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Diffstat (limited to 'redshift/colour.c')
| -rw-r--r-- | redshift/colour.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/redshift/colour.c b/redshift/colour.c new file mode 100644 index 0000000..4d85cb5 --- /dev/null +++ b/redshift/colour.c @@ -0,0 +1,97 @@ +/*- + * redshift-ng - Automatically adjust display colour temperature according the Sun + * + * Copyright (c) 2009-2018 Jon Lund Steffensen <jonlst@gmail.com> + * Copyright (c) 2014-2016, 2025 Mattias Andrée <m@maandree.se> + * + * 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/>. + */ +#include "common.h" + + +void +interpolate_colour_settings(const struct colour_setting *a, const struct colour_setting *b, + double t, struct colour_setting *result) +{ + int i; + t = CLAMP(0.0, t, 1.0); + result->temperature = (1.0 - t) * a->temperature + t * b->temperature; + result->brightness = (1.0 - t) * a->brightness + t * b->brightness; + for (i = 0; i < 3; i++) + result->gamma[i] = (1.0 - t) * a->gamma[i] + t * b->gamma[i]; +} + + +int +colour_setting_diff_is_major(const struct colour_setting *a, const struct colour_setting *b) +{ + return MAX(a->temperature, b->temperature) - MIN(a->temperature, b->temperature) > 25UL || + fabs(a->brightness - b->brightness) > 0.1 || + fabs(a->gamma[0] - b->gamma[0]) > 0.1 || + fabs(a->gamma[1] - b->gamma[1]) > 0.1 || + fabs(a->gamma[2] - b->gamma[2]) > 0.1; +} + + +#define X(SUFFIX, RAMPS, TYPE, MAX, DEPTH)\ + /** + * Fill a gamma ramp + * + * @param ramp The gamma ramp + * @param saved Saved gamma ramp with calibrations to preserver, or `NULL` + * @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, const TYPE *saved, size_t size, double brightness, double gamma)\ + {\ + size_t i;\ + double v;\ + brightness /= (size - 1U);\ + if (exact_eq(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;\ + }\ + }\ + if (saved) {\ + for (i = 0; i < size; i++) {\ + v = (double)ramp[i] / (MAX) * (size - 1U);\ + ramp[i] = saved[(size_t)v];\ + }\ + }\ + }\ + \ + void\ + fill_ramps_##SUFFIX(TYPE *gamma_r, TYPE *gamma_g, TYPE *gamma_b,\ + const TYPE *saved_r, const TYPE *saved_g, const TYPE *saved_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, saved_r, size_r, setting->brightness * r, setting->gamma[0]);\ + fill_ramp_##SUFFIX(gamma_g, saved_g, size_g, setting->brightness * g, setting->gamma[1]);\ + fill_ramp_##SUFFIX(gamma_b, saved_b, size_b, setting->brightness * b, setting->gamma[2]);\ + } + +LIST_RAMPS_STOP_VALUE_TYPES(X,) |