1 /*
2  *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef MODULES_DESKTOP_CAPTURE_WIN_DISPLAY_CONFIGURATION_MONITOR_H_
12 #define MODULES_DESKTOP_CAPTURE_WIN_DISPLAY_CONFIGURATION_MONITOR_H_
13 
14 #include "modules/desktop_capture/desktop_geometry.h"
15 
16 namespace webrtc {
17 
18 // A passive monitor to detect the change of display configuration on a Windows
19 // system.
20 // TODO(zijiehe): Also check for pixel format changes.
21 class DisplayConfigurationMonitor {
22  public:
23   // Checks whether the change of display configuration has happened after last
24   // IsChanged() call. This function won't return true for the first time after
25   // constructor or Reset() call.
26   bool IsChanged();
27 
28   // Resets to the initial state.
29   void Reset();
30 
31  private:
32   DesktopRect rect_;
33   bool initialized_ = false;
34 };
35 
36 }  // namespace webrtc
37 
38 #endif  // MODULES_DESKTOP_CAPTURE_WIN_DISPLAY_CONFIGURATION_MONITOR_H_
39