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/* colourramp.c -- colour temperature calculation source
* This file is part of redshift-ng.
*
* redshift-ng 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-ng 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-ng. 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 "common.h"
#if defined(__GNUC__)
# pragma GCC diagnostic ignored "-Wfloat-equal"
#endif
#define X(SUFFIX, TYPE, MAX, DEPTH)\
/**
* Fill a gamma ramp
*
* @param ramp The gamma ramp
* @param size The gamma ramp size (number of stops)
* @param brightness The brightness (between 0 and 1) of the channel, which is
* the overall applied brightness multiplied but the effect
* on the channel from the colour temperature
* @param gamma The gamma to apply to the channel
*/\
static void\
fill_ramp_##SUFFIX(TYPE *ramp, size_t size, double brightness, double gamma)\
{\
size_t i;\
double v;\
brightness /= (size - 1U);\
if (gamma == 1.0) {\
brightness *= (MAX);\
for (i = 0; i < size; i++)\
ramp[i] = (TYPE)(i * brightness);\
} else {\
gamma = 1.0 / gamma;\
for (i = 0; i < size; i++) {\
v = pow(i * brightness, gamma) * (MAX);\
ramp[i] = (TYPE)v;\
}\
}\
}\
\
void\
colourramp_fill_##SUFFIX(TYPE *gamma_r, TYPE *gamma_g, TYPE *gamma_b,\
size_t size_r, size_t size_g, size_t size_b,\
const struct colour_setting *setting)\
{\
double r = 1, g = 1, b = 1;\
libred_get_colour(setting->temperature, &r, &g, &b);\
fill_ramp_##SUFFIX(gamma_r, size_r, setting->brightness * r, setting->gamma[0]);\
fill_ramp_##SUFFIX(gamma_g, size_g, setting->brightness * g, setting->gamma[1]);\
fill_ramp_##SUFFIX(gamma_b, size_b, setting->brightness * b, setting->gamma[2]);\
}
LIST_RAMPS_STOP_VALUE_TYPES(X,)
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