You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 lines
2.4 KiB
55 lines
2.4 KiB
6 years ago
|
#define INTER_BITS 5
|
||
|
|
#define INTER_TAB_SIZE (1 << INTER_BITS)
|
||
|
|
#define INTER_SCALE 1.f / INTER_TAB_SIZE
|
||
|
|
|
||
|
|
#define INTER_REMAP_COEF_BITS 15
|
||
|
|
#define INTER_REMAP_COEF_SCALE (1 << INTER_REMAP_COEF_BITS)
|
||
|
|
|
||
|
|
__kernel void warpPerspective(__global const uchar * src,
|
||
|
|
int src_step, int src_offset, int src_rows, int src_cols,
|
||
|
|
__global uchar * dst,
|
||
|
|
int dst_step, int dst_offset, int dst_rows, int dst_cols,
|
||
|
|
__constant float * M)
|
||
|
|
{
|
||
|
|
int dx = get_global_id(0);
|
||
|
|
int dy = get_global_id(1);
|
||
|
|
|
||
|
|
if (dx < dst_cols && dy < dst_rows)
|
||
|
|
{
|
||
|
|
float X0 = M[0] * dx + M[1] * dy + M[2];
|
||
|
|
float Y0 = M[3] * dx + M[4] * dy + M[5];
|
||
|
|
float W = M[6] * dx + M[7] * dy + M[8];
|
||
|
|
W = W != 0.0f ? INTER_TAB_SIZE / W : 0.0f;
|
||
|
|
int X = rint(X0 * W), Y = rint(Y0 * W);
|
||
|
|
|
||
|
|
short sx = convert_short_sat(X >> INTER_BITS);
|
||
|
|
short sy = convert_short_sat(Y >> INTER_BITS);
|
||
|
|
short ay = (short)(Y & (INTER_TAB_SIZE - 1));
|
||
|
|
short ax = (short)(X & (INTER_TAB_SIZE - 1));
|
||
|
|
|
||
|
|
int v0 = (sx >= 0 && sx < src_cols && sy >= 0 && sy < src_rows) ?
|
||
|
|
convert_int(src[mad24(sy, src_step, src_offset + sx)]) : 0;
|
||
|
|
int v1 = (sx+1 >= 0 && sx+1 < src_cols && sy >= 0 && sy < src_rows) ?
|
||
|
|
convert_int(src[mad24(sy, src_step, src_offset + (sx+1))]) : 0;
|
||
|
|
int v2 = (sx >= 0 && sx < src_cols && sy+1 >= 0 && sy+1 < src_rows) ?
|
||
|
|
convert_int(src[mad24(sy+1, src_step, src_offset + sx)]) : 0;
|
||
|
|
int v3 = (sx+1 >= 0 && sx+1 < src_cols && sy+1 >= 0 && sy+1 < src_rows) ?
|
||
|
|
convert_int(src[mad24(sy+1, src_step, src_offset + (sx+1))]) : 0;
|
||
|
|
|
||
|
|
float taby = 1.f/INTER_TAB_SIZE*ay;
|
||
|
|
float tabx = 1.f/INTER_TAB_SIZE*ax;
|
||
|
|
|
||
|
|
int dst_index = mad24(dy, dst_step, dst_offset + dx);
|
||
|
|
|
||
|
|
int itab0 = convert_short_sat_rte( (1.0f-taby)*(1.0f-tabx) * INTER_REMAP_COEF_SCALE );
|
||
|
|
int itab1 = convert_short_sat_rte( (1.0f-taby)*tabx * INTER_REMAP_COEF_SCALE );
|
||
|
|
int itab2 = convert_short_sat_rte( taby*(1.0f-tabx) * INTER_REMAP_COEF_SCALE );
|
||
|
|
int itab3 = convert_short_sat_rte( taby*tabx * INTER_REMAP_COEF_SCALE );
|
||
|
|
|
||
|
|
int val = v0 * itab0 + v1 * itab1 + v2 * itab2 + v3 * itab3;
|
||
|
|
|
||
|
|
uchar pix = convert_uchar_sat((val + (1 << (INTER_REMAP_COEF_BITS-1))) >> INTER_REMAP_COEF_BITS);
|
||
|
|
dst[dst_index] = pix;
|
||
|
|
}
|
||
|
|
}
|