Add fullscreen bypass support

CONTRIBUTING.md

@@ -50,9 +50,10 @@ Dependencies
 
 * autotools, gettext
 * intltool, libtool
+* libX11
 * libdrm (Optional, for DRM support)
 * libxcb, libxcb-randr (Optional, for RandR support)
-* libX11, libXxf86vm (Optional, for VidMode support)
+* libXxf86vm (Optional, for VidMode support)
 * Glib 2 (Optional, for GeoClue2 support)
 
 * python3, pygobject, pyxdg (Optional, for GUI support)

po/POTFILES.in

@@ -7,6 +7,7 @@ data/applications/redshift-gtk.desktop.in
 src/redshift.c
 src/options.c
 src/config-ini.c
+src/fullscreen.c
 
 src/gamma-drm.c
 src/gamma-randr.c

src/Makefile.am

@@ -19,7 +19,8 @@ redshift_SOURCES = \
 	redshift.c redshift.h \
 	signals.c signals.h \
 	solar.c solar.h \
-	systemtime.c systemtime.h
+	systemtime.c systemtime.h \
+	fullscreen.c fullscreen.h
 
 EXTRA_redshift_SOURCES = \
 	gamma-drm.c gamma-drm.h \

src/fullscreen.c

@@ -0,0 +1,96 @@
+/* fullscreen.h -- Fullscreen detector
+   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) 2021  Angelo Elias Dalzotto <angelodalzotto97@gmail.com>
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+
+#ifdef ENABLE_NLS
+# include <libintl.h>
+# define _(s) gettext(s)
+#else
+# define _(s) s
+#endif
+
+#ifndef _WIN32
+# include <X11/Xlib.h>
+#endif
+
+#include "fullscreen.h"
+#include "redshift.h"
+
+#ifndef _WIN32
+static Display *display;
+static int screen_width, screen_height;
+#endif
+
+static int
+fullscreen_init()
+{
+#ifndef _WIN32
+	screen_height = -1;
+	screen_width = -1;
+	display = XOpenDisplay(NULL);
+	if (display == NULL) {
+		fprintf(stderr, _("X request failed: %s\n"), "XOpenDisplay");
+		return -1;
+	}
+
+	int screen = DefaultScreen(display);
+	screen_width = DisplayWidth(display, screen);
+	screen_height = DisplayHeight(display, screen);
+#endif
+
+	return 0;
+}
+
+static int
+fullscreen_check()
+{
+#ifndef _WIN32
+	Window window;
+	int revert_to = RevertToParent;
+	int result = XGetInputFocus(display, &window, &revert_to);
+
+	int win_x, win_y, win_w, win_h, win_b, win_d;
+	if(result) {
+		Window rootWindow;
+		result = XGetGeometry(display, window, &rootWindow, &win_x, &win_y, &win_w, &win_h, &win_b, &win_d);
+	}
+
+	if (result && win_w == screen_width && win_h == screen_height) {
+		return 1;
+	} else {
+#endif
+		return 0;
+#ifndef _WIN32
+	}
+#endif
+}
+
+const fullscreen_t fullscreen = {
+	"fullscreen",
+	(fullscreen_init_func *)fullscreen_init,
+	(fullscreen_check_func *)fullscreen_check,
+};

src/fullscreen.h

@@ -0,0 +1,28 @@
+/* fullscreen.h -- Fullscreen detector 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) 2021  Angelo Elias Dalzotto <angelodalzotto97@gmail.com>
+*/
+
+#ifndef REDSHIFT_FULLSCREEN_H
+#define REDSHIFT_FULLSCREEN_H
+
+#include "redshift.h"
+
+extern const fullscreen_t fullscreen;
+
+#endif /* ! REDSHIFT_FULLSCREEN_H */
+

src/options.c

@@ -178,6 +178,7 @@ print_help(const char *program_name)
 	   no-wrap */
 	fputs(_("  -b DAY:NIGHT\tScreen brightness to apply (between 0.1 and 1.0)\n"
 		"  -c FILE\tLoad settings from specified configuration file\n"
+		"  -f BOOL\tEnable or disable fullscreen windows bypass\n"
 		"  -g R:G:B\tAdditional gamma correction to apply\n"
 		"  -l LAT:LON\tYour current location\n"
 		"  -l PROVIDER\tSelect provider for automatic"
@@ -323,6 +324,7 @@ options_init(options_t *options)
 	options->preserve_gamma = 1;
 	options->mode = PROGRAM_MODE_CONTINUAL;
 	options->verbose = 0;
+	options->fullscreen_check = 1;
 }
 
 /* Parse a single option from the command-line. */
@@ -345,6 +347,9 @@ parse_command_line_option(
 		free(options->config_filepath);
 		options->config_filepath = strdup(value);
 		break;
+	case 'f':
+		options->fullscreen_check = atoi(value);
+		break;
 	case 'g':
 		r = parse_gamma_string(value, options->scheme.day.gamma);
 		if (r < 0) {
@@ -495,7 +500,7 @@ options_parse_args(
 {
 	const char* program_name = argv[0];
 	int opt;
-	while ((opt = getopt(argc, argv, "b:c:g:hl:m:oO:pPrt:vVx")) != -1) {
+	while ((opt = getopt(argc, argv, "b:c:f:g:hl:m:oO:pPrt:vVx")) != -1) {
 		char option = opt;
 		int r = parse_command_line_option(
 			option, optarg, options, program_name, gamma_methods,

src/options.h

@@ -29,6 +29,7 @@ typedef struct {
 	transition_scheme_t scheme;
 	program_mode_t mode;
 	int verbose;
+	int fullscreen_check;
 
 	/* Temperature to set in manual mode. */
 	int temp_set;

src/redshift.c

@@ -66,6 +66,7 @@ int poll(struct pollfd *fds, int nfds, int timeout) { abort(); return -1; }
 #include "hooks.h"
 #include "signals.h"
 #include "options.h"
+#include "fullscreen.h"
 
 /* pause() is not defined on windows platform but is not needed either.
    Use a noop macro instead. */
@@ -608,7 +609,7 @@ run_continual_mode(const location_provider_t *provider,
 		   const transition_scheme_t *scheme,
 		   const gamma_method_t *method,
 		   gamma_state_t *method_state,
-		   int use_fade, int preserve_gamma, int verbose)
+		   int use_fade, int preserve_gamma, int fullscreen_check, int verbose)
 {
 	int r;
 
@@ -662,18 +663,31 @@ run_continual_mode(const location_provider_t *provider,
 		printf(_("Brightness: %.2f\n"), interp.brightness);
 	}
 
+	if (fullscreen_check) {
+		fullscreen.init();
+	}
+
 	/* Continuously adjust color temperature */
 	int done = 0;
 	int prev_disabled = 1;
 	int disabled = 0;
 	int location_available = 1;
+	int prev_fullscreen = 0;
+	int is_fullscreen = 0;
+	int fs_disabled = 0;
 	while (1) {
 		/* Check to see if disable signal was caught */
 		if (disable && !done) {
 			disabled = !disabled;
 			disable = 0;
 		}
 
+		/* Check to see if fs_disable signal was caught */
+		if (fs_disable && !done){
+			fs_disabled = !fs_disabled;
+			fs_disable = 0;
+		}
+
 		/* Check to see if exit signal was caught */
 		if (exiting) {
 			if (done) {
@@ -686,13 +700,20 @@ run_continual_mode(const location_provider_t *provider,
 			exiting = 0;
 		}
 
+		if (fullscreen_check && fullscreen.check() && !done && !fs_disabled) {
+			is_fullscreen = 1;
+		} else {
+			is_fullscreen = 0;
+		}
+
 		/* Print status change */
-		if (verbose && disabled != prev_disabled) {
-			printf(_("Status: %s\n"), disabled ?
+		if (verbose && ((disabled || is_fullscreen) != (prev_disabled || prev_fullscreen))) {
+			printf(_("Status: %s\n"), (disabled || is_fullscreen) ?
 			       _("Disabled") : _("Enabled"));
 		}
 
 		prev_disabled = disabled;
+		prev_fullscreen = is_fullscreen;
 
 		/* Read timestamp */
 		double now;
@@ -727,7 +748,7 @@ run_continual_mode(const location_provider_t *provider,
 		interpolate_transition_scheme(
 			scheme, transition_prog, &target_interp);
 
-		if (disabled) {
+		if (disabled || is_fullscreen) {
 			period = PERIOD_NONE;
 			color_setting_reset(&target_interp);
 		}
@@ -1308,6 +1329,7 @@ main(int argc, char *argv[])
 			options.provider, location_state, scheme,
 			options.method, method_state,
 			options.use_fade, options.preserve_gamma,
+			options.fullscreen_check,
 			options.verbose);
 		if (r < 0) exit(EXIT_FAILURE);
 	}

src/redshift.h

@@ -150,4 +150,18 @@ typedef struct {
 } location_provider_t;
 
 
+/* Fullscreen detector */
+typedef int fullscreen_init_func();
+typedef int fullscreen_check_func();
+
+typedef struct {
+	char *name;
+
+	/* Initialize display. */
+	fullscreen_init_func *init;
+
+	/* Check if active window is fullscreen. */
+	fullscreen_check_func *check;
+} fullscreen_t;
+
 #endif /* ! REDSHIFT_REDSHIFT_H */

src/signals.c

@@ -34,6 +34,7 @@
 
 volatile sig_atomic_t exiting = 0;
 volatile sig_atomic_t disable = 0;
+volatile sig_atomic_t fs_disable = 0;
 
 
 /* Signal handler for exit signals */
@@ -50,10 +51,18 @@ sigdisable(int signo)
 	disable = 1;
 }
 
+/* Signal handler for disabling the fullscreen detector signal */
+static void
+sigfsdisable(int signo)
+{
+	fs_disable = 1;
+}
+
 #else /* ! HAVE_SIGNAL_H || __WIN32__ */
 
 int disable = 0;
 int exiting = 0;
+int fs_disable = 0;
 
 #endif /* ! HAVE_SIGNAL_H || __WIN32__ */
 
@@ -95,6 +104,17 @@ signals_install_handlers(void)
 		return -1;
 	}
 
+	/* Install signal handler for USR2 signal */
+	sigact.sa_handler = sigfsdisable;
+	sigact.sa_mask = sigset;
+	sigact.sa_flags = 0;
+
+	r = sigaction(SIGUSR2, &sigact, NULL);
+	if (r < 0) {
+		perror("sigaction");
+		return -1;
+	}
+
 	/* Ignore CHLD signal. This causes child processes
 	   (hooks) to be reaped automatically. */
 	sigact.sa_handler = SIG_IGN;

src/signals.h

@@ -25,10 +25,12 @@
 
 extern volatile sig_atomic_t exiting;
 extern volatile sig_atomic_t disable;
+extern volatile sig_atomic_t fs_disable;
 
 #else /* ! HAVE_SIGNAL_H || __WIN32__ */
 extern int exiting;
 extern int disable;
+extern int fs_disable;
 #endif /* ! HAVE_SIGNAL_H || __WIN32__ */