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// Copyright 2011 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 CC_FRAME_RATE_CONTROLLER_H_
#define CC_FRAME_RATE_CONTROLLER_H_
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time.h"
#include "cc/cc_export.h"
namespace cc {
class Thread;
class TimeSource;
class CC_EXPORT FrameRateControllerClient {
public:
// Throttled is true when we have a maximum number of frames pending.
virtual void vsyncTick(bool throttled) = 0;
protected:
virtual ~FrameRateControllerClient() {}
};
class FrameRateControllerTimeSourceAdapter;
class CC_EXPORT FrameRateController {
public:
explicit FrameRateController(scoped_refptr<TimeSource>);
// Alternate form of FrameRateController with unthrottled frame-rate.
explicit FrameRateController(Thread*);
virtual ~FrameRateController();
void setClient(FrameRateControllerClient* client) { m_client = client; }
void setActive(bool);
// Use the following methods to adjust target frame rate.
//
// Multiple frames can be in-progress, but for every didBeginFrame, a
// didFinishFrame should be posted.
//
// If the rendering pipeline crashes, call didAbortAllPendingFrames.
void didBeginFrame();
void didFinishFrame();
void didAbortAllPendingFrames();
void setMaxFramesPending(int); // 0 for unlimited.
// This returns null for unthrottled frame-rate.
base::TimeTicks nextTickTime();
void setTimebaseAndInterval(base::TimeTicks timebase, base::TimeDelta interval);
void setSwapBuffersCompleteSupported(bool);
protected:
friend class FrameRateControllerTimeSourceAdapter;
void onTimerTick();
void postManualTick();
void manualTick();
FrameRateControllerClient* m_client;
int m_numFramesPending;
int m_maxFramesPending;
scoped_refptr<TimeSource> m_timeSource;
scoped_ptr<FrameRateControllerTimeSourceAdapter> m_timeSourceClientAdapter;
bool m_active;
bool m_swapBuffersCompleteSupported;
// Members for unthrottled frame-rate.
bool m_isTimeSourceThrottling;
base::WeakPtrFactory<FrameRateController> m_weakFactory;
Thread* m_thread;
DISALLOW_COPY_AND_ASSIGN(FrameRateController);
};
} // namespace cc
#endif // CC_FRAME_RATE_CONTROLLER_H_
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