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/*
* 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 AVFILTER_PRESERVE_COLOR_H
#define AVFILTER_PRESERVE_COLOR_H
#include <math.h>
#include "libavutil/macros.h"
enum {
P_NONE,
P_LUM,
P_MAX,
P_AVG,
P_SUM,
P_NRM,
P_PWR,
NB_PRESERVE
};
static inline float normalize(float r, float g, float b, float max)
{
r /= max;
g /= max;
b /= max;
return sqrtf(r * r + g * g + b * b);
}
static inline float power(float r, float g, float b, float max)
{
r /= max;
g /= max;
b /= max;
return cbrtf(r * r * r + g * g * g + b * b * b);
}
static inline void preserve_color(int preserve_color,
float ir, float ig, float ib,
float r, float g, float b,
float max,
float *icolor, float *ocolor)
{
switch (preserve_color) {
case P_LUM:
*icolor = FFMAX3(ir, ig, ib) + FFMIN3(ir, ig, ib);
*ocolor = FFMAX3( r, g, b) + FFMIN3( r, g, b);
break;
case P_MAX:
*icolor = FFMAX3(ir, ig, ib);
*ocolor = FFMAX3( r, g, b);
break;
case P_AVG:
*icolor = (ir + ig + ib + 1.f) / 3.f;
*ocolor = ( r + g + b + 1.f) / 3.f;
break;
case P_SUM:
*icolor = ir + ig + ib;
*ocolor = r + g + b;
break;
case P_NRM:
*icolor = normalize(ir, ig, ib, max);
*ocolor = normalize( r, g, b, max);
break;
case P_PWR:
*icolor = power(ir, ig, ib, max);
*ocolor = power( r, g, b, max);
break;
}
}
#endif /* AVFILTER_PRESERVE_COLOR_H */
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