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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 CCFrameRateController_h
#define CCFrameRateController_h
#include "base/memory/scoped_ptr.h"
#include "base/time.h"
#include "CCTimer.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
namespace cc {
class CCThread;
class CCTimeSource;
class CCFrameRateControllerClient {
public:
// Throttled is true when we have a maximum number of frames pending.
virtual void vsyncTick(bool throttled) = 0;
protected:
virtual ~CCFrameRateControllerClient() {}
};
class CCFrameRateControllerTimeSourceAdapter;
class CCFrameRateController : public CCTimerClient {
public:
explicit CCFrameRateController(PassRefPtr<CCTimeSource>);
// Alternate form of CCFrameRateController with unthrottled frame-rate.
explicit CCFrameRateController(CCThread*);
virtual ~CCFrameRateController();
void setClient(CCFrameRateControllerClient* 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 CCFrameRateControllerTimeSourceAdapter;
void onTimerTick();
void postManualTick();
// CCTimerClient implementation (used for unthrottled frame-rate).
virtual void onTimerFired() OVERRIDE;
CCFrameRateControllerClient* m_client;
int m_numFramesPending;
int m_maxFramesPending;
RefPtr<CCTimeSource> m_timeSource;
scoped_ptr<CCFrameRateControllerTimeSourceAdapter> m_timeSourceClientAdapter;
bool m_active;
bool m_swapBuffersCompleteSupported;
// Members for unthrottled frame-rate.
bool m_isTimeSourceThrottling;
scoped_ptr<CCTimer> m_manualTicker;
};
} // namespace cc
#endif // CCFrameRateController_h
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