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/*-
* 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"
#include <ApplicationServices/ApplicationServices.h>
struct quartz_display_state {
CGDirectDisplayID display;
uint32_t ramp_size;
float *saved_ramps;
};
struct gamma_state {
struct quartz_display_state *displays;
uint32_t display_count;
};
static int
quartz_create(struct gamma_state **state_out)
{
*state_out = emalloc(sizeof(**state_out));
(*state_out)->displays = NULL;
return 0;
}
static int
quartz_start(struct gamma_state *state)
{
float *gamma_r, *gamma_g, *gamma_b;
uint32_t i, display_count, ramp_size, sample_count;
CGDirectDisplayID *displays, display;
CGError error;
/* Get display count */
error = CGGetOnlineDisplayList(0, NULL, &display_count);
if (error != kCGErrorSuccess)
return -1;
state->display_count = display_count;
displays = emalloc(sizeof(CGDirectDisplayID) * display_count);
/* Get list of displays */
error = CGGetOnlineDisplayList(display_count, displays, &display_count);
if (error != kCGErrorSuccess) {
free(displays);
return -1;
}
/* Allocate list of display state */
state->displays = emalloc(display_count * sizeof(struct quartz_display_state));
/* Copy display indentifiers to display state */
for (i = 0; i < display_count; i++) {
state->displays[i].display = displays[i];
state->displays[i].saved_ramps = NULL;
}
free(displays);
/* Save gamma ramps for all displays in display state */
for (i = 0; i < display_count; i++) {
display = state->displays[i].display;
ramp_size = CGDisplayGammaTableCapacity(display);
if (!ramp_size) {
weprintf(_("Gamma ramp size too small: %zu"), (size_t)ramp_size);
return -1;
}
state->displays[i].ramp_size = ramp_size;
/* Allocate space for saved ramps */
state->displays[i].saved_ramps = emalloc(3 * ramp_size * sizeof(float));
gamma_r = &state->displays[i].saved_ramps[0 * ramp_size];
gamma_g = &state->displays[i].saved_ramps[1 * ramp_size];
gamma_b = &state->displays[i].saved_ramps[2 * ramp_size];
/* Copy the ramps to allocated space */
error = CGGetDisplayTransferByTable(display, ramp_size, gamma_r, gamma_g, gamma_b, &sample_count);
if (error != kCGErrorSuccess || sample_count != ramp_size) {
weprintf(_("Unable to save current gamma ramp."));
return -1;
}
}
return 0;
}
static void
quartz_restore(struct gamma_state *state)
{
CGDisplayRestoreColorSyncSettings();
}
static void
quartz_free(struct gamma_state *state)
{
uint32_t i;
if (state->displays)
for (i = 0; i < state->display_count; i++)
free(state->displays[i].saved_ramps);
free(state->displays);
free(state);
}
static void
quartz_print_help(FILE *f)
{
fputs(_("Adjust gamma ramps on macOS using Quartz.\n"), f);
fputs("\n", f);
}
static int
quartz_set_option(struct gamma_state *state, const char *key, const char *value)
{
if (!strcasecmp(key, "preserve")) {
weprintf(_("Parameter `%s' is now always on; use the `%s' command-line option to disable."), key, "-P");
} else {
weprintf(_("Unknown method parameter: `%s'."), key);
return -1;
}
return 0;
}
static void
quartz_apply_for_display(struct gamma_state *state, int display_index, const colour_setting_t *setting, int preserve)
{
float *gamma_ramps, *gamma_r, *gamma_g, *gamma_b, value;
CGDirectDisplayID display = state->displays[display_index].display;
uint32_t ramp_size = state->displays[display_index].ramp_size;
CGError error;
uint32_t i;
/* Create new gamma ramps */
gamma_ramps = emalloc(3 * ramp_size * sizeof(float));
gamma_r = &gamma_ramps[0 * ramp_size];
gamma_g = &gamma_ramps[1 * ramp_size];
gamma_b = &gamma_ramps[2 * ramp_size];
if (preserve) {
/* Initialize gamma ramps from saved state */
memcpy(gamma_ramps, state->displays[display_index].saved_ramps, 3 * ramp_size * sizeof(float));
} else {
/* Initialize gamma ramps to pure state */
for (i = 0; i < ramp_size; i++) {
value = (float)i / ramp_size;
gamma_r[i] = value;
gamma_g[i] = value;
gamma_b[i] = value;
}
}
fill_ramps_float(gamma_r, gamma_g, gamma_b, ramp_size, ramp_size, ramp_size, setting);
error = CGSetDisplayTransferByTable(display, ramp_size, gamma_r, gamma_g, gamma_b);
if (error != kCGErrorSuccess) {
free(gamma_ramps);
return;
}
free(gamma_ramps);
}
static int
quartz_apply(struct gamma_state *state, const colour_setting_t *setting, int preserve)
{
uint32_t i;
for (i = 0; i < state->display_count; i++)
quartz_apply_for_display(state, i, setting, preserve);
return 0;
}
const struct gamma_method quartz_gamma_method = GAMMA_METHOD_INIT("quartz", 1, 1, quartz);
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