/* * Copyright (C) 2017 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 AND ITS CONTRIBUTORS "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 OR ITS 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. */ #include "config.h" #include "ColorUtilities.h" #include "Color.h" #include <wtf/MathExtras.h> namespace WebCore { ColorComponents::ColorComponents(const FloatComponents& floatComponents) { components[0] = clampedColorComponent(floatComponents.components[0]); components[1] = clampedColorComponent(floatComponents.components[1]); components[2] = clampedColorComponent(floatComponents.components[2]); components[3] = clampedColorComponent(floatComponents.components[3]); } // These are the standard sRGB <-> linearRGB conversion functions (https://en.wikipedia.org/wiki/SRGB). float linearToSRGBColorComponent(float c) { if (c < 0.0031308) return 12.92 * c; return clampTo<float>(1.055 * powf(c, 1.0 / 2.4) - 0.055, 0, 1); } float sRGBToLinearColorComponent(float c) { if (c <= 0.04045) return c / 12.92; return clampTo<float>(powf((c + 0.055) / 1.055, 2.4), 0, 1); } Color linearToSRGBColor(const Color& color) { float r, g, b, a; color.getRGBA(r, g, b, a); r = linearToSRGBColorComponent(r); g = linearToSRGBColorComponent(g); b = linearToSRGBColorComponent(b); return Color(r, g, b, a); } Color sRGBToLinearColor(const Color& color) { float r, g, b, a; color.getRGBA(r, g, b, a); r = sRGBToLinearColorComponent(r); g = sRGBToLinearColorComponent(g); b = sRGBToLinearColorComponent(b); return Color(r, g, b, a); } } // namespace WebCore