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https://github.com/flutter/flutter.git
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95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
/*
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* Copyright (C) 2011 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "sky/engine/platform/Clock.h"
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#include "sky/engine/wtf/CurrentTime.h"
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namespace blink {
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Clock::Clock()
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: m_running(false)
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, m_rate(1)
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, m_offset(0)
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{
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m_startTime = m_lastTime = now();
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}
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void Clock::setCurrentTime(double time)
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{
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m_startTime = m_lastTime = now();
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m_offset = time;
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}
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double Clock::currentTime() const
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{
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return currentDelta() + m_offset;
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}
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void Clock::setPlayRate(double rate)
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{
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m_offset += currentDelta();
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m_lastTime = m_startTime = now();
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m_rate = rate;
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}
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void Clock::start()
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{
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if (m_running)
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return;
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m_lastTime = m_startTime = now();
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m_running = true;
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}
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void Clock::stop()
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{
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if (!m_running)
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return;
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m_offset += currentDelta();
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m_lastTime = m_startTime = now();
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m_running = false;
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}
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double Clock::now() const
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{
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return WTF::currentTime();
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}
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double Clock::currentDelta() const
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{
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if (m_running)
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m_lastTime = now();
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return (m_lastTime - m_startTime) * m_rate;
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}
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PassOwnPtr<Clock> Clock::create()
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{
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return adoptPtr(new Clock());
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}
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} // namespace blink
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