| /* |
| * 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 |