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 36 namespace blink { 37 38 inline int blend(int from, int to, double progress) 39 { 40 return lround(from + (to - from) * progress); 41 } 42 43 // For unsigned types. 44 template <typename T> 45 inline 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 51 inline double blend(double from, double to, double progress) 52 { 53 return from + (to - from) * progress; 54 } 55 56 inline float blend(float from, float to, double progress) 57 { 58 return static_cast<float>(from + (to - from) * progress); 59 } 60 61 inline LayoutUnit blend(LayoutUnit from, LayoutUnit to, double progress) 62 { 63 return from + (to - from) * progress; 64 } 65 66 inline 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 71 inline 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. 77 inline double accuracyForDuration(double duration) 78 { 79 return 1.0 / (200.0 * duration); 80 } 81 82 } // namespace blink 83 84 #endif // AnimationUtilities_h 85
