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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <ApplicationServices/ApplicationServices.h>
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
namespace chrome {
// MonitorFinder maps a RenderFrameHost to the display ID on which the widget
// is painting. This class operates on the IO thread while the RenderFrameHost
// is on the UI thread, so the value returned by GetMonitor() may be 0 until
// the information can be retrieved asynchronously.
class MonitorFinder : public base::RefCountedThreadSafe<MonitorFinder> {
MonitorFinder(int process_id, int render_frame_id);
// Gets the native display ID for the <process_id, render_frame_id> tuple.
int64_t GetMonitor();
// Checks if the given |monitor_id| represents a built-in display.
static bool IsMonitorBuiltIn(int64_t monitor_id);
friend class base::RefCountedThreadSafe<MonitorFinder>;
// Method run on the UI thread to get the display information.
void FetchMonitorFromWidget();
const int process_id_;
const int render_frame_id_;
base::Lock mutex_; // Protects the two members below.
// Whether one request to FetchMonitorFromWidget() has been made already.
bool request_sent_;
// The native display ID for the RenderFrameHost.
CGDirectDisplayID display_id_;
} // namespace chrome