Add a command line option for choosing a monitor for osd display

wmix/config.c

@@ -25,6 +25,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <getopt.h>
+#include <limits.h>
 
 #include <sys/soundcard.h>
 
@@ -45,6 +46,8 @@
 	"  -k        disable grabing volume control keys\n" \
 	"  -m <dev>  oss mixer device [/dev/mixer]\n" \
 	"            or alsa card name [default]\n" \
+	"  -o <num>  display osd on this monitor number or name [0]\n" \
+	"            use -1 to disable osd\n" \
 	"  -v        verbose -> id, long name, name\n" \
 
 /* The global configuration */
@@ -73,6 +76,8 @@ void config_init(void)
 	config.scrollstep = 0.03;
 	config.osd = 1;
 	config.osd_color = (char *) default_osd_color;
+	config.osd_monitor_number = 0;
+	config.osd_monitor_name = NULL;
 }
 
 /*
@@ -122,7 +127,7 @@ void parse_cli_options(int argc, char **argv)
 	config.verbose = false;
 	error_found = false;
 	for (;;) {
-		opt = getopt(argc, argv, ":a:d:e:f:hkm:v");
+		opt = getopt(argc, argv, ":a:d:e:f:hkm:o:v");
 		if (opt == -1)
 			break;
 
@@ -178,6 +183,24 @@ void parse_cli_options(int argc, char **argv)
 			config.mixer_device = strdup(optarg);
 			break;
 
+		case 'o': ;
+			char *end;
+			long mon = strtol(optarg, &end, 10);
+			if (end == optarg + strlen(optarg)) {
+				if ((mon > INT_MAX) || (mon < -1)) {
+					fprintf(stderr, "wmix:error: unreasonable monitor number provided\n");
+					error_found = true;
+				} else {
+					if (mon == -1)
+						config.osd = 0;
+					else
+						config.osd_monitor_number = (int)mon;
+				}
+			} else {
+				config.osd_monitor_name = strdup(optarg);
+			}
+			break;
+
 		case 'v':
 			config.verbose = true;
 			break;

wmix/include/config.h

@@ -40,6 +40,8 @@ extern struct _Config {
 
 	float        scrollstep;		/* scroll mouse step adjustment */
 	char        *osd_color;			/* osd color */
+	char        *osd_monitor_name;		/* monitor name to display osd on */
+	int          osd_monitor_number;	/* monitor number to display osd on */
 
 	char        *exclude_channel[EXCLUDE_MAX_COUNT + 1];	/* Devices to exclude from GUI's list */
 } config;

wmix/ui_x.c

@@ -335,6 +335,35 @@ void new_window(char *name, int width, int height)
     XMapWindow(display, win);
 }
 
+XRRCrtcInfo *crtc_info_by_output_name(char *monitor)
+{
+    XRRScreenResources *screen = XRRGetScreenResources(display, DefaultRootWindow(display));
+    for (int i = 0; i < screen->noutput; i++) {
+        XRROutputInfo *output_info = XRRGetOutputInfo(display, screen, screen->outputs[i]);
+        if (!strcmp(monitor, output_info->name)) {
+	    XRRCrtcInfo *crtc_info = XRRGetCrtcInfo(display, screen, output_info->crtc);
+	    XRRFreeOutputInfo(output_info);
+	    XRRFreeScreenResources(screen);
+            return crtc_info;
+	}
+	XRRFreeOutputInfo(output_info);
+    }
+    XRRFreeScreenResources(screen);
+    return NULL;
+}
+
+XRRCrtcInfo *crtc_info_by_output_number(int monitor)
+{
+    XRRScreenResources *screen = XRRGetScreenResources(display, DefaultRootWindow(display));
+    if (monitor >= screen->ncrtc) {
+	fprintf(stderr, "wmix:warning: Requested osd monitor number is out of range, clamping\n");
+	monitor = screen->ncrtc - 1;
+    }
+    XRRCrtcInfo *crtc_info = XRRGetCrtcInfo(display, screen, screen->crtcs[monitor]);
+    XRRFreeScreenResources(screen);
+    return crtc_info;
+}
+
 void new_osd(int height)
 {
     Window osd;
@@ -345,18 +374,27 @@ void new_osd(int height)
     XSetWindowAttributes xattributes;
     int win_layer = 6;
     XFontStruct *fs = NULL;
-    XRRScreenResources *screen;
     XRRCrtcInfo *crtc_info;
     int width;
     int x;
     int y;
 
     if (have_randr) {
-        screen = XRRGetScreenResources(display, DefaultRootWindow(display));
-        crtc_info = XRRGetCrtcInfo(display, screen, screen->crtcs[0]);
+        if (config.osd_monitor_name) {
+            crtc_info = crtc_info_by_output_name(config.osd_monitor_name);
+	    if (crtc_info == NULL) {
+		fprintf(stderr, "wmix:warning: Requested osd monitor not found, falling back to default\n");
+		crtc_info = crtc_info_by_output_number(0);
+	    }
+	}
+        else {
+	    crtc_info = crtc_info_by_output_number(config.osd_monitor_number);
+	}
+
         width = crtc_info->width - 200;
         x = crtc_info->x + 100;
         y = crtc_info->y + crtc_info->height - 120;
+	XRRFreeCrtcInfo(crtc_info);
         if (dockapp.osd &&
             width == dockapp.osd_width &&
             x == dockapp.osd_x &&