compositor: introduce wlr_surface_destroy_role_object()

include/wlr/types/wlr_compositor.h

@@ -76,6 +76,7 @@ struct wlr_surface_role {
 	void (*commit)(struct wlr_surface *surface);
 	void (*precommit)(struct wlr_surface *surface,
 		const struct wlr_surface_state *state);
+	void (*destroy)(struct wlr_surface *surface);
 };
 
 struct wlr_surface_output {
@@ -189,8 +190,13 @@ typedef void (*wlr_surface_iterator_func_t)(struct wlr_surface *surface,
  * the role cannot be set.
  */
 bool wlr_surface_set_role(struct wlr_surface *surface,
-		const struct wlr_surface_role *role, void *role_data,
-		struct wl_resource *error_resource, uint32_t error_code);
+	const struct wlr_surface_role *role, void *role_data,
+	struct wl_resource *error_resource, uint32_t error_code);
+
+/**
+ * Destroy the role object for this surface. This doesn't reset the role.
+ */
+void wlr_surface_destroy_role_object(struct wlr_surface *surface);
 
 /**
  * Whether or not this surface currently has an attached buffer. A surface has

types/wlr_compositor.c

@@ -622,6 +622,8 @@ static void surface_handle_resource_destroy(struct wl_resource *resource) {
 		surface_output_destroy(surface_output);
 	}
 
+	wlr_surface_destroy_role_object(surface);
+
 	wl_signal_emit_mutable(&surface->events.destroy, surface);
 
 	wlr_addon_set_finish(&surface->addons);
@@ -732,6 +734,16 @@ bool wlr_surface_set_role(struct wlr_surface *surface,
 	return true;
 }
 
+void wlr_surface_destroy_role_object(struct wlr_surface *surface) {
+	if (surface->role_data == NULL) {
+		return;
+	}
+	if (surface->role->destroy != NULL) {
+		surface->role->destroy(surface);
+	}
+	surface->role_data = NULL;
+}
+
 uint32_t wlr_surface_lock_pending(struct wlr_surface *surface) {
 	surface->pending.cached_state_locks++;
 	return surface->pending.seq;