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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.
#ifndef CONTENT_BROWSER_RENDERER_HOST_DISPLAY_LINK_MAC_H_
#define CONTENT_BROWSER_RENDERER_HOST_DISPLAY_LINK_MAC_H_
#import <QuartzCore/CVDisplayLink.h>
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
namespace content {
class DisplayLinkMac : public base::RefCounted<DisplayLinkMac> {
public:
static scoped_refptr<DisplayLinkMac> Create();
// Get vsync scheduling parameters.
bool GetVSyncParameters(
base::TimeTicks* timebase,
base::TimeDelta* interval);
private:
friend class base::RefCounted<DisplayLinkMac>;
DisplayLinkMac(CVDisplayLinkRef display_link);
virtual ~DisplayLinkMac();
void StartOrContinueDisplayLink();
void StopDisplayLink();
void Tick(const CVTimeStamp* time);
static CVReturn DisplayLinkCallback(
CVDisplayLinkRef display_link,
const CVTimeStamp* now,
const CVTimeStamp* output_time,
CVOptionFlags flags_in,
CVOptionFlags* flags_out,
void* context);
// CVDisplayLink for querying VSync timing info.
CVDisplayLinkRef display_link_;
// Timer for stopping the display link if it has not been queried in
// the last second.
base::DelayTimer<DisplayLinkMac> stop_timer_;
// VSync parameters computed during Tick.
bool timebase_and_interval_valid_;
base::TimeTicks timebase_;
base::TimeDelta interval_;
// Lock for sharing data between UI thread and display-link thread.
base::Lock lock_;
};
} // content
#endif // CONTENT_BROWSER_RENDERER_HOST_DISPLAY_LINK_MAC_H_
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