From 005fc7dcf69fc112b5ce3d2c4017769cd8e425e8 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Mon, 18 May 2020 23:59:51 -0400
Subject: detect fullscreen windows (-f/-F)

---
 jsmond.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 95 insertions(+), 28 deletions(-)

(limited to 'jsmond.c')

diff --git a/jsmond.c b/jsmond.c
index ca3c1a0..643287d 100644
--- a/jsmond.c
+++ b/jsmond.c
@@ -52,6 +52,8 @@ char *js_node_name = JSNODE;     /* -j */
 int autodiscover = 1; /* cleared if user supplies joydev args */
 fake_mode_t fake_mode = fm_auto_keycode;  /* -k, -b, -m */
 char *c_command = NULL;          /* -c, -x */
+int monitor_joysticks = 1;       /* -F */
+int monitor_fullscreen = 0;      /* -f, -F */
 
 /* joystick stuff */
 char *joynames[MAX_STICKS + 1];
@@ -260,45 +262,90 @@ void check_inotify() {
 	}
 }
 
+int get_joystick_activity(void) {
+	struct js_event e;
+	int i, active = 0;
+
+	for(i = 0; i < last_joyname; i++) {
+		if(joyfds[i] < 0) continue;
+
+		if(debug) fprintf(stderr, "reading device %d, fd %d\n", i, joyfds[i]);
+
+		/* count events. any we get here *should* be real, but it doesn't
+			hurt to mask out synthetic ones again */
+		while(read(joyfds[i], &e, sizeof(e)) > 0) {
+			if(!(e.type & JS_EVENT_INIT)) active++;
+		}
+
+		/* EAGAIN just means there are no more events to read.
+			anything else is a problem, though not fatal */
+		if(errno != EAGAIN) {
+			if(debug) fprintf(stderr, "got error on device %d: %s\n", i, strerror(errno));
+		}
+	}
+
+	return active;
+}
+
+int have_fullscreen_window(void) {
+	Window w;
+	XWindowAttributes w_attrs, root_attrs;
+	int revert_to;
+
+	/* TODO: error check? */
+	XGetInputFocus(xdisp, &w, &revert_to);
+
+	if(w != None) {
+		XGetWindowAttributes(xdisp, DefaultRootWindow(xdisp), &root_attrs);
+		XGetWindowAttributes(xdisp, w, &w_attrs);
+
+		/*
+		fprintf(stderr, "window id %d has focus, geometry %dx%d\n",
+				(int)w, w_attrs.width, w_attrs.height);
+				*/
+
+		if( (w_attrs.map_state == IsViewable) &&
+			 (root_attrs.width == w_attrs.width) &&
+		    (root_attrs.height == w_attrs.height) )
+		{
+			if(debug) fprintf(stderr,
+					"window id 0x%x has input focus and looks fullscreen (%dx%d)\n",
+					(int)w, w_attrs.width, w_attrs.height);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
 /* this is the point of no return. the only way out of main_loop()
    is process death. */
 void main_loop(void) {
-	struct js_event e;
-	int i, active, sleep_us;
-
-	fprintf(stderr, "entering main_loop()\n");
+	int sleep_us;
 
 	sleep_us = interval * 1000;
+	fprintf(stderr, "entering main_loop(), sleep_us %d\n", sleep_us);
+
 	while(1) {
+		int active = 0;
+
 		/* Xlib will obligingly kill us, if X goes away */
 		ping_x_server();
 
 		/* check_inotify() will close & reopen the joystick fds as needed */
-		check_inotify();
+		if(monitor_joysticks)
+			check_inotify();
 
 		/* let the fds gather events as we slumber */
 		if(debug) fprintf(stderr, "sleeping %dms...\n", interval);
 		usleep(sleep_us);
 
 		/* now see if any of them got any events while we took a nap */
-		active = 0;
-		for(i = 0; i < last_joyname; i++) {
-			if(joyfds[i] < 0) continue;
-
-			if(debug) fprintf(stderr, "reading device %d, fd %d\n", i, joyfds[i]);
+		if(monitor_joysticks)
+			active += get_joystick_activity();
 
-			/* count events. any we get here *should* be real, but it doesn't
-			   hurt to mask out synthetic ones again */
-			while(read(joyfds[i], &e, sizeof(e)) > 0) {
-				if(!(e.type & JS_EVENT_INIT)) active++;
-			}
-
-			/* EAGAIN just means there are no more events to read.
-			   anything else is a problem, though not fatal */
-			if(errno != EAGAIN) {
-				if(debug) fprintf(stderr, "got error on device %d: %s\n", i, strerror(errno));
-			}
-		}
+		if(monitor_fullscreen)
+			active += have_fullscreen_window();
 
 		/* if we got any activity on any of the fds, do our thing */
 		if(active) {
@@ -474,9 +521,10 @@ void parse_args(int argc, char **argv) {
 					set_fake_mode(fm_cmd);
 					c_command = X_COMMAND;
 					break;
-				case 'f':
 				case 'F':
-					die("-f and -F not yet implemented");
+					monitor_joysticks = 0; /* and fall thru */
+				case 'f':
+					monitor_fullscreen = 1;
 					break;
 				default:
 					die("unrecognized argument, try --help");
@@ -640,16 +688,35 @@ void init_x(void) {
 	send_fake_x_event();
 }
 
+void print_banner() {
+	const char *m;
+
+	if(monitor_joysticks && monitor_fullscreen) {
+		m = "joysticks and fullscreen";
+	} else if(monitor_joysticks) {
+		m = "joysticks only";
+	} else if(monitor_fullscreen) {
+		m = "fullscreen only";
+	} else {
+		die("nothing to monitor!");
+	}
+
+	fprintf(stderr, "%s: v%s monitoring %s, interval %dms\n",
+			self, VERSION, m, interval);
+}
+
 int main(int argc, char **argv) {
 	set_exe_name(argv[0]);
 
 	parse_args(argc, argv);
 
-	if(autodiscover) populate_joynames();
+	print_banner();
 
-	init_joysticks();
-
-	init_inotify();
+	if(monitor_joysticks) {
+		if(autodiscover) populate_joynames();
+		init_joysticks();
+		init_inotify();
+	}
 
 	init_x();
 
-- 
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