• Skip to content
  • Skip to link menu
KDE 4.3 API Reference
  • KDE API Reference
  • kdelibs
  • Sitemap
  • Contact Us
 

KHTML

ColorDistance.cpp

Go to the documentation of this file.
00001 /*
00002  Copyright (C) 2007 Eric Seidel <eric@webkit.org>
00003  
00004  This file is part of the WebKit project
00005  
00006  This library is free software; you can redistribute it and/or
00007  modify it under the terms of the GNU Library General Public
00008  License as published by the Free Software Foundation; either
00009  version 2 of the License, or (at your option) any later version.
00010  
00011  This library is distributed in the hope that it will be useful,
00012  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  Library General Public License for more details.
00015  
00016  You should have received a copy of the GNU Library General Public License
00017  along with this library; see the file COPYING.LIB.  If not, write to
00018  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00019  Boston, MA 02110-1301, USA.
00020  */
00021 
00022 #include "config.h"
00023 #if ENABLE(SVG)
00024 #include "ColorDistance.h"
00025 #include "Color.h"
00026 #include <wtf/MathExtras.h>
00027 
00028 namespace WebCore {
00029 
00030 ColorDistance::ColorDistance()
00031     : m_redDiff(0)
00032     , m_greenDiff(0)
00033     , m_blueDiff(0)
00034 {
00035 }
00036 
00037 ColorDistance::ColorDistance(const Color& fromColor, const Color& toColor)
00038     : m_redDiff(toColor.red() - fromColor.red())
00039     , m_greenDiff(toColor.green() - fromColor.green())
00040     , m_blueDiff(toColor.blue() - fromColor.blue())
00041 {
00042 }
00043 
00044 ColorDistance::ColorDistance(int redDiff, int greenDiff, int blueDiff)
00045     : m_redDiff(redDiff)
00046     , m_greenDiff(greenDiff)
00047     , m_blueDiff(blueDiff)
00048 {
00049 }
00050 
00051 static inline int clampColorValue(int v)
00052 {
00053     if (v > 255)
00054         v = 255;
00055     else if (v < 0)
00056         v = 0;
00057     return v;
00058 }
00059 
00060 ColorDistance ColorDistance::scaledDistance(float scaleFactor) const
00061 {
00062     return ColorDistance(static_cast<int>(scaleFactor * m_redDiff),
00063                          static_cast<int>(scaleFactor * m_greenDiff),
00064                          static_cast<int>(scaleFactor * m_blueDiff));
00065 }
00066 
00067 Color ColorDistance::addColorsAndClamp(const Color& first, const Color& second)
00068 {
00069     return Color(clampColorValue(first.red() + second.red()),
00070                  clampColorValue(first.green() + second.green()),
00071                  clampColorValue(first.blue() + second.blue()));
00072 }
00073 
00074 Color ColorDistance::addToColorAndClamp(const Color& color) const
00075 {
00076     return Color(clampColorValue(color.red() + m_redDiff),
00077                  clampColorValue(color.green() + m_greenDiff),
00078                  clampColorValue(color.blue() + m_blueDiff));
00079 }
00080 
00081 bool ColorDistance::isZero() const
00082 {
00083     return (m_redDiff == 0 && m_blueDiff == 0 && m_greenDiff == 0);
00084 }
00085 
00086 float ColorDistance::distance() const
00087 {
00088     // This is just a simple distance calculation, not respecting color spaces
00089     return sqrtf(m_redDiff * m_redDiff + m_blueDiff * m_blueDiff + m_greenDiff * m_greenDiff);
00090 }
00091 
00092 }
00093 
00094 #endif

KHTML

Skip menu "KHTML"
  • Main Page
  • Namespace List
  • Class Hierarchy
  • Alphabetical List
  • Class List
  • File List
  • Namespace Members
  • Class Members
  • Related Pages

kdelibs

Skip menu "kdelibs"
  • DNSSD
  • Interfaces
  •   KHexEdit
  •   KMediaPlayer
  •   KSpeech
  •   KTextEditor
  • Kate
  • kconf_update
  • KDE3Support
  •   KUnitTest
  • KDECore
  • KDED
  • KDEsu
  • KDEUI
  • KDocTools
  • KFile
  • KHTML
  • KImgIO
  • KInit
  • kio
  • KIOSlave
  • KJS
  •   KJS-API
  •   WTF
  • kjsembed
  • KNewStuff
  • KParts
  • KPty
  • Kross
  • KUtils
  • Nepomuk
  • Plasma
  • Solid
  • Sonnet
  • ThreadWeaver
Generated for kdelibs by doxygen 1.6.1
This website is maintained by Adriaan de Groot and Allen Winter.
KDE® and the K Desktop Environment® logo are registered trademarks of KDE e.V. | Legal