/*****************************************************************************
 * This file is part of Kvazaar HEVC encoder.
 *
 * Copyright (C) 2013-2014 Tampere University of Technology and others (see
 * COPYING file).
 *
 * Kvazaar is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * Kvazaar 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 Kvazaar.  If not, see <http://www.gnu.org/licenses/>.
 ****************************************************************************/

/*
 * \file
 */

#include <stdlib.h>

#include "../strategyselector.h"


/**
 * \brief Calculate Sum of Absolute Differences (SAD)
 *
 * Calculate Sum of Absolute Differences (SAD) between two rectangular regions
 * located in arbitrary points in the picture.
 *
 * \param data1   Starting point of the first picture.
 * \param data2   Starting point of the second picture.
 * \param width   Width of the region for which SAD is calculated.
 * \param height  Height of the region for which SAD is calculated.
 * \param stride  Width of the pixel array.
 *
 * \returns Sum of Absolute Differences
 */
static unsigned reg_sad_generic(const pixel * const data1, const pixel * const data2,
                        const int width, const int height, const unsigned stride1, const unsigned stride2)
{
  int y, x;
  unsigned sad = 0;

  for (y = 0; y < height; ++y) {
    for (x = 0; x < width; ++x) {
      sad += abs(data1[y * stride1 + x] - data2[y * stride2 + x]);
    }
  }

  return sad;
}

static int strategy_register_picture_generic(void* opaque) {
  return strategyselector_register(opaque, "reg_sad", "generic", 0, &reg_sad_generic);
}