[Chromoting] Improve DirectX capturer to support multiple outputs

webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h

Index: webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
diff --git a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
index 169151975e04ab5a69c80380ce39fbfa1de596d6..4456951778e01f790e55958608b7108e25036374 100644
--- a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
+++ b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
@@ -13,23 +13,14 @@
 
 #include "webrtc/modules/desktop_capture/screen_capturer.h"
 
-#include <comdef.h>
-#include <D3DCommon.h>
-#include <D3D11.h>
-#include <DXGI.h>
-#include <DXGI1_2.h>
-#include <windows.h>
-#include <wrl/client.h>
-
 #include <memory>
 #include <vector>
 
-#include "webrtc/base/thread_annotations.h"
 #include "webrtc/modules/desktop_capture/desktop_capture_options.h"
-#include "webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "webrtc/modules/desktop_capture/desktop_region.h"
 #include "webrtc/modules/desktop_capture/screen_capture_frame_queue.h"
 #include "webrtc/modules/desktop_capture/shared_desktop_frame.h"
+#include "webrtc/modules/desktop_capture/win/dxgi_context.h"
 
 namespace webrtc {
 
@@ -37,10 +28,8 @@ namespace webrtc {
 // implementation won't work when ScreenCaptureFrameQueue.kQueueLength is not 2.
 class ScreenCapturerWinDirectx : public ScreenCapturer {
  public:
-  // Initializes DirectX related components. Returns false if any error
-  // happened, any instance of this class won't be able to work in such status.
-  // Thread safe, guarded by initialize_lock.
-  static bool Initialize();
+  // Whether the system support DirectX based capturing.
+  static bool IsSupported();
 
   explicit ScreenCapturerWinDirectx(const DesktopCaptureOptions& options);
   virtual ~ScreenCapturerWinDirectx();
@@ -53,48 +42,17 @@ class ScreenCapturerWinDirectx : public ScreenCapturer {
   bool SelectScreen(ScreenId id) override;
 
  private:
-  // Texture is a pair of an ID3D11Texture2D and an IDXGISurface. Refer to its
-  // implementation in source code for details.
-  class Texture;
-
-  // An implementation of DesktopFrame to return data from a Texture instance.
-  class DxgiDesktopFrame;
-
-  static bool DoInitialize();
-
-  // Initializes DxgiOutputDuplication. If current DxgiOutputDuplication
-  // instance is existing, this function takes no-op and returns true. Returns
-  // false if it fails to execute windows api.
-  static bool DuplicateOutput();
-
-  // Deprecates current DxgiOutputDuplication instance and calls DuplicateOutput
-  // to reinitialize it.
-  static bool ForceDuplicateOutput();
-
-  // Detects update regions in last frame, if anything wrong, returns false.
-  // ProcessFrame will insert a whole desktop size as updated region instead.
-  static bool DetectUpdatedRegion(const DXGI_OUTDUPL_FRAME_INFO& frame_info,
-                                  DesktopRegion* updated_region);
+  // Returns desktop size of selected screen.
+  DesktopSize SelectedDesktopSize() const;
 
-  // A helper function to handle _com_error result in DetectUpdatedRegion.
-  // Returns false if the _com_error shows an error.
-  static bool HandleDetectUpdatedRegionError(const _com_error& error,
-                                             const char* stage);
-
-  // Processes one frame received from AcquireNextFrame function, returns a
-  // nullptr if anything wrong.
-  std::unique_ptr<DesktopFrame> ProcessFrame(
-      const DXGI_OUTDUPL_FRAME_INFO& frame_info,
-      IDXGIResource* resource);
-
-  // A shortcut to execute callback with current frame in frames.
-  void EmitCurrentFrame();
-
-  ScreenCaptureFrameQueue<rtc::scoped_refptr<Texture>> surfaces_;
   ScreenCaptureFrameQueue<SharedDesktopFrame> frames_;
   std::unique_ptr<SharedMemoryFactory> shared_memory_factory_;
   Callback* callback_ = nullptr;
 
+  DxgiContext context_;
+
+  ScreenId current_screen_id = kFullDesktopScreenId;
+
   RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCapturerWinDirectx);
 };