1 /* 2 Copyright (C) 2007 Eric Seidel <eric (at) webkit.org> 3 4 This file is part of the WebKit project 5 6 This library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Library General Public 8 License as published by the Free Software Foundation; either 9 version 2 of the License, or (at your option) any later version. 10 11 This library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Library General Public License for more details. 15 16 You should have received a copy of the GNU Library General Public License 17 along with this library; see the file COPYING.LIB. If not, write to 18 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 Boston, MA 02110-1301, USA. 20 */ 21 22 #include "config.h" 23 #if ENABLE(SVG) 24 #include "ColorDistance.h" 25 #include "Color.h" 26 #include <wtf/MathExtras.h> 27 28 namespace WebCore { 29 30 ColorDistance::ColorDistance() 31 : m_redDiff(0) 32 , m_greenDiff(0) 33 , m_blueDiff(0) 34 { 35 } 36 37 ColorDistance::ColorDistance(const Color& fromColor, const Color& toColor) 38 : m_redDiff(toColor.red() - fromColor.red()) 39 , m_greenDiff(toColor.green() - fromColor.green()) 40 , m_blueDiff(toColor.blue() - fromColor.blue()) 41 { 42 } 43 44 ColorDistance::ColorDistance(int redDiff, int greenDiff, int blueDiff) 45 : m_redDiff(redDiff) 46 , m_greenDiff(greenDiff) 47 , m_blueDiff(blueDiff) 48 { 49 } 50 51 static inline int clampColorValue(int v) 52 { 53 if (v > 255) 54 v = 255; 55 else if (v < 0) 56 v = 0; 57 return v; 58 } 59 60 ColorDistance ColorDistance::scaledDistance(float scaleFactor) const 61 { 62 return ColorDistance(static_cast<int>(scaleFactor * m_redDiff), 63 static_cast<int>(scaleFactor * m_greenDiff), 64 static_cast<int>(scaleFactor * m_blueDiff)); 65 } 66 67 Color ColorDistance::addColorsAndClamp(const Color& first, const Color& second) 68 { 69 return Color(clampColorValue(first.red() + second.red()), 70 clampColorValue(first.green() + second.green()), 71 clampColorValue(first.blue() + second.blue())); 72 } 73 74 Color ColorDistance::addToColorAndClamp(const Color& color) const 75 { 76 return Color(clampColorValue(color.red() + m_redDiff), 77 clampColorValue(color.green() + m_greenDiff), 78 clampColorValue(color.blue() + m_blueDiff)); 79 } 80 81 bool ColorDistance::isZero() const 82 { 83 return (m_redDiff == 0 && m_blueDiff == 0 && m_greenDiff == 0); 84 } 85 86 float ColorDistance::distance() const 87 { 88 // This is just a simple distance calculation, not respecting color spaces 89 return sqrtf(m_redDiff * m_redDiff + m_blueDiff * m_blueDiff + m_greenDiff * m_greenDiff); 90 } 91 92 } 93 94 #endif 95
