mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-29 10:52:20 +00:00
b389ff9a85
Reviewed-by: Martin Storsjö <martin@martin.st> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*
|
|
* Copyright (c) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
|
|
*
|
|
* 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 <stdint.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
|
|
#include "display.h"
|
|
#include "libm.h"
|
|
#include "mathematics.h"
|
|
|
|
// fixed point to double
|
|
#define CONV_FP(x) ((double) (x)) / (1 << 16)
|
|
|
|
// double to fixed point
|
|
#define CONV_DB(x) (int32_t) ((x) * (1 << 16))
|
|
|
|
double av_display_rotation_get(const int32_t matrix[9])
|
|
{
|
|
double rotation, scale[2];
|
|
|
|
scale[0] = hypot(CONV_FP(matrix[0]), CONV_FP(matrix[3]));
|
|
scale[1] = hypot(CONV_FP(matrix[1]), CONV_FP(matrix[4]));
|
|
|
|
if (scale[0] == 0.0 || scale[1] == 0.0)
|
|
return NAN;
|
|
|
|
rotation = atan2(CONV_FP(matrix[1]) / scale[1],
|
|
CONV_FP(matrix[0]) / scale[0]) * 180 / M_PI;
|
|
|
|
return -rotation;
|
|
}
|
|
|
|
void av_display_rotation_set(int32_t matrix[9], double angle)
|
|
{
|
|
double radians = -angle * M_PI / 180.0f;
|
|
double c = cos(radians);
|
|
double s = sin(radians);
|
|
|
|
memset(matrix, 0, 9 * sizeof(int32_t));
|
|
|
|
matrix[0] = CONV_DB(c);
|
|
matrix[1] = CONV_DB(-s);
|
|
matrix[3] = CONV_DB(s);
|
|
matrix[4] = CONV_DB(c);
|
|
matrix[8] = 1 << 30;
|
|
}
|
|
|
|
void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip)
|
|
{
|
|
int i;
|
|
const int flip[] = { 1 - 2 * (!!hflip), 1 - 2 * (!!vflip), 1 };
|
|
|
|
if (hflip || vflip)
|
|
for (i = 0; i < 9; i++)
|
|
matrix[i] *= flip[i % 3];
|
|
}
|