[DesktopCapture] Detect screen resolution changes in DirectX capturer

webrtc/modules/desktop_capture/win/dxgi_texture.cc

 /*
  *  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.
  */
 
 #include "webrtc/modules/desktop_capture/win/dxgi_texture.h"
 
+#include <comdef.h>
+#include <wrl/client.h>
+#include <D3D11.h>
+
+#include "webrtc/base/checks.h"
 #include "webrtc/modules/desktop_capture/desktop_region.h"
+#include "webrtc/system_wrappers/include/logging.h"
+
+using Microsoft::WRL::ComPtr;
 
 namespace webrtc {
 
 namespace {
 
 class DxgiDesktopFrame : public DesktopFrame {
  public:
   explicit DxgiDesktopFrame(const DxgiTexture& texture)
       : DesktopFrame(texture.desktop_size(),
                      texture.pitch(),
                      texture.bits(),
                      nullptr) {}
 
   ~DxgiDesktopFrame() override = default;
 };
 
 }  // namespace
 
-DxgiTexture::DxgiTexture(const DesktopSize& desktop_size)
-    : desktop_size_(desktop_size) {}
+DxgiTexture::DxgiTexture() = default;
+DxgiTexture::~DxgiTexture() = default;
 
-DxgiTexture::~DxgiTexture() {}
+bool DxgiTexture::CopyFrom(const DXGI_OUTDUPL_FRAME_INFO& frame_info,
+                           IDXGIResource* resource) {
+  RTC_DCHECK(resource && frame_info.AccumulatedFrames > 0);
+  ComPtr<ID3D11Texture2D> texture;
+  _com_error error = resource->QueryInterface(
+      __uuidof(ID3D11Texture2D),
+      reinterpret_cast<void**>(texture.GetAddressOf()));
+  if (error.Error() != S_OK || !texture) {
+    LOG(LS_ERROR) << "Failed to convert IDXGIResource to ID3D11Texture2D, "
+                     "error "
+                  << error.ErrorMessage() << ", code " << error.Error();
+    return false;
+  }
+
+  D3D11_TEXTURE2D_DESC desc = {0};
+  texture->GetDesc(&desc);
+  desktop_size_.set(desc.Width, desc.Height);
+  if (resolution_change_detector_.IsChanged(desktop_size_)) {
+    LOG(LS_ERROR) << "Texture size is not consistent with current DxgiTexture.";
+    return false;
+  }
+
+  return CopyFromTexture(frame_info, texture.Get());
+}
 
 const DesktopFrame& DxgiTexture::AsDesktopFrame() {
   if (!frame_) {
     frame_.reset(new DxgiDesktopFrame(*this));
   }
   return *frame_;
 }
 
 bool DxgiTexture::Release() {
   frame_.reset();
   return DoRelease();
 }
 
+DXGI_MAPPED_RECT* DxgiTexture::rect() {
+  return &rect_;
+}
+
 }  // namespace webrtc