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      1 /*
      2  * Copyright (C) 2013 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef AnimationClock_h
     32 #define AnimationClock_h
     33 
     34 #include "wtf/CurrentTime.h"
     35 #include "wtf/Noncopyable.h"
     36 #include "wtf/PassOwnPtr.h"
     37 #include <limits>
     38 
     39 namespace blink {
     40 
     41 class AnimationClock {
     42     WTF_MAKE_NONCOPYABLE(AnimationClock);
     43 public:
     44     explicit AnimationClock(WTF::TimeFunction monotonicallyIncreasingTime = WTF::monotonicallyIncreasingTime)
     45         : m_monotonicallyIncreasingTime(monotonicallyIncreasingTime)
     46         , m_time(0)
     47         , m_currentTask(std::numeric_limits<unsigned>::max())
     48     {
     49     }
     50 
     51     void updateTime(double time);
     52     double currentTime();
     53     void resetTimeForTesting(double time = 0);
     54 
     55     static void notifyTaskStart() { ++s_currentTask; }
     56 
     57 private:
     58     WTF::TimeFunction m_monotonicallyIncreasingTime;
     59     double m_time;
     60     unsigned m_currentTask;
     61     static unsigned s_currentTask;
     62 };
     63 
     64 } // namespace blink
     65 
     66 #endif // AnimationClock_h
     67