mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
91 lines
4.9 KiB
C
91 lines
4.9 KiB
C
/*
|
|
* Copyright (c) 2005 Robert Edele <yartrebo@earthlink.net>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "bbox.h"
|
|
|
|
#define BBOX(type, name) \
|
|
static int bbox_##name(FFBoundingBox *bbox, \
|
|
const type *data, int linesize, int w, int h, \
|
|
int min_val) \
|
|
{ \
|
|
int x, y; \
|
|
int start_x; \
|
|
int start_y; \
|
|
int end_x; \
|
|
int end_y; \
|
|
const type *line; \
|
|
\
|
|
/* left bound */ \
|
|
for (start_x = 0; start_x < w; start_x++) \
|
|
for (y = 0; y < h; y++) \
|
|
if ((data[y * linesize + start_x] > min_val)) \
|
|
goto outl; \
|
|
outl: \
|
|
if (start_x == w) /* no points found */ \
|
|
return 0; \
|
|
\
|
|
/* right bound */ \
|
|
for (end_x = w - 1; end_x >= start_x; end_x--) \
|
|
for (y = 0; y < h; y++) \
|
|
if ((data[y * linesize + end_x] > min_val)) \
|
|
goto outr; \
|
|
outr: \
|
|
\
|
|
/* top bound */ \
|
|
line = data; \
|
|
for (start_y = 0; start_y < h; start_y++) { \
|
|
for (x = 0; x < w; x++) \
|
|
if (line[x] > min_val) \
|
|
goto outt; \
|
|
line += linesize; \
|
|
} \
|
|
outt: \
|
|
\
|
|
/* bottom bound */ \
|
|
line = data + (h-1)*linesize; \
|
|
for (end_y = h - 1; end_y >= start_y; end_y--) { \
|
|
for (x = 0; x < w; x++) \
|
|
if (line[x] > min_val) \
|
|
goto outb; \
|
|
line -= linesize; \
|
|
} \
|
|
outb: \
|
|
\
|
|
bbox->x1 = start_x; \
|
|
bbox->y1 = start_y; \
|
|
bbox->x2 = end_x; \
|
|
bbox->y2 = end_y; \
|
|
return 1; \
|
|
}
|
|
|
|
BBOX(uint8_t, 8)
|
|
BBOX(uint16_t, 16)
|
|
|
|
int ff_calculate_bounding_box(FFBoundingBox *bbox,
|
|
const uint8_t *data, int linesize,
|
|
int w, int h,
|
|
int min_val, int depth)
|
|
{
|
|
if (depth <= 8)
|
|
return bbox_8(bbox, data, linesize, w, h, min_val);
|
|
else
|
|
return bbox_16(bbox, (const uint16_t *)data, linesize / 2, w, h, min_val);
|
|
}
|