/*

 * Copyright (c) 2018, Alliance for Open Media. All rights reserved.

 *

 * This source code is subject to the terms of the BSD 2 Clause License and

 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License

 * was not distributed with this source code in the LICENSE file, you can

 * obtain it at www.aomedia.org/license/software. If the Alliance for Open

 * Media Patent License 1.0 was not distributed with this source code in the

 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.

 */

/*

 * Sum the square of the difference between every corresponding element of the

 * buffers.

 */

#include <stdlib.h>

#include "config/aom_config.h"

#include "config/aom_dsp_rtcd.h"

#include "aom/aom_integer.h"

int64_t aom_sse_c(const uint8_t *a, int a_stride, const uint8_t *b,

                  int b_stride, int width, int height) {

  int y, x;

  int64_t sse = 0;

  for (y = 0; y < height; y++) {

    for (x = 0; x < width; x++) {

      const int32_t diff = abs(a[x] - b[x]);

      sse += diff * diff;

    }

    a += a_stride;

    b += b_stride;

  }

  return sse;

}

#if CONFIG_AV1_HIGHBITDEPTH

int64_t aom_highbd_sse_c(const uint8_t *a8, int a_stride, const uint8_t *b8,

                         int b_stride, int width, int height) {

  int y, x;

  int64_t sse = 0;

  uint16_t *a = CONVERT_TO_SHORTPTR(a8);

  uint16_t *b = CONVERT_TO_SHORTPTR(b8);

  for (y = 0; y < height; y++) {

    for (x = 0; x < width; x++) {

      const int32_t diff = (int32_t)(a[x]) - (int32_t)(b[x]);

      sse += diff * diff;

    }

    a += a_stride;

    b += b_stride;

  }

  return sse;

}

#endif