screen_capturer_win_gdi.h

Enable keyboard shortcuts

/*

 *  Copyright (c) 2014 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_SCREEN_CAPTURER_WIN_GDI_H_

#define MODULES_DESKTOP_CAPTURE_WIN_SCREEN_CAPTURER_WIN_GDI_H_

#include <windows.h>

#include <memory>

#include "modules/desktop_capture/desktop_capturer.h"

#include "modules/desktop_capture/screen_capture_frame_queue.h"

#include "modules/desktop_capture/shared_desktop_frame.h"

#include "modules/desktop_capture/win/display_configuration_monitor.h"

#include "modules/desktop_capture/win/scoped_thread_desktop.h"

namespace webrtc {

// ScreenCapturerWinGdi captures 32bit RGB using GDI.

//

// ScreenCapturerWinGdi is double-buffered as required by ScreenCapturer.

// This class does not detect DesktopFrame::updated_region(), the field is

// always set to the entire frame rectangle. ScreenCapturerDifferWrapper should

// be used if that functionality is necessary.

class ScreenCapturerWinGdi : public DesktopCapturer {

 public:

  explicit ScreenCapturerWinGdi(const DesktopCaptureOptions& options);

  ~ScreenCapturerWinGdi() override;

  ScreenCapturerWinGdi(const ScreenCapturerWinGdi&) = delete;

  ScreenCapturerWinGdi& operator=(const ScreenCapturerWinGdi&) = delete;

  // Overridden from ScreenCapturer:

  void Start(Callback* callback) override;

  void SetSharedMemoryFactory(

      std::unique_ptr<SharedMemoryFactory> shared_memory_factory) override;

  void CaptureFrame() override;

  bool GetSourceList(SourceList* sources) override;

  bool SelectSource(SourceId id) override;

 private:

  typedef HRESULT(WINAPI* DwmEnableCompositionFunc)(UINT);

  // Make sure that the device contexts match the screen configuration.

  void PrepareCaptureResources();

  // Captures the current screen contents into the current buffer. Returns true

  // if succeeded.

  bool CaptureImage();

  // Capture the current cursor shape.

  void CaptureCursor();

  Callback* callback_ = nullptr;

  std::unique_ptr<SharedMemoryFactory> shared_memory_factory_;

  SourceId current_screen_id_ = kFullDesktopScreenId;

  std::wstring current_device_key_;

  ScopedThreadDesktop desktop_;

  // GDI resources used for screen capture.

  HDC desktop_dc_ = NULL;

  HDC memory_dc_ = NULL;

  // Queue of the frames buffers.

  ScreenCaptureFrameQueue<SharedDesktopFrame> queue_;

  DisplayConfigurationMonitor display_configuration_monitor_;

  HMODULE dwmapi_library_ = NULL;

  DwmEnableCompositionFunc composition_func_ = nullptr;

};

}  // namespace webrtc

#endif  // MODULES_DESKTOP_CAPTURE_WIN_SCREEN_CAPTURER_WIN_GDI_H_