File indexing completed on 2024-04-28 11:39:08

 /*
  Copyright (C) 2007 Eric Seidel <eric@webkit.org>
 
  This file is part of the WebKit project
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.
 
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.
 
  You should have received a copy of the GNU Library General Public License
  along with this library; see the file COPYING.LIB.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  Boston, MA 02110-1301, USA.
  */
 
 #if ENABLE(SVG)
 #include "ColorDistance.h"
 #include "Color.h"
 #include <wtf/MathExtras.h>
 
 namespace WebCore
 {
 
 ColorDistance::ColorDistance()
     : m_redDiff(0)
     , m_greenDiff(0)
     , m_blueDiff(0)
 {
 }
 
 ColorDistance::ColorDistance(const Color &fromColor, const Color &toColor)
     : m_redDiff(toColor.red() - fromColor.red())
     , m_greenDiff(toColor.green() - fromColor.green())
     , m_blueDiff(toColor.blue() - fromColor.blue())
 {
 }
 
 ColorDistance::ColorDistance(int redDiff, int greenDiff, int blueDiff)
     : m_redDiff(redDiff)
     , m_greenDiff(greenDiff)
     , m_blueDiff(blueDiff)
 {
 }
 
 static inline int clampColorValue(int v)
 {
     if (v > 255) {
         v = 255;
     } else if (v < 0) {
         v = 0;
     }
     return v;
 }
 
 ColorDistance ColorDistance::scaledDistance(float scaleFactor) const
 {
     return ColorDistance(static_cast<int>(scaleFactor * m_redDiff),
                          static_cast<int>(scaleFactor * m_greenDiff),
                          static_cast<int>(scaleFactor * m_blueDiff));
 }
 
 Color ColorDistance::addColorsAndClamp(const Color &first, const Color &second)
 {
     return Color(clampColorValue(first.red() + second.red()),
                  clampColorValue(first.green() + second.green()),
                  clampColorValue(first.blue() + second.blue()));
 }
 
 Color ColorDistance::addToColorAndClamp(const Color &color) const
 {
     return Color(clampColorValue(color.red() + m_redDiff),
                  clampColorValue(color.green() + m_greenDiff),
                  clampColorValue(color.blue() + m_blueDiff));
 }
 
 bool ColorDistance::isZero() const
 {
     return (m_redDiff == 0 && m_blueDiff == 0 && m_greenDiff == 0);
 }
 
 float ColorDistance::distance() const
 {
     // This is just a simple distance calculation, not respecting color spaces
     return sqrtf(m_redDiff * m_redDiff + m_blueDiff * m_blueDiff + m_greenDiff * m_greenDiff);
 }
 
 }
 
 #endif