colordistance.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 Copyright (C) 2007 Eric Seidel <[e-mail]>
 
 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.
 */

#ifndef ColorDistance_h
#define ColorDistance_h
#if ENABLE(SVG)

namespace WebCore {
    
    class Color;

    class ColorDistance {
    public:
        ColorDistance();
        ColorDistance(const Color& fromColor, const Color& toColor);
        ColorDistance(int redDiff, int blueDiff, int greenDiff);
        
        ColorDistance scaledDistance(float scaleFactor) const;
        Color addToColorAndClamp(const Color&) const;
        
        static Color addColorsAndClamp(const Color&, const Color&);
        
        bool isZero() const;
        
        float distance() const;
        
    private:
        short m_redDiff;
        short m_greenDiff;
        short m_blueDiff;
    };
}

#endif // ENABLE(SVG)
#endif // ColorDistance_h