FuzzyPixel.h

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/* 
 *   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */ 

#ifndef GNASH_FUZZYPIXEL_H
#define GNASH_FUZZYPIXEL_H

#include "Range2d.h"
#include "GnashKey.h" // for namespace key
#include "RGBA.h" // for rgba class (composition)

#include <iostream> 

namespace gnash {

//
class FuzzyPixel
{

public:

        friend std::ostream& operator<< (std::ostream& o, const FuzzyPixel& p);

        //
        FuzzyPixel()
                :
                _col(0,0,0,0),
                _tol(-1)
        {
        }

        //
        FuzzyPixel(const rgba& color, short unsigned tolerance=0)
                :
                _col(color),
                // From short unsigned to signed we hopefully never swap sign.
                // Use the default constructor to build intolerant fuzzy pixels.
                _tol(int(tolerance))
        {
        }

        //
        FuzzyPixel(boost::uint8_t r, boost::uint8_t g, boost::uint8_t b, boost::uint8_t a)
                :
                _col(r, g, b, a),
                _tol(0)
        {
        }

        //
        void setTolerance(unsigned short tol)
        {
                _tol = int(tol);
        }

        void setIntolerant()
        {
                _tol = -1;
        }

        //
        bool operator==(const FuzzyPixel& other) const;

        static bool fuzzyEqual(int a, int b, int tol)
        {
                return abs(a-b) <= tol;
        }

private:

        // actual color 
        rgba _col;

        // tolerance value
        int _tol;

};

} // namespace gnash

#endif // _GNASH_FUZZYPIXEL_H