1 /*
2  *  Copyright (c) 2014 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_MAC_DESKTOP_CONFIGURATION_MONITOR_H_
12 #define MODULES_DESKTOP_CAPTURE_MAC_DESKTOP_CONFIGURATION_MONITOR_H_
13 
14 #include <ApplicationServices/ApplicationServices.h>
15 
16 #include <memory>
17 #include <set>
18 
19 #include "api/ref_counted_base.h"
20 #include "modules/desktop_capture/mac/desktop_configuration.h"
21 #include "rtc_base/constructor_magic.h"
22 #include "rtc_base/synchronization/mutex.h"
23 
24 namespace webrtc {
25 
26 // The class provides functions to synchronize capturing and display
27 // reconfiguring across threads, and the up-to-date MacDesktopConfiguration.
28 class DesktopConfigurationMonitor : public rtc::RefCountedBase {
29  public:
30   DesktopConfigurationMonitor();
31   // Returns the current desktop configuration.
32   MacDesktopConfiguration desktop_configuration();
33 
34  protected:
35   ~DesktopConfigurationMonitor() override;
36 
37  private:
38   static void DisplaysReconfiguredCallback(CGDirectDisplayID display,
39                                            CGDisplayChangeSummaryFlags flags,
40                                            void* user_parameter);
41   void DisplaysReconfigured(CGDirectDisplayID display,
42                             CGDisplayChangeSummaryFlags flags);
43 
44   Mutex desktop_configuration_lock_;
45   MacDesktopConfiguration desktop_configuration_
46       RTC_GUARDED_BY(&desktop_configuration_lock_);
47   std::set<CGDirectDisplayID> reconfiguring_displays_;
48 
49   RTC_DISALLOW_COPY_AND_ASSIGN(DesktopConfigurationMonitor);
50 };
51 
52 }  // namespace webrtc
53 
54 #endif  // MODULES_DESKTOP_CAPTURE_MAC_DESKTOP_CONFIGURATION_MONITOR_H_
55