compositor: drop wlr_surface.external_damage

include/wlr/types/wlr_compositor.h

@@ -141,11 +141,6 @@ struct wlr_surface {
 	 * positions need to be damaged.
 	 */
 	pixman_region32_t buffer_damage;
-	/**
-	 * The last commit's damage caused by surface and its subsurfaces'
-	 * movement, in surface-local coordinates.
-	 */
-	pixman_region32_t external_damage;
 	/**
 	 * The current opaque region, in surface-local coordinates. It is clipped to
 	 * the surface bounds. If the surface's buffer is using a fully opaque
@@ -404,10 +399,7 @@ void wlr_surface_for_each_surface(struct wlr_surface *surface,
 	wlr_surface_iterator_func_t iterator, void *user_data);
 
 /**
- * Get the effective surface damage in surface-local coordinate space. Besides
- * buffer damage, this includes damage induced by resizing and moving the
- * surface and its subsurfaces. The resulting damage is not expected to be
- * bounded by the surface itself.
+ * Get the effective surface damage in surface-local coordinate space.
  */
 void wlr_surface_get_effective_damage(struct wlr_surface *surface,
 	pixman_region32_t *damage);

include/wlr/types/wlr_subcompositor.h

@@ -39,7 +39,6 @@ struct wlr_subsurface {
 	bool has_cache;
 
 	bool synchronized;
-	bool reordered;
 	bool added;
 
 	struct wl_listener surface_client_commit;

types/wlr_compositor.c

@@ -531,15 +531,6 @@ static void surface_commit_state(struct wlr_surface *surface,
 
 	surface_update_damage(&surface->buffer_damage, &surface->current, next);
 
-	pixman_region32_clear(&surface->external_damage);
-	if (surface->current.width > next->width ||
-			surface->current.height > next->height ||
-			next->dx != 0 || next->dy != 0) {
-		pixman_region32_union_rect(&surface->external_damage,
-			&surface->external_damage, -next->dx, -next->dy,
-			surface->current.width, surface->current.height);
-	}
-
 	surface->previous.scale = surface->current.scale;
 	surface->previous.transform = surface->current.transform;
 	surface->previous.width = surface->current.width;
@@ -761,7 +752,6 @@ static void surface_handle_resource_destroy(struct wl_resource *resource) {
 	surface_state_finish(&surface->pending);
 	surface_state_finish(&surface->current);
 	pixman_region32_fini(&surface->buffer_damage);
-	pixman_region32_fini(&surface->external_damage);
 	pixman_region32_fini(&surface->opaque_region);
 	pixman_region32_fini(&surface->input_region);
 	if (surface->buffer != NULL) {
@@ -811,7 +801,6 @@ static struct wlr_surface *surface_create(struct wl_client *client,
 	wl_list_init(&surface->current_outputs);
 	wl_list_init(&surface->cached);
 	pixman_region32_init(&surface->buffer_damage);
-	pixman_region32_init(&surface->external_damage);
 	pixman_region32_init(&surface->opaque_region);
 	pixman_region32_init(&surface->input_region);
 	wlr_addon_set_init(&surface->addons);
@@ -1259,8 +1248,6 @@ void wlr_surface_get_effective_damage(struct wlr_surface *surface,
 		float scale_y = (float)surface->current.viewport.dst_height / src_height;
 		wlr_region_scale_xy(damage, damage, scale_x, scale_y);
 	}
-
-	pixman_region32_union(damage, damage, &surface->external_damage);
 }
 
 void wlr_surface_get_buffer_source_box(struct wlr_surface *surface,

types/wlr_subcompositor.c

@@ -118,8 +118,6 @@ static void subsurface_handle_place_above(struct wl_client *client,
 
 	wl_list_remove(&subsurface->pending.link);
 	wl_list_insert(node, &subsurface->pending.link);
-
-	subsurface->reordered = true;
 }
 
 static void subsurface_handle_place_below(struct wl_client *client,
@@ -150,8 +148,6 @@ static void subsurface_handle_place_below(struct wl_client *client,
 
 	wl_list_remove(&subsurface->pending.link);
 	wl_list_insert(node->prev, &subsurface->pending.link);
-
-	subsurface->reordered = true;
 }
 
 static void subsurface_handle_set_sync(struct wl_client *client,
@@ -281,37 +277,12 @@ static void subsurface_handle_surface_client_commit(
 	}
 }
 
-static void collect_damage_iter(struct wlr_surface *surface,
-		int sx, int sy, void *data) {
-	struct wlr_subsurface *subsurface = data;
-	pixman_region32_t *damage = &subsurface->parent->external_damage;
-	pixman_region32_union_rect(damage, damage,
-		subsurface->current.x + sx,
-		subsurface->current.y + sy,
-		surface->current.width, surface->current.height);
-}
-
 void subsurface_handle_parent_commit(struct wlr_subsurface *subsurface) {
-	struct wlr_surface *surface = subsurface->surface;
-
-	bool moved = subsurface->current.x != subsurface->previous.x ||
-		subsurface->current.y != subsurface->previous.y;
-	if (subsurface->surface->mapped && moved) {
-		wlr_surface_for_each_surface(surface,
-			collect_damage_iter, subsurface);
-	}
-
 	if (subsurface->synchronized && subsurface->has_cache) {
-		wlr_surface_unlock_cached(surface, subsurface->cached_seq);
+		wlr_surface_unlock_cached(subsurface->surface, subsurface->cached_seq);
 		subsurface->has_cache = false;
 	}
 
-	if (subsurface->surface->mapped && (moved || subsurface->reordered)) {
-		subsurface->reordered = false;
-		wlr_surface_for_each_surface(surface,
-			collect_damage_iter, subsurface);
-	}
-
 	if (!subsurface->added) {
 		subsurface->added = true;
 		wl_signal_emit_mutable(&subsurface->parent->events.new_subsurface,