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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CCFrameRateController_h
#define CCFrameRateController_h
#include <wtf/CurrentTime.h>
#include <wtf/Deque.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
namespace WebCore {
class CCTimeSource;
class CCFrameRateControllerClient {
public:
virtual void vsyncTick() = 0;
protected:
virtual ~CCFrameRateControllerClient() { }
};
class CCFrameRateControllerTimeSourceAdapter;
class CCFrameRateController {
public:
explicit CCFrameRateController(PassRefPtr<CCTimeSource>);
~CCFrameRateController();
void setClient(CCFrameRateControllerClient* client) { m_client = client; }
void setActive(bool);
void setMaxPendingFrames(int);
// 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.
protected:
friend class CCFrameRateControllerTimeSourceAdapter;
void onTimerTick();
CCFrameRateControllerClient* m_client;
int m_numFramesPending;
int m_maxFramesPending;
RefPtr<CCTimeSource> m_timeSource;
OwnPtr<CCFrameRateControllerTimeSourceAdapter> m_timeSourceClientAdapter;
};
}
#endif // CCFrameRateController_h
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