Fix surface layer damage tracking

examples/layer-shell.c

@@ -76,7 +76,6 @@ static void draw(void) {
 		int32_t old_top = margin_top;
 		margin_top = -(20 - ((int)frame % 20));
 		if (old_top != margin_top) {
-			wlr_log(L_DEBUG, "setting margin to %d", margin_top);
 			zwlr_layer_surface_v1_set_margin(layer_surface,
 					margin_top, 0, 0, 0);
 			wl_surface_commit(wl_surface);

include/rootston/output.h

@@ -41,5 +41,7 @@ void output_damage_whole_drag_icon(struct roots_output *output,
 	struct roots_drag_icon *icon);
 void output_damage_from_local_surface(struct roots_output *output,
 	struct wlr_surface *surface, double ox, double oy, float rotation);
+void output_damage_whole_local_surface(struct roots_output *output,
+	struct wlr_surface *surface, double ox, double oy, float rotation);
 
 #endif

rootston/layer_shell.c

@@ -149,8 +149,6 @@ static void arrange_layer(struct wlr_output *output, struct wl_list *list,
 		apply_exclusive(usable_area, state->anchor, state->exclusive_zone,
 				state->margin.top, state->margin.right,
 				state->margin.bottom, state->margin.left);
-		wlr_log(L_DEBUG, "arranged layer at %dx%d@%d,%d",
-				box.width, box.height, box.x, box.y);
 		wlr_layer_surface_configure(layer, box.width, box.height);
 	}
 }
@@ -221,12 +219,18 @@ static void handle_surface_commit(struct wl_listener *listener, void *data) {
 	struct wlr_output *wlr_output = layer_surface->output;
 	if (wlr_output != NULL) {
 		struct roots_output *output = wlr_output->data;
-		output_damage_from_local_surface(output, layer_surface->surface,
+		struct wlr_box old_geo = layer->geo;
-				layer->geo.x, layer->geo.y, 0);
 		arrange_layers(wlr_output);
+		if (memcmp(&old_geo, &layer->geo, sizeof(struct wlr_box)) != 0) {
+			output_damage_whole_local_surface(output, layer_surface->surface,
+					old_geo.x, old_geo.y, 0);
+			output_damage_whole_local_surface(output, layer_surface->surface,
+					layer->geo.x, layer->geo.y, 0);
+		} else {
 			output_damage_from_local_surface(output, layer_surface->surface,
 					layer->geo.x, layer->geo.y, 0);
 		}
+	}
 }
 
 static void unmap(struct wlr_layer_surface *layer_surface) {

rootston/output.c

@@ -664,6 +664,14 @@ static void damage_whole_surface(struct wlr_surface *surface,
 	wlr_output_damage_add_box(output->damage, &box);
 }
 
+void output_damage_whole_local_surface(struct roots_output *output,
+		struct wlr_surface *surface, double ox, double oy, float rotation) {
+	struct wlr_output_layout_output *layout = wlr_output_layout_get(
+		output->desktop->layout, output->wlr_output);
+	damage_whole_surface(surface, ox + layout->x, oy + layout->y,
+			rotation, output);
+}
+
 static void damage_whole_decoration(struct roots_view *view,
 		struct roots_output *output) {
 	if (!view->decorated || view->wlr_surface == NULL) {