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 AnimationUtilities_h 27#define AnimationUtilities_h 28 29#include "platform/LayoutUnit.h" 30#include "platform/PlatformExport.h" 31#include "platform/geometry/FloatPoint.h" 32#include "platform/geometry/IntPoint.h" 33#include "wtf/MathExtras.h" 34#include "wtf/TypeTraits.h" 35 36namespace blink { 37 38inline int blend(int from, int to, double progress) 39{ 40 return lround(from + (to - from) * progress); 41} 42 43// For unsigned types. 44template <typename T> 45inline T blend(T from, T to, double progress) 46{ 47 COMPILE_ASSERT(WTF::IsInteger<T>::value, BlendForUnsignedTypes); 48 return clampTo<T>(round(to > from ? from + (to - from) * progress : from - (from - to) * progress)); 49} 50 51inline double blend(double from, double to, double progress) 52{ 53 return from + (to - from) * progress; 54} 55 56inline float blend(float from, float to, double progress) 57{ 58 return static_cast<float>(from + (to - from) * progress); 59} 60 61inline LayoutUnit blend(LayoutUnit from, LayoutUnit to, double progress) 62{ 63 return from + (to - from) * progress; 64} 65 66inline IntPoint blend(const IntPoint& from, const IntPoint& to, double progress) 67{ 68 return IntPoint(blend(from.x(), to.x(), progress), blend(from.y(), to.y(), progress)); 69} 70 71inline FloatPoint blend(const FloatPoint& from, const FloatPoint& to, double progress) 72{ 73 return FloatPoint(blend(from.x(), to.x(), progress), blend(from.y(), to.y(), progress)); 74} 75 76// Calculates the accuracy for evaluating a timing function for an animation with the specified duration. 77inline double accuracyForDuration(double duration) 78{ 79 return 1.0 / (200.0 * duration); 80} 81 82} // namespace blink 83 84#endif // AnimationUtilities_h 85