Use FallbackDesktopCapturerWrapper in ScreenCapturerWinMagnifier

webrtc/modules/desktop_capture/win/screen_capturer_win_magnifier.h

 /*
  *  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.
  */
 
@@ skipping 22 matching lines @@
 // Captures the screen using the Magnification API to support window exclusion.
 // Each capturer must run on a dedicated thread because it uses thread local
 // storage for redirecting the library callback. Also the thread must have a UI
 // message loop to handle the window messages for the magnifier window.
 //
 // 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 ScreenCapturerWinMagnifier : public DesktopCapturer {
  public:
-  // |fallback_capturer| will be used to capture the screen if a non-primary
-  // screen is being captured, or the OS does not support Magnification API, or
-  // the magnifier capturer fails (e.g. in Windows8 Metro mode).
-  explicit ScreenCapturerWinMagnifier(
-      std::unique_ptr<DesktopCapturer> fallback_capturer);
+  ScreenCapturerWinMagnifier();
   ~ScreenCapturerWinMagnifier() override;
 
   // Overridden from ScreenCapturer:
   void Start(Callback* callback) override;
   void SetSharedMemoryFactory(
       std::unique_ptr<SharedMemoryFactory> shared_memory_factory) override;
   void CaptureFrame() override;
   bool GetSourceList(SourceList* screens) override;
   bool SelectSource(SourceId id) override;
   void SetExcludedWindow(WindowId window) override;
@@ skipping 38 matching lines @@
   // Helper method for setting up the magnifier control. Returns true if
   // succeeded.
   bool InitializeMagnifier();
 
   // Called by OnMagImageScalingCallback to output captured data.
   void OnCaptured(void* data, const MAGIMAGEHEADER& header);
 
   // Makes sure the current frame exists and matches |size|.
   void CreateCurrentFrameIfNecessary(const DesktopSize& size);
 
-  // Start the fallback capturer and select the screen.
-  void StartFallbackCapturer();
-
   static Atomic32 tls_index_;
 
-  std::unique_ptr<DesktopCapturer> fallback_capturer_;
-  bool fallback_capturer_started_ = false;
   Callback* callback_ = nullptr;
   std::unique_ptr<SharedMemoryFactory> shared_memory_factory_;
   ScreenId current_screen_id_ = kFullDesktopScreenId;
   std::wstring current_device_key_;
   HWND excluded_window_ = NULL;
 
   // Queue of the frames buffers.
   ScreenCaptureFrameQueue<SharedDesktopFrame> queue_;
 
   ScopedThreadDesktop desktop_;
@@ skipping 19 matching lines @@
   // True if the last OnMagImageScalingCallback was called and handled
   // successfully. Reset at the beginning of each CaptureImage call.
   bool magnifier_capture_succeeded_ = true;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCapturerWinMagnifier);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_SCREEN_CAPTURER_WIN_MAGNIFIER_H_