/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef AVUTIL_PIXELUTILS_H
#define AVUTIL_PIXELUTILS_H

#include <stddef.h>
#include <stdint.h>
#include "common.h"

/**
* Sum of abs(src1[x] - src2[x])
*/
typedef int (*av_pixelutils_sad_fn)(const uint8_t *src1, ptrdiff_t stride1,
const uint8_t *src2, ptrdiff_t stride2);

/**
* Get a potentially optimized pointer to a Sum-of-absolute-differences
* function (see the av_pixelutils_sad_fn prototype).
*
* @param w_bits 1<<w_bits is the requested width of the block size
* @param h_bits 1<<h_bits is the requested height of the block size
* @param aligned If set to 2, the returned sad function will assume src1 and
* src2 addresses are aligned on the block size.
* If set to 1, the returned sad function will assume src1 is
* aligned on the block size.
* If set to 0, the returned sad function assume no particular
* alignment.
* @param log_ctx context used for logging, can be NULL
*
* @return a pointer to the SAD function or NULL in case of error (because of
* invalid parameters)
*/
av_pixelutils_sad_fn av_pixelutils_get_sad_fn(int w_bits, int h_bits,
int aligned, void *log_ctx);

#endif /* AVUTIL_PIXELUTILS_H */