1 /* 2 * Copyright (C) 2007 Eric Seidel <eric (at) webkit.org> 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20 #include "config.h" 21 #if ENABLE(SVG) 22 #include "ColorDistance.h" 23 24 #include "Color.h" 25 #include <wtf/MathExtras.h> 26 27 namespace WebCore { 28 29 ColorDistance::ColorDistance() 30 : m_redDiff(0) 31 , m_greenDiff(0) 32 , m_blueDiff(0) 33 { 34 } 35 36 ColorDistance::ColorDistance(const Color& fromColor, const Color& toColor) 37 : m_redDiff(toColor.red() - fromColor.red()) 38 , m_greenDiff(toColor.green() - fromColor.green()) 39 , m_blueDiff(toColor.blue() - fromColor.blue()) 40 { 41 } 42 43 ColorDistance::ColorDistance(int redDiff, int greenDiff, int blueDiff) 44 : m_redDiff(redDiff) 45 , m_greenDiff(greenDiff) 46 , m_blueDiff(blueDiff) 47 { 48 } 49 50 static inline int clampColorValue(int v) 51 { 52 if (v > 255) 53 v = 255; 54 else if (v < 0) 55 v = 0; 56 return v; 57 } 58 59 ColorDistance ColorDistance::scaledDistance(float scaleFactor) const 60 { 61 return ColorDistance(static_cast<int>(scaleFactor * m_redDiff), 62 static_cast<int>(scaleFactor * m_greenDiff), 63 static_cast<int>(scaleFactor * m_blueDiff)); 64 } 65 66 Color ColorDistance::addColorsAndClamp(const Color& first, const Color& second) 67 { 68 return Color(clampColorValue(first.red() + second.red()), 69 clampColorValue(first.green() + second.green()), 70 clampColorValue(first.blue() + second.blue())); 71 } 72 73 Color ColorDistance::addToColorAndClamp(const Color& color) const 74 { 75 return Color(clampColorValue(color.red() + m_redDiff), 76 clampColorValue(color.green() + m_greenDiff), 77 clampColorValue(color.blue() + m_blueDiff)); 78 } 79 80 bool ColorDistance::isZero() const 81 { 82 return !m_redDiff && !m_blueDiff && !m_greenDiff; 83 } 84 85 float ColorDistance::distance() const 86 { 87 // This is just a simple distance calculation, not respecting color spaces 88 return sqrtf(m_redDiff * m_redDiff + m_blueDiff * m_blueDiff + m_greenDiff * m_greenDiff); 89 } 90 91 } 92 93 #endif 94