new experimental updategeom() additions that should avoid several problems with Xinerama, this is EXPERIMENTAL and might break something, the algorithms in use are quite complex and cumbersome, patches and comments welcome

1 files changed, 77 insertions, 24 deletions

diff --git a/dwm.c b/dwm.c
index 1cb07d3ab843..2b4d6b03c137 100644
--- a/dwm.c
+++ b/dwm.c
@@ -221,7 +221,7 @@ static void toggleview(const Arg *arg);
 static void unfocus(Client *c);
 static void unmanage(Client *c, Bool destroyed);
 static void unmapnotify(XEvent *e);
-static void updategeom(void);
+static Bool updategeom(void);
 static void updatebarpos(Monitor *m);
 static void updatebars(void);
 static void updatenumlockmask(void);
@@ -535,14 +535,15 @@ configurenotify(XEvent *e) {
 	if(ev->window == root) {
 		sw = ev->width;
 		sh = ev->height;
-		updategeom();
-		if(dc.drawable != 0)
-			XFreePixmap(dpy, dc.drawable);
-		dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
-		updatebars();
-		for(m = mons; m; m = m->next)
-			XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
-		arrange();
+		if(updategeom()) {
+			if(dc.drawable != 0)
+				XFreePixmap(dpy, dc.drawable);
+			dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
+			updatebars();
+			for(m = mons; m; m = m->next)
+				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
+			arrange();
+		}
 	}
 }
 
@@ -1692,26 +1693,73 @@ updatebarpos(Monitor *m) {
 		m->by = -bh;
 }
 
-void
+Bool
 updategeom(void) {
-	int i, n = 1;
+	int i, j, nn = 1, n = 1;
 	Client *c;
 	Monitor *newmons = NULL, *m = NULL, *tm;
 
 #ifdef XINERAMA
-	int nn;
 	XineramaScreenInfo *info = NULL;
+	Bool *flags = NULL;
 
 	if(XineramaIsActive(dpy))
 		info = XineramaQueryScreens(dpy, &n);
-	for(i = 1, nn = n; i < n; i++)
-		if(info[i - 1].x_org == info[i].x_org && info[i - 1].y_org == info[i].y_org
-		&& info[i - 1].width == info[i].width && info[i - 1].height == info[i].height)
-			--nn;
-	n = nn; /* we only consider unique geometries as separate screens */
+	flags = (Bool *)malloc(sizeof(Bool) * n);
+	for(i = 0; i < n; i++)
+		flags[i] = False;
+	/* next double-loop seeks any combination of retrieved Xinerama info
+	 * with existing monitors, this is used to avoid unnecessary
+	 * re-allocations of monitor structs */
+	for(i = 0, nn = n; i < n; i++)
+		for(j = 0, m = mons; m; m = m->next, j++)
+			if(!flags[j]) {
+				if((flags[j] = (
+					info[i].x_org == m->mx
+					&& info[i].y_org == m->my
+					&& info[i].width == m->mw
+					&& info[i].height == m->mh)
+				))
+					--nn;
+			}
+	if(nn == 0) { /* no need to re-allocate monitors */
+		j = 0;
+		for(i = 0, m = mons; m; m = m->next, i++) {
+			m->num = info[i].screen_number;
+			if(info[i].x_org != m->mx
+			|| info[i].y_org != m->my
+			|| info[i].width != m->mw
+			|| info[i].height != m->mh)
+			{
+				m->mx = m->wx = info[i].x_org;
+				m->my = m->wy = info[i].y_org;
+				m->mw = m->ww = info[i].width;
+				m->mh = m->wh = info[i].height;
+				updatebarpos(m);
+				j++;
+			}
+		}
+		XFree(info);
+		free(flags);
+		return j > 0;
+	}
+	/* next algorithm only considers unique geometries as separate screens */
+	for(i = 0; i < n; i++)
+		flags[i] = False; /* used for ignoring certain monitors */
+	for(i = 0, nn = n; i < n; i++)
+		for(j = 0; j < n; j++)
+			if(i != j && !flags[i]) {
+				if((flags[i] = (
+					info[i].x_org == info[j].x_org
+					&& info[i].y_org == info[j].y_org
+					&& info[i].width == info[j].width
+					&& info[i].height == info[j].height)
+				))
+					--nn;
+			}
 #endif /* XINERAMA */
 	/* allocate monitor(s) for the new geometry setup */
-	for(i = 0; i < n; i++) {
+	for(i = 0; i < nn; i++) {
 		if(!(m = (Monitor *)malloc(sizeof(Monitor))))
 			die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 		m->next = newmons;
@@ -1720,14 +1768,18 @@ updategeom(void) {
 	/* initialise monitor(s) */
 #ifdef XINERAMA
 	if(XineramaIsActive(dpy)) {
-		for(i = 0, m = newmons; m; m = m->next, i++) {
-			m->num = info[i].screen_number;
-			m->mx = m->wx = info[i].x_org;
-			m->my = m->wy = info[i].y_org;
-			m->mw = m->ww = info[i].width;
-			m->mh = m->wh = info[i].height;
+		for(i = 0, m = newmons; m && i < n; i++) {
+			if(!flags[i]) { /* only use screens that aren't dublettes */
+				m->num = info[i].screen_number;
+				m->mx = m->wx = info[i].x_org;
+				m->my = m->wy = info[i].y_org;
+				m->mw = m->ww = info[i].width;
+				m->mh = m->wh = info[i].height;
+				m = m->next;
+			}
 		}
 		XFree(info);
+		free(flags);
 	}
 	else
 #endif /* XINERAMA */
@@ -1767,6 +1819,7 @@ updategeom(void) {
 	cleanupmons();
 	selmon = mons = newmons;
 	selmon = wintomon(root);
+	return True;
 }
 
 void