Merge pull request #140 from jonls/osx-support

OSX support. Adds gamma adjustment method `quartz` and location provider `corelocation`.

10 files changed, 582 insertions, 5 deletions

diff --git a/configure.ac b/configure.ac
index 1bb5424..3f46334 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,14 +5,31 @@ AC_PREREQ([2.69])
 AC_INIT([redshift], [1.9.1], [https://github.com/jonls/redshift/issues])
 AC_CONFIG_SRCDIR([src/redshift.c])
 AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([foreign subdir-objects dist-xz])
 
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 # Checks for programs.
 AC_PROG_CC_C99
+AC_PROG_LIBTOOL
+AC_PROG_OBJC # For OSX support modules
+AC_LANG([C])
+
 AC_PROG_INTLTOOL([0.50])
 
+# Test whether Objective C compiler works
+AC_MSG_CHECKING([whether Objective C compiler works])
+AC_LANG_PUSH([Objective C])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], [
+	AC_MSG_RESULT([yes])
+	have_objc_compiler=yes
+], [
+	AC_MSG_RESULT([no])
+	have_objc_compiler=no
+])
+AC_LANG_POP([Objective C])
+
 # Checks for libraries.
 AM_GNU_GETTEXT_VERSION([0.17])
 AM_GNU_GETTEXT([external])
@@ -34,6 +51,30 @@ PKG_CHECK_MODULES([GLIB], [glib-2.0 gobject-2.0], [have_glib=yes], [have_glib=no
 PKG_CHECK_MODULES([GEOCLUE], [geoclue], [have_geoclue=yes], [have_geoclue=no])
 PKG_CHECK_MODULES([GEOCLUE2], [glib-2.0 gio-2.0 >= 2.26], [have_geoclue2=yes], [have_geoclue2=no])
 
+# OSX headers
+AC_CHECK_HEADER([ApplicationServices/ApplicationServices.h], [have_appserv_h=yes], [have_appserv_h=no])
+
+# CoreLocation.h is an Objective C header. Only test if
+# Objective C compiler works. AC_CHECK_HEADER does not
+# appear to work if the Ojective C compiler is not
+# available so we need a custom test.
+AC_MSG_CHECKING([whether CoreLocation/CoreLocation.h is usable])
+AS_IF([test "x$have_objc_compiler" = xyes], [
+	AC_LANG_PUSH([Objective C])
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#import <CoreLocation/CoreLocation.h>]],[[]])], [
+		AC_MSG_RESULT([yes])
+		have_corelocation_h=yes
+	], [
+		AC_MSG_RESULT([no])
+		have_corelocation_h=no
+	])
+	AC_LANG_POP([Objective C])
+], [
+	AC_MSG_RESULT([no Objective C compiler available])
+	have_corelocation_h=no
+])
+
+# Windows header
 AC_CHECK_HEADER([windows.h], [have_windows_h=yes], [have_windows_h=no])
 
 # Check for Python
@@ -111,6 +152,34 @@ AS_IF([test "x$enable_vidmode" != xno], [
 ])
 AM_CONDITIONAL([ENABLE_VIDMODE], [test "x$enable_vidmode" = xyes])
 
+# Check Quartz (OSX) method
+AC_MSG_CHECKING([whether to enable Quartz method])
+AC_ARG_ENABLE([quartz], [AC_HELP_STRING([--enable-quartz],
+	[enable Quartz (OSX) method])],
+	[enable_quartz=$enableval],[enable_quartz=maybe])
+AS_IF([test "x$enable_quartz" != xno], [
+	AS_IF([test $have_appserv_h = yes], [
+		QUARTZ_CFLAGS=""
+		QUARTZ_LIBS="-framework ApplicationServices"
+		AC_DEFINE([ENABLE_QUARTZ], 1,
+			[Define to 1 to enable Quartz method])
+		AC_MSG_RESULT([yes])
+		enable_quartz=yes
+	], [
+		AC_MSG_RESULT([missing dependencies])
+		AS_IF([test "x$enable_quartz" = xyes], [
+			AC_MSG_ERROR([missing Quartz headers])
+		])
+		enable_quartz=no
+	])
+], [
+	AC_MSG_RESULT([no])
+	enable_quartz=no
+])
+AM_CONDITIONAL([ENABLE_QUARTZ], [test "x$enable_quartz" = xyes])
+AC_SUBST([QUARTZ_CFLAGS])
+AC_SUBST([QUARTZ_LIBS])
+
 # Check Windows GDI method 
 AC_MSG_CHECKING([whether to enable WinGDI method])
 AC_ARG_ENABLE([wingdi], [AC_HELP_STRING([--enable-wingdi],
@@ -184,6 +253,34 @@ AS_IF([test "x$enable_geoclue2" != xno], [
 ])
 AM_CONDITIONAL([ENABLE_GEOCLUE2], [test "x$enable_geoclue2" = xyes])
 
+# Check CoreLocation (OSX) provider
+AC_MSG_CHECKING([whether to enable CoreLocation method])
+AC_ARG_ENABLE([corelocation], [AC_HELP_STRING([--enable-corelocation],
+	[enable CoreLocation (OSX) provider])],
+	[enable_corelocation=$enableval],[enable_corelocation=maybe])
+AS_IF([test "x$enable_corelocation" != xno], [
+	AS_IF([test "x$have_corelocation_h" = xyes], [
+		CORELOCATION_CFLAGS=""
+		CORELOCATION_LIBS="-framework Foundation -framework CoreLocation"
+		AC_DEFINE([ENABLE_CORELOCATION], 1,
+			[Define to 1 to enable CoreLocation provider])
+		AC_MSG_RESULT([yes])
+		enable_corelocation=yes
+	], [
+		AC_MSG_RESULT([missing dependencies])
+		AS_IF([test "x$enable_corelocation" = xyes], [
+			AC_MSG_ERROR([missing CoreLocation headers])
+		])
+		enable_corelocation=no
+	])
+], [
+	AC_MSG_RESULT([no])
+	enable_corelocation=no
+])
+AM_CONDITIONAL([ENABLE_CORELOCATION], [test "x$enable_corelocation" = xyes])
+AC_SUBST([CORELOCATION_CFLAGS])
+AC_SUBST([CORELOCATION_LIBS])
+
 
 # Check for GUI status icon
 AC_MSG_CHECKING([whether to enable GUI status icon])
@@ -270,11 +367,13 @@ echo "
     DRM:		${enable_drm}
     RANDR:		${enable_randr}
     VidMode:		${enable_vidmode}
-    WinGDI:		${enable_wingdi}
+    Quartz (OSX):	${enable_quartz}
+    WinGDI (Windows):	${enable_wingdi}
 
     Location providers:
     Geoclue:		${enable_geoclue}
     Geoclue2:		${enable_geoclue2}
+    CoreLocation (OSX)	${enable_corelocation}
 
     GUI:		${enable_gui}
     Ubuntu icons:	${enable_ubuntu}
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 7cdb757..ffaddb2 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -10,11 +10,13 @@ src/config-ini.c
 src/gamma-drm.c
 src/gamma-randr.c
 src/gamma-vidmode.c
+src/gamma-quartz.c
 src/gamma-w32gdi.c
 src/gamma-dummy.c
 
 src/location-geoclue.c
 src/location-geoclue2.c
+src/location-corelocation.m
 src/location-manual.c
 
 src/redshift-gtk/statusicon.py
diff --git a/src/Makefile.am b/src/Makefile.am
index eca9217..8d11a03 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -21,6 +21,7 @@ EXTRA_redshift_SOURCES = \
 	gamma-drm.c gamma-drm.h \
 	gamma-randr.c gamma-randr.h \
 	gamma-vidmode.c gamma-vidmode.h \
+	gamma-quartz.c gamma-quartz.h \
 	gamma-w32gdi.c gamma-w32gdi.h \
 	location-geoclue.c location-geoclue.h
 
@@ -51,6 +52,13 @@ redshift_LDADD += \
 	$(XF86VM_LIBS) $(XF86VM_CFLAGS)
 endif
 
+if ENABLE_QUARTZ
+redshift_SOURCES += gamma-quartz.c gamma-quartz.h
+AM_CFLAGS += $(QUARTZ_CFLAGS)
+redshift_LDADD += \
+	$(QUARTZ_LIBS) $(QUARTZ_CFLAGS)
+endif
+
 if ENABLE_WINGDI
 redshift_SOURCES += gamma-w32gdi.c gamma-w32gdi.h
 redshift_LDADD += -lgdi32
@@ -74,3 +82,18 @@ AM_CFLAGS += \
 redshift_LDADD += \
 	$(GEOCLUE2_LIBS) $(GEOCLUE2_CFLAGS)
 endif
+
+# Build CoreLocation module as a separate convenience
+# library since it is using a separate compiler
+# (Objective C).
+
+if ENABLE_CORELOCATION
+noinst_LTLIBRARIES = liblocation-corelocation.la
+liblocation_corelocation_la_SOURCES = \
+	location-corelocation.m location-corelocation.h
+liblocation_corelocation_la_OBJCFLAGS = \
+	$(CORELOCATION_CFLAGS)
+liblocation_corelocation_la_LIBADD = \
+	$(CORELOCATION_CFLAGS) $(CORELOCATION_LIBS)
+redshift_LDADD += liblocation-corelocation.la
+endif
diff --git a/src/colorramp.c b/src/colorramp.c
index f1988d4..3521195 100644
--- a/src/colorramp.c
+++ b/src/colorramp.c
@@ -14,7 +14,7 @@
    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) 2013  Jon Lund Steffensen <jonlst@gmail.com>
+   Copyright (c) 2013-2014  Jon Lund Steffensen <jonlst@gmail.com>
    Copyright (c) 2013  Ingo Thies <ithies@astro.uni-bonn.de>
 */
 
@@ -280,6 +280,9 @@ interpolate_color(float a, const float *c1, const float *c2, float *c)
 	c[2] = (1.0-a)*c1[2] + a*c2[2];
 }
 
+/* Helper macro used in the fill functions */
+#define F(Y, C)  pow((Y) * brightness * white_point[C], 1.0/gamma[C])
+
 void
 colorramp_fill(uint16_t *gamma_r, uint16_t *gamma_g, uint16_t *gamma_b,
 	       int size, int temp, float brightness, const float gamma[3])
@@ -291,11 +294,30 @@ colorramp_fill(uint16_t *gamma_r, uint16_t *gamma_g, uint16_t *gamma_b,
 	interpolate_color(alpha, &blackbody_color[temp_index],
 			  &blackbody_color[temp_index+3], white_point);
 
-#define F(Y, C)  pow((Y) * brightness * white_point[C], 1.0/gamma[C])
-
 	for (int i = 0; i < size; i++) {
 		gamma_r[i] = F((float)i/size, 0) * (UINT16_MAX+1);
 		gamma_g[i] = F((float)i/size, 1) * (UINT16_MAX+1);
 		gamma_b[i] = F((float)i/size, 2) * (UINT16_MAX+1);
 	}
 }
+
+void
+colorramp_fill_float(float *gamma_r, float *gamma_g, float *gamma_b,
+		     int size, int temp, float brightness,
+		     const float gamma[3])
+{
+	/* Approximate white point */
+	float white_point[3];
+	float alpha = (temp % 100) / 100.0;
+	int temp_index = ((temp - 1000) / 100)*3;
+	interpolate_color(alpha, &blackbody_color[temp_index],
+			  &blackbody_color[temp_index+3], white_point);
+
+	for (int i = 0; i < size; i++) {
+		gamma_r[i] = F((float)i/size, 0);
+		gamma_g[i] = F((float)i/size, 1);
+		gamma_b[i] = F((float)i/size, 2);
+	}
+}
+
+#undef F
diff --git a/src/colorramp.h b/src/colorramp.h
index dd0fa97..f8df478 100644
--- a/src/colorramp.h
+++ b/src/colorramp.h
@@ -14,7 +14,7 @@
    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) 2010  Jon Lund Steffensen <jonlst@gmail.com>
+   Copyright (c) 2010-2014  Jon Lund Steffensen <jonlst@gmail.com>
 */
 
 #ifndef REDSHIFT_COLORRAMP_H
@@ -24,5 +24,8 @@
 
 void colorramp_fill(uint16_t *gamma_r, uint16_t *gamma_g, uint16_t *gamma_b,
 		    int size, int temp, float brightness, const float gamma[3]);
+void colorramp_fill_float(float *gamma_r, float *gamma_g, float *gamma_b,
+			  int size, int temp, float brightness,
+			  const float gamma[3]);
 
 #endif /* ! REDSHIFT_COLORRAMP_H */
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;
+}
diff --git a/src/gamma-quartz.h b/src/gamma-quartz.h
new file mode 100644
index 0000000..c8bfef7
--- /dev/null
+++ b/src/gamma-quartz.h
@@ -0,0 +1,44 @@
+/* gamma-quartz.h -- Quartz (OSX) gamma adjustment header
+   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>
+*/
+
+#ifndef REDSHIFT_GAMMA_QUARTZ_H
+#define REDSHIFT_GAMMA_QUARTZ_H
+
+#include "redshift.h"
+
+
+typedef struct {
+	int dummy;
+} quartz_state_t;
+
+
+int quartz_init(quartz_state_t *state);
+int quartz_start(quartz_state_t *state);
+void quartz_free(quartz_state_t *state);
+
+void quartz_print_help(FILE *f);
+int quartz_set_option(quartz_state_t *state, const char *key,
+		      const char *value);
+
+void quartz_restore(quartz_state_t *state);
+int quartz_set_temperature(quartz_state_t *state, int temp, float brightness,
+			   const float gamma[3]);
+
+
+#endif /* ! REDSHIFT_GAMMA_QUARTZ_H */
diff --git a/src/location-corelocation.h b/src/location-corelocation.h
new file mode 100644
index 0000000..58dddd7
--- /dev/null
+++ b/src/location-corelocation.h
@@ -0,0 +1,38 @@
+/* location-corelocation.h -- CoreLocation (OSX) location provider header
+   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 Steffense <jonlst@gmail.com>
+*/
+
+#ifndef REDSHIFT_LOCATION_CORELOCATION_H
+#define REDSHIFT_LOCATION_CORELOCATION_H
+
+#include <stdio.h>
+
+
+int location_corelocation_init(void *state);
+int location_corelocation_start(void *state);
+void location_corelocation_free(void *state);
+
+void location_corelocation_print_help(FILE *f);
+int location_corelocation_set_option(void *state,
+				     const char *key, const char *value);
+
+int location_corelocation_get_location(void *state,
+				       float *lat, float *lon);
+
+
+#endif /* ! REDSHIFT_LOCATION_CORELOCATION_H */
diff --git a/src/location-corelocation.m b/src/location-corelocation.m
new file mode 100644
index 0000000..626949c
--- /dev/null
+++ b/src/location-corelocation.m
@@ -0,0 +1,163 @@
+/* location-corelocation.m -- CoreLocation (OSX) location provider source
+   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
+
+#import <Foundation/Foundation.h>
+#import <CoreLocation/CoreLocation.h>
+
+#include "location-corelocation.h"
+
+#include <stdio.h>
+
+#ifdef ENABLE_NLS
+# include <libintl.h>
+# define _(s) gettext(s)
+#else
+# define _(s) s
+#endif
+
+
+@interface Delegate : NSObject <CLLocationManagerDelegate>
+@property (strong, nonatomic) CLLocationManager *locationManager;
+@property (nonatomic) BOOL success;
+@property (nonatomic) float latitude;
+@property (nonatomic) float longitude;
+@end
+
+@implementation Delegate;
+
+- (void)start
+{
+	self.locationManager = [[CLLocationManager alloc] init];
+	self.locationManager.delegate = self;
+
+	CLAuthorizationStatus authStatus =
+		[CLLocationManager authorizationStatus];
+
+	if (authStatus != kCLAuthorizationStatusNotDetermined &&
+	    authStatus != kCLAuthorizationStatusAuthorized) {
+		fputs(_("Not authorized to obtain location"
+			"from CoreLocation.\n"), stderr);
+		CFRunLoopStop(CFRunLoopGetCurrent());
+	}
+
+	[self.locationManager startUpdatingLocation];
+}
+
+- (void)stop
+{
+	[self.locationManager stopUpdatingLocation];
+	CFRunLoopStop(CFRunLoopGetCurrent());
+}
+
+- (void)locationManager:(CLLocationManager *)manager
+     didUpdateLocations:(NSArray *)locations
+{
+	CLLocation *newLocation = [locations firstObject];
+	self.latitude = newLocation.coordinate.latitude;
+	self.longitude = newLocation.coordinate.longitude;
+	self.success = YES;
+
+	[self stop];
+}
+
+- (void)locationManager:(CLLocationManager *)manager
+       didFailWithError:(NSError *)error
+{
+	fprintf(stderr, _("Error obtaining location from CoreLocation: %s\n"),
+	       [[error localizedDescription] UTF8String]);
+	[self stop];
+}
+
+- (void)locationManager:(CLLocationManager *)manager
+       didChangeAuthorizationStatus:(CLAuthorizationStatus)status
+{
+	if (status == kCLAuthorizationStatusNotDetermined) {
+		fputs(_("Waiting for authorization to obtain location...\n"),
+		      stderr);
+	} else if (status != kCLAuthorizationStatusAuthorized) {
+		fputs(_("Request for location was not authorized!\n"),
+		      stderr);
+		[self stop];
+	}
+}
+
+@end
+
+
+int
+location_corelocation_init(void *state)
+{
+	return 0;
+}
+
+int
+location_corelocation_start(void *state)
+{
+	return 0;
+}
+
+void
+location_corelocation_free(void *state)
+{
+}
+
+void
+location_corelocation_print_help(FILE *f)
+{
+	fputs(_("Use the location as discovered by the Corelocation provider.\n"), f);
+	fputs("\n", f);
+
+	fputs(_("NOTE: currently redshift doesn't recheck CoreLocation once started,\n"
+		"which means it has to be restarted to take notice after travel.\n"),
+	      f);
+	fputs("\n", f);
+}
+
+int
+location_corelocation_set_option(void *state,
+				 const char *key, const char *value)
+{
+	fprintf(stderr, _("Unknown method parameter: `%s'.\n"), key);
+	return -1;
+}
+
+int
+location_corelocation_get_location(void *state,
+				   float *lat, float *lon)
+{
+	int result = -1;
+
+	@autoreleasepool {
+		Delegate *delegate = [[Delegate alloc] init];
+		[delegate performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:NO];
+		CFRunLoopRun();
+
+		if (delegate.success) {
+			*lat = delegate.latitude;
+			*lon = delegate.longitude;
+			result = 0;
+		}
+	}
+
+	return result;
+}
diff --git a/src/redshift.c b/src/redshift.c
index 0c9a6bd..818db4e 100644
--- a/src/redshift.c
+++ b/src/redshift.c
@@ -65,6 +65,10 @@
 # include "gamma-vidmode.h"
 #endif
 
+#ifdef ENABLE_QUARTZ
+# include "gamma-quartz.h"
+#endif
+
 #ifdef ENABLE_WINGDI
 # include "gamma-w32gdi.h"
 #endif
@@ -80,6 +84,10 @@
 # include "location-geoclue2.h"
 #endif
 
+#ifdef ENABLE_CORELOCATION
+# include "location-corelocation.h"
+#endif
+
 
 /* Union of state data for gamma adjustment methods */
 typedef union {
@@ -92,6 +100,9 @@ typedef union {
 #ifdef ENABLE_VIDMODE
 	vidmode_state_t vidmode;
 #endif
+#ifdef ENABLE_QUARTZ
+	quartz_state_t quartz;
+#endif
 #ifdef ENABLE_WINGDI
 	w32gdi_state_t w32gdi;
 #endif
@@ -136,6 +147,18 @@ static const gamma_method_t gamma_methods[] = {
 		(gamma_method_set_temperature_func *)vidmode_set_temperature
 	},
 #endif
+#ifdef ENABLE_QUARTZ
+	{
+		"quartz", 1,
+		(gamma_method_init_func *)quartz_init,
+		(gamma_method_start_func *)quartz_start,
+		(gamma_method_free_func *)quartz_free,
+		(gamma_method_print_help_func *)quartz_print_help,
+		(gamma_method_set_option_func *)quartz_set_option,
+		(gamma_method_restore_func *)quartz_restore,
+		(gamma_method_set_temperature_func *)quartz_set_temperature
+	},
+#endif
 #ifdef ENABLE_WINGDI
 	{
 		"wingdi", 1,
@@ -201,6 +224,20 @@ static const location_provider_t location_providers[] = {
 		location_geoclue2_get_location
 	},
 #endif
+#ifdef ENABLE_CORELOCATION
+	{
+		"corelocation",
+		(location_provider_init_func *)location_corelocation_init,
+		(location_provider_start_func *)location_corelocation_start,
+		(location_provider_free_func *)location_corelocation_free,
+		(location_provider_print_help_func *)
+		location_corelocation_print_help,
+		(location_provider_set_option_func *)
+		location_corelocation_set_option,
+		(location_provider_get_location_func *)
+		location_corelocation_get_location
+	},
+#endif
 	{
 		"manual",
 		(location_provider_init_func *)location_manual_init,