compositor: Move the logic of moving outputs into the core

Instead of having the backends move the remaining outputs when one is
destroyed, let the core compositor deal with that.

Signed-off-by: Zhang, Xiong Y <xiong.y.zhang@intel.com>
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>

src/compositor-drm.c

@@ -2222,7 +2222,6 @@ update_outputs(struct drm_compositor *ec, struct udev_device *drm_device)
 	drmModeRes *resources;
 	struct drm_output *output, *next;
 	int x = 0, y = 0;
-	int x_offset = 0, y_offset = 0;
 	uint32_t connected = 0, disconnects = 0;
 	int i;
 
@@ -2272,17 +2271,10 @@ update_outputs(struct drm_compositor *ec, struct udev_device *drm_device)
 	if (disconnects) {
 		wl_list_for_each_safe(output, next, &ec->base.output_list,
 				      base.link) {
-			if (x_offset != 0 || y_offset != 0) {
-				weston_output_move(&output->base,
-						 output->base.x - x_offset,
-						 output->base.y - y_offset);
-			}
-
 			if (disconnects & (1 << output->connector_id)) {
 				disconnects &= ~(1 << output->connector_id);
 				weston_log("connector %d disconnected\n",
 				       output->connector_id);
-				x_offset += output->base.width;
 				drm_output_destroy(&output->base);
 			}
 		}

src/compositor-x11.c

@@ -918,24 +918,10 @@ x11_compositor_find_output(struct x11_compositor *c, xcb_window_t window)
 static void
 x11_compositor_delete_window(struct x11_compositor *c, xcb_window_t window)
 {
-	struct x11_output *deleted_output, *output, *next;
-	int x_offset = 0;
-
-	deleted_output = x11_compositor_find_output(c, window);
-
-	wl_list_for_each_safe(output, next, &c->base.output_list, base.link) {
-		if (x_offset != 0) {
-			weston_output_move(&output->base,
-					   output->base.x - x_offset,
-					   output->base.y);
-			weston_output_damage(&output->base);
-		}
+	struct x11_output *output;
 
-		if (output == deleted_output) {
-			x_offset += output->base.width;
-			x11_output_destroy(&output->base);
-		}
-	}
+	output = x11_compositor_find_output(c, window);
+	x11_output_destroy(&output->base);
 
 	xcb_flush(c->conn);
 

src/compositor.c

@@ -2993,9 +2993,32 @@ bind_output(struct wl_client *client,
 		wl_output_send_done(resource);
 }
 
+/* Move other outputs when one is removed so the space remains contiguos. */
+static void
+weston_compositor_remove_output(struct weston_compositor *compositor,
+				struct weston_output *remove_output)
+{
+	struct weston_output *output;
+	int offset = 0;
+
+	wl_list_for_each(output, &compositor->output_list, link) {
+		if (output == remove_output) {
+			offset = output->width;
+			continue;
+		}
+
+		if (offset > 0) {
+			weston_output_move(output,
+					   output->x - offset, output->y);
+			output->dirty = 1;
+		}
+	}
+}
+
 WL_EXPORT void
 weston_output_destroy(struct weston_output *output)
 {
+	weston_compositor_remove_output(output->compositor, output);
 	wl_list_remove(&output->link);
 
 	wl_signal_emit(&output->destroy_signal, output);