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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.
*/
#include "config.h"
#include "cc/CCFrameRateController.h"
#include "TraceEvent.h"
#include "cc/CCThread.h"
#include "cc/CCThreadTask.h"
namespace WebCore {
class CCFrameRateControllerTimeSourceAdapter : public CCTimeSourceClient {
public:
static PassOwnPtr<CCFrameRateControllerTimeSourceAdapter> create(CCFrameRateController* frameRateController)
{
return adoptPtr(new CCFrameRateControllerTimeSourceAdapter(frameRateController));
}
virtual ~CCFrameRateControllerTimeSourceAdapter() { }
virtual void onTimerTick() { m_frameRateController->onTimerTick(); }
private:
explicit CCFrameRateControllerTimeSourceAdapter(CCFrameRateController* frameRateController)
: m_frameRateController(frameRateController) { }
CCFrameRateController* m_frameRateController;
};
CCFrameRateController::CCFrameRateController(PassRefPtr<CCTimeSource> timer)
: m_client(0)
, m_numFramesPending(0)
, m_maxFramesPending(0)
, m_timeSource(timer)
{
m_timeSourceClientAdapter = CCFrameRateControllerTimeSourceAdapter::create(this);
m_timeSource->setClient(m_timeSourceClientAdapter.get());
}
CCFrameRateController::~CCFrameRateController()
{
m_timeSource->setActive(false);
}
void CCFrameRateController::setActive(bool active)
{
if (m_timeSource->active() == active)
return;
TRACE_EVENT("CCFrameRateController::setActive", 0, (active ? "active" : "inactive"));
m_timeSource->setActive(active);
}
void CCFrameRateController::setMaxFramesPending(int maxFramesPending)
{
m_maxFramesPending = maxFramesPending;
}
void CCFrameRateController::onTimerTick()
{
ASSERT(m_timeSource->active());
// Don't forward the tick if we have too many frames in flight.
if (m_maxFramesPending && m_numFramesPending >= m_maxFramesPending) {
TRACE_EVENT("CCFrameRateController::onTimerTickButMaxFramesPending", 0, 0);
return;
}
if (m_client)
m_client->beginFrame();
}
void CCFrameRateController::didBeginFrame()
{
m_numFramesPending++;
}
void CCFrameRateController::didFinishFrame()
{
m_numFramesPending--;
}
void CCFrameRateController::didAbortAllPendingFrames()
{
m_numFramesPending = 0;
}
}
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