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pixel_accum.h

// Copyright 2002 David Hilvert <dhilvert@auricle.dyndns.org>,
//                              <dhilvert@ugcs.caltech.edu>

/*  This file is part of the Anti-Lamenessing Engine.

    The Anti-Lamenessing Engine 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 2 of the License, or
    (at your option) any later version.

    The Anti-Lamenessing Engine 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 the Anti-Lamenessing Engine; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef __pixel_accum_h__
#define __pixel_accum_h__

#include "pixel.h"

/*
 * Structure to accumulate values over many pixels.
 */

class pixel_accum {
private:    
      ale_accum x[3];

public:
      pixel_accum() {
            x[0] = 0;
            x[1] = 0;
            x[2] = 0;
      }

      pixel_accum(ale_accum x0, ale_accum x1, ale_accum x2) {
            x[0] = x0;
            x[1] = x1;
            x[2] = x2;
      }

      pixel_accum(pixel p) {
            x[0] = p[0];
            x[1] = p[1];
            x[2] = p[2];
      }

      operator pixel() {
            pixel result;
            
            result[0] = x[0];
            result[1] = x[1];
            result[2] = x[2];

            return result;
      }

//    Due to automatic typecasts and automatic int <==> ale_accum *
//    conversions, this can cause some really weird bugs.
//
//    pixel_accum(ale_accum *_x) {
//          x[0] = _x[0];
//          x[1] = _x[1];
//          x[2] = _x[2];
//    }

      const ale_accum &operator[](int i) const {
            assert (i >= 0);
            assert (i < 3);

            return x[i];
      }

      ale_accum &operator[](int i) {
            assert (i >= 0);
            assert (i < 3);

            return x[i];
      }

      pixel_accum operator+(pixel_accum p) const {
            return pixel_accum(p[0] + x[0], p[1] + x[1], p[2] + x[2]);
      }

      pixel_accum operator-(pixel_accum p) const {
            return pixel_accum(x[0] - p[0], x[1] - p[1], x[2] - p[2]);
      }

      pixel_accum operator/(pixel_accum p) const {
            return pixel_accum(x[0] / p[0], x[1] / p[1], x[2] / p[2]);
      }

      pixel_accum operator/(ale_accum d) const {
            return pixel_accum(x[0] / d, x[1] / d, x[2] / d);
      }

      pixel_accum operator*(pixel_accum p) const {
            return pixel_accum(x[0] * p[0], x[1] * p[1], x[2] * p[2]);
      }

      pixel_accum operator*(ale_accum d) const {
            return pixel_accum(x[0] * d, x[1] * d, x[2] * d);
      }

      pixel_accum operator+=(pixel_accum p) {
            return pixel_accum(x[0] += p[0], x[1] += p[1], x[2] += p[2]);
      }

      pixel_accum operator*=(pixel_accum p) {
            return pixel_accum(x[0] *= p[0], x[1] *= p[1], x[2] *= p[2]);
      }

      pixel_accum operator*=(ale_accum d) {
            return pixel_accum(x[0] *= d, x[1] *= d, x[2] *= d);
      }

      pixel_accum operator/=(pixel_accum p) {
            return pixel_accum(x[0] /= p[0], x[1] /= p[1], x[2] /= p[2]);
      }

      pixel_accum operator/=(ale_accum d) {
            return pixel_accum(x[0] /= d, x[1] /= d, x[2] /= d);
      }
};

inline pixel_accum operator*(float d, const pixel_accum &p) {
      return p * d;
}

inline pixel_accum operator*(double d, const pixel_accum &p) {
      return p * d;
}

inline std::ostream &operator<<(std::ostream &o, const pixel_accum &p) {
      o << "[" << p[0] << " " << p[1] << " " << p[2] << "]";
      return o;
}

inline pixel_accum ppow(pixel_accum p, float d) {
      return pixel_accum(
                  pow((ale_accum) p[0], d),
                  pow((ale_accum) p[1], d),
                  pow((ale_accum) p[2], d));
}

inline pixel_accum ppow(pixel_accum p, double d) {
      return pixel_accum(
                  pow((ale_accum) p[0], d),
                  pow((ale_accum) p[1], d),
                  pow((ale_accum) p[2], d));
}

#endif

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