[Chromoting] Improve DirectX capturer to support multiple outputs

webrtc/modules/desktop_capture/win/d3d_device.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 MODULES_DESKTOP_CAPTURE_WIN_D3D_DEVICE_H_
+#define MODULES_DESKTOP_CAPTURE_WIN_D3D_DEVICE_H_
+
+#include <comdef.h>
+#include <wrl/client.h>
+#include <D3D11.h>
+#include <DXGI.h>
+
+#include <vector>
+
+namespace webrtc {
+
+// A wrapper of ID3D11Device and its corresponding context and IDXGIAdapter.
+// This class represents one video card in the system.
+class D3dDevice {
+ public:
+  ~D3dDevice();  // = default

[Sergey Ulanov, 2016/08/06 01:27:56]

remove the comment?

[Hzj_jie, 2016/08/08 00:16:08]

Done.

+
+  ID3D11Device* d3d_device() const { return d3d_device_.Get(); }
+
+  ID3D11DeviceContext* context() const { return context_.Get(); }
+
+  IDXGIDevice* dxgi_device() const { return dxgi_device_.Get(); }
+
+  IDXGIAdapter* dxgi_adapter() const { return dxgi_adapter_.Get(); }
+
+  // Returns all D3dDevices on the system. Returns an empty vector if anything

[Sergey Ulanov, 2016/08/06 01:27:56]

s/D3dDevices/D3dDevice instances/
class names pluralized like this make this code harder to work this.  

[Hzj_jie, 2016/08/08 00:16:08]

Done.

+  // wrong.
+  static std::vector<D3dDevice> EnumDevices();
+
+ private:
+  // Instances of D3dDevice should only be created by EnumDevices() static
+  // function.
+  D3dDevice();  // = default

[Sergey Ulanov, 2016/08/06 01:27:56]

here as well

[Hzj_jie, 2016/08/08 00:16:08]

Done.

+
+  // Initialize the D3dDevice from an IDXGIAdapter.
+  bool Initialize(const Microsoft::WRL::ComPtr<IDXGIAdapter>& adapter);
+
+  Microsoft::WRL::ComPtr<ID3D11Device> d3d_device_;
+  Microsoft::WRL::ComPtr<ID3D11DeviceContext> context_;
+  Microsoft::WRL::ComPtr<IDXGIDevice> dxgi_device_;
+  Microsoft::WRL::ComPtr<IDXGIAdapter> dxgi_adapter_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_WIN_D3D_DEVICE_H_