desktop_capturer_differ_wrapper.h

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/*

 *  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_DESKTOP_CAPTURER_DIFFER_WRAPPER_H_

#define MODULES_DESKTOP_CAPTURE_DESKTOP_CAPTURER_DIFFER_WRAPPER_H_

#include <memory>

#if defined(WEBRTC_USE_GIO)

#include "modules/desktop_capture/desktop_capture_metadata.h"

#endif  // defined(WEBRTC_USE_GIO)

#include "modules/desktop_capture/desktop_capture_types.h"

#include "modules/desktop_capture/desktop_capturer.h"

#include "modules/desktop_capture/desktop_frame.h"

#include "modules/desktop_capture/desktop_geometry.h"

#include "modules/desktop_capture/shared_desktop_frame.h"

#include "modules/desktop_capture/shared_memory.h"

#include "rtc_base/system/rtc_export.h"

namespace webrtc {

// DesktopCapturer wrapper that calculates updated_region() by comparing frames

// content. This class always expects the underlying DesktopCapturer

// implementation returns a superset of updated regions in DestkopFrame. If a

// DesktopCapturer implementation does not know the updated region, it should

// set updated_region() to full frame.

//

// This class marks entire frame as updated if the frame size or frame stride

// has been changed.

class RTC_EXPORT DesktopCapturerDifferWrapper

    : public DesktopCapturer,

      public DesktopCapturer::Callback {

 public:

  // Creates a DesktopCapturerDifferWrapper with a DesktopCapturer

  // implementation, and takes its ownership.

  explicit DesktopCapturerDifferWrapper(

      std::unique_ptr<DesktopCapturer> base_capturer);

  ~DesktopCapturerDifferWrapper() override;

  // DesktopCapturer interface.

  void Start(DesktopCapturer::Callback* callback) override;

  void SetSharedMemoryFactory(

      std::unique_ptr<SharedMemoryFactory> shared_memory_factory) override;

  void CaptureFrame() override;

  void SetExcludedWindow(WindowId window) override;

  bool GetSourceList(SourceList* screens) override;

  bool SelectSource(SourceId id) override;

  bool FocusOnSelectedSource() override;

  bool IsOccluded(const DesktopVector& pos) override;

#if defined(WEBRTC_USE_GIO)

  DesktopCaptureMetadata GetMetadata() override;

#endif  // defined(WEBRTC_USE_GIO)

 private:

  // DesktopCapturer::Callback interface.

  void OnCaptureResult(Result result,

                       std::unique_ptr<DesktopFrame> frame) override;

  const std::unique_ptr<DesktopCapturer> base_capturer_;

  DesktopCapturer::Callback* callback_;

  std::unique_ptr<SharedDesktopFrame> last_frame_;

};

}  // namespace webrtc

#endif  // MODULES_DESKTOP_CAPTURE_DESKTOP_CAPTURER_DIFFER_WRAPPER_H_