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ColorDistance.h

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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 #ifndef ColorDistance_h
00023 #define ColorDistance_h
00024 #if ENABLE(SVG)
00025 
00026 namespace WebCore {
00027     
00028     class Color;
00029 
00030     class ColorDistance {
00031     public:
00032         ColorDistance();
00033         ColorDistance(const Color& fromColor, const Color& toColor);
00034         ColorDistance(int redDiff, int blueDiff, int greenDiff);
00035         
00036         ColorDistance scaledDistance(float scaleFactor) const;
00037         Color addToColorAndClamp(const Color&) const;
00038         
00039         static Color addColorsAndClamp(const Color&, const Color&);
00040         
00041         bool isZero() const;
00042         
00043         float distance() const;
00044         
00045     private:
00046         short m_redDiff;
00047         short m_greenDiff;
00048         short m_blueDiff;
00049     };
00050 }
00051 
00052 #endif // ENABLE(SVG)
00053 #endif // ColorDistance_h

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