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/*
* Copyright (c) 2022 Thilo Borgmann <thilo.borgmann _at_ mail.de>
*
* 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
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*/
#include "libavutil/avassert.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#undef pixel
#if DEPTH == 8
#define pixel uint8_t
#else
#define pixel uint16_t
#endif
#undef fn
#undef fn2
#undef fn3
#define fn3(a,b) ff_##a##_##b
#define fn2(a,b) fn3(a,b)
#define fn(a) fn2(a, DEPTH)
void fn(sobel)(int w, int h,
uint16_t *dst, int dst_linesize,
int8_t *dir, int dir_linesize,
const uint8_t *src, int src_linesize, int src_stride)
{
pixel *srcp = (pixel *)src;
src_stride /= sizeof(pixel);
src_linesize /= sizeof(pixel);
dst_linesize /= sizeof(pixel);
for (int j = 1; j < h - 1; j++) {
dst += dst_linesize;
dir += dir_linesize;
srcp += src_linesize;
for (int i = 1; i < w - 1; i++) {
const int gx =
-1*srcp[-src_linesize + (i-1)*src_stride] + 1*srcp[-src_linesize + (i+1)*src_stride]
-2*srcp[ (i-1)*src_stride] + 2*srcp[ (i+1)*src_stride]
-1*srcp[ src_linesize + (i-1)*src_stride] + 1*srcp[ src_linesize + (i+1)*src_stride];
const int gy =
-1*srcp[-src_linesize + (i-1)*src_stride] + 1*srcp[ src_linesize + (i-1)*src_stride]
-2*srcp[-src_linesize + (i )*src_stride] + 2*srcp[ src_linesize + (i )*src_stride]
-1*srcp[-src_linesize + (i+1)*src_stride] + 1*srcp[ src_linesize + (i+1)*src_stride];
dst[i] = FFABS(gx) + FFABS(gy);
dir[i] = get_rounded_direction(gx, gy);
}
}
}
void fn(gaussian_blur)(int w, int h,
uint8_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize, int src_stride)
{
pixel *srcp = (pixel *)src;
pixel *dstp = (pixel *)dst;
src_stride /= sizeof(pixel);
src_linesize /= sizeof(pixel);
dst_linesize /= sizeof(pixel);
memcpy(dstp, srcp, w*sizeof(pixel)); dstp += dst_linesize; srcp += src_linesize;
memcpy(dstp, srcp, w*sizeof(pixel)); dstp += dst_linesize; srcp += src_linesize;
for (int j = 2; j < h - 2; j++) {
dstp[0] = srcp[(0)*src_stride];
dstp[1] = srcp[(1)*src_stride];
for (int i = 2; i < w - 2; i++) {
/* Gaussian mask of size 5x5 with sigma = 1.4 */
dstp[i] = ((srcp[-2*src_linesize + (i-2)*src_stride] + srcp[2*src_linesize + (i-2)*src_stride]) * 2
+ (srcp[-2*src_linesize + (i-1)*src_stride] + srcp[2*src_linesize + (i-1)*src_stride]) * 4
+ (srcp[-2*src_linesize + (i )*src_stride] + srcp[2*src_linesize + (i )*src_stride]) * 5
+ (srcp[-2*src_linesize + (i+1)*src_stride] + srcp[2*src_linesize + (i+1)*src_stride]) * 4
+ (srcp[-2*src_linesize + (i+2)*src_stride] + srcp[2*src_linesize + (i+2)*src_stride]) * 2
+ (srcp[ -src_linesize + (i-2)*src_stride] + srcp[ src_linesize + (i-2)*src_stride]) * 4
+ (srcp[ -src_linesize + (i-1)*src_stride] + srcp[ src_linesize + (i-1)*src_stride]) * 9
+ (srcp[ -src_linesize + (i )*src_stride] + srcp[ src_linesize + (i )*src_stride]) * 12
+ (srcp[ -src_linesize + (i+1)*src_stride] + srcp[ src_linesize + (i+1)*src_stride]) * 9
+ (srcp[ -src_linesize + (i+2)*src_stride] + srcp[ src_linesize + (i+2)*src_stride]) * 4
+ srcp[(i-2)*src_stride] * 5
+ srcp[(i-1)*src_stride] * 12
+ srcp[(i )*src_stride] * 15
+ srcp[(i+1)*src_stride] * 12
+ srcp[(i+2)*src_stride] * 5) / 159;
}
dstp[w - 2] = srcp[(w - 2)*src_stride];
dstp[w - 1] = srcp[(w - 1)*src_stride];
dstp += dst_linesize;
srcp += src_linesize;
}
memcpy(dstp, srcp, w*sizeof(pixel)); dstp += dst_linesize; srcp += src_linesize;
memcpy(dstp, srcp, w*sizeof(pixel));
}
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