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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 UI_DISPLAY_MAC_DISPLAY_LINK_MAC_H_
#define UI_DISPLAY_MAC_DISPLAY_LINK_MAC_H_
#include <QuartzCore/CVDisplayLink.h>
#include <map>
#include "base/mac/scoped_typeref.h"
#include "base/memory/ref_counted.h"
#include "base/single_thread_task_runner.h"
#include "base/time/time.h"
#include "ui/display/display_export.h"
namespace ui {
class DISPLAY_EXPORT DisplayLinkMac
: public base::RefCountedThreadSafe<DisplayLinkMac> {
public:
// This must only be called from the main thread.
static scoped_refptr<DisplayLinkMac> GetForDisplay(
CGDirectDisplayID display_id);
// Get vsync scheduling parameters. Returns false if the populated parameters
// are invalid.
bool GetVSyncParameters(base::TimeTicks* timebase, base::TimeDelta* interval);
// Get the panel/monitor refresh rate
double GetRefreshRate();
private:
friend class base::RefCountedThreadSafe<DisplayLinkMac>;
DisplayLinkMac(CGDirectDisplayID display_id,
base::ScopedTypeRef<CVDisplayLinkRef> display_link);
virtual ~DisplayLinkMac();
void StartOrContinueDisplayLink();
void StopDisplayLink();
// Looks up the display and calls UpdateVSyncParameters() on the corresponding
// DisplayLinkMac.
static void DoUpdateVSyncParameters(CGDirectDisplayID display,
const CVTimeStamp& time);
// Processes the display link callback.
void UpdateVSyncParameters(const CVTimeStamp& time);
// Called by the system on the display link thread, and posts a call to
// DoUpdateVSyncParameters() to the UI thread.
static CVReturn DisplayLinkCallback(CVDisplayLinkRef display_link,
const CVTimeStamp* now,
const CVTimeStamp* output_time,
CVOptionFlags flags_in,
CVOptionFlags* flags_out,
void* context);
// This is called whenever the display is reconfigured, and marks that the
// vsync parameters must be recalculated.
static void DisplayReconfigurationCallBack(CGDirectDisplayID display,
CGDisplayChangeSummaryFlags flags,
void* user_info);
// The display that this display link is attached to.
CGDirectDisplayID display_id_;
// CVDisplayLink for querying VSync timing info.
base::ScopedTypeRef<CVDisplayLinkRef> display_link_;
// The task runner to post tasks to from the display link thread.
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
// VSync parameters computed during UpdateVSyncParameters().
bool timebase_and_interval_valid_ = false;
base::TimeTicks timebase_;
base::TimeDelta interval_;
// The time after which we should re-start the display link to get fresh
// parameters.
base::TimeTicks recalculate_time_;
};
} // namespace ui
#endif // UI_DISPLAY_MAC_DISPLAY_LINK_MAC_H_
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