1 /* 2 * Copyright (C) 2003, 2004, 2005, 2006, 2010 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COLOR_BLEND_H_ 27 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COLOR_BLEND_H_ 28 29 #include "third_party/blink/renderer/platform/geometry/blend.h" 30 #include "third_party/blink/renderer/platform/graphics/color.h" 31 32 namespace blink { 33 34 inline Color Blend(const Color& from, 35 const Color& to, 36 double progress, 37 bool blend_premultiplied = true) { 38 if (blend_premultiplied) { 39 // Contrary to the name, RGBA32 actually stores ARGB, so we can initialize 40 // Color directly from premultipliedARGBFromColor(). Also, 41 // premultipliedARGBFromColor() bails on zero alpha, so special-case that. 42 Color premult_from = from.Alpha() ? PremultipliedARGBFromColor(from) : 0; 43 Color premult_to = to.Alpha() ? PremultipliedARGBFromColor(to) : 0; 44 45 Color premult_blended( 46 Blend(premult_from.Red(), premult_to.Red(), progress), 47 Blend(premult_from.Green(), premult_to.Green(), progress), 48 Blend(premult_from.Blue(), premult_to.Blue(), progress), 49 Blend(premult_from.Alpha(), premult_to.Alpha(), progress)); 50 51 return Color(ColorFromPremultipliedARGB(premult_blended.Rgb())); 52 } 53 54 return Color(Blend(from.Red(), to.Red(), progress), 55 Blend(from.Green(), to.Green(), progress), 56 Blend(from.Blue(), to.Blue(), progress), 57 Blend(from.Alpha(), to.Alpha(), progress)); 58 } 59 60 } // namespace blink 61 62 #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COLOR_BLEND_H_ 63