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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.
#include "config.h"
#include "CCFrameRateController.h"
#include "CCDelayBasedTimeSource.h"
#include "CCTimeSource.h"
#include "TraceEvent.h"
#include <wtf/CurrentTime.h>
namespace WebCore {
class CCFrameRateControllerTimeSourceAdapter : public CCTimeSourceClient {
public:
static PassOwnPtr<CCFrameRateControllerTimeSourceAdapter> create(CCFrameRateController* frameRateController)
{
return adoptPtr(new CCFrameRateControllerTimeSourceAdapter(frameRateController));
}
virtual ~CCFrameRateControllerTimeSourceAdapter() { }
virtual void onTimerTick() OVERRIDE { 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_active(false)
, m_isTimeSourceThrottling(true)
{
m_timeSourceClientAdapter = CCFrameRateControllerTimeSourceAdapter::create(this);
m_timeSource->setClient(m_timeSourceClientAdapter.get());
}
CCFrameRateController::CCFrameRateController(CCThread* thread)
: m_client(0)
, m_numFramesPending(0)
, m_maxFramesPending(0)
, m_active(false)
, m_isTimeSourceThrottling(false)
{
m_manualTicker = adoptPtr(new CCTimer(thread, this));
}
CCFrameRateController::~CCFrameRateController()
{
if (m_isTimeSourceThrottling)
m_timeSource->setActive(false);
}
void CCFrameRateController::setActive(bool active)
{
if (m_active == active)
return;
TRACE_EVENT1("cc", "CCFrameRateController::setActive", "active", active);
m_active = active;
if (m_isTimeSourceThrottling)
m_timeSource->setActive(active);
else {
if (active)
postManualTick();
else
m_manualTicker->stop();
}
}
void CCFrameRateController::setMaxFramesPending(int maxFramesPending)
{
m_maxFramesPending = maxFramesPending;
}
void CCFrameRateController::setTimebaseAndInterval(double timebase, double intervalSeconds)
{
if (m_isTimeSourceThrottling)
m_timeSource->setTimebaseAndInterval(timebase, intervalSeconds);
}
void CCFrameRateController::onTimerTick()
{
ASSERT(m_active);
// Don't forward the tick if we have too many frames in flight.
if (m_maxFramesPending && m_numFramesPending >= m_maxFramesPending) {
TRACE_EVENT0("cc", "CCFrameRateController::onTimerTickButMaxFramesPending");
return;
}
if (m_client)
m_client->vsyncTick();
if (!m_isTimeSourceThrottling
&& (!m_maxFramesPending || m_numFramesPending < m_maxFramesPending))
postManualTick();
}
void CCFrameRateController::postManualTick()
{
if (m_active)
m_manualTicker->startOneShot(0);
}
void CCFrameRateController::onTimerFired()
{
onTimerTick();
}
void CCFrameRateController::didBeginFrame()
{
m_numFramesPending++;
}
void CCFrameRateController::didFinishFrame()
{
m_numFramesPending--;
if (!m_isTimeSourceThrottling)
postManualTick();
}
void CCFrameRateController::didAbortAllPendingFrames()
{
m_numFramesPending = 0;
}
double CCFrameRateController::nextTickTimeIfActivated()
{
if (m_isTimeSourceThrottling)
return m_timeSource->nextTickTimeIfActivated();
return monotonicallyIncreasingTime();
}
}
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