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/* gamma-quartz.c -- Quartz (OSX) gamma adjustment
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) 2014 Jon Lund Steffensen <jonlst@gmail.com>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ApplicationServices/ApplicationServices.h>
#ifdef ENABLE_NLS
# include <libintl.h>
# define _(s) gettext(s)
#else
# define _(s) s
#endif
#include "gamma-quartz.h"
#include "colorramp.h"
int
quartz_init(quartz_state_t *state)
{
state->preserve = 0;
state->displays = NULL;
return 0;
}
int
quartz_start(quartz_state_t *state)
{
int r;
CGError error;
uint32_t display_count;
/* Get display count */
error = CGGetOnlineDisplayList(0, NULL, &display_count);
if (error != kCGErrorSuccess) return -1;
state->display_count = display_count;
CGDirectDisplayID* displays =
malloc(sizeof(CGDirectDisplayID)*display_count);
if (displays == NULL) {
perror("malloc");
return -1;
}
/* 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 = malloc(display_count *
sizeof(quartz_display_state_t));
if (state->displays == NULL) {
perror("malloc");
free(displays);
return -1;
}
/* Copy display indentifiers to display state */
for (int 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 (int i = 0; i < display_count; i++) {
CGDirectDisplayID display = state->displays[i].display;
uint32_t ramp_size = CGDisplayGammaTableCapacity(display);
if (ramp_size == 0) {
fprintf(stderr, _("Gamma ramp size too small: %i\n"),
ramp_size);
return -1;
}
state->displays[i].ramp_size = ramp_size;
/* Allocate space for saved ramps */
state->displays[i].saved_ramps =
malloc(3 * ramp_size * sizeof(float));
if (state->displays[i].saved_ramps == NULL) {
perror("malloc");
return -1;
}
float *gamma_r = &state->displays[i].saved_ramps[0*ramp_size];
float *gamma_g = &state->displays[i].saved_ramps[1*ramp_size];
float *gamma_b = &state->displays[i].saved_ramps[2*ramp_size];
/* Copy the ramps to allocated space */
uint32_t sample_count;
error = CGGetDisplayTransferByTable(display, ramp_size,
gamma_r, gamma_g, gamma_b,
&sample_count);
if (error != kCGErrorSuccess ||
sample_count != ramp_size) {
fputs(_("Unable to save current gamma ramp.\n"),
stderr);
return -1;
}
}
return 0;
}
void
quartz_restore(quartz_state_t *state)
{
CGDisplayRestoreColorSyncSettings();
}
void
quartz_free(quartz_state_t *state)
{
if (state->displays != NULL) {
for (int i = 0; i < state->display_count; i++) {
free(state->displays[i].saved_ramps);
}
}
free(state->displays);
}
void
quartz_print_help(FILE *f)
{
fputs(_("Adjust gamma ramps on OSX using Quartz.\n"), f);
fputs("\n", f);
/* TRANSLATORS: Quartz help output
left column must not be translated */
fputs(_(" preserve={0,1}\tWhether existing gamma should be"
" preserved\n"),
f);
fputs("\n", f);
}
int
quartz_set_option(quartz_state_t *state, const char *key, const char *value)
{
if (strcasecmp(key, "preserve") == 0) {
state->preserve = atoi(value);
} else {
fprintf(stderr, _("Unknown method parameter: `%s'.\n"), key);
return -1;
}
return 0;
}
static void
quartz_set_temperature_for_display(quartz_state_t *state, int display,
const color_setting_t *setting)
{
uint32_t ramp_size = state->displays[display].ramp_size;
/* Create new gamma ramps */
float *gamma_ramps = malloc(3*ramp_size*sizeof(float));
if (gamma_ramps == NULL) {
perror("malloc");
return;
}
float *gamma_r = &gamma_ramps[0*ramp_size];
float *gamma_g = &gamma_ramps[1*ramp_size];
float *gamma_b = &gamma_ramps[2*ramp_size];
if (state->preserve) {
/* Initialize gamma ramps from saved state */
memcpy(gamma_ramps, state->displays[display].saved_ramps,
3*ramp_size*sizeof(float));
} else {
/* Initialize gamma ramps to pure state */
for (int i = 0; i < ramp_size; i++) {
float value = (double)i/ramp_size;
gamma_r[i] = value;
gamma_g[i] = value;
gamma_b[i] = value;
}
}
colorramp_fill_float(gamma_r, gamma_g, gamma_b, ramp_size,
setting);
CGError error =
CGSetDisplayTransferByTable(display, ramp_size,
gamma_r, gamma_g, gamma_b);
if (error != kCGErrorSuccess) {
free(gamma_ramps);
return;
}
free(gamma_ramps);
}
int
quartz_set_temperature(quartz_state_t *state,
const color_setting_t *setting)
{
for (int i = 0; i < state->display_count; i++) {
quartz_set_temperature_for_display(state, i, setting);
}
return 0;
}
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