src/third_party/webrtc/modules/desktop_capture/mac/desktop_configuration_monitor.h

   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 WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_DESKTOP_CONFIGURATION_MONITOR_H_
  12 #define WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_DESKTOP_CONFIGURATION_MONITOR_H_
  13
  14 #include <ApplicationServices/ApplicationServices.h>
  15
  16 #include <set>
  17
  18 #include "webrtc/modules/desktop_capture/mac/desktop_configuration.h"
  19 #include "webrtc/system_wrappers/interface/atomic32.h"
  20 #include "webrtc/system_wrappers/interface/scoped_ptr.h"
  21
  22 namespace webrtc {
  23
  24 class EventWrapper;
  25
  26 // The class provides functions to synchronize capturing and display
  27 // reconfiguring across threads, and the up-to-date MacDesktopConfiguration.
  28 class DesktopConfigurationMonitor {
  29  public:
  30   DesktopConfigurationMonitor();
  31   // Acquires a lock on the current configuration.
  32   void Lock();
  33   // Releases the lock previously acquired.
  34   void Unlock();
  35   // Returns the current desktop configuration. Should only be called when the
  36   // lock has been acquired.
  37   const MacDesktopConfiguration& desktop_configuration() {
  38     return desktop_configuration_;
  39   }
  40
  41   void AddRef() { ++ref_count_; }
  42   void Release() {
  43     if (--ref_count_ == 0)
  44       delete this;
  45   }
  46
  47  private:
  48   static void DisplaysReconfiguredCallback(CGDirectDisplayID display,
  49                                            CGDisplayChangeSummaryFlags flags,
  50                                            void *user_parameter);
  51   ~DesktopConfigurationMonitor();
  52
  53   void DisplaysReconfigured(CGDirectDisplayID display,
  54                             CGDisplayChangeSummaryFlags flags);
  55
  56   Atomic32 ref_count_;
  57   std::set<CGDirectDisplayID> reconfiguring_displays_;
  58   MacDesktopConfiguration desktop_configuration_;
  59   scoped_ptr<EventWrapper> display_configuration_capture_event_;
  60
  61   DISALLOW_COPY_AND_ASSIGN(DesktopConfigurationMonitor);
  62 };
  63
  64 }  // namespace webrtc
  65
  66 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_DESKTOP_CONFIGURATION_MONITOR_H_