Remove differ from ScreenCapturer implementations

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 11 matching lines @@
 #include "webrtc/modules/desktop_capture/screen_capturer.h"
 #include "webrtc/modules/desktop_capture/screen_capturer_helper.h"
 #include "webrtc/modules/desktop_capture/shared_desktop_frame.h"
 #include "webrtc/modules/desktop_capture/win/scoped_thread_desktop.h"
 #include "webrtc/system_wrappers/include/atomic32.h"
 
 namespace webrtc {
 
 class DesktopFrame;
 class DesktopRect;
-class Differ;
 
 // 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 ScreenCapturer {
  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<ScreenCapturer> fallback_capturer);
   virtual ~ScreenCapturerWinMagnifier();
 
   // Overridden from ScreenCapturer:
@@ skipping 61 matching lines @@
   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_;
 
-  // Class to calculate the difference between two screen bitmaps.
-  std::unique_ptr<Differ> differ_;
-
   ScopedThreadDesktop desktop_;
 
   // Used for getting the screen dpi.
   HDC desktop_dc_ = NULL;
 
   HMODULE mag_lib_handle_ = NULL;
   MagInitializeFunc mag_initialize_func_ = nullptr;
   MagUninitializeFunc mag_uninitialize_func_ = nullptr;
   MagSetWindowSourceFunc set_window_source_func_ = nullptr;
   MagSetWindowFilterListFunc set_window_filter_list_func_ = nullptr;
@@ skipping 10 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_