monitor_finder_mac.h revision a1401311d1ab56c4ed0a474bd38c108f75cb0cd9 
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
13namespace 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.
19class 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_
51