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 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 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 "IntPoint.h" 30#include "LayoutUnit.h" 31 32namespace WebCore { 33 34inline int blend(int from, int to, double progress) 35{ 36 return static_cast<int>(lround(static_cast<double>(from) + static_cast<double>(to - from) * progress)); 37} 38 39inline unsigned blend(unsigned from, unsigned to, double progress) 40{ 41 return static_cast<unsigned>(lround(to > from ? static_cast<double>(from) + static_cast<double>(to - from) * progress : static_cast<double>(from) - static_cast<double>(from - to) * progress)); 42} 43 44inline double blend(double from, double to, double progress) 45{ 46 return from + (to - from) * progress; 47} 48 49inline float blend(float from, float to, double progress) 50{ 51 return static_cast<float>(from + (to - from) * progress); 52} 53 54inline LayoutUnit blend(LayoutUnit from, LayoutUnit to, double progress) 55{ 56 return from + (to - from) * progress; 57} 58 59inline IntPoint blend(const IntPoint& from, const IntPoint& to, double progress) 60{ 61 return IntPoint(blend(from.x(), to.x(), progress), 62 blend(from.y(), to.y(), progress)); 63} 64 65} // namespace WebCore 66 67#endif // AnimationUtilities_h 68