From e519851bf6efde1b1709610e87dc16d98a868c0c Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sat, 8 Mar 2025 16:08:53 +0100 Subject: style MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/colourramp.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 src/colourramp.c (limited to 'src/colourramp.c') diff --git a/src/colourramp.c b/src/colourramp.c new file mode 100644 index 0000000..1aa7f27 --- /dev/null +++ b/src/colourramp.c @@ -0,0 +1,70 @@ +/* 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 . + * + * Copyright (c) 2013, 2014 Jon Lund Steffensen + * Copyright (c) 2013 Ingo Thies [historical, no longer applies] + * Copyright (c) 2016, 2025 Mattias Andrée + */ +#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,) -- cgit v1.2.3-70-g09d2