Revert of BlankDetectorDesktopCapturerWrapper to detect a blank DesktopFrame

webrtc/modules/desktop_capture/blank_detector_desktop_capturer_wrapper.h

-/*
- *  Copyright (c) 2017 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 WEBRTC_MODULES_DESKTOP_CAPTURE_BLANK_DETECTOR_DESKTOP_CAPTURER_WRAPPER_H_
-#define WEBRTC_MODULES_DESKTOP_CAPTURE_BLANK_DETECTOR_DESKTOP_CAPTURER_WRAPPER_H_
-
-#include <memory>
-
-#include "webrtc/modules/desktop_capture/desktop_capturer.h"
-#include "webrtc/modules/desktop_capture/rgba_color.h"
-
-namespace webrtc {
-
-// A DesktopCapturer wrapper detects the return value of its owned
-// DesktopCapturer implementation. If sampled pixels returned by the
-// DesktopCapturer implementation all equal to the blank pixel, this wrapper
-// returns ERROR_TEMPORARY. If the DesktopCapturer implementation fails for too
-// many times, this wrapper returns ERROR_PERMANENT.
-class BlankDetectorDesktopCapturerWrapper final
-    : public DesktopCapturer,
-      public DesktopCapturer::Callback {
- public:
-  // Creates BlankDetectorDesktopCapturerWrapper. BlankDesktopCapturerWrapper
-  // takes ownership of |capturer|. The |blank_pixel| is the unmodified color
-  // returned by the |capturer|.
-  BlankDetectorDesktopCapturerWrapper(std::unique_ptr<DesktopCapturer> capturer,
-                                      RgbaColor blank_pixel);
-  ~BlankDetectorDesktopCapturerWrapper() 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* sources) override;
-  bool SelectSource(SourceId id) override;
-  bool FocusOnSelectedSource() override;
-
- private:
-  // DesktopCapturer::Callback interface.
-  void OnCaptureResult(Result result,
-                       std::unique_ptr<DesktopFrame> frame) override;
-
-  bool IsBlankFrame(const DesktopFrame& frame) const;
-
-  // Detects whether pixel at (x, y) equals to |blank_pixel_|.
-  bool IsBlankPixel(const DesktopFrame& frame, int x, int y) const;
-
-  const std::unique_ptr<DesktopCapturer> capturer_;
-  const RgbaColor blank_pixel_;
-
-  // Whether a non-blank frame has been received.
-  bool non_blank_frame_received_ = false;
-
-  // Whether the last frame is blank.
-  bool last_frame_is_blank_ = false;
-
-  // Whether current frame is the first frame.
-  bool is_first_frame_ = true;
-
-  DesktopCapturer::Callback* callback_ = nullptr;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_BLANK_DETECTOR_DESKTOP_CAPTURER_WRAPPER_H_