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 #ifndef Clock_h 27 #define Clock_h 28 29 #include "platform/PlatformExport.h" 30 #include "wtf/PassOwnPtr.h" 31 #include "wtf/RefCounted.h" 32 33 namespace WebCore { 34 35 class PLATFORM_EXPORT Clock { 36 public: 37 static PassOwnPtr<Clock> create(); 38 39 void setCurrentTime(double); 40 double currentTime() const; 41 42 void setPlayRate(double); 43 double playRate() const { return m_rate; } 44 45 void start(); 46 void stop(); 47 bool isRunning() const { return m_running; } 48 49 private: 50 Clock(); 51 double now() const; 52 double currentDelta() const; 53 54 bool m_running; 55 double m_rate; 56 double m_offset; 57 double m_startTime; 58 mutable double m_lastTime; 59 }; 60 61 } 62 63 #endif 64
