Add Quartz (OSX) gamma adjustment method

1 files changed, 146 insertions, 0 deletions

diff --git a/src/gamma-quartz.c b/src/gamma-quartz.c
new file mode 100644
index 0000000..2f439da
--- /dev/null
+++ b/src/gamma-quartz.c
@@ -0,0 +1,146 @@
+/* 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)
+{
+	return 0;
+}
+
+int
+quartz_start(quartz_state_t *state)
+{
+	return 0;
+}
+
+void
+quartz_restore(quartz_state_t *state)
+{
+	CGDisplayRestoreColorSyncSettings();
+}
+
+void
+quartz_free(quartz_state_t *state)
+{
+}
+
+void
+quartz_print_help(FILE *f)
+{
+	fputs(_("Adjust gamma ramps on OSX using Quartz.\n"), f);
+	fputs("\n", f);
+}
+
+int
+quartz_set_option(quartz_state_t *state, const char *key, const char *value)
+{
+	fprintf(stderr, _("Unknown method parameter: `%s'.\n"), key);
+	return -1;
+}
+
+static void
+quartz_set_temperature_for_display(CGDirectDisplayID display, int temp,
+				   float brightness, const float gamma[3])
+{
+	uint32_t ramp_size = CGDisplayGammaTableCapacity(display);
+	if (ramp_size == 0) {
+		fprintf(stderr, _("Gamma ramp size too small: %i\n"),
+			ramp_size);
+		return;
+	}
+
+	/* 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];
+
+	colorramp_fill_float(gamma_r, gamma_g, gamma_b, ramp_size,
+			     temp, brightness, gamma);
+
+	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, int temp, float brightness,
+		       const float gamma[3])
+{
+	int r;
+	CGError error;
+	uint32_t display_count;
+
+	error = CGGetOnlineDisplayList(0, NULL, &display_count);
+	if (error != kCGErrorSuccess) return -1;
+
+	CGDirectDisplayID* displays =
+		malloc(sizeof(CGDirectDisplayID)*display_count);
+	if (displays == NULL) {
+		perror("malloc");
+		return -1;
+	}
+
+	error = CGGetOnlineDisplayList(display_count, displays,
+				       &display_count);
+	if (error != kCGErrorSuccess) {
+		free(displays);
+		return -1;
+	}
+
+	for (int i = 0; i < display_count; i++) {
+		quartz_set_temperature_for_display(displays[i], temp,
+						   brightness, gamma);
+	}
+
+	free(displays);
+
+	return 0;
+}