chrome/browser/renderer_host/pepper/monitor_finder_mac.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_RENDERER_HOST_PEPPER_MONITOR_FINDER_MAC_H_
   6 #define CHROME_BROWSER_RENDERER_HOST_PEPPER_MONITOR_FINDER_MAC_H_
   7
   8 #include <ApplicationServices/ApplicationServices.h>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/synchronization/lock.h"
  12
  13 namespace chrome {
  14
  15 // MonitorFinder maps a RenderFrameHost to the display ID on which the widget
  16 // is painting. This class operates on the IO thread while the RenderFrameHost
  17 // is on the UI thread, so the value returned by GetMonitor() may be 0 until
  18 // the information can be retrieved asynchronously.
  19 class MonitorFinder : public base::RefCountedThreadSafe<MonitorFinder> {
  20  public:
  21   MonitorFinder(int process_id, int render_frame_id);
  22
  23   // Gets the native display ID for the <process_id, render_frame_id> tuple.
  24   int64_t GetMonitor();
  25
  26   // Checks if the given |monitor_id| represents a built-in display.
  27   static bool IsMonitorBuiltIn(int64_t monitor_id);
  28
  29  private:
  30   friend class base::RefCountedThreadSafe<MonitorFinder>;
  31   ~MonitorFinder();
  32
  33   // Method run on the UI thread to get the display information.
  34   void FetchMonitorFromWidget();
  35
  36   const int process_id_;
  37   const int render_frame_id_;
  38
  39   base::Lock mutex_;  // Protects the two members below.
  40   // Whether one request to FetchMonitorFromWidget() has been made already.
  41   bool request_sent_;
  42   // The native display ID for the RenderFrameHost.
  43   CGDirectDisplayID display_id_;
  44
  45   DISALLOW_COPY_AND_ASSIGN(MonitorFinder);
  46 };
  47
  48 }  // namespace chrome
  49
  50 #endif  // CHROME_BROWSER_RENDERER_HOST_PEPPER_MONITOR_FINDER_H_