1/* 2 * Copyright (C) 2007 Eric Seidel <eric@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 27namespace WebCore { 28 29ColorDistance::ColorDistance() 30 : m_redDiff(0) 31 , m_greenDiff(0) 32 , m_blueDiff(0) 33{ 34} 35 36ColorDistance::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 43ColorDistance::ColorDistance(int redDiff, int greenDiff, int blueDiff) 44 : m_redDiff(redDiff) 45 , m_greenDiff(greenDiff) 46 , m_blueDiff(blueDiff) 47{ 48} 49 50static 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 59ColorDistance 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 66Color 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 73Color 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 80bool ColorDistance::isZero() const 81{ 82 return !m_redDiff && !m_blueDiff && !m_greenDiff; 83} 84 85float 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