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/* colorramp.c -- color temperature calculation source
This file is part of Redshift.
Redshift is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Redshift 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Redshift. If not, see <http://www.gnu.org/licenses/>.
Copyright (c) 2013, 2014 Jon Lund Steffensen <jonlst@gmail.com>
Copyright (c) 2013 Ingo Thies <ithies@astro.uni-bonn.de> [historical, no longer applies]
Copyright (c) 2016, 2025 Mattias Andrée <m@maandree.se>
*/
#include <stdint.h>
#include <math.h>
#include <libred.h>
#include "colorramp.h"
#include "redshift.h"
/* Helper macro used in the fill functions */
#define F(Y, WP, C) pow((Y) * setting->brightness * (WP), 1.0/setting->gamma[C])
#define X(SUFFIX, TYPE, MAX, TRUE_MAX, DEPTH)\
void\
colorramp_fill_##SUFFIX(TYPE *gamma_r, TYPE *gamma_g, TYPE *gamma_b,\
size_t size_r, size_t size_g, size_t size_b,\
const color_setting_t *setting)\
{\
double r = 1, g = 1, b = 1;\
size_t i;\
libred_get_colour(setting->temperature, &r, &g, &b);\
for (i = 0; i < size_r; i++) gamma_r[i] = F((double)i / size_r, r, 0) * (MAX);\
for (i = 0; i < size_g; i++) gamma_g[i] = F((double)i / size_g, g, 1) * (MAX);\
for (i = 0; i < size_b; i++) gamma_b[i] = F((double)i / size_b, b, 2) * (MAX);\
}
LIST_RAMPS_STOP_VALUE_TYPES
#undef X
#undef F
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