[WebRTC] A real ScreenCapturer test

webrtc/modules/desktop_capture/screen_drawer_win.cc

Index: webrtc/modules/desktop_capture/screen_drawer_win.cc
diff --git a/webrtc/modules/desktop_capture/screen_drawer_win.cc b/webrtc/modules/desktop_capture/screen_drawer_win.cc
index 061a40539e1cb72091347bf1b743b2315982e99c..2b1a7cfdf7f09f99208da4c9cd127991d831b8aa 100644
--- a/webrtc/modules/desktop_capture/screen_drawer_win.cc
+++ b/webrtc/modules/desktop_capture/screen_drawer_win.cc
@@ -13,6 +13,7 @@
 #include <memory>
 
 #include "webrtc/modules/desktop_capture/screen_drawer.h"
+#include "webrtc/system_wrappers/include/sleep.h"
 
 namespace webrtc {
 
@@ -34,6 +35,14 @@ HWND CreateDrawerWindow(DesktopRect rect) {
   return hwnd;
 }
 
+COLORREF ColorToRef(uint32_t bgra) {
+  int b = (bgra & 0xff000000) >> 24;
+  int g = (bgra & 0xff0000) >> 16;
+  int r = (bgra & 0xff00) >> 8;
+  // Windows device context does not support Alpha.
+  return RGB(r, g, b);
+}
+
 // A ScreenDrawer implementation for Windows.
 class ScreenDrawerWin : public ScreenDrawer {
  public:
@@ -42,10 +51,16 @@ class ScreenDrawerWin : public ScreenDrawer {
 
   // ScreenDrawer interface.
   DesktopRect DrawableRegion() override;
-  void DrawRectangle(DesktopRect rect, uint32_t rgba) override;
-  void Clear() override;
+  void DrawRectangle(DesktopRect rect, uint32_t bgra) override;
+  void WaitForPendingPaintings() override;
 
  private:
+  // Draw a line with |bgra| color.
+  void DrawLine(DesktopVector start, DesktopVector end, uint32_t bgra);
+
+  // Draw a dot with |bgra| color.
+  void DrawDot(DesktopVector vect, uint32_t bgra);
+
   const DesktopRect rect_;
   HWND window_;
   HDC hdc_;
@@ -57,8 +72,12 @@ ScreenDrawerWin::ScreenDrawerWin()
       window_(CreateDrawerWindow(rect_)),
       hdc_(GetWindowDC(window_)) {
   // We do not need to handle any messages for the |window_|, so disable Windows
-  // process windows ghosting feature.
+  // from processing windows ghosting feature.
   DisableProcessWindowsGhosting();
+
+  // Always use stock pen (DC_PEN) and brush (DC_BRUSH).
+  SelectObject(hdc_, GetStockObject(DC_PEN));
+  SelectObject(hdc_, GetStockObject(DC_BRUSH));
 }
 
 ScreenDrawerWin::~ScreenDrawerWin() {
@@ -71,20 +90,44 @@ DesktopRect ScreenDrawerWin::DrawableRegion() {
   return rect_;
 }
 
-void ScreenDrawerWin::DrawRectangle(DesktopRect rect, uint32_t rgba) {
-  int r = (rgba & 0xff00) >> 8;
-  int g = (rgba & 0xff0000) >> 16;
-  int b = (rgba & 0xff000000) >> 24;
-  // Windows device context does not support Alpha.
-  SelectObject(hdc_, GetStockObject(DC_PEN));
-  SelectObject(hdc_, GetStockObject(DC_BRUSH));
-  SetDCBrushColor(hdc_, RGB(r, g, b));
-  SetDCPenColor(hdc_, RGB(r, g, b));
+void ScreenDrawerWin::DrawRectangle(DesktopRect rect, uint32_t bgra) {
+  if (rect.width() == 1 && rect.height() == 1) {
+    // Rectangle function cannot draw a 1 pixel rectangle.
+    DrawDot(rect.top_left(), bgra);
+    return;
+  }
+
+  if (rect.width() == 1 || rect.height() == 1) {
+    // Rectangle function cannot draw a 1 pixel rectangle.
+    DrawLine(rect.top_left(), DesktopVector(rect.right(), rect.bottom()), bgra);
+    return;
+  }
+
+  SetDCBrushColor(hdc_, ColorToRef(bgra));
+  SetDCPenColor(hdc_, ColorToRef(bgra));
   Rectangle(hdc_, rect.left(), rect.top(), rect.right(), rect.bottom());
 }
 
-void ScreenDrawerWin::Clear() {
-  DrawRectangle(DrawableRegion(), 0);
+// TODO(zijiehe): Find the right signal to indicate the finish of all pending
+// paintings.
+void ScreenDrawerWin::WaitForPendingPaintings() {
+  SleepMs(500);
+}
+
+void ScreenDrawerWin::DrawLine(DesktopVector start,
+                               DesktopVector end,
+                               uint32_t bgra) {
+  POINT points[2];
+  points[0].x = start.x();
+  points[0].y = start.y();
+  points[1].x = end.x();
+  points[1].y = end.y();
+  SetDCPenColor(hdc_, ColorToRef(bgra));
+  Polyline(hdc_, points, 2);
+}
+
+void ScreenDrawerWin::DrawDot(DesktopVector vect, uint32_t bgra) {
+  SetPixel(hdc_, vect.x(), vect.y(), ColorToRef(bgra));
 }
 
 }  // namespace