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      1 /*
      2  * Copyright (C) 2011 Apple Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/platform/Clock.h"
     28 
     29 #include "wtf/CurrentTime.h"
     30 
     31 using namespace WebCore;
     32 
     33 Clock::Clock()
     34     : m_running(false)
     35     , m_rate(1)
     36     , m_offset(0)
     37 {
     38     m_startTime = m_lastTime = now();
     39 }
     40 
     41 void Clock::setCurrentTime(double time)
     42 {
     43     m_startTime = m_lastTime = now();
     44     m_offset = time;
     45 }
     46 
     47 double Clock::currentTime() const
     48 {
     49     if (m_running)
     50         m_lastTime = now();
     51     return ((m_lastTime - m_startTime) * m_rate) + m_offset;
     52 }
     53 
     54 void Clock::setPlayRate(double rate)
     55 {
     56     m_offset = now();
     57     m_lastTime = m_startTime = now();
     58     m_rate = rate;
     59 }
     60 
     61 void Clock::start()
     62 {
     63     if (m_running)
     64         return;
     65 
     66     m_lastTime = m_startTime = now();
     67     m_running = true;
     68 }
     69 
     70 void Clock::stop()
     71 {
     72     if (!m_running)
     73         return;
     74 
     75     m_offset = now();
     76     m_lastTime = m_startTime = now();
     77     m_running = false;
     78 }
     79 
     80 double Clock::now() const
     81 {
     82     return WTF::currentTime();
     83 }
     84 
     85 PassRefPtr<Clock> Clock::create()
     86 {
     87     return adoptRef(new Clock());
     88 }
     89