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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 "CCTimer.h"
#include <wtf/Deque.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
namespace WebCore {
class CCThread;
class CCTimeSource;
class CCFrameRateControllerClient {
public:
virtual void vsyncTick() = 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.
double nextTickTimeIfActivated();
void setTimebaseAndInterval(double timebase, double intervalSeconds);
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;
OwnPtr<CCFrameRateControllerTimeSourceAdapter> m_timeSourceClientAdapter;
bool m_active;
// Members for unthrottled frame-rate.
bool m_isTimeSourceThrottling;
OwnPtr<CCTimer> m_manualTicker;
};
}
#endif // CCFrameRateController_h
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