PyQt demo app (#21625)

* build python helpers lib

* call setMainWindow from python

* put in helper lib

* linter

* move to scripts

scripts/pyqt_demo.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+
+from PyQt5.QtWidgets import QApplication, QLabel  # pylint: disable=no-name-in-module, import-error
+from selfdrive.ui.qt.python_helpers import set_main_window
+
+
+if __name__ == "__main__":
+  app = QApplication([])
+  label = QLabel('Hello World!')
+
+  # Set full screen and rotate
+  set_main_window(label)
+
+  app.exec_()

selfdrive/ui/SConscript

@@ -22,7 +22,7 @@ widgets_src = ["qt/util.cc", "qt/widgets/input.cc", "qt/widgets/drive_stats.cc",
                "qt/widgets/ssh_keys.cc", "qt/widgets/toggle.cc", "qt/widgets/controls.cc",
                "qt/widgets/offroad_alerts.cc", "qt/widgets/prime.cc", "qt/widgets/keyboard.cc",
                "qt/widgets/scrollview.cc", "qt/widgets/cameraview.cc", "#third_party/qrcode/QrCode.cc", "qt/api.cc",
-               "qt/request_repeater.cc"]
+               "qt/request_repeater.cc", "qt/qt_window.cc"]
 
 if arch != 'aarch64':
   widgets_src += ["qt/offroad/networking.cc", "qt/offroad/wifiManager.cc"]
@@ -48,6 +48,8 @@ qt_env.Program("_soundd", "soundd.cc", LIBS=base_libs)
 if GetOption('test'):
   qt_env.Program("tests/playsound", "tests/playsound.cc", LIBS=base_libs)
 
+qt_env.SharedLibrary("qt/python_helpers", ["qt/qt_window.cc"], LIBS=qt_libs)
+
 # spinner and text window
 qt_env.Program("qt/text", ["qt/text.cc"], LIBS=qt_libs)
 qt_env.Program("qt/spinner", ["qt/spinner.cc"], LIBS=qt_libs)

selfdrive/ui/qt/python_helpers.py

@@ -0,0 +1,21 @@
+
+import os
+from cffi import FFI
+
+import sip  # pylint: disable=import-error
+
+from common.ffi_wrapper import suffix
+from common.basedir import BASEDIR
+
+
+def get_ffi():
+  lib = os.path.join(BASEDIR, "selfdrive", "ui", "qt", "libpython_helpers" + suffix())
+
+  ffi = FFI()
+  ffi.cdef("void set_main_window(void *w);")
+  return ffi, ffi.dlopen(lib)
+
+
+def set_main_window(widget):
+  ffi, lib = get_ffi()
+  lib.set_main_window(ffi.cast('void*', sip.unwrapinstance(widget)))

selfdrive/ui/qt/qt_window.cc

@@ -0,0 +1,25 @@
+#include "selfdrive/ui/qt/qt_window.h"
+
+void setMainWindow(QWidget *w) {
+  const bool wide = (QGuiApplication::primaryScreen()->size().width() >= WIDE_WIDTH) ^
+                    (getenv("INVERT_WIDTH") != NULL);
+  const float scale = util::getenv("SCALE", 1.0f);
+
+  w->setFixedSize(QSize(wide ? WIDE_WIDTH : 1920, 1080) * scale);
+  w->show();
+
+#ifdef QCOM2
+  QPlatformNativeInterface *native = QGuiApplication::platformNativeInterface();
+  wl_surface *s = reinterpret_cast<wl_surface*>(native->nativeResourceForWindow("surface", w->windowHandle()));
+  wl_surface_set_buffer_transform(s, WL_OUTPUT_TRANSFORM_270);
+  wl_surface_commit(s);
+  w->showFullScreen();
+#endif
+}
+
+
+extern "C" {
+  void set_main_window(void *w) {
+    setMainWindow((QWidget*)w);
+  }
+}

selfdrive/ui/qt/qt_window.h

@@ -18,19 +18,4 @@ const QString ASSET_PATH = ":/";
 
 const int WIDE_WIDTH = 2160;
 
-inline void setMainWindow(QWidget *w) {
-  const bool wide = (QGuiApplication::primaryScreen()->size().width() >= WIDE_WIDTH) ^
-                    (getenv("INVERT_WIDTH") != NULL);
-  const float scale = util::getenv("SCALE", 1.0f);
-
-  w->setFixedSize(QSize(wide ? WIDE_WIDTH : 1920, 1080) * scale);
-  w->show();
-
-#ifdef QCOM2
-  QPlatformNativeInterface *native = QGuiApplication::platformNativeInterface();
-  wl_surface *s = reinterpret_cast<wl_surface*>(native->nativeResourceForWindow("surface", w->windowHandle()));
-  wl_surface_set_buffer_transform(s, WL_OUTPUT_TRANSFORM_270);
-  wl_surface_commit(s);
-  w->showFullScreen();
-#endif
-}
+void setMainWindow(QWidget *w);