[Chromoting] Improve DirectX capturer to support multiple outputs

webrtc/modules/desktop_capture/win/dxgi_texture_mapping.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_mapping.h"
+
+#include <comdef.h>
+#include <DXGI.h>
+#include <DXGI1_2.h>
+
+#include "webrtc/base/checks.h"
+#include "webrtc/system_wrappers/include/logging.h"
+
+namespace webrtc {
+
+DxgiTextureMapping::DxgiTextureMapping(const DesktopRect& desktop_rect,
+                                       IDXGIOutputDuplication* duplication)
+    : DxgiTexture(desktop_rect), duplication_(duplication) {
+  RTC_DCHECK(duplication_);
+}
+
+bool DxgiTextureMapping::CopyFrom(const DXGI_OUTDUPL_FRAME_INFO& frame_info,
+                                  IDXGIResource* resource,
+                                  const DesktopRegion& region) {
+  RTC_DCHECK(resource && frame_info.AccumulatedFrames > 0);
+  rect_ = {0};
+  _com_error error = duplication_->MapDesktopSurface(&rect_);
+  if (error.Error() != S_OK) {
+    rect_ = {0};
+    LOG(LS_ERROR) << "Failed to map the IDXGIOutputDuplication to a bitmap, "
+                     "error "
+                  << error.ErrorMessage() << ", code " << error.Error();
+    return false;
+  }
+
+  return true;
+}
+
+bool DxgiTextureMapping::DoRelease() {
+  _com_error error = duplication_->UnMapDesktopSurface();
+  if (error.Error() != S_OK) {
+    LOG(LS_ERROR) << "Failed to unmap the IDXGIOutputDuplication, error "
+                  << error.ErrorMessage() << ", code " << error.Error();
+    return false;
+  }
+  return true;
+}
+
+}  // namespace webrtc