| /* |
| * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COLOR_BLEND_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COLOR_BLEND_H_ |
| |
| #include "third_party/blink/renderer/platform/geometry/blend.h" |
| #include "third_party/blink/renderer/platform/graphics/color.h" |
| |
| namespace blink { |
| |
| inline Color Blend(const Color& from, |
| const Color& to, |
| double progress, |
| bool blend_premultiplied = true) { |
| if (blend_premultiplied) { |
| // Contrary to the name, RGBA32 actually stores ARGB, so we can initialize |
| // Color directly from premultipliedARGBFromColor(). Also, |
| // premultipliedARGBFromColor() bails on zero alpha, so special-case that. |
| Color premult_from = from.Alpha() ? PremultipliedARGBFromColor(from) : 0; |
| Color premult_to = to.Alpha() ? PremultipliedARGBFromColor(to) : 0; |
| |
| Color premult_blended( |
| Blend(premult_from.Red(), premult_to.Red(), progress), |
| Blend(premult_from.Green(), premult_to.Green(), progress), |
| Blend(premult_from.Blue(), premult_to.Blue(), progress), |
| Blend(premult_from.Alpha(), premult_to.Alpha(), progress)); |
| |
| return Color(ColorFromPremultipliedARGB(premult_blended.Rgb())); |
| } |
| |
| return Color(Blend(from.Red(), to.Red(), progress), |
| Blend(from.Green(), to.Green(), progress), |
| Blend(from.Blue(), to.Blue(), progress), |
| Blend(from.Alpha(), to.Alpha(), progress)); |
| } |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COLOR_BLEND_H_ |