[DesktopCapture] Detect screen resolution changes in DirectX capturer

webrtc/modules/desktop_capture/win/dxgi_texture.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_TEXTURE_H_
 #define WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_TEXTURE_H_
 
+#include <D3D11.h>
 #include <DXGI1_2.h>
 
 #include <memory>
 
 #include "webrtc/modules/desktop_capture/desktop_frame.h"
 #include "webrtc/modules/desktop_capture/desktop_geometry.h"
+#include "webrtc/modules/desktop_capture/resolution_change_detector.h"
 
 namespace webrtc {
 
 class DesktopRegion;
 
 // A texture copied or mapped from a DXGI_OUTDUPL_FRAME_INFO and IDXGIResource.
 class DxgiTexture {
  public:
   // Creates a DxgiTexture instance, which represents the |desktop_size| area of
   // entire screen -- usually a monitor on the system.
-  explicit DxgiTexture(const DesktopSize& desktop_size);
+  DxgiTexture();
 
   virtual ~DxgiTexture();
 
   // Copies selected regions of a frame represented by frame_info and resource.
   // Returns false if anything wrong.
-  virtual bool CopyFrom(const DXGI_OUTDUPL_FRAME_INFO& frame_info,
-                        IDXGIResource* resource) = 0;
+  bool CopyFrom(const DXGI_OUTDUPL_FRAME_INFO& frame_info,
+                IDXGIResource* resource);
 
   const DesktopSize& desktop_size() const { return desktop_size_; }
 
   uint8_t* bits() const { return static_cast<uint8_t*>(rect_.pBits); }
 
   int pitch() const { return static_cast<int>(rect_.Pitch); }
 
   // Releases the resource currently holds by this instance. Returns false if
   // anything wrong, and this instance should be deprecated in this state. bits,
   // pitch and AsDesktopFrame are only valid after a success CopyFrom() call,
   // but before Release() call.
   bool Release();
 
   // Returns a DesktopFrame snapshot of a DxgiTexture instance. This
   // DesktopFrame is used to copy a DxgiTexture content to another DesktopFrame
   // only. And it should not outlive its DxgiTexture instance.
   const DesktopFrame& AsDesktopFrame();
 
  protected:
-  DXGI_MAPPED_RECT rect_ = {0};
+  DXGI_MAPPED_RECT* rect();
+
+  virtual bool CopyFromTexture(const DXGI_OUTDUPL_FRAME_INFO& frame_info,
+                               ID3D11Texture2D* texture) = 0;
+
+  virtual bool DoRelease() = 0;
 
  private:
-  virtual bool DoRelease() = 0;
-
-  const DesktopSize desktop_size_;
+  DXGI_MAPPED_RECT rect_ = {0};
+  DesktopSize desktop_size_;
   std::unique_ptr<DesktopFrame> frame_;
+  ResolutionChangeDetector resolution_change_detector_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_TEXTURE_H_