoff = 0, fdselectoff = 0; - stbtt_uint32 cff; - - cff = stbtt__find_table(data, fontstart, "CFF "); - if (!cff) return 0; - - info->fontdicts = stbtt__new_buf(NULL, 0); - info->fdselect = stbtt__new_buf(NULL, 0); - - // @TODO this should use size from table (not 512MB) - info->cff = stbtt__new_buf(data+cff, 512*1024*1024); - b = info->cff; - - // read the header - stbtt__buf_skip(&b, 2); - stbtt__buf_seek(&b, stbtt__buf_get8(&b)); // hdrsize - - // @TODO the name INDEX could list multiple fonts, - // but we just use the first one. - stbtt__cff_get_index(&b); // name INDEX - topdictidx = stbtt__cff_get_index(&b); - topdict = stbtt__cff_index_get(topdictidx, 0); - stbtt__cff_get_index(&b); // string INDEX - info->gsubrs = stbtt__cff_get_index(&b); - - stbtt__dict_get_ints(&topdict, 17, 1, &charstrings); - stbtt__dict_get_ints(&topdict, 0x100 | 6, 1, &cstype); - stbtt__dict_get_ints(&topdict, 0x100 | 36, 1, &fdarrayoff); - stbtt__dict_get_ints(&topdict, 0x100 | 37, 1, &fdselectoff); - info->subrs = stbtt__get_subrs(b, topdict); - - // we only support Type 2 charstrings - if (cstype != 2) return 0; - if (charstrings == 0) return 0; - - if (fdarrayoff) { - // looks like a CID font - if (!fdselectoff) return 0; - stbtt__buf_seek(&b, fdarrayoff); - info->fontdicts = stbtt__cff_get_index(&b); - info->fdselect = stbtt__buf_range(&b, fdselectoff, b.size-fdselectoff); - } - - stbtt__buf_seek(&b, charstrings); - info->charstrings = stbtt__cff_get_index(&b); - } - - t = stbtt__find_table(data, fontstart, "maxp"); - if (t) - info->numGlyphs = ttUSHORT(data+t+4); - else - info->numGlyphs = 0xffff; - - info->svg = -1; - - // find a cmap encoding table we understand *now* to avoid searching - // later. (todo: could make this installable) - // the same regardless of glyph. - numTables = ttUSHORT(data + cmap + 2); - info->index_map = 0; - for (i=0; i < numTables; ++i) { - stbtt_uint32 encoding_record = cmap + 4 + 8 * i; - // find an encoding we understand: - switch(ttUSHORT(data+encoding_record)) { - case STBTT_PLATFORM_ID_MICROSOFT: - switch (ttUSHORT(data+encoding_record+2)) { - case STBTT_MS_EID_UNICODE_BMP: - case STBTT_MS_EID_UNICODE_FULL: - // MS/Unicode - info->index_map = cmap + ttULONG(data+encoding_record+4); - break; - } - break; - case STBTT_PLATFORM_ID_UNICODE: - // Mac/iOS has these - // all the encodingIDs are unicode, so we don't bother to check it - info->index_map = cmap + ttULONG(data+encoding_record+4); - break; - } - } - if (info->index_map == 0) - return 0; - - info->indexToLocFormat = ttUSHORT(data+info->head + 50); - return 1; -} - -STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint) -{ - stbtt_uint8 *data = info->data; - stbtt_uint32 index_map = info->index_map; - - stbtt_uint16 format = ttUSHORT(data + index_map + 0); - if (format == 0) { // apple byte encoding - stbtt_int32 bytes = ttUSHORT(data + index_map + 2); - if (unicode_codepoint < bytes-6) - return ttBYTE(data + index_map + 6 + unicode_codepoint); - return 0; - } else if (format == 6) { - stbtt_uint32 first = ttUSHORT(data + index_map + 6); - stbtt_uint32 count = ttUSHORT(data + index_map + 8); - if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count) - return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2); - return 0; - } else if (format == 2) { - STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean - return 0; - } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges - stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1; - stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1; - stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10); - stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1; - - // do a binary search of the segments - stbtt_uint32 endCount = index_map + 14; - stbtt_uint32 search = endCount; - - if (unicode_codepoint > 0xffff) - return 0; - - // they lie from endCount .. endCount + segCount - // but searchRange is the nearest power of two, so... - if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2)) - search += rangeShift*2; - - // now decrement to bias correctly to find smallest - search -= 2; - while (entrySelector) { - stbtt_uint16 end; - searchRange >>= 1; - end = ttUSHORT(data + search + searchRange*2); - if (unicode_codepoint > end) - search += searchRange*2; - --entrySelector; - } - search += 2; - - { - stbtt_uint16 offset, start; - stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1); - - STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item)); - start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item); - if (unicode_codepoint < start) - return 0; - - offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item); - if (offset == 0) - return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item)); - - return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item); - } - } else if (format == 12 || format == 13) { - stbtt_uint32 ngroups = ttULONG(data+index_map+12); - stbtt_int32 low,high; - low = 0; high = (stbtt_int32)ngroups; - // Binary search the right group. - while (low < high) { - stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high - stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12); - stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4); - if ((stbtt_uint32) unicode_codepoint < start_char) - high = mid; - else if ((stbtt_uint32) unicode_codepoint > end_char) - low = mid+1; - else { - stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8); - if (format == 12) - return start_glyph + unicode_codepoint-start_char; - else // format == 13 - return start_glyph; - } - } - return 0; // not found - } - // @TODO - STBTT_assert(0); - return 0; -} - -STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices) -{ - return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices); -} - -static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy) -{ - v->type = type; - v->x = (stbtt_int16) x; - v->y = (stbtt_int16) y; - v->cx = (stbtt_int16) cx; - v->cy = (stbtt_int16) cy; -} - -static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index) -{ - int g1,g2; - - STBTT_assert(!info->cff.size); - - if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range - if (info->indexToLocFormat >= 2) return -1; // unknown index->glyph map format - - if (info->indexToLocFormat == 0) { - g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2; - g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2; - } else { - g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4); - g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4); - } - - return g1==g2 ? -1 : g1; // if length is 0, return -1 -} - -static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1); - -STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1) -{ - if (info->cff.size) { - stbtt__GetGlyphInfoT2(info, glyph_index, x0, y0, x1, y1); - } else { - int g = stbtt__GetGlyfOffset(info, glyph_index); - if (g < 0) return 0; - - if (x0) *x0 = ttSHORT(info->data + g + 2); - if (y0) *y0 = ttSHORT(info->data + g + 4); - if (x1) *x1 = ttSHORT(info->data + g + 6); - if (y1) *y1 = ttSHORT(info->data + g + 8); - } - return 1; -} - -STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1) -{ - return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1); -} - -STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index) -{ - stbtt_int16 numberOfContours; - int g; - if (info->cff.size) - return stbtt__GetGlyphInfoT2(info, glyph_index, NULL, NULL, NULL, NULL) == 0; - g = stbtt__GetGlyfOffset(info, glyph_index); - if (g < 0) return 1; - numberOfContours = ttSHORT(info->data + g); - return numberOfContours == 0; -} - -static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off, - stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy) -{ - if (start_off) { - if (was_off) - stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy); - stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy); - } else { - if (was_off) - stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy); - else - stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0); - } - return num_vertices; -} - -static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) -{ - stbtt_int16 numberOfContours; - stbtt_uint8 *endPtsOfContours; - stbtt_uint8 *data = info->data; - stbtt_vertex *vertices=0; - int num_vertices=0; - int g = stbtt__GetGlyfOffset(info, glyph_index); - - *pvertices = NULL; - - if (g < 0) return 0; - - numberOfContours = ttSHORT(data + g); - - if (numberOfContours > 0) { - stbtt_uint8 flags=0,flagcount; - stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0; - stbtt_int32 x,y,cx,cy,sx,sy, scx,scy; - stbtt_uint8 *points; - endPtsOfContours = (data + g + 10); - ins = ttUSHORT(data + g + 10 + numberOfContours * 2); - points = data + g + 10 + numberOfContours * 2 + 2 + ins; - - n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2); - - m = n + 2*numberOfContours; // a loose bound on how many vertices we might need - vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata); - if (vertices == 0) - return 0; - - next_move = 0; - flagcount=0; - - // in first pass, we load uninterpreted data into the allocated array - // above, shifted to the end of the array so we won't overwrite it when - // we create our final data starting from the front - - off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated - - // first load flags - - for (i=0; i < n; ++i) { - if (flagcount == 0) { - flags = *points++; - if (flags & 8) - flagcount = *points++; - } else - --flagcount; - vertices[off+i].type = flags; - } - - // now load x coordinates - x=0; - for (i=0; i < n; ++i) { - flags = vertices[off+i].type; - if (flags & 2) { - stbtt_int16 dx = *points++; - x += (flags & 16) ? dx : -dx; // ??? - } else { - if (!(flags & 16)) { - x = x + (stbtt_int16) (points[0]*256 + points[1]); - points += 2; - } - } - vertices[off+i].x = (stbtt_int16) x; - } - - // now load y coordinates - y=0; - for (i=0; i < n; ++i) { - flags = vertices[off+i].type; - if (flags & 4) { - stbtt_int16 dy = *points++; - y += (flags & 32) ? dy : -dy; // ??? - } else { - if (!(flags & 32)) { - y = y + (stbtt_int16) (points[0]*256 + points[1]); - points += 2; - } - } - vertices[off+i].y = (stbtt_int16) y; - } - - // now convert them to our format - num_vertices=0; - sx = sy = cx = cy = scx = scy = 0; - for (i=0; i < n; ++i) { - flags = vertices[off+i].type; - x = (stbtt_int16) vertices[off+i].x; - y = (stbtt_int16) vertices[off+i].y; - - if (next_move == i) { - if (i != 0) - num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy); - - // now start the new one - start_off = !(flags & 1); - if (start_off) { - // if we start off with an off-curve point, then when we need to find a point on the curve - // where we can start, and we need to save some state for when we wraparound. - scx = x; - scy = y; - if (!(vertices[off+i+1].type & 1)) { - // next point is also a curve point, so interpolate an on-point curve - sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1; - sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1; - } else { - // otherwise just use the next point as our start point - sx = (stbtt_int32) vertices[off+i+1].x; - sy = (stbtt_int32) vertices[off+i+1].y; - ++i; // we're using point i+1 as the starting point, so skip it - } - } else { - sx = x; - sy = y; - } - stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0); - was_off = 0; - next_move = 1 + ttUSHORT(endPtsOfContours+j*2); - ++j; - } else { - if (!(flags & 1)) { // if it's a curve - if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint - stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy); - cx = x; - cy = y; - was_off = 1; - } else { - if (was_off) - stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy); - else - stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0); - was_off = 0; - } - } - } - num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy); - } else if (numberOfContours < 0) { - // Compound shapes. - int more = 1; - stbtt_uint8 *comp = data + g + 10; - num_vertices = 0; - vertices = 0; - while (more) { - stbtt_uint16 flags, gidx; - int comp_num_verts = 0, i; - stbtt_vertex *comp_verts = 0, *tmp = 0; - float mtx[6] = {1,0,0,1,0,0}, m, n; - - flags = ttSHORT(comp); comp+=2; - gidx = ttSHORT(comp); comp+=2; - - if (flags & 2) { // XY values - if (flags & 1) { // shorts - mtx[4] = ttSHORT(comp); comp+=2; - mtx[5] = ttSHORT(comp); comp+=2; - } else { - mtx[4] = ttCHAR(comp); comp+=1; - mtx[5] = ttCHAR(comp); comp+=1; - } - } - else { - // @TODO handle matching point - STBTT_assert(0); - } - if (flags & (1<<3)) { // WE_HAVE_A_SCALE - mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2; - mtx[1] = mtx[2] = 0; - } else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE - mtx[0] = ttSHORT(comp)/16384.0f; comp+=2; - mtx[1] = mtx[2] = 0; - mtx[3] = ttSHORT(comp)/16384.0f; comp+=2; - } else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO - mtx[0] = ttSHORT(comp)/16384.0f; comp+=2; - mtx[1] = ttSHORT(comp)/16384.0f; comp+=2; - mtx[2] = ttSHORT(comp)/16384.0f; comp+=2; - mtx[3] = ttSHORT(comp)/16384.0f; comp+=2; - } - - // Find transformation scales. - m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]); - n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]); - - // Get indexed glyph. - comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts); - if (comp_num_verts > 0) { - // Transform vertices. - for (i = 0; i < comp_num_verts; ++i) { - stbtt_vertex* v = &comp_verts[i]; - stbtt_vertex_type x,y; - x=v->x; y=v->y; - v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4])); - v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5])); - x=v->cx; y=v->cy; - v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4])); - v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5])); - } - // Append vertices. - tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata); - if (!tmp) { - if (vertices) STBTT_free(vertices, info->userdata); - if (comp_verts) STBTT_free(comp_verts, info->userdata); - return 0; - } - if (num_vertices > 0) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex)); - STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex)); - if (vertices) STBTT_free(vertices, info->userdata); - vertices = tmp; - STBTT_free(comp_verts, info->userdata); - num_vertices += comp_num_verts; - } - // More components ? - more = flags & (1<<5); - } - } else { - // numberOfCounters == 0, do nothing - } - - *pvertices = vertices; - return num_vertices; -} - -typedef struct -{ - int bounds; - int started; - float first_x, first_y; - float x, y; - stbtt_int32 min_x, max_x, min_y, max_y; - - stbtt_vertex *pvertices; - int num_vertices; -} stbtt__csctx; - -#define STBTT__CSCTX_INIT(bounds) {bounds,0, 0,0, 0,0, 0,0,0,0, NULL, 0} - -static void stbtt__track_vertex(stbtt__csctx *c, stbtt_int32 x, stbtt_int32 y) -{ - if (x > c->max_x || !c->started) c->max_x = x; - if (y > c->max_y || !c->started) c->max_y = y; - if (x < c->min_x || !c->started) c->min_x = x; - if (y < c->min_y || !c->started) c->min_y = y; - c->started = 1; -} - -static void stbtt__csctx_v(stbtt__csctx *c, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy, stbtt_int32 cx1, stbtt_int32 cy1) -{ - if (c->bounds) { - stbtt__track_vertex(c, x, y); - if (type == STBTT_vcubic) { - stbtt__track_vertex(c, cx, cy); - stbtt__track_vertex(c, cx1, cy1); - } - } else { - stbtt_setvertex(&c->pvertices[c->num_vertices], type, x, y, cx, cy); - c->pvertices[c->num_vertices].cx1 = (stbtt_int16) cx1; - c->pvertices[c->num_vertices].cy1 = (stbtt_int16) cy1; - } - c->num_vertices++; -} - -static void stbtt__csctx_close_shape(stbtt__csctx *ctx) -{ - if (ctx->first_x != ctx->x || ctx->first_y != ctx->y) - stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->first_x, (int)ctx->first_y, 0, 0, 0, 0); -} - -static void stbtt__csctx_rmove_to(stbtt__csctx *ctx, float dx, float dy) -{ - stbtt__csctx_close_shape(ctx); - ctx->first_x = ctx->x = ctx->x + dx; - ctx->first_y = ctx->y = ctx->y + dy; - stbtt__csctx_v(ctx, STBTT_vmove, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0); -} - -static void stbtt__csctx_rline_to(stbtt__csctx *ctx, float dx, float dy) -{ - ctx->x += dx; - ctx->y += dy; - stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0); -} - -static void stbtt__csctx_rccurve_to(stbtt__csctx *ctx, float dx1, float dy1, float dx2, float dy2, float dx3, float dy3) -{ - float cx1 = ctx->x + dx1; - float cy1 = ctx->y + dy1; - float cx2 = cx1 + dx2; - float cy2 = cy1 + dy2; - ctx->x = cx2 + dx3; - ctx->y = cy2 + dy3; - stbtt__csctx_v(ctx, STBTT_vcubic, (int)ctx->x, (int)ctx->y, (int)cx1, (int)cy1, (int)cx2, (int)cy2); -} - -static stbtt__buf stbtt__get_subr(stbtt__buf idx, int n) -{ - int count = stbtt__cff_index_count(&idx); - int bias = 107; - if (count >= 33900) - bias = 32768; - else if (count >= 1240) - bias = 1131; - n += bias; - if (n < 0 || n >= count) - return stbtt__new_buf(NULL, 0); - return stbtt__cff_index_get(idx, n); -} - -static stbtt__buf stbtt__cid_get_glyph_subrs(const stbtt_fontinfo *info, int glyph_index) -{ - stbtt__buf fdselect = info->fdselect; - int nranges, start, end, v, fmt, fdselector = -1, i; - - stbtt__buf_seek(&fdselect, 0); - fmt = stbtt__buf_get8(&fdselect); - if (fmt == 0) { - // untested - stbtt__buf_skip(&fdselect, glyph_index); - fdselector = stbtt__buf_get8(&fdselect); - } else if (fmt == 3) { - nranges = stbtt__buf_get16(&fdselect); - start = stbtt__buf_get16(&fdselect); - for (i = 0; i < nranges; i++) { - v = stbtt__buf_get8(&fdselect); - end = stbtt__buf_get16(&fdselect); - if (glyph_index >= start && glyph_index < end) { - fdselector = v; - break; - } - start = end; - } - } - if (fdselector == -1) stbtt__new_buf(NULL, 0); - return stbtt__get_subrs(info->cff, stbtt__cff_index_get(info->fontdicts, fdselector)); -} - -static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, stbtt__csctx *c) -{ - int in_header = 1, maskbits = 0, subr_stack_height = 0, sp = 0, v, i, b0; - int has_subrs = 0, clear_stack; - float s[48]; - stbtt__buf subr_stack[10], subrs = info->subrs, b; - float f; - -#define STBTT__CSERR(s) (0) - - // this currently ignores the initial width value, which isn't needed if we have hmtx - b = stbtt__cff_index_get(info->charstrings, glyph_index); - while (b.cursor < b.size) { - i = 0; - clear_stack = 1; - b0 = stbtt__buf_get8(&b); - switch (b0) { - // @TODO implement hinting - case 0x13: // hintmask - case 0x14: // cntrmask - if (in_header) - maskbits += (sp / 2); // implicit "vstem" - in_header = 0; - stbtt__buf_skip(&b, (maskbits + 7) / 8); - break; - - case 0x01: // hstem - case 0x03: // vstem - case 0x12: // hstemhm - case 0x17: // vstemhm - maskbits += (sp / 2); - break; - - case 0x15: // rmoveto - in_header = 0; - if (sp < 2) return STBTT__CSERR("rmoveto stack"); - stbtt__csctx_rmove_to(c, s[sp-2], s[sp-1]); - break; - case 0x04: // vmoveto - in_header = 0; - if (sp < 1) return STBTT__CSERR("vmoveto stack"); - stbtt__csctx_rmove_to(c, 0, s[sp-1]); - break; - case 0x16: // hmoveto - in_header = 0; - if (sp < 1) return STBTT__CSERR("hmoveto stack"); - stbtt__csctx_rmove_to(c, s[sp-1], 0); - break; - - case 0x05: // rlineto - if (sp < 2) return STBTT__CSERR("rlineto stack"); - for (; i + 1 < sp; i += 2) - stbtt__csctx_rline_to(c, s[i], s[i+1]); - break; - - // hlineto/vlineto and vhcurveto/hvcurveto alternate horizontal and vertical - // starting from a different place. - - case 0x07: // vlineto - if (sp < 1) return STBTT__CSERR("vlineto stack"); - goto vlineto; - case 0x06: // hlineto - if (sp < 1) return STBTT__CSERR("hlineto stack"); - for (;;) { - if (i >= sp) break; - stbtt__csctx_rline_to(c, s[i], 0); - i++; - vlineto: - if (i >= sp) break; - stbtt__csctx_rline_to(c, 0, s[i]); - i++; - } - break; - - case 0x1F: // hvcurveto - if (sp < 4) return STBTT__CSERR("hvcurveto stack"); - goto hvcurveto; - case 0x1E: // vhcurveto - if (sp < 4) return STBTT__CSERR("vhcurveto stack"); - for (;;) { - if (i + 3 >= sp) break; - stbtt__csctx_rccurve_to(c, 0, s[i], s[i+1], s[i+2], s[i+3], (sp - i == 5) ? s[i + 4] : 0.0f); - i += 4; - hvcurveto: - if (i + 3 >= sp) break; - stbtt__csctx_rccurve_to(c, s[i], 0, s[i+1], s[i+2], (sp - i == 5) ? s[i+4] : 0.0f, s[i+3]); - i += 4; - } - break; - - case 0x08: // rrcurveto - if (sp < 6) return STBTT__CSERR("rcurveline stack"); - for (; i + 5 < sp; i += 6) - stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]); - break; - - case 0x18: // rcurveline - if (sp < 8) return STBTT__CSERR("rcurveline stack"); - for (; i + 5 < sp - 2; i += 6) - stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]); - if (i + 1 >= sp) return STBTT__CSERR("rcurveline stack"); - stbtt__csctx_rline_to(c, s[i], s[i+1]); - break; - - case 0x19: // rlinecurve - if (sp < 8) return STBTT__CSERR("rlinecurve stack"); - for (; i + 1 < sp - 6; i += 2) - stbtt__csctx_rline_to(c, s[i], s[i+1]); - if (i + 5 >= sp) return STBTT__CSERR("rlinecurve stack"); - stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]); - break; - - case 0x1A: // vvcurveto - case 0x1B: // hhcurveto - if (sp < 4) return STBTT__CSERR("(vv|hh)curveto stack"); - f = 0.0; - if (sp & 1) { f = s[i]; i++; } - for (; i + 3 < sp; i += 4) { - if (b0 == 0x1B) - stbtt__csctx_rccurve_to(c, s[i], f, s[i+1], s[i+2], s[i+3], 0.0); - else - stbtt__csctx_rccurve_to(c, f, s[i], s[i+1], s[i+2], 0.0, s[i+3]); - f = 0.0; - } - break; - - case 0x0A: // callsubr - if (!has_subrs) { - if (info->fdselect.size) - subrs = stbtt__cid_get_glyph_subrs(info, glyph_index); - has_subrs = 1; - } - // fallthrough - case 0x1D: // callgsubr - if (sp < 1) return STBTT__CSERR("call(g|)subr stack"); - v = (int) s[--sp]; - if (subr_stack_height >= 10) return STBTT__CSERR("recursion limit"); - subr_stack[subr_stack_height++] = b; - b = stbtt__get_subr(b0 == 0x0A ? subrs : info->gsubrs, v); - if (b.size == 0) return STBTT__CSERR("subr not found"); - b.cursor = 0; - clear_stack = 0; - break; - - case 0x0B: // return - if (subr_stack_height <= 0) return STBTT__CSERR("return outside subr"); - b = subr_stack[--subr_stack_height]; - clear_stack = 0; - break; - - case 0x0E: // endchar - stbtt__csctx_close_shape(c); - return 1; - - case 0x0C: { // two-byte escape - float dx1, dx2, dx3, dx4, dx5, dx6, dy1, dy2, dy3, dy4, dy5, dy6; - float dx, dy; - int b1 = stbtt__buf_get8(&b); - switch (b1) { - // @TODO These "flex" implementations ignore the flex-depth and resolution, - // and always draw beziers. - case 0x22: // hflex - if (sp < 7) return STBTT__CSERR("hflex stack"); - dx1 = s[0]; - dx2 = s[1]; - dy2 = s[2]; - dx3 = s[3]; - dx4 = s[4]; - dx5 = s[5]; - dx6 = s[6]; - stbtt__csctx_rccurve_to(c, dx1, 0, dx2, dy2, dx3, 0); - stbtt__csctx_rccurve_to(c, dx4, 0, dx5, -dy2, dx6, 0); - break; - - case 0x23: // flex - if (sp < 13) return STBTT__CSERR("flex stack"); - dx1 = s[0]; - dy1 = s[1]; - dx2 = s[2]; - dy2 = s[3]; - dx3 = s[4]; - dy3 = s[5]; - dx4 = s[6]; - dy4 = s[7]; - dx5 = s[8]; - dy5 = s[9]; - dx6 = s[10]; - dy6 = s[11]; - //fd is s[12] - stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3); - stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6); - break; - - case 0x24: // hflex1 - if (sp < 9) return STBTT__CSERR("hflex1 stack"); - dx1 = s[0]; - dy1 = s[1]; - dx2 = s[2]; - dy2 = s[3]; - dx3 = s[4]; - dx4 = s[5]; - dx5 = s[6]; - dy5 = s[7]; - dx6 = s[8]; - stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, 0); - stbtt__csctx_rccurve_to(c, dx4, 0, dx5, dy5, dx6, -(dy1+dy2+dy5)); - break; - - case 0x25: // flex1 - if (sp < 11) return STBTT__CSERR("flex1 stack"); - dx1 = s[0]; - dy1 = s[1]; - dx2 = s[2]; - dy2 = s[3]; - dx3 = s[4]; - dy3 = s[5]; - dx4 = s[6]; - dy4 = s[7]; - dx5 = s[8]; - dy5 = s[9]; - dx6 = dy6 = s[10]; - dx = dx1+dx2+dx3+dx4+dx5; - dy = dy1+dy2+dy3+dy4+dy5; - if (STBTT_fabs(dx) > STBTT_fabs(dy)) - dy6 = -dy; - else - dx6 = -dx; - stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3); - stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6); - break; - - default: - return STBTT__CSERR("unimplemented"); - } - } break; - - default: - if (b0 != 255 && b0 != 28 && (b0 < 32 || b0 > 254)) - return STBTT__CSERR("reserved operator"); - - // push immediate - if (b0 == 255) { - f = (float)(stbtt_int32)stbtt__buf_get32(&b) / 0x10000; - } else { - stbtt__buf_skip(&b, -1); - f = (float)(stbtt_int16)stbtt__cff_int(&b); - } - if (sp >= 48) return STBTT__CSERR("push stack overflow"); - s[sp++] = f; - clear_stack = 0; - break; - } - if (clear_stack) sp = 0; - } - return STBTT__CSERR("no endchar"); - -#undef STBTT__CSERR -} - -static int stbtt__GetGlyphShapeT2(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) -{ - // runs the charstring twice, once to count and once to output (to avoid realloc) - stbtt__csctx count_ctx = STBTT__CSCTX_INIT(1); - stbtt__csctx output_ctx = STBTT__CSCTX_INIT(0); - if (stbtt__run_charstring(info, glyph_index, &count_ctx)) { - *pvertices = (stbtt_vertex*)STBTT_malloc(count_ctx.num_vertices*sizeof(stbtt_vertex), info->userdata); - output_ctx.pvertices = *pvertices; - if (stbtt__run_charstring(info, glyph_index, &output_ctx)) { - STBTT_assert(output_ctx.num_vertices == count_ctx.num_vertices); - return output_ctx.num_vertices; - } - } - *pvertices = NULL; - return 0; -} - -static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1) -{ - stbtt__csctx c = STBTT__CSCTX_INIT(1); - int r = stbtt__run_charstring(info, glyph_index, &c); - if (x0) *x0 = r ? c.min_x : 0; - if (y0) *y0 = r ? c.min_y : 0; - if (x1) *x1 = r ? c.max_x : 0; - if (y1) *y1 = r ? c.max_y : 0; - return r ? c.num_vertices : 0; -} - -STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) -{ - if (!info->cff.size) - return stbtt__GetGlyphShapeTT(info, glyph_index, pvertices); - else - return stbtt__GetGlyphShapeT2(info, glyph_index, pvertices); -} - -STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing) -{ - stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34); - if (glyph_index < numOfLongHorMetrics) { - if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*glyph_index); - if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2); - } else { - if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1)); - if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics)); - } -} - -STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info) -{ - stbtt_uint8 *data = info->data + info->kern; - - // we only look at the first table. it must be 'horizontal' and format 0. - if (!info->kern) - return 0; - if (ttUSHORT(data+2) < 1) // number of tables, need at least 1 - return 0; - if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format - return 0; - - return ttUSHORT(data+10); -} - -STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length) -{ - stbtt_uint8 *data = info->data + info->kern; - int k, length; - - // we only look at the first table. it must be 'horizontal' and format 0. - if (!info->kern) - return 0; - if (ttUSHORT(data+2) < 1) // number of tables, need at least 1 - return 0; - if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format - return 0; - - length = ttUSHORT(data+10); - if (table_length < length) - length = table_length; - - for (k = 0; k < length; k++) - { - table[k].glyph1 = ttUSHORT(data+18+(k*6)); - table[k].glyph2 = ttUSHORT(data+20+(k*6)); - table[k].advance = ttSHORT(data+22+(k*6)); - } - - return length; -} - -static int stbtt__GetGlyphKernInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2) -{ - stbtt_uint8 *data = info->data + info->kern; - stbtt_uint32 needle, straw; - int l, r, m; - - // we only look at the first table. it must be 'horizontal' and format 0. - if (!info->kern) - return 0; - if (ttUSHORT(data+2) < 1) // number of tables, need at least 1 - return 0; - if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format - return 0; - - l = 0; - r = ttUSHORT(data+10) - 1; - needle = glyph1 << 16 | glyph2; - while (l <= r) { - m = (l + r) >> 1; - straw = ttULONG(data+18+(m*6)); // note: unaligned read - if (needle < straw) - r = m - 1; - else if (needle > straw) - l = m + 1; - else - return ttSHORT(data+22+(m*6)); - } - return 0; -} - -static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyph) -{ - stbtt_uint16 coverageFormat = ttUSHORT(coverageTable); - switch(coverageFormat) { - case 1: { - stbtt_uint16 glyphCount = ttUSHORT(coverageTable + 2); - - // Binary search. - stbtt_int32 l=0, r=glyphCount-1, m; - int straw, needle=glyph; - while (l <= r) { - stbtt_uint8 *glyphArray = coverageTable + 4; - stbtt_uint16 glyphID; - m = (l + r) >> 1; - glyphID = ttUSHORT(glyphArray + 2 * m); - straw = glyphID; - if (needle < straw) - r = m - 1; - else if (needle > straw) - l = m + 1; - else { - return m; - } - } - } break; - - case 2: { - stbtt_uint16 rangeCount = ttUSHORT(coverageTable + 2); - stbtt_uint8 *rangeArray = coverageTable + 4; - - // Binary search. - stbtt_int32 l=0, r=rangeCount-1, m; - int strawStart, strawEnd, needle=glyph; - while (l <= r) { - stbtt_uint8 *rangeRecord; - m = (l + r) >> 1; - rangeRecord = rangeArray + 6 * m; - strawStart = ttUSHORT(rangeRecord); - strawEnd = ttUSHORT(rangeRecord + 2); - if (needle < strawStart) - r = m - 1; - else if (needle > strawEnd) - l = m + 1; - else { - stbtt_uint16 startCoverageIndex = ttUSHORT(rangeRecord + 4); - return startCoverageIndex + glyph - strawStart; - } - } - } break; - - default: { - // There are no other cases. - STBTT_assert(0); - } break; - } - - return -1; -} - -static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph) -{ - stbtt_uint16 classDefFormat = ttUSHORT(classDefTable); - switch(classDefFormat) - { - case 1: { - stbtt_uint16 startGlyphID = ttUSHORT(classDefTable + 2); - stbtt_uint16 glyphCount = ttUSHORT(classDefTable + 4); - stbtt_uint8 *classDef1ValueArray = classDefTable + 6; - - if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount) - return (stbtt_int32)ttUSHORT(classDef1ValueArray + 2 * (glyph - startGlyphID)); - - classDefTable = classDef1ValueArray + 2 * glyphCount; - } break; - - case 2: { - stbtt_uint16 classRangeCount = ttUSHORT(classDefTable + 2); - stbtt_uint8 *classRangeRecords = classDefTable + 4; - - // Binary search. - stbtt_int32 l=0, r=classRangeCount-1, m; - int strawStart, strawEnd, needle=glyph; - while (l <= r) { - stbtt_uint8 *classRangeRecord; - m = (l + r) >> 1; - classRangeRecord = classRangeRecords + 6 * m; - strawStart = ttUSHORT(classRangeRecord); - strawEnd = ttUSHORT(classRangeRecord + 2); - if (needle < strawStart) - r = m - 1; - else if (needle > strawEnd) - l = m + 1; - else - return (stbtt_int32)ttUSHORT(classRangeRecord + 4); - } - - classDefTable = classRangeRecords + 6 * classRangeCount; - } break; - - default: { - // There are no other cases. - STBTT_assert(0); - } break; - } - - return -1; -} - -// Define to STBTT_assert(x) if you want to break on unimplemented formats. -#define STBTT_GPOS_TODO_assert(x) - -static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2) -{ - stbtt_uint16 lookupListOffset; - stbtt_uint8 *lookupList; - stbtt_uint16 lookupCount; - stbtt_uint8 *data; - stbtt_int32 i; - - if (!info->gpos) return 0; - - data = info->data + info->gpos; - - if (ttUSHORT(data+0) != 1) return 0; // Major version 1 - if (ttUSHORT(data+2) != 0) return 0; // Minor version 0 - - lookupListOffset = ttUSHORT(data+8); - lookupList = data + lookupListOffset; - lookupCount = ttUSHORT(lookupList); - - for (i=0; i> 1; - pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m; - secondGlyph = ttUSHORT(pairValue); - straw = secondGlyph; - if (needle < straw) - r = m - 1; - else if (needle > straw) - l = m + 1; - else { - stbtt_int16 xAdvance = ttSHORT(pairValue + 2); - return xAdvance; - } - } - } break; - - case 2: { - stbtt_uint16 valueFormat1 = ttUSHORT(table + 4); - stbtt_uint16 valueFormat2 = ttUSHORT(table + 6); - - stbtt_uint16 classDef1Offset = ttUSHORT(table + 8); - stbtt_uint16 classDef2Offset = ttUSHORT(table + 10); - int glyph1class = stbtt__GetGlyphClass(table + classDef1Offset, glyph1); - int glyph2class = stbtt__GetGlyphClass(table + classDef2Offset, glyph2); - - stbtt_uint16 class1Count = ttUSHORT(table + 12); - stbtt_uint16 class2Count = ttUSHORT(table + 14); - STBTT_assert(glyph1class < class1Count); - STBTT_assert(glyph2class < class2Count); - - // TODO: Support more formats. - STBTT_GPOS_TODO_assert(valueFormat1 == 4); - if (valueFormat1 != 4) return 0; - STBTT_GPOS_TODO_assert(valueFormat2 == 0); - if (valueFormat2 != 0) return 0; - - if (glyph1class >= 0 && glyph1class < class1Count && glyph2class >= 0 && glyph2class < class2Count) { - stbtt_uint8 *class1Records = table + 16; - stbtt_uint8 *class2Records = class1Records + 2 * (glyph1class * class2Count); - stbtt_int16 xAdvance = ttSHORT(class2Records + 2 * glyph2class); - return xAdvance; - } - } break; - - default: { - // There are no other cases. - STBTT_assert(0); - break; - }; - } - } - break; - }; - - default: - // TODO: Implement other stuff. - break; - } - } - - return 0; -} - -STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1, int g2) -{ - int xAdvance = 0; - - if (info->gpos) - xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, g1, g2); - else if (info->kern) - xAdvance += stbtt__GetGlyphKernInfoAdvance(info, g1, g2); - - return xAdvance; -} - -STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2) -{ - if (!info->kern && !info->gpos) // if no kerning table, don't waste time looking up both codepoint->glyphs - return 0; - return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2)); -} - -STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing) -{ - stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing); -} - -STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap) -{ - if (ascent ) *ascent = ttSHORT(info->data+info->hhea + 4); - if (descent) *descent = ttSHORT(info->data+info->hhea + 6); - if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8); -} - -STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap) -{ - int tab = stbtt__find_table(info->data, info->fontstart, "OS/2"); - if (!tab) - return 0; - if (typoAscent ) *typoAscent = ttSHORT(info->data+tab + 68); - if (typoDescent) *typoDescent = ttSHORT(info->data+tab + 70); - if (typoLineGap) *typoLineGap = ttSHORT(info->data+tab + 72); - return 1; -} - -STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1) -{ - *x0 = ttSHORT(info->data + info->head + 36); - *y0 = ttSHORT(info->data + info->head + 38); - *x1 = ttSHORT(info->data + info->head + 40); - *y1 = ttSHORT(info->data + info->head + 42); -} - -STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height) -{ - int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6); - return (float) height / fheight; -} - -STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels) -{ - int unitsPerEm = ttUSHORT(info->data + info->head + 18); - return pixels / unitsPerEm; -} - -STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v) -{ - STBTT_free(v, info->userdata); -} - -STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl) -{ - int i; - stbtt_uint8 *data = info->data; - stbtt_uint8 *svg_doc_list = data + stbtt__get_svg((stbtt_fontinfo *) info); - - int numEntries = ttUSHORT(svg_doc_list); - stbtt_uint8 *svg_docs = svg_doc_list + 2; - - for(i=0; i= ttUSHORT(svg_doc)) && (gl <= ttUSHORT(svg_doc + 2))) - return svg_doc; - } - return 0; -} - -STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg) -{ - stbtt_uint8 *data = info->data; - stbtt_uint8 *svg_doc; - - if (info->svg == 0) - return 0; - - svg_doc = stbtt_FindSVGDoc(info, gl); - if (svg_doc != NULL) { - *svg = (char *) data + info->svg + ttULONG(svg_doc + 4); - return ttULONG(svg_doc + 8); - } else { - return 0; - } -} - -STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg) -{ - return stbtt_GetGlyphSVG(info, stbtt_FindGlyphIndex(info, unicode_codepoint), svg); -} - -////////////////////////////////////////////////////////////////////////////// -// -// antialiasing software rasterizer -// - -STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1) -{ - int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning - if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) { - // e.g. space character - if (ix0) *ix0 = 0; - if (iy0) *iy0 = 0; - if (ix1) *ix1 = 0; - if (iy1) *iy1 = 0; - } else { - // move to integral bboxes (treating pixels as little squares, what pixels get touched)? - if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x); - if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y); - if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x); - if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y); - } -} - -STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1) -{ - stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1); -} - -STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1) -{ - stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1); -} - -STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1) -{ - stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1); -} - -////////////////////////////////////////////////////////////////////////////// -// -// Rasterizer - -typedef struct stbtt__hheap_chunk -{ - struct stbtt__hheap_chunk *next; -} stbtt__hheap_chunk; - -typedef struct stbtt__hheap -{ - struct stbtt__hheap_chunk *head; - void *first_free; - int num_remaining_in_head_chunk; -} stbtt__hheap; - -static void *stbtt__hheap_alloc(stbtt__hheap *hh, size_t size, void *userdata) -{ - if (hh->first_free) { - void *p = hh->first_free; - hh->first_free = * (void **) p; - return p; - } else { - if (hh->num_remaining_in_head_chunk == 0) { - int count = (size < 32 ? 2000 : size < 128 ? 800 : 100); - stbtt__hheap_chunk *c = (stbtt__hheap_chunk *) STBTT_malloc(sizeof(stbtt__hheap_chunk) + size * count, userdata); - if (c == NULL) - return NULL; - c->next = hh->head; - hh->head = c; - hh->num_remaining_in_head_chunk = count; - } - --hh->num_remaining_in_head_chunk; - return (char *) (hh->head) + sizeof(stbtt__hheap_chunk) + size * hh->num_remaining_in_head_chunk; - } -} - -static void stbtt__hheap_free(stbtt__hheap *hh, void *p) -{ - *(void **) p = hh->first_free; - hh->first_free = p; -} - -static void stbtt__hheap_cleanup(stbtt__hheap *hh, void *userdata) -{ - stbtt__hheap_chunk *c = hh->head; - while (c) { - stbtt__hheap_chunk *n = c->next; - STBTT_free(c, userdata); - c = n; - } -} - -typedef struct stbtt__edge { - float x0,y0, x1,y1; - int invert; -} stbtt__edge; - - -typedef struct stbtt__active_edge -{ - struct stbtt__active_edge *next; - #if STBTT_RASTERIZER_VERSION==1 - int x,dx; - float ey; - int direction; - #elif STBTT_RASTERIZER_VERSION==2 - float fx,fdx,fdy; - float direction; - float sy; - float ey; - #else - #error "Unrecognized value of STBTT_RASTERIZER_VERSION" - #endif -} stbtt__active_edge; - -#if STBTT_RASTERIZER_VERSION == 1 -#define STBTT_FIXSHIFT 10 -#define STBTT_FIX (1 << STBTT_FIXSHIFT) -#define STBTT_FIXMASK (STBTT_FIX-1) - -static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata) -{ - stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata); - float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0); - STBTT_assert(z != NULL); - if (!z) return z; - - // round dx down to avoid overshooting - if (dxdy < 0) - z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy); - else - z->dx = STBTT_ifloor(STBTT_FIX * dxdy); - - z->x = STBTT_ifloor(STBTT_FIX * e->x0 + z->dx * (start_point - e->y0)); // use z->dx so when we offset later it's by the same amount - z->x -= off_x * STBTT_FIX; - - z->ey = e->y1; - z->next = 0; - z->direction = e->invert ? 1 : -1; - return z; -} -#elif STBTT_RASTERIZER_VERSION == 2 -static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata) -{ - stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata); - float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0); - STBTT_assert(z != NULL); - //STBTT_assert(e->y0 <= start_point); - if (!z) return z; - z->fdx = dxdy; - z->fdy = dxdy != 0.0f ? (1.0f/dxdy) : 0.0f; - z->fx = e->x0 + dxdy * (start_point - e->y0); - z->fx -= off_x; - z->direction = e->invert ? 1.0f : -1.0f; - z->sy = e->y0; - z->ey = e->y1; - z->next = 0; - return z; -} -#else -#error "Unrecognized value of STBTT_RASTERIZER_VERSION" -#endif - -#if STBTT_RASTERIZER_VERSION == 1 -// note: this routine clips fills that extend off the edges... ideally this -// wouldn't happen, but it could happen if the truetype glyph bounding boxes -// are wrong, or if the user supplies a too-small bitmap -static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight) -{ - // non-zero winding fill - int x0=0, w=0; - - while (e) { - if (w == 0) { - // if we're currently at zero, we need to record the edge start point - x0 = e->x; w += e->direction; - } else { - int x1 = e->x; w += e->direction; - // if we went to zero, we need to draw - if (w == 0) { - int i = x0 >> STBTT_FIXSHIFT; - int j = x1 >> STBTT_FIXSHIFT; - - if (i < len && j >= 0) { - if (i == j) { - // x0,x1 are the same pixel, so compute combined coverage - scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> STBTT_FIXSHIFT); - } else { - if (i >= 0) // add antialiasing for x0 - scanline[i] = scanline[i] + (stbtt_uint8) (((STBTT_FIX - (x0 & STBTT_FIXMASK)) * max_weight) >> STBTT_FIXSHIFT); - else - i = -1; // clip - - if (j < len) // add antialiasing for x1 - scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & STBTT_FIXMASK) * max_weight) >> STBTT_FIXSHIFT); - else - j = len; // clip - - for (++i; i < j; ++i) // fill pixels between x0 and x1 - scanline[i] = scanline[i] + (stbtt_uint8) max_weight; - } - } - } - } - - e = e->next; - } -} - -static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata) -{ - stbtt__hheap hh = { 0, 0, 0 }; - stbtt__active_edge *active = NULL; - int y,j=0; - int max_weight = (255 / vsubsample); // weight per vertical scanline - int s; // vertical subsample index - unsigned char scanline_data[512], *scanline; - - if (result->w > 512) - scanline = (unsigned char *) STBTT_malloc(result->w, userdata); - else - scanline = scanline_data; - - y = off_y * vsubsample; - e[n].y0 = (off_y + result->h) * (float) vsubsample + 1; - - while (j < result->h) { - STBTT_memset(scanline, 0, result->w); - for (s=0; s < vsubsample; ++s) { - // find center of pixel for this scanline - float scan_y = y + 0.5f; - stbtt__active_edge **step = &active; - - // update all active edges; - // remove all active edges that terminate before the center of this scanline - while (*step) { - stbtt__active_edge * z = *step; - if (z->ey <= scan_y) { - *step = z->next; // delete from list - STBTT_assert(z->direction); - z->direction = 0; - stbtt__hheap_free(&hh, z); - } else { - z->x += z->dx; // advance to position for current scanline - step = &((*step)->next); // advance through list - } - } - - // resort the list if needed - for(;;) { - int changed=0; - step = &active; - while (*step && (*step)->next) { - if ((*step)->x > (*step)->next->x) { - stbtt__active_edge *t = *step; - stbtt__active_edge *q = t->next; - - t->next = q->next; - q->next = t; - *step = q; - changed = 1; - } - step = &(*step)->next; - } - if (!changed) break; - } - - // insert all edges that start before the center of this scanline -- omit ones that also end on this scanline - while (e->y0 <= scan_y) { - if (e->y1 > scan_y) { - stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata); - if (z != NULL) { - // find insertion point - if (active == NULL) - active = z; - else if (z->x < active->x) { - // insert at front - z->next = active; - active = z; - } else { - // find thing to insert AFTER - stbtt__active_edge *p = active; - while (p->next && p->next->x < z->x) - p = p->next; - // at this point, p->next->x is NOT < z->x - z->next = p->next; - p->next = z; - } - } - } - ++e; - } - - // now process all active edges in XOR fashion - if (active) - stbtt__fill_active_edges(scanline, result->w, active, max_weight); - - ++y; - } - STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w); - ++j; - } - - stbtt__hheap_cleanup(&hh, userdata); - - if (scanline != scanline_data) - STBTT_free(scanline, userdata); -} - -#elif STBTT_RASTERIZER_VERSION == 2 - -// the edge passed in here does not cross the vertical line at x or the vertical line at x+1 -// (i.e. it has already been clipped to those) -static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edge *e, float x0, float y0, float x1, float y1) -{ - if (y0 == y1) return; - STBTT_assert(y0 < y1); - STBTT_assert(e->sy <= e->ey); - if (y0 > e->ey) return; - if (y1 < e->sy) return; - if (y0 < e->sy) { - x0 += (x1-x0) * (e->sy - y0) / (y1-y0); - y0 = e->sy; - } - if (y1 > e->ey) { - x1 += (x1-x0) * (e->ey - y1) / (y1-y0); - y1 = e->ey; - } - - if (x0 == x) - STBTT_assert(x1 <= x+1); - else if (x0 == x+1) - STBTT_assert(x1 >= x); - else if (x0 <= x) - STBTT_assert(x1 <= x); - else if (x0 >= x+1) - STBTT_assert(x1 >= x+1); - else - STBTT_assert(x1 >= x && x1 <= x+1); - - if (x0 <= x && x1 <= x) - scanline[x] += e->direction * (y1-y0); - else if (x0 >= x+1 && x1 >= x+1) - ; - else { - STBTT_assert(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1); - scanline[x] += e->direction * (y1-y0) * (1-((x0-x)+(x1-x))/2); // coverage = 1 - average x position - } -} - -static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top) -{ - float y_bottom = y_top+1; - - while (e) { - // brute force every pixel - - // compute intersection points with top & bottom - STBTT_assert(e->ey >= y_top); - - if (e->fdx == 0) { - float x0 = e->fx; - if (x0 < len) { - if (x0 >= 0) { - stbtt__handle_clipped_edge(scanline,(int) x0,e, x0,y_top, x0,y_bottom); - stbtt__handle_clipped_edge(scanline_fill-1,(int) x0+1,e, x0,y_top, x0,y_bottom); - } else { - stbtt__handle_clipped_edge(scanline_fill-1,0,e, x0,y_top, x0,y_bottom); - } - } - } else { - float x0 = e->fx; - float dx = e->fdx; - float xb = x0 + dx; - float x_top, x_bottom; - float sy0,sy1; - float dy = e->fdy; - STBTT_assert(e->sy <= y_bottom && e->ey >= y_top); - - // compute endpoints of line segment clipped to this scanline (if the - // line segment starts on this scanline. x0 is the intersection of the - // line with y_top, but that may be off the line segment. - if (e->sy > y_top) { - x_top = x0 + dx * (e->sy - y_top); - sy0 = e->sy; - } else { - x_top = x0; - sy0 = y_top; - } - if (e->ey < y_bottom) { - x_bottom = x0 + dx * (e->ey - y_top); - sy1 = e->ey; - } else { - x_bottom = xb; - sy1 = y_bottom; - } - - if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) { - // from here on, we don't have to range check x values - - if ((int) x_top == (int) x_bottom) { - float height; - // simple case, only spans one pixel - int x = (int) x_top; - height = sy1 - sy0; - STBTT_assert(x >= 0 && x < len); - scanline[x] += e->direction * (1-((x_top - x) + (x_bottom-x))/2) * height; - scanline_fill[x] += e->direction * height; // everything right of this pixel is filled - } else { - int x,x1,x2; - float y_crossing, step, sign, area; - // covers 2+ pixels - if (x_top > x_bottom) { - // flip scanline vertically; signed area is the same - float t; - sy0 = y_bottom - (sy0 - y_top); - sy1 = y_bottom - (sy1 - y_top); - t = sy0, sy0 = sy1, sy1 = t; - t = x_bottom, x_bottom = x_top, x_top = t; - dx = -dx; - dy = -dy; - t = x0, x0 = xb, xb = t; - } - - x1 = (int) x_top; - x2 = (int) x_bottom; - // compute intersection with y axis at x1+1 - y_crossing = (x1+1 - x0) * dy + y_top; - - sign = e->direction; - // area of the rectangle covered from y0..y_crossing - area = sign * (y_crossing-sy0); - // area of the triangle (x_top,y0), (x+1,y0), (x+1,y_crossing) - scanline[x1] += area * (1-((x_top - x1)+(x1+1-x1))/2); - - step = sign * dy; - for (x = x1+1; x < x2; ++x) { - scanline[x] += area + step/2; - area += step; - } - y_crossing += dy * (x2 - (x1+1)); - - STBTT_assert(STBTT_fabs(area) <= 1.01f); - - scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (sy1-y_crossing); - - scanline_fill[x2] += sign * (sy1-sy0); - } - } else { - // if edge goes outside of box we're drawing, we require - // clipping logic. since this does not match the intended use - // of this library, we use a different, very slow brute - // force implementation - int x; - for (x=0; x < len; ++x) { - // cases: - // - // there can be up to two intersections with the pixel. any intersection - // with left or right edges can be handled by splitting into two (or three) - // regions. intersections with top & bottom do not necessitate case-wise logic. - // - // the old way of doing this found the intersections with the left & right edges, - // then used some simple logic to produce up to three segments in sorted order - // from top-to-bottom. however, this had a problem: if an x edge was epsilon - // across the x border, then the corresponding y position might not be distinct - // from the other y segment, and it might ignored as an empty segment. to avoid - // that, we need to explicitly produce segments based on x positions. - - // rename variables to clearly-defined pairs - float y0 = y_top; - float x1 = (float) (x); - float x2 = (float) (x+1); - float x3 = xb; - float y3 = y_bottom; - - // x = e->x + e->dx * (y-y_top) - // (y-y_top) = (x - e->x) / e->dx - // y = (x - e->x) / e->dx + y_top - float y1 = (x - x0) / dx + y_top; - float y2 = (x+1 - x0) / dx + y_top; - - if (x0 < x1 && x3 > x2) { // three segments descending down-right - stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1); - stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x2,y2); - stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3); - } else if (x3 < x1 && x0 > x2) { // three segments descending down-left - stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2); - stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x1,y1); - stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3); - } else if (x0 < x1 && x3 > x1) { // two segments across x, down-right - stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1); - stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3); - } else if (x3 < x1 && x0 > x1) { // two segments across x, down-left - stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1); - stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3); - } else if (x0 < x2 && x3 > x2) { // two segments across x+1, down-right - stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2); - stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3); - } else if (x3 < x2 && x0 > x2) { // two segments across x+1, down-left - stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2); - stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3); - } else { // one segment - stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x3,y3); - } - } - } - } - e = e->next; - } -} - -// directly AA rasterize edges w/o supersampling -static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata) -{ - stbtt__hheap hh = { 0, 0, 0 }; - stbtt__active_edge *active = NULL; - int y,j=0, i; - float scanline_data[129], *scanline, *scanline2; - - STBTT__NOTUSED(vsubsample); - - if (result->w > 64) - scanline = (float *) STBTT_malloc((result->w*2+1) * sizeof(float), userdata); - else - scanline = scanline_data; - - scanline2 = scanline + result->w; - - y = off_y; - e[n].y0 = (float) (off_y + result->h) + 1; - - while (j < result->h) { - // find center of pixel for this scanline - float scan_y_top = y + 0.0f; - float scan_y_bottom = y + 1.0f; - stbtt__active_edge **step = &active; - - STBTT_memset(scanline , 0, result->w*sizeof(scanline[0])); - STBTT_memset(scanline2, 0, (result->w+1)*sizeof(scanline[0])); - - // update all active edges; - // remove all active edges that terminate before the top of this scanline - while (*step) { - stbtt__active_edge * z = *step; - if (z->ey <= scan_y_top) { - *step = z->next; // delete from list - STBTT_assert(z->direction); - z->direction = 0; - stbtt__hheap_free(&hh, z); - } else { - step = &((*step)->next); // advance through list - } - } - - // insert all edges that start before the bottom of this scanline - while (e->y0 <= scan_y_bottom) { - if (e->y0 != e->y1) { - stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata); - if (z != NULL) { - if (j == 0 && off_y != 0) { - if (z->ey < scan_y_top) { - // this can happen due to subpixel positioning and some kind of fp rounding error i think - z->ey = scan_y_top; - } - } - STBTT_assert(z->ey >= scan_y_top); // if we get really unlucky a tiny bit of an edge can be out of bounds - // insert at front - z->next = active; - active = z; - } - } - ++e; - } - - // now process all active edges - if (active) - stbtt__fill_active_edges_new(scanline, scanline2+1, result->w, active, scan_y_top); - - { - float sum = 0; - for (i=0; i < result->w; ++i) { - float k; - int m; - sum += scanline2[i]; - k = scanline[i] + sum; - k = (float) STBTT_fabs(k)*255 + 0.5f; - m = (int) k; - if (m > 255) m = 255; - result->pixels[j*result->stride + i] = (unsigned char) m; - } - } - // advance all the edges - step = &active; - while (*step) { - stbtt__active_edge *z = *step; - z->fx += z->fdx; // advance to position for current scanline - step = &((*step)->next); // advance through list - } - - ++y; - ++j; - } - - stbtt__hheap_cleanup(&hh, userdata); - - if (scanline != scanline_data) - STBTT_free(scanline, userdata); -} -#else -#error "Unrecognized value of STBTT_RASTERIZER_VERSION" -#endif - -#define STBTT__COMPARE(a,b) ((a)->y0 < (b)->y0) - -static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n) -{ - int i,j; - for (i=1; i < n; ++i) { - stbtt__edge t = p[i], *a = &t; - j = i; - while (j > 0) { - stbtt__edge *b = &p[j-1]; - int c = STBTT__COMPARE(a,b); - if (!c) break; - p[j] = p[j-1]; - --j; - } - if (i != j) - p[j] = t; - } -} - -static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n) -{ - /* threshold for transitioning to insertion sort */ - while (n > 12) { - stbtt__edge t; - int c01,c12,c,m,i,j; - - /* compute median of three */ - m = n >> 1; - c01 = STBTT__COMPARE(&p[0],&p[m]); - c12 = STBTT__COMPARE(&p[m],&p[n-1]); - /* if 0 >= mid >= end, or 0 < mid < end, then use mid */ - if (c01 != c12) { - /* otherwise, we'll need to swap something else to middle */ - int z; - c = STBTT__COMPARE(&p[0],&p[n-1]); - /* 0>mid && midn => n; 0 0 */ - /* 0n: 0>n => 0; 0 n */ - z = (c == c12) ? 0 : n-1; - t = p[z]; - p[z] = p[m]; - p[m] = t; - } - /* now p[m] is the median-of-three */ - /* swap it to the beginning so it won't move around */ - t = p[0]; - p[0] = p[m]; - p[m] = t; - - /* partition loop */ - i=1; - j=n-1; - for(;;) { - /* handling of equality is crucial here */ - /* for sentinels & efficiency with duplicates */ - for (;;++i) { - if (!STBTT__COMPARE(&p[i], &p[0])) break; - } - for (;;--j) { - if (!STBTT__COMPARE(&p[0], &p[j])) break; - } - /* make sure we haven't crossed */ - if (i >= j) break; - t = p[i]; - p[i] = p[j]; - p[j] = t; - - ++i; - --j; - } - /* recurse on smaller side, iterate on larger */ - if (j < (n-i)) { - stbtt__sort_edges_quicksort(p,j); - p = p+i; - n = n-i; - } else { - stbtt__sort_edges_quicksort(p+i, n-i); - n = j; - } - } -} - -static void stbtt__sort_edges(stbtt__edge *p, int n) -{ - stbtt__sort_edges_quicksort(p, n); - stbtt__sort_edges_ins_sort(p, n); -} - -typedef struct -{ - float x,y; -} stbtt__point; - -static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata) -{ - float y_scale_inv = invert ? -scale_y : scale_y; - stbtt__edge *e; - int n,i,j,k,m; -#if STBTT_RASTERIZER_VERSION == 1 - int vsubsample = result->h < 8 ? 15 : 5; -#elif STBTT_RASTERIZER_VERSION == 2 - int vsubsample = 1; -#else - #error "Unrecognized value of STBTT_RASTERIZER_VERSION" -#endif - // vsubsample should divide 255 evenly; otherwise we won't reach full opacity - - // now we have to blow out the windings into explicit edge lists - n = 0; - for (i=0; i < windings; ++i) - n += wcount[i]; - - e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel - if (e == 0) return; - n = 0; - - m=0; - for (i=0; i < windings; ++i) { - stbtt__point *p = pts + m; - m += wcount[i]; - j = wcount[i]-1; - for (k=0; k < wcount[i]; j=k++) { - int a=k,b=j; - // skip the edge if horizontal - if (p[j].y == p[k].y) - continue; - // add edge from j to k to the list - e[n].invert = 0; - if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) { - e[n].invert = 1; - a=j,b=k; - } - e[n].x0 = p[a].x * scale_x + shift_x; - e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample; - e[n].x1 = p[b].x * scale_x + shift_x; - e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample; - ++n; - } - } - - // now sort the edges by their highest point (should snap to integer, and then by x) - //STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare); - stbtt__sort_edges(e, n); - - // now, traverse the scanlines and find the intersections on each scanline, use xor winding rule - stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata); - - STBTT_free(e, userdata); -} - -static void stbtt__add_point(stbtt__point *points, int n, float x, float y) -{ - if (!points) return; // during first pass, it's unallocated - points[n].x = x; - points[n].y = y; -} - -// tessellate until threshold p is happy... @TODO warped to compensate for non-linear stretching -static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n) -{ - // midpoint - float mx = (x0 + 2*x1 + x2)/4; - float my = (y0 + 2*y1 + y2)/4; - // versus directly drawn line - float dx = (x0+x2)/2 - mx; - float dy = (y0+y2)/2 - my; - if (n > 16) // 65536 segments on one curve better be enough! - return 1; - if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA - stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1); - stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1); - } else { - stbtt__add_point(points, *num_points,x2,y2); - *num_points = *num_points+1; - } - return 1; -} - -static void stbtt__tesselate_cubic(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3, float objspace_flatness_squared, int n) -{ - // @TODO this "flatness" calculation is just made-up nonsense that seems to work well enough - float dx0 = x1-x0; - float dy0 = y1-y0; - float dx1 = x2-x1; - float dy1 = y2-y1; - float dx2 = x3-x2; - float dy2 = y3-y2; - float dx = x3-x0; - float dy = y3-y0; - float longlen = (float) (STBTT_sqrt(dx0*dx0+dy0*dy0)+STBTT_sqrt(dx1*dx1+dy1*dy1)+STBTT_sqrt(dx2*dx2+dy2*dy2)); - float shortlen = (float) STBTT_sqrt(dx*dx+dy*dy); - float flatness_squared = longlen*longlen-shortlen*shortlen; - - if (n > 16) // 65536 segments on one curve better be enough! - return; - - if (flatness_squared > objspace_flatness_squared) { - float x01 = (x0+x1)/2; - float y01 = (y0+y1)/2; - float x12 = (x1+x2)/2; - float y12 = (y1+y2)/2; - float x23 = (x2+x3)/2; - float y23 = (y2+y3)/2; - - float xa = (x01+x12)/2; - float ya = (y01+y12)/2; - float xb = (x12+x23)/2; - float yb = (y12+y23)/2; - - float mx = (xa+xb)/2; - float my = (ya+yb)/2; - - stbtt__tesselate_cubic(points, num_points, x0,y0, x01,y01, xa,ya, mx,my, objspace_flatness_squared,n+1); - stbtt__tesselate_cubic(points, num_points, mx,my, xb,yb, x23,y23, x3,y3, objspace_flatness_squared,n+1); - } else { - stbtt__add_point(points, *num_points,x3,y3); - *num_points = *num_points+1; - } -} - -// returns number of contours -static stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata) -{ - stbtt__point *points=0; - int num_points=0; - - float objspace_flatness_squared = objspace_flatness * objspace_flatness; - int i,n=0,start=0, pass; - - // count how many "moves" there are to get the contour count - for (i=0; i < num_verts; ++i) - if (vertices[i].type == STBTT_vmove) - ++n; - - *num_contours = n; - if (n == 0) return 0; - - *contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata); - - if (*contour_lengths == 0) { - *num_contours = 0; - return 0; - } - - // make two passes through the points so we don't need to realloc - for (pass=0; pass < 2; ++pass) { - float x=0,y=0; - if (pass == 1) { - points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata); - if (points == NULL) goto error; - } - num_points = 0; - n= -1; - for (i=0; i < num_verts; ++i) { - switch (vertices[i].type) { - case STBTT_vmove: - // start the next contour - if (n >= 0) - (*contour_lengths)[n] = num_points - start; - ++n; - start = num_points; - - x = vertices[i].x, y = vertices[i].y; - stbtt__add_point(points, num_points++, x,y); - break; - case STBTT_vline: - x = vertices[i].x, y = vertices[i].y; - stbtt__add_point(points, num_points++, x, y); - break; - case STBTT_vcurve: - stbtt__tesselate_curve(points, &num_points, x,y, - vertices[i].cx, vertices[i].cy, - vertices[i].x, vertices[i].y, - objspace_flatness_squared, 0); - x = vertices[i].x, y = vertices[i].y; - break; - case STBTT_vcubic: - stbtt__tesselate_cubic(points, &num_points, x,y, - vertices[i].cx, vertices[i].cy, - vertices[i].cx1, vertices[i].cy1, - vertices[i].x, vertices[i].y, - objspace_flatness_squared, 0); - x = vertices[i].x, y = vertices[i].y; - break; - } - } - (*contour_lengths)[n] = num_points - start; - } - - return points; -error: - STBTT_free(points, userdata); - STBTT_free(*contour_lengths, userdata); - *contour_lengths = 0; - *num_contours = 0; - return NULL; -} - -STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata) -{ - float scale = scale_x > scale_y ? scale_y : scale_x; - int winding_count = 0; - int *winding_lengths = NULL; - stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata); - if (windings) { - stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata); - STBTT_free(winding_lengths, userdata); - STBTT_free(windings, userdata); - } -} - -STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata) -{ - STBTT_free(bitmap, userdata); -} - -STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff) -{ - int ix0,iy0,ix1,iy1; - stbtt__bitmap gbm; - stbtt_vertex *vertices; - int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices); - - if (scale_x == 0) scale_x = scale_y; - if (scale_y == 0) { - if (scale_x == 0) { - STBTT_free(vertices, info->userdata); - return NULL; - } - scale_y = scale_x; - } - - stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1); - - // now we get the size - gbm.w = (ix1 - ix0); - gbm.h = (iy1 - iy0); - gbm.pixels = NULL; // in case we error - - if (width ) *width = gbm.w; - if (height) *height = gbm.h; - if (xoff ) *xoff = ix0; - if (yoff ) *yoff = iy0; - - if (gbm.w && gbm.h) { - gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata); - if (gbm.pixels) { - gbm.stride = gbm.w; - - stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata); - } - } - STBTT_free(vertices, info->userdata); - return gbm.pixels; -} - -STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff) -{ - return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff); -} - -STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph) -{ - int ix0,iy0; - stbtt_vertex *vertices; - int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices); - stbtt__bitmap gbm; - - stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0); - gbm.pixels = output; - gbm.w = out_w; - gbm.h = out_h; - gbm.stride = out_stride; - - if (gbm.w && gbm.h) - stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata); - - STBTT_free(vertices, info->userdata); -} - -STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph) -{ - stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph); -} - -STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff) -{ - return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff); -} - -STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint) -{ - stbtt_MakeGlyphBitmapSubpixelPrefilter(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, oversample_x, oversample_y, sub_x, sub_y, stbtt_FindGlyphIndex(info,codepoint)); -} - -STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint) -{ - stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint)); -} - -STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff) -{ - return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff); -} - -STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint) -{ - stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint); -} - -////////////////////////////////////////////////////////////////////////////// -// -// bitmap baking -// -// This is SUPER-CRAPPY packing to keep source code small - -static int stbtt_BakeFontBitmap_internal(unsigned char *data, int offset, // font location (use offset=0 for plain .ttf) - float pixel_height, // height of font in pixels - unsigned char *pixels, int pw, int ph, // bitmap to be filled in - int first_char, int num_chars, // characters to bake - stbtt_bakedchar *chardata) -{ - float scale; - int x,y,bottom_y, i; - stbtt_fontinfo f; - f.userdata = NULL; - if (!stbtt_InitFont(&f, data, offset)) - return -1; - STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels - x=y=1; - bottom_y = 1; - - scale = stbtt_ScaleForPixelHeight(&f, pixel_height); - - for (i=0; i < num_chars; ++i) { - int advance, lsb, x0,y0,x1,y1,gw,gh; - int g = stbtt_FindGlyphIndex(&f, first_char + i); - stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb); - stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1); - gw = x1-x0; - gh = y1-y0; - if (x + gw + 1 >= pw) - y = bottom_y, x = 1; // advance to next row - if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row - return -i; - STBTT_assert(x+gw < pw); - STBTT_assert(y+gh < ph); - stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g); - chardata[i].x0 = (stbtt_int16) x; - chardata[i].y0 = (stbtt_int16) y; - chardata[i].x1 = (stbtt_int16) (x + gw); - chardata[i].y1 = (stbtt_int16) (y + gh); - chardata[i].xadvance = scale * advance; - chardata[i].xoff = (float) x0; - chardata[i].yoff = (float) y0; - x = x + gw + 1; - if (y+gh+1 > bottom_y) - bottom_y = y+gh+1; - } - return bottom_y; -} - -STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule) -{ - float d3d_bias = opengl_fillrule ? 0 : -0.5f; - float ipw = 1.0f / pw, iph = 1.0f / ph; - const stbtt_bakedchar *b = chardata + char_index; - int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f); - int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f); - - q->x0 = round_x + d3d_bias; - q->y0 = round_y + d3d_bias; - q->x1 = round_x + b->x1 - b->x0 + d3d_bias; - q->y1 = round_y + b->y1 - b->y0 + d3d_bias; - - q->s0 = b->x0 * ipw; - q->t0 = b->y0 * iph; - q->s1 = b->x1 * ipw; - q->t1 = b->y1 * iph; - - *xpos += b->xadvance; -} - -////////////////////////////////////////////////////////////////////////////// -// -// rectangle packing replacement routines if you don't have stb_rect_pack.h -// - -#ifndef STB_RECT_PACK_VERSION - -typedef int stbrp_coord; - -//////////////////////////////////////////////////////////////////////////////////// -// // -// // -// COMPILER WARNING ?!?!? // -// // -// // -// if you get a compile warning due to these symbols being defined more than // -// once, move #include "stb_rect_pack.h" before #include "stb_truetype.h" // -// // -//////////////////////////////////////////////////////////////////////////////////// - -typedef struct -{ - int width,height; - int x,y,bottom_y; -} stbrp_context; - -typedef struct -{ - unsigned char x; -} stbrp_node; - -struct stbrp_rect -{ - stbrp_coord x,y; - int id,w,h,was_packed; -}; - -static void stbrp_init_target(stbrp_context *con, int pw, int ph, stbrp_node *nodes, int num_nodes) -{ - con->width = pw; - con->height = ph; - con->x = 0; - con->y = 0; - con->bottom_y = 0; - STBTT__NOTUSED(nodes); - STBTT__NOTUSED(num_nodes); -} - -static void stbrp_pack_rects(stbrp_context *con, stbrp_rect *rects, int num_rects) -{ - int i; - for (i=0; i < num_rects; ++i) { - if (con->x + rects[i].w > con->width) { - con->x = 0; - con->y = con->bottom_y; - } - if (con->y + rects[i].h > con->height) - break; - rects[i].x = con->x; - rects[i].y = con->y; - rects[i].was_packed = 1; - con->x += rects[i].w; - if (con->y + rects[i].h > con->bottom_y) - con->bottom_y = con->y + rects[i].h; - } - for ( ; i < num_rects; ++i) - rects[i].was_packed = 0; -} -#endif - -////////////////////////////////////////////////////////////////////////////// -// -// bitmap baking -// -// This is SUPER-AWESOME (tm Ryan Gordon) packing using stb_rect_pack.h. If -// stb_rect_pack.h isn't available, it uses the BakeFontBitmap strategy. - -STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int pw, int ph, int stride_in_bytes, int padding, void *alloc_context) -{ - stbrp_context *context = (stbrp_context *) STBTT_malloc(sizeof(*context) ,alloc_context); - int num_nodes = pw - padding; - stbrp_node *nodes = (stbrp_node *) STBTT_malloc(sizeof(*nodes ) * num_nodes,alloc_context); - - if (context == NULL || nodes == NULL) { - if (context != NULL) STBTT_free(context, alloc_context); - if (nodes != NULL) STBTT_free(nodes , alloc_context); - return 0; - } - - spc->user_allocator_context = alloc_context; - spc->width = pw; - spc->height = ph; - spc->pixels = pixels; - spc->pack_info = context; - spc->nodes = nodes; - spc->padding = padding; - spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw; - spc->h_oversample = 1; - spc->v_oversample = 1; - spc->skip_missing = 0; - - stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes); - - if (pixels) - STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels - - return 1; -} - -STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc) -{ - STBTT_free(spc->nodes , spc->user_allocator_context); - STBTT_free(spc->pack_info, spc->user_allocator_context); -} - -STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample) -{ - STBTT_assert(h_oversample <= STBTT_MAX_OVERSAMPLE); - STBTT_assert(v_oversample <= STBTT_MAX_OVERSAMPLE); - if (h_oversample <= STBTT_MAX_OVERSAMPLE) - spc->h_oversample = h_oversample; - if (v_oversample <= STBTT_MAX_OVERSAMPLE) - spc->v_oversample = v_oversample; -} - -STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip) -{ - spc->skip_missing = skip; -} - -#define STBTT__OVER_MASK (STBTT_MAX_OVERSAMPLE-1) - -static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width) -{ - unsigned char buffer[STBTT_MAX_OVERSAMPLE]; - int safe_w = w - kernel_width; - int j; - STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze - for (j=0; j < h; ++j) { - int i; - unsigned int total; - STBTT_memset(buffer, 0, kernel_width); - - total = 0; - - // make kernel_width a constant in common cases so compiler can optimize out the divide - switch (kernel_width) { - case 2: - for (i=0; i <= safe_w; ++i) { - total += pixels[i] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; - pixels[i] = (unsigned char) (total / 2); - } - break; - case 3: - for (i=0; i <= safe_w; ++i) { - total += pixels[i] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; - pixels[i] = (unsigned char) (total / 3); - } - break; - case 4: - for (i=0; i <= safe_w; ++i) { - total += pixels[i] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; - pixels[i] = (unsigned char) (total / 4); - } - break; - case 5: - for (i=0; i <= safe_w; ++i) { - total += pixels[i] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; - pixels[i] = (unsigned char) (total / 5); - } - break; - default: - for (i=0; i <= safe_w; ++i) { - total += pixels[i] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; - pixels[i] = (unsigned char) (total / kernel_width); - } - break; - } - - for (; i < w; ++i) { - STBTT_assert(pixels[i] == 0); - total -= buffer[i & STBTT__OVER_MASK]; - pixels[i] = (unsigned char) (total / kernel_width); - } - - pixels += stride_in_bytes; - } -} - -static void stbtt__v_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width) -{ - unsigned char buffer[STBTT_MAX_OVERSAMPLE]; - int safe_h = h - kernel_width; - int j; - STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze - for (j=0; j < w; ++j) { - int i; - unsigned int total; - STBTT_memset(buffer, 0, kernel_width); - - total = 0; - - // make kernel_width a constant in common cases so compiler can optimize out the divide - switch (kernel_width) { - case 2: - for (i=0; i <= safe_h; ++i) { - total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; - pixels[i*stride_in_bytes] = (unsigned char) (total / 2); - } - break; - case 3: - for (i=0; i <= safe_h; ++i) { - total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; - pixels[i*stride_in_bytes] = (unsigned char) (total / 3); - } - break; - case 4: - for (i=0; i <= safe_h; ++i) { - total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; - pixels[i*stride_in_bytes] = (unsigned char) (total / 4); - } - break; - case 5: - for (i=0; i <= safe_h; ++i) { - total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; - pixels[i*stride_in_bytes] = (unsigned char) (total / 5); - } - break; - default: - for (i=0; i <= safe_h; ++i) { - total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; - buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; - pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width); - } - break; - } - - for (; i < h; ++i) { - STBTT_assert(pixels[i*stride_in_bytes] == 0); - total -= buffer[i & STBTT__OVER_MASK]; - pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width); - } - - pixels += 1; - } -} - -static float stbtt__oversample_shift(int oversample) -{ - if (!oversample) - return 0.0f; - - // The prefilter is a box filter of width "oversample", - // which shifts phase by (oversample - 1)/2 pixels in - // oversampled space. We want to shift in the opposite - // direction to counter this. - return (float)-(oversample - 1) / (2.0f * (float)oversample); -} - -// rects array must be big enough to accommodate all characters in the given ranges -STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects) -{ - int i,j,k; - int missing_glyph_added = 0; - - k=0; - for (i=0; i < num_ranges; ++i) { - float fh = ranges[i].font_size; - float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh); - ranges[i].h_oversample = (unsigned char) spc->h_oversample; - ranges[i].v_oversample = (unsigned char) spc->v_oversample; - for (j=0; j < ranges[i].num_chars; ++j) { - int x0,y0,x1,y1; - int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j]; - int glyph = stbtt_FindGlyphIndex(info, codepoint); - if (glyph == 0 && (spc->skip_missing || missing_glyph_added)) { - rects[k].w = rects[k].h = 0; - } else { - stbtt_GetGlyphBitmapBoxSubpixel(info,glyph, - scale * spc->h_oversample, - scale * spc->v_oversample, - 0,0, - &x0,&y0,&x1,&y1); - rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1); - rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1); - if (glyph == 0) - missing_glyph_added = 1; - } - ++k; - } - } - - return k; -} - -STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int prefilter_x, int prefilter_y, float *sub_x, float *sub_y, int glyph) -{ - stbtt_MakeGlyphBitmapSubpixel(info, - output, - out_w - (prefilter_x - 1), - out_h - (prefilter_y - 1), - out_stride, - scale_x, - scale_y, - shift_x, - shift_y, - glyph); - - if (prefilter_x > 1) - stbtt__h_prefilter(output, out_w, out_h, out_stride, prefilter_x); - - if (prefilter_y > 1) - stbtt__v_prefilter(output, out_w, out_h, out_stride, prefilter_y); - - *sub_x = stbtt__oversample_shift(prefilter_x); - *sub_y = stbtt__oversample_shift(prefilter_y); -} - -// rects array must be big enough to accommodate all characters in the given ranges -STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects) -{ - int i,j,k, missing_glyph = -1, return_value = 1; - - // save current values - int old_h_over = spc->h_oversample; - int old_v_over = spc->v_oversample; - - k = 0; - for (i=0; i < num_ranges; ++i) { - float fh = ranges[i].font_size; - float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh); - float recip_h,recip_v,sub_x,sub_y; - spc->h_oversample = ranges[i].h_oversample; - spc->v_oversample = ranges[i].v_oversample; - recip_h = 1.0f / spc->h_oversample; - recip_v = 1.0f / spc->v_oversample; - sub_x = stbtt__oversample_shift(spc->h_oversample); - sub_y = stbtt__oversample_shift(spc->v_oversample); - for (j=0; j < ranges[i].num_chars; ++j) { - stbrp_rect *r = &rects[k]; - if (r->was_packed && r->w != 0 && r->h != 0) { - stbtt_packedchar *bc = &ranges[i].chardata_for_range[j]; - int advance, lsb, x0,y0,x1,y1; - int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j]; - int glyph = stbtt_FindGlyphIndex(info, codepoint); - stbrp_coord pad = (stbrp_coord) spc->padding; - - // pad on left and top - r->x += pad; - r->y += pad; - r->w -= pad; - r->h -= pad; - stbtt_GetGlyphHMetrics(info, glyph, &advance, &lsb); - stbtt_GetGlyphBitmapBox(info, glyph, - scale * spc->h_oversample, - scale * spc->v_oversample, - &x0,&y0,&x1,&y1); - stbtt_MakeGlyphBitmapSubpixel(info, - spc->pixels + r->x + r->y*spc->stride_in_bytes, - r->w - spc->h_oversample+1, - r->h - spc->v_oversample+1, - spc->stride_in_bytes, - scale * spc->h_oversample, - scale * spc->v_oversample, - 0,0, - glyph); - - if (spc->h_oversample > 1) - stbtt__h_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes, - r->w, r->h, spc->stride_in_bytes, - spc->h_oversample); - - if (spc->v_oversample > 1) - stbtt__v_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes, - r->w, r->h, spc->stride_in_bytes, - spc->v_oversample); - - bc->x0 = (stbtt_int16) r->x; - bc->y0 = (stbtt_int16) r->y; - bc->x1 = (stbtt_int16) (r->x + r->w); - bc->y1 = (stbtt_int16) (r->y + r->h); - bc->xadvance = scale * advance; - bc->xoff = (float) x0 * recip_h + sub_x; - bc->yoff = (float) y0 * recip_v + sub_y; - bc->xoff2 = (x0 + r->w) * recip_h + sub_x; - bc->yoff2 = (y0 + r->h) * recip_v + sub_y; - - if (glyph == 0) - missing_glyph = j; - } else if (spc->skip_missing) { - return_value = 0; - } else if (r->was_packed && r->w == 0 && r->h == 0 && missing_glyph >= 0) { - ranges[i].chardata_for_range[j] = ranges[i].chardata_for_range[missing_glyph]; - } else { - return_value = 0; // if any fail, report failure - } - - ++k; - } - } - - // restore original values - spc->h_oversample = old_h_over; - spc->v_oversample = old_v_over; - - return return_value; -} - -STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects) -{ - stbrp_pack_rects((stbrp_context *) spc->pack_info, rects, num_rects); -} - -STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges) -{ - stbtt_fontinfo info; - int i,j,n, return_value = 1; - //stbrp_context *context = (stbrp_context *) spc->pack_info; - stbrp_rect *rects; - - // flag all characters as NOT packed - for (i=0; i < num_ranges; ++i) - for (j=0; j < ranges[i].num_chars; ++j) - ranges[i].chardata_for_range[j].x0 = - ranges[i].chardata_for_range[j].y0 = - ranges[i].chardata_for_range[j].x1 = - ranges[i].chardata_for_range[j].y1 = 0; - - n = 0; - for (i=0; i < num_ranges; ++i) - n += ranges[i].num_chars; - - rects = (stbrp_rect *) STBTT_malloc(sizeof(*rects) * n, spc->user_allocator_context); - if (rects == NULL) - return 0; - - info.userdata = spc->user_allocator_context; - stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index)); - - n = stbtt_PackFontRangesGatherRects(spc, &info, ranges, num_ranges, rects); - - stbtt_PackFontRangesPackRects(spc, rects, n); - - return_value = stbtt_PackFontRangesRenderIntoRects(spc, &info, ranges, num_ranges, rects); - - STBTT_free(rects, spc->user_allocator_context); - return return_value; -} - -STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size, - int first_unicode_codepoint_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range) -{ - stbtt_pack_range range; - range.first_unicode_codepoint_in_range = first_unicode_codepoint_in_range; - range.array_of_unicode_codepoints = NULL; - range.num_chars = num_chars_in_range; - range.chardata_for_range = chardata_for_range; - range.font_size = font_size; - return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1); -} - -STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap) -{ - int i_ascent, i_descent, i_lineGap; - float scale; - stbtt_fontinfo info; - stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata, index)); - scale = size > 0 ? stbtt_ScaleForPixelHeight(&info, size) : stbtt_ScaleForMappingEmToPixels(&info, -size); - stbtt_GetFontVMetrics(&info, &i_ascent, &i_descent, &i_lineGap); - *ascent = (float) i_ascent * scale; - *descent = (float) i_descent * scale; - *lineGap = (float) i_lineGap * scale; -} - -STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer) -{ - float ipw = 1.0f / pw, iph = 1.0f / ph; - const stbtt_packedchar *b = chardata + char_index; - - if (align_to_integer) { - float x = (float) STBTT_ifloor((*xpos + b->xoff) + 0.5f); - float y = (float) STBTT_ifloor((*ypos + b->yoff) + 0.5f); - q->x0 = x; - q->y0 = y; - q->x1 = x + b->xoff2 - b->xoff; - q->y1 = y + b->yoff2 - b->yoff; - } else { - q->x0 = *xpos + b->xoff; - q->y0 = *ypos + b->yoff; - q->x1 = *xpos + b->xoff2; - q->y1 = *ypos + b->yoff2; - } - - q->s0 = b->x0 * ipw; - q->t0 = b->y0 * iph; - q->s1 = b->x1 * ipw; - q->t1 = b->y1 * iph; - - *xpos += b->xadvance; -} - -////////////////////////////////////////////////////////////////////////////// -// -// sdf computation -// - -#define STBTT_min(a,b) ((a) < (b) ? (a) : (b)) -#define STBTT_max(a,b) ((a) < (b) ? (b) : (a)) - -static int stbtt__ray_intersect_bezier(float orig[2], float ray[2], float q0[2], float q1[2], float q2[2], float hits[2][2]) -{ - float q0perp = q0[1]*ray[0] - q0[0]*ray[1]; - float q1perp = q1[1]*ray[0] - q1[0]*ray[1]; - float q2perp = q2[1]*ray[0] - q2[0]*ray[1]; - float roperp = orig[1]*ray[0] - orig[0]*ray[1]; - - float a = q0perp - 2*q1perp + q2perp; - float b = q1perp - q0perp; - float c = q0perp - roperp; - - float s0 = 0., s1 = 0.; - int num_s = 0; - - if (a != 0.0) { - float discr = b*b - a*c; - if (discr > 0.0) { - float rcpna = -1 / a; - float d = (float) STBTT_sqrt(discr); - s0 = (b+d) * rcpna; - s1 = (b-d) * rcpna; - if (s0 >= 0.0 && s0 <= 1.0) - num_s = 1; - if (d > 0.0 && s1 >= 0.0 && s1 <= 1.0) { - if (num_s == 0) s0 = s1; - ++num_s; - } - } - } else { - // 2*b*s + c = 0 - // s = -c / (2*b) - s0 = c / (-2 * b); - if (s0 >= 0.0 && s0 <= 1.0) - num_s = 1; - } - - if (num_s == 0) - return 0; - else { - float rcp_len2 = 1 / (ray[0]*ray[0] + ray[1]*ray[1]); - float rayn_x = ray[0] * rcp_len2, rayn_y = ray[1] * rcp_len2; - - float q0d = q0[0]*rayn_x + q0[1]*rayn_y; - float q1d = q1[0]*rayn_x + q1[1]*rayn_y; - float q2d = q2[0]*rayn_x + q2[1]*rayn_y; - float rod = orig[0]*rayn_x + orig[1]*rayn_y; - - float q10d = q1d - q0d; - float q20d = q2d - q0d; - float q0rd = q0d - rod; - - hits[0][0] = q0rd + s0*(2.0f - 2.0f*s0)*q10d + s0*s0*q20d; - hits[0][1] = a*s0+b; - - if (num_s > 1) { - hits[1][0] = q0rd + s1*(2.0f - 2.0f*s1)*q10d + s1*s1*q20d; - hits[1][1] = a*s1+b; - return 2; - } else { - return 1; - } - } -} - -static int equal(float *a, float *b) -{ - return (a[0] == b[0] && a[1] == b[1]); -} - -static int stbtt__compute_crossings_x(float x, float y, int nverts, stbtt_vertex *verts) -{ - int i; - float orig[2], ray[2] = { 1, 0 }; - float y_frac; - int winding = 0; - - orig[0] = x; - orig[1] = y; - - // make sure y never passes through a vertex of the shape - y_frac = (float) STBTT_fmod(y, 1.0f); - if (y_frac < 0.01f) - y += 0.01f; - else if (y_frac > 0.99f) - y -= 0.01f; - orig[1] = y; - - // test a ray from (-infinity,y) to (x,y) - for (i=0; i < nverts; ++i) { - if (verts[i].type == STBTT_vline) { - int x0 = (int) verts[i-1].x, y0 = (int) verts[i-1].y; - int x1 = (int) verts[i ].x, y1 = (int) verts[i ].y; - if (y > STBTT_min(y0,y1) && y < STBTT_max(y0,y1) && x > STBTT_min(x0,x1)) { - float x_inter = (y - y0) / (y1 - y0) * (x1-x0) + x0; - if (x_inter < x) - winding += (y0 < y1) ? 1 : -1; - } - } - if (verts[i].type == STBTT_vcurve) { - int x0 = (int) verts[i-1].x , y0 = (int) verts[i-1].y ; - int x1 = (int) verts[i ].cx, y1 = (int) verts[i ].cy; - int x2 = (int) verts[i ].x , y2 = (int) verts[i ].y ; - int ax = STBTT_min(x0,STBTT_min(x1,x2)), ay = STBTT_min(y0,STBTT_min(y1,y2)); - int by = STBTT_max(y0,STBTT_max(y1,y2)); - if (y > ay && y < by && x > ax) { - float q0[2],q1[2],q2[2]; - float hits[2][2]; - q0[0] = (float)x0; - q0[1] = (float)y0; - q1[0] = (float)x1; - q1[1] = (float)y1; - q2[0] = (float)x2; - q2[1] = (float)y2; - if (equal(q0,q1) || equal(q1,q2)) { - x0 = (int)verts[i-1].x; - y0 = (int)verts[i-1].y; - x1 = (int)verts[i ].x; - y1 = (int)verts[i ].y; - if (y > STBTT_min(y0,y1) && y < STBTT_max(y0,y1) && x > STBTT_min(x0,x1)) { - float x_inter = (y - y0) / (y1 - y0) * (x1-x0) + x0; - if (x_inter < x) - winding += (y0 < y1) ? 1 : -1; - } - } else { - int num_hits = stbtt__ray_intersect_bezier(orig, ray, q0, q1, q2, hits); - if (num_hits >= 1) - if (hits[0][0] < 0) - winding += (hits[0][1] < 0 ? -1 : 1); - if (num_hits >= 2) - if (hits[1][0] < 0) - winding += (hits[1][1] < 0 ? -1 : 1); - } - } - } - } - return winding; -} - -static float stbtt__cuberoot( float x ) -{ - if (x<0) - return -(float) STBTT_pow(-x,1.0f/3.0f); - else - return (float) STBTT_pow( x,1.0f/3.0f); -} - -// x^3 + c*x^2 + b*x + a = 0 -static int stbtt__solve_cubic(float a, float b, float c, float* r) -{ - float s = -a / 3; - float p = b - a*a / 3; - float q = a * (2*a*a - 9*b) / 27 + c; - float p3 = p*p*p; - float d = q*q + 4*p3 / 27; - if (d >= 0) { - float z = (float) STBTT_sqrt(d); - float u = (-q + z) / 2; - float v = (-q - z) / 2; - u = stbtt__cuberoot(u); - v = stbtt__cuberoot(v); - r[0] = s + u + v; - return 1; - } else { - float u = (float) STBTT_sqrt(-p/3); - float v = (float) STBTT_acos(-STBTT_sqrt(-27/p3) * q / 2) / 3; // p3 must be negative, since d is negative - float m = (float) STBTT_cos(v); - float n = (float) STBTT_cos(v-3.141592/2)*1.732050808f; - r[0] = s + u * 2 * m; - r[1] = s - u * (m + n); - r[2] = s - u * (m - n); - - //STBTT_assert( STBTT_fabs(((r[0]+a)*r[0]+b)*r[0]+c) < 0.05f); // these asserts may not be safe at all scales, though they're in bezier t parameter units so maybe? - //STBTT_assert( STBTT_fabs(((r[1]+a)*r[1]+b)*r[1]+c) < 0.05f); - //STBTT_assert( STBTT_fabs(((r[2]+a)*r[2]+b)*r[2]+c) < 0.05f); - return 3; - } -} - -STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff) -{ - float scale_x = scale, scale_y = scale; - int ix0,iy0,ix1,iy1; - int w,h; - unsigned char *data; - - if (scale == 0) return NULL; - - stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale, scale, 0.0f,0.0f, &ix0,&iy0,&ix1,&iy1); - - // if empty, return NULL - if (ix0 == ix1 || iy0 == iy1) - return NULL; - - ix0 -= padding; - iy0 -= padding; - ix1 += padding; - iy1 += padding; - - w = (ix1 - ix0); - h = (iy1 - iy0); - - if (width ) *width = w; - if (height) *height = h; - if (xoff ) *xoff = ix0; - if (yoff ) *yoff = iy0; - - // invert for y-downwards bitmaps - scale_y = -scale_y; - - { - int x,y,i,j; - float *precompute; - stbtt_vertex *verts; - int num_verts = stbtt_GetGlyphShape(info, glyph, &verts); - data = (unsigned char *) STBTT_malloc(w * h, info->userdata); - precompute = (float *) STBTT_malloc(num_verts * sizeof(float), info->userdata); - - for (i=0,j=num_verts-1; i < num_verts; j=i++) { - if (verts[i].type == STBTT_vline) { - float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y; - float x1 = verts[j].x*scale_x, y1 = verts[j].y*scale_y; - float dist = (float) STBTT_sqrt((x1-x0)*(x1-x0) + (y1-y0)*(y1-y0)); - precompute[i] = (dist == 0) ? 0.0f : 1.0f / dist; - } else if (verts[i].type == STBTT_vcurve) { - float x2 = verts[j].x *scale_x, y2 = verts[j].y *scale_y; - float x1 = verts[i].cx*scale_x, y1 = verts[i].cy*scale_y; - float x0 = verts[i].x *scale_x, y0 = verts[i].y *scale_y; - float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2; - float len2 = bx*bx + by*by; - if (len2 != 0.0f) - precompute[i] = 1.0f / (bx*bx + by*by); - else - precompute[i] = 0.0f; - } else - precompute[i] = 0.0f; - } - - for (y=iy0; y < iy1; ++y) { - for (x=ix0; x < ix1; ++x) { - float val; - float min_dist = 999999.0f; - float sx = (float) x + 0.5f; - float sy = (float) y + 0.5f; - float x_gspace = (sx / scale_x); - float y_gspace = (sy / scale_y); - - int winding = stbtt__compute_crossings_x(x_gspace, y_gspace, num_verts, verts); // @OPTIMIZE: this could just be a rasterization, but needs to be line vs. non-tesselated curves so a new path - - for (i=0; i < num_verts; ++i) { - float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y; - - // check against every point here rather than inside line/curve primitives -- @TODO: wrong if multiple 'moves' in a row produce a garbage point, and given culling, probably more efficient to do within line/curve - float dist2 = (x0-sx)*(x0-sx) + (y0-sy)*(y0-sy); - if (dist2 < min_dist*min_dist) - min_dist = (float) STBTT_sqrt(dist2); - - if (verts[i].type == STBTT_vline) { - float x1 = verts[i-1].x*scale_x, y1 = verts[i-1].y*scale_y; - - // coarse culling against bbox - //if (sx > STBTT_min(x0,x1)-min_dist && sx < STBTT_max(x0,x1)+min_dist && - // sy > STBTT_min(y0,y1)-min_dist && sy < STBTT_max(y0,y1)+min_dist) - float dist = (float) STBTT_fabs((x1-x0)*(y0-sy) - (y1-y0)*(x0-sx)) * precompute[i]; - STBTT_assert(i != 0); - if (dist < min_dist) { - // check position along line - // x' = x0 + t*(x1-x0), y' = y0 + t*(y1-y0) - // minimize (x'-sx)*(x'-sx)+(y'-sy)*(y'-sy) - float dx = x1-x0, dy = y1-y0; - float px = x0-sx, py = y0-sy; - // minimize (px+t*dx)^2 + (py+t*dy)^2 = px*px + 2*px*dx*t + t^2*dx*dx + py*py + 2*py*dy*t + t^2*dy*dy - // derivative: 2*px*dx + 2*py*dy + (2*dx*dx+2*dy*dy)*t, set to 0 and solve - float t = -(px*dx + py*dy) / (dx*dx + dy*dy); - if (t >= 0.0f && t <= 1.0f) - min_dist = dist; - } - } else if (verts[i].type == STBTT_vcurve) { - float x2 = verts[i-1].x *scale_x, y2 = verts[i-1].y *scale_y; - float x1 = verts[i ].cx*scale_x, y1 = verts[i ].cy*scale_y; - float box_x0 = STBTT_min(STBTT_min(x0,x1),x2); - float box_y0 = STBTT_min(STBTT_min(y0,y1),y2); - float box_x1 = STBTT_max(STBTT_max(x0,x1),x2); - float box_y1 = STBTT_max(STBTT_max(y0,y1),y2); - // coarse culling against bbox to avoid computing cubic unnecessarily - if (sx > box_x0-min_dist && sx < box_x1+min_dist && sy > box_y0-min_dist && sy < box_y1+min_dist) { - int num=0; - float ax = x1-x0, ay = y1-y0; - float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2; - float mx = x0 - sx, my = y0 - sy; - float res[3],px,py,t,it; - float a_inv = precompute[i]; - if (a_inv == 0.0) { // if a_inv is 0, it's 2nd degree so use quadratic formula - float a = 3*(ax*bx + ay*by); - float b = 2*(ax*ax + ay*ay) + (mx*bx+my*by); - float c = mx*ax+my*ay; - if (a == 0.0) { // if a is 0, it's linear - if (b != 0.0) { - res[num++] = -c/b; - } - } else { - float discriminant = b*b - 4*a*c; - if (discriminant < 0) - num = 0; - else { - float root = (float) STBTT_sqrt(discriminant); - res[0] = (-b - root)/(2*a); - res[1] = (-b + root)/(2*a); - num = 2; // don't bother distinguishing 1-solution case, as code below will still work - } - } - } else { - float b = 3*(ax*bx + ay*by) * a_inv; // could precompute this as it doesn't depend on sample point - float c = (2*(ax*ax + ay*ay) + (mx*bx+my*by)) * a_inv; - float d = (mx*ax+my*ay) * a_inv; - num = stbtt__solve_cubic(b, c, d, res); - } - if (num >= 1 && res[0] >= 0.0f && res[0] <= 1.0f) { - t = res[0], it = 1.0f - t; - px = it*it*x0 + 2*t*it*x1 + t*t*x2; - py = it*it*y0 + 2*t*it*y1 + t*t*y2; - dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy); - if (dist2 < min_dist * min_dist) - min_dist = (float) STBTT_sqrt(dist2); - } - if (num >= 2 && res[1] >= 0.0f && res[1] <= 1.0f) { - t = res[1], it = 1.0f - t; - px = it*it*x0 + 2*t*it*x1 + t*t*x2; - py = it*it*y0 + 2*t*it*y1 + t*t*y2; - dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy); - if (dist2 < min_dist * min_dist) - min_dist = (float) STBTT_sqrt(dist2); - } - if (num >= 3 && res[2] >= 0.0f && res[2] <= 1.0f) { - t = res[2], it = 1.0f - t; - px = it*it*x0 + 2*t*it*x1 + t*t*x2; - py = it*it*y0 + 2*t*it*y1 + t*t*y2; - dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy); - if (dist2 < min_dist * min_dist) - min_dist = (float) STBTT_sqrt(dist2); - } - } - } - } - if (winding == 0) - min_dist = -min_dist; // if outside the shape, value is negative - val = onedge_value + pixel_dist_scale * min_dist; - if (val < 0) - val = 0; - else if (val > 255) - val = 255; - data[(y-iy0)*w+(x-ix0)] = (unsigned char) val; - } - } - STBTT_free(precompute, info->userdata); - STBTT_free(verts, info->userdata); - } - return data; -} - -STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff) -{ - return stbtt_GetGlyphSDF(info, scale, stbtt_FindGlyphIndex(info, codepoint), padding, onedge_value, pixel_dist_scale, width, height, xoff, yoff); -} - -STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata) -{ - STBTT_free(bitmap, userdata); -} - -////////////////////////////////////////////////////////////////////////////// -// -// font name matching -- recommended not to use this -// - -// check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string -static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(stbtt_uint8 *s1, stbtt_int32 len1, stbtt_uint8 *s2, stbtt_int32 len2) -{ - stbtt_int32 i=0; - - // convert utf16 to utf8 and compare the results while converting - while (len2) { - stbtt_uint16 ch = s2[0]*256 + s2[1]; - if (ch < 0x80) { - if (i >= len1) return -1; - if (s1[i++] != ch) return -1; - } else if (ch < 0x800) { - if (i+1 >= len1) return -1; - if (s1[i++] != 0xc0 + (ch >> 6)) return -1; - if (s1[i++] != 0x80 + (ch & 0x3f)) return -1; - } else if (ch >= 0xd800 && ch < 0xdc00) { - stbtt_uint32 c; - stbtt_uint16 ch2 = s2[2]*256 + s2[3]; - if (i+3 >= len1) return -1; - c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000; - if (s1[i++] != 0xf0 + (c >> 18)) return -1; - if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1; - if (s1[i++] != 0x80 + ((c >> 6) & 0x3f)) return -1; - if (s1[i++] != 0x80 + ((c ) & 0x3f)) return -1; - s2 += 2; // plus another 2 below - len2 -= 2; - } else if (ch >= 0xdc00 && ch < 0xe000) { - return -1; - } else { - if (i+2 >= len1) return -1; - if (s1[i++] != 0xe0 + (ch >> 12)) return -1; - if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1; - if (s1[i++] != 0x80 + ((ch ) & 0x3f)) return -1; - } - s2 += 2; - len2 -= 2; - } - return i; -} - -static int stbtt_CompareUTF8toUTF16_bigendian_internal(char *s1, int len1, char *s2, int len2) -{ - return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((stbtt_uint8*) s1, len1, (stbtt_uint8*) s2, len2); -} - -// returns results in whatever encoding you request... but note that 2-byte encodings -// will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare -STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID) -{ - stbtt_int32 i,count,stringOffset; - stbtt_uint8 *fc = font->data; - stbtt_uint32 offset = font->fontstart; - stbtt_uint32 nm = stbtt__find_table(fc, offset, "name"); - if (!nm) return NULL; - - count = ttUSHORT(fc+nm+2); - stringOffset = nm + ttUSHORT(fc+nm+4); - for (i=0; i < count; ++i) { - stbtt_uint32 loc = nm + 6 + 12 * i; - if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2) - && languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) { - *length = ttUSHORT(fc+loc+8); - return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10)); - } - } - return NULL; -} - -static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id) -{ - stbtt_int32 i; - stbtt_int32 count = ttUSHORT(fc+nm+2); - stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4); - - for (i=0; i < count; ++i) { - stbtt_uint32 loc = nm + 6 + 12 * i; - stbtt_int32 id = ttUSHORT(fc+loc+6); - if (id == target_id) { - // find the encoding - stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4); - - // is this a Unicode encoding? - if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) { - stbtt_int32 slen = ttUSHORT(fc+loc+8); - stbtt_int32 off = ttUSHORT(fc+loc+10); - - // check if there's a prefix match - stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen); - if (matchlen >= 0) { - // check for target_id+1 immediately following, with same encoding & language - if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) { - slen = ttUSHORT(fc+loc+12+8); - off = ttUSHORT(fc+loc+12+10); - if (slen == 0) { - if (matchlen == nlen) - return 1; - } else if (matchlen < nlen && name[matchlen] == ' ') { - ++matchlen; - if (stbtt_CompareUTF8toUTF16_bigendian_internal((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen)) - return 1; - } - } else { - // if nothing immediately following - if (matchlen == nlen) - return 1; - } - } - } - - // @TODO handle other encodings - } - } - return 0; -} - -static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags) -{ - stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name); - stbtt_uint32 nm,hd; - if (!stbtt__isfont(fc+offset)) return 0; - - // check italics/bold/underline flags in macStyle... - if (flags) { - hd = stbtt__find_table(fc, offset, "head"); - if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0; - } - - nm = stbtt__find_table(fc, offset, "name"); - if (!nm) return 0; - - if (flags) { - // if we checked the macStyle flags, then just check the family and ignore the subfamily - if (stbtt__matchpair(fc, nm, name, nlen, 16, -1)) return 1; - if (stbtt__matchpair(fc, nm, name, nlen, 1, -1)) return 1; - if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1; - } else { - if (stbtt__matchpair(fc, nm, name, nlen, 16, 17)) return 1; - if (stbtt__matchpair(fc, nm, name, nlen, 1, 2)) return 1; - if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1; - } - - return 0; -} - -static int stbtt_FindMatchingFont_internal(unsigned char *font_collection, char *name_utf8, stbtt_int32 flags) -{ - stbtt_int32 i; - for (i=0;;++i) { - stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i); - if (off < 0) return off; - if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags)) - return off; - } -} - -#if defined(__GNUC__) || defined(__clang__) -#pragma GCC diagnostic push -#pragma GCC diagnostic ignored "-Wcast-qual" -#endif - -STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, - float pixel_height, unsigned char *pixels, int pw, int ph, - int first_char, int num_chars, stbtt_bakedchar *chardata) -{ - return stbtt_BakeFontBitmap_internal((unsigned char *) data, offset, pixel_height, pixels, pw, ph, first_char, num_chars, chardata); -} - -STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index) -{ - return stbtt_GetFontOffsetForIndex_internal((unsigned char *) data, index); -} - -STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data) -{ - return stbtt_GetNumberOfFonts_internal((unsigned char *) data); -} - -STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset) -{ - return stbtt_InitFont_internal(info, (unsigned char *) data, offset); -} - -STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags) -{ - return stbtt_FindMatchingFont_internal((unsigned char *) fontdata, (char *) name, flags); -} - -STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2) -{ - return stbtt_CompareUTF8toUTF16_bigendian_internal((char *) s1, len1, (char *) s2, len2); -} - -#if defined(__GNUC__) || defined(__clang__) -#pragma GCC diagnostic pop -#endif - -#endif // STB_TRUETYPE_IMPLEMENTATION - - -// FULL VERSION HISTORY -// -// 1.19 (2018-02-11) OpenType GPOS kerning (horizontal only), STBTT_fmod -// 1.18 (2018-01-29) add missing function -// 1.17 (2017-07-23) make more arguments const; doc fix -// 1.16 (2017-07-12) SDF support -// 1.15 (2017-03-03) make more arguments const -// 1.14 (2017-01-16) num-fonts-in-TTC function -// 1.13 (2017-01-02) support OpenType fonts, certain Apple fonts -// 1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual -// 1.11 (2016-04-02) fix unused-variable warning -// 1.10 (2016-04-02) allow user-defined fabs() replacement -// fix memory leak if fontsize=0.0 -// fix warning from duplicate typedef -// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use alloc userdata for PackFontRanges -// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges -// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints; -// allow PackFontRanges to pack and render in separate phases; -// fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?); -// fixed an assert() bug in the new rasterizer -// replace assert() with STBTT_assert() in new rasterizer -// 1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine) -// also more precise AA rasterizer, except if shapes overlap -// remove need for STBTT_sort -// 1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC -// 1.04 (2015-04-15) typo in example -// 1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes -// 1.02 (2014-12-10) fix various warnings & compile issues w/ stb_rect_pack, C++ -// 1.01 (2014-12-08) fix subpixel position when oversampling to exactly match -// non-oversampled; STBTT_POINT_SIZE for packed case only -// 1.00 (2014-12-06) add new PackBegin etc. API, w/ support for oversampling -// 0.99 (2014-09-18) fix multiple bugs with subpixel rendering (ryg) -// 0.9 (2014-08-07) support certain mac/iOS fonts without an MS platformID -// 0.8b (2014-07-07) fix a warning -// 0.8 (2014-05-25) fix a few more warnings -// 0.7 (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back -// 0.6c (2012-07-24) improve documentation -// 0.6b (2012-07-20) fix a few more warnings -// 0.6 (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels, -// stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty -// 0.5 (2011-12-09) bugfixes: -// subpixel glyph renderer computed wrong bounding box -// first vertex of shape can be off-curve (FreeSans) -// 0.4b (2011-12-03) fixed an error in the font baking example -// 0.4 (2011-12-01) kerning, subpixel rendering (tor) -// bugfixes for: -// codepoint-to-glyph conversion using table fmt=12 -// codepoint-to-glyph conversion using table fmt=4 -// stbtt_GetBakedQuad with non-square texture (Zer) -// updated Hello World! sample to use kerning and subpixel -// fixed some warnings -// 0.3 (2009-06-24) cmap fmt=12, compound shapes (MM) -// userdata, malloc-from-userdata, non-zero fill (stb) -// 0.2 (2009-03-11) Fix unsigned/signed char warnings -// 0.1 (2009-03-09) First public release -// - -/* ------------------------------------------------------------------------------- -This software is available under 2 licenses -- choose whichever you prefer. ------------------------------------------------------------------------------- -ALTERNATIVE A - MIT License -Copyright (c) 2017 Sean Barrett -Permission is hereby granted, free of charge, to any person obtaining a copy of -this software and associated documentation files (the "Software"), to deal in -the Software without restriction, including without limitation the rights to -use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies -of the Software, and to permit persons to whom the Software is furnished to do -so, subject to the following conditions: -The above copyright notice and this permission notice shall be included in all -copies or substantial portions of the Software. -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER -LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, -OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE -SOFTWARE. ------------------------------------------------------------------------------- -ALTERNATIVE B - Public Domain (www.unlicense.org) -This is free and unencumbered software released into the public domain. -Anyone is free to copy, modify, publish, use, compile, sell, or distribute this -software, either in source code form or as a compiled binary, for any purpose, -commercial or non-commercial, and by any means. -In jurisdictions that recognize copyright laws, the author or authors of this -software dedicate any and all copyright interest in the software to the public -domain. We make this dedication for the benefit of the public at large and to -the detriment of our heirs and successors. We intend this dedication to be an -overt act of relinquishment in perpetuity of all present and future rights to -this software under copyright law. -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN -ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION -WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ------------------------------------------------------------------------------- -*/