mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-15 11:44:49 +00:00
53c896770c
Signed-off-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
76 lines
2.1 KiB
C
76 lines
2.1 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"
|
|
|
|
int ff_calculate_bounding_box(FFBoundingBox *bbox,
|
|
const uint8_t *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 uint8_t *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;
|
|
}
|