/*

 *  Copyright (c) 2023 The WebM project authors. All Rights Reserved.

 *

 *  Use of this source code is governed by a BSD-style license

 *  that can be found in the LICENSE file in the root of the source

 *  tree. An additional intellectual property rights grant can be found

 *  in the file PATENTS.  All contributing project authors may

 *  be found in the AUTHORS file in the root of the source tree.

 */

/*

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

 * buffers.

 */

#include <stdlib.h>

#include "./vpx_config.h"

#include "./vpx_dsp_rtcd.h"

#include "vpx/vpx_integer.h"

#include "vpx_ports/mem.h"

int64_t vpx_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_VP9_HIGHBITDEPTH

int64_t vpx_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