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/*
* Copyright (C) 2011 Apple 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
* 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 "platform/Clock.h"
#include "wtf/CurrentTime.h"
namespace WebCore {
Clock::Clock()
: m_running(false)
, m_rate(1)
, m_offset(0)
{
m_startTime = m_lastTime = now();
}
void Clock::setCurrentTime(double time)
{
m_startTime = m_lastTime = now();
m_offset = time;
}
double Clock::currentTime() const
{
return currentDelta() + m_offset;
}
void Clock::setPlayRate(double rate)
{
m_offset += currentDelta();
m_lastTime = m_startTime = now();
m_rate = rate;
}
void Clock::start()
{
if (m_running)
return;
m_lastTime = m_startTime = now();
m_running = true;
}
void Clock::stop()
{
if (!m_running)
return;
m_offset += currentDelta();
m_lastTime = m_startTime = now();
m_running = false;
}
double Clock::now() const
{
return WTF::currentTime();
}
double Clock::currentDelta() const
{
if (m_running)
m_lastTime = now();
return (m_lastTime - m_startTime) * m_rate;
}
PassOwnPtr<Clock> Clock::create()
{
return adoptPtr(new Clock());
}
} // namespace WebCore
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