Define monitor's x,y at compile time

Replaces the outputOrder patch.

This avoids recalculating positions and allows to arrange monitors in
any order, not just from left to right.

The order in which monitors are defined in config.h still matters but
it's just the order in the list, not the actual position.

config.def.h

@@ -28,12 +28,14 @@ static const Layout layouts[] = {
  * The order in which monitors are defined determines their position.
  * Non-configured monitors are always added to the left. */
 static const MonitorRule monrules[] = {
-	/* name       mfact nmaster scale layout       rotate/reflect */
+	/* name       mfact nmaster scale layout       rotate/reflect x y */
 	/* example of a HiDPI laptop monitor:
-	{ "eDP-1",    0.5,  1,      2,    &layouts[0], WL_OUTPUT_TRANSFORM_NORMAL },
+	{ "eDP-1",    0.5,  1,      2,    &layouts[0], WL_OUTPUT_TRANSFORM_NORMAL, 0, 0 },
 	*/
+	/* the order in which monitors are defined here affects the order in which
+	 * focusmon and tagmon cycle trough the monitors */
 	/* defaults */
-	{ NULL,       0.55, 1,      1,    &layouts[0], WL_OUTPUT_TRANSFORM_NORMAL },
+	{ NULL,       0.55, 1,      1,    &layouts[0], WL_OUTPUT_TRANSFORM_NORMAL, 0, 0 },
 };
 
 /* keyboard */

dwl.c

@@ -186,6 +186,8 @@ typedef struct {
 	float scale;
 	const Layout *lt;
 	enum wl_output_transform rr;
+	int x;
+	int y;
 } MonitorRule;
 
 typedef struct {
@@ -814,11 +816,9 @@ createmon(struct wl_listener *listener, void *data)
 	/* This event is raised by the backend when a new output (aka a display or
 	 * monitor) becomes available. */
 	struct wlr_output *wlr_output = data;
-	Monitor *m;
 	const MonitorRule *r;
 	size_t nlayers;
-	Monitor *moni, *insertmon = NULL;
-	int x = 0;
+	Monitor *m, *moni, *insertmon = NULL;
 
 	/* The mode is a tuple of (width, height, refresh rate), and each
 	 * monitor supports only a specific set of modes. We just pick the
@@ -851,12 +851,11 @@ createmon(struct wl_listener *listener, void *data)
 	wl_list_for_each(moni, &mons, link)
 		if (m->position > moni->position)
 			insertmon = moni;
-	if (insertmon) {
-		x = insertmon->w.x + insertmon->w.width;
+
+	if (insertmon) /* insertmon is the leftmost monitor to m */
 		wl_list_insert(&insertmon->link, &m->link);
-	} else {
+	else
 		wl_list_insert(&mons, &m->link);
-	}
 
 	wlr_output_enable(wlr_output, 1);
 	if (!wlr_output_commit(wlr_output))
@@ -868,13 +867,7 @@ createmon(struct wl_listener *listener, void *data)
 	 * display, which Wayland clients can see to find out information about the
 	 * output (such as DPI, scale factor, manufacturer, etc).
 	 */
-	wlr_output_layout_add(output_layout, wlr_output, x, 0);
-	wl_list_for_each_reverse(moni, &mons, link) {
-		/* All monitors to the right of the new one must be moved */
-		if (moni == m)
-			break;
-		wlr_output_layout_move(output_layout, moni->wlr_output, moni->w.x + m->wlr_output->width, 0);
-	}
+	wlr_output_layout_add(output_layout, wlr_output, r->x, r->y);
 	sgeom = *wlr_output_layout_get_box(output_layout, NULL);
 
 	nlayers = LENGTH(m->layers);