DirectX based screen capturer logic

webrtc/modules/desktop_capture/desktop_frame_win.h

Index: webrtc/modules/desktop_capture/desktop_frame_win.h
diff --git a/webrtc/modules/desktop_capture/desktop_frame_win.h b/webrtc/modules/desktop_capture/desktop_frame_win.h
index 929d23c0e56af6fcef478aadf62877ab64f9b150..028c5890a0e519e1ea5e75e6f857e11838770f28 100644
--- a/webrtc/modules/desktop_capture/desktop_frame_win.h
+++ b/webrtc/modules/desktop_capture/desktop_frame_win.h
@@ -13,7 +13,9 @@
 
 #include <memory>
 
+#include <DXGI.h>
 #include <windows.h>
+#include <wrl/client.h>
 
 #include "webrtc/modules/desktop_capture/desktop_frame.h"
 #include "webrtc/typedefs.h"
@@ -44,6 +46,24 @@ class DesktopFrameWin : public DesktopFrame {
   RTC_DISALLOW_COPY_AND_ASSIGN(DesktopFrameWin);
 };
 
+// DesktopFrame implementation used by screen captures on Windows.
+// Frame data is stored in a IDXGISurface instance.
+class DesktopFrameWinDXGI : public DesktopFrame {

[Sergey Ulanov, 2016/03/31 18:41:15]

Put this to a separate file (in win directory)? It doesn't need to be in the
same file with DesktopFrameWin.

[Sergey Ulanov, 2016/03/31 18:41:15]

Call this DesktopFrameWinDxgi. Style guide is not prescriptive about
abbreviations in names like this, but it gives UrlTable and not URLTable as an
example of a good class name.

[Hzj_jie, 2016/04/05 23:15:17]

Done.

[Hzj_jie, 2016/04/05 23:15:17]

Done.

+ public:
+  virtual ~DesktopFrameWinDXGI();
+  DesktopFrameWinDXGI(DesktopSize size,
+                      Microsoft::WRL::ComPtr<IDXGISurface> surface,
+                      DXGI_MAPPED_RECT rect);
+
+  // Create a valid but empty DesktopFrame, no updated regions.
+  DesktopFrameWinDXGI(DesktopSize size);

[Sergey Ulanov, 2016/03/31 18:41:15]

Do you need this constructor? You could also use BasicDesktopFrame when you need
to create an empty DesktopFrame, but that won't be the right thing to do. See my
comments in screen_capturer_win_directx.cc

[Hzj_jie, 2016/04/05 23:15:17]

Done.

+
+ private:
+  // Make sure IDXGISurface won't be recycled during the lifetime of this
+  // instance.
+  Microsoft::WRL::ComPtr<IDXGISurface> surface_;
+};

[Sergey Ulanov, 2016/03/31 18:41:15]

add RTC_DISALLOW_COPY_AND_ASSIGN()

[Hzj_jie, 2016/04/05 23:15:17]

Done.

+
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_WIN_H_