compositor: listen to role_resource destroy signal

Call wlr_surface_destroy_role_object() when the role_resource is
destroyed.

include/wlr/types/wlr_compositor.h

@@ -199,6 +199,7 @@ struct wlr_surface {
 	// private state
 
 	struct wl_listener renderer_destroy;
+	struct wl_listener role_resource_destroy;
 
 	struct {
 		int32_t scale;
@@ -246,6 +247,8 @@ bool wlr_surface_set_role(struct wlr_surface *surface, const struct wlr_surface_
 /**
  * Set the role object for this surface. The surface must have a role and
  * no already set role object.
+ *
+ * wlr_surface_destroy_role_object() is called when the resource is destroyed.
  */
 void wlr_surface_set_role_object(struct wlr_surface *surface, struct wl_resource *role_resource);
 

types/wlr_compositor.c

@@ -648,6 +648,7 @@ static void surface_handle_resource_destroy(struct wl_resource *resource) {
 	}
 
 	wl_list_remove(&surface->renderer_destroy.link);
+	wl_list_remove(&surface->role_resource_destroy.link);
 	surface_state_finish(&surface->pending);
 	surface_state_finish(&surface->current);
 	pixman_region32_fini(&surface->buffer_damage);
@@ -714,6 +715,8 @@ static struct wlr_surface *surface_create(struct wl_client *client,
 		wl_list_init(&surface->renderer_destroy.link);
 	}
 
+	wl_list_init(&surface->role_resource_destroy.link);
+
 	return surface;
 }
 
@@ -790,12 +793,19 @@ bool wlr_surface_set_role(struct wlr_surface *surface, const struct wlr_surface_
 	return true;
 }
 
+static void surface_handle_role_resource_destroy(struct wl_listener *listener, void *data) {
+	struct wlr_surface *surface = wl_container_of(listener, surface, role_resource_destroy);
+	wlr_surface_destroy_role_object(surface);
+}
+
 void wlr_surface_set_role_object(struct wlr_surface *surface, struct wl_resource *role_resource) {
 	assert(surface->role != NULL);
 	assert(!surface->role->no_object);
 	assert(surface->role_resource == NULL);
 	assert(role_resource != NULL);
 	surface->role_resource = role_resource;
+	surface->role_resource_destroy.notify = surface_handle_role_resource_destroy;
+	wl_resource_add_destroy_listener(role_resource, &surface->role_resource_destroy);
 }
 
 void wlr_surface_destroy_role_object(struct wlr_surface *surface) {
@@ -807,6 +817,8 @@ void wlr_surface_destroy_role_object(struct wlr_surface *surface) {
 		surface->role->destroy(surface);
 	}
 	surface->role_resource = NULL;
+	wl_list_remove(&surface->role_resource_destroy.link);
+	wl_list_init(&surface->role_resource_destroy.link);
 }
 
 uint32_t wlr_surface_lock_pending(struct wlr_surface *surface) {

types/wlr_input_method_v2.c

@@ -175,14 +175,6 @@ struct wlr_input_popup_surface_v2 *wlr_input_popup_surface_v2_try_from_wlr_surfa
 	return popup_surface_from_resource(surface->role_resource);
 }
 
-static void popup_resource_destroy(struct wl_resource *resource) {
-	struct wlr_input_popup_surface_v2 *popup_surface =
-		popup_surface_from_resource(resource);
-	if (popup_surface != NULL) {
-		wlr_surface_destroy_role_object(popup_surface->surface);
-	}
-}
-
 static void popup_destroy(struct wl_client *client,
 		struct wl_resource *resource) {
 	wl_resource_destroy(resource);
@@ -225,7 +217,7 @@ static void im_get_input_popup_surface(struct wl_client *client,
 	}
 
 	wl_resource_set_implementation(popup_resource, &input_popup_impl,
-		popup_surface, popup_resource_destroy);
+		popup_surface, NULL);
 
 	wlr_surface_set_role_object(surface, popup_resource);
 

types/wlr_layer_shell_v1.c

@@ -264,14 +264,6 @@ static const struct zwlr_layer_surface_v1_interface layer_surface_implementation
 	.set_layer = layer_surface_set_layer,
 };
 
-static void layer_surface_resource_destroy(struct wl_resource *resource) {
-	struct wlr_layer_surface_v1 *surface =
-		wlr_layer_surface_v1_from_resource(resource);
-	if (surface != NULL) {
-		wlr_surface_destroy_role_object(surface->surface);
-	}
-}
-
 uint32_t wlr_layer_surface_v1_configure(struct wlr_layer_surface_v1 *surface,
 		uint32_t width, uint32_t height) {
 	struct wl_display *display =
@@ -443,7 +435,7 @@ static void layer_shell_handle_get_layer_surface(struct wl_client *wl_client,
 	wlr_log(WLR_DEBUG, "new layer_surface %p (res %p)",
 			surface, surface->resource);
 	wl_resource_set_implementation(surface->resource,
-		&layer_surface_implementation, surface, layer_surface_resource_destroy);
+		&layer_surface_implementation, surface, NULL);
 
 	wlr_surface_set_role_object(wlr_surface, surface->resource);
 }

types/wlr_session_lock_v1.c

@@ -198,14 +198,6 @@ static void lock_surface_handle_output_destroy(struct wl_listener *listener,
 	wlr_surface_destroy_role_object(lock_surface->surface);
 }
 
-static void lock_surface_resource_destroy(struct wl_resource *resource) {
-	struct wlr_session_lock_surface_v1 *lock_surface =
-		lock_surface_from_resource(resource);
-	if (lock_surface != NULL) {
-		wlr_surface_destroy_role_object(lock_surface->surface);
-	}
-}
-
 static void lock_handle_get_lock_surface(struct wl_client *client,
 		struct wl_resource *lock_resource, uint32_t id,
 		struct wl_resource *surface_resource,
@@ -226,8 +218,7 @@ static void lock_handle_get_lock_surface(struct wl_client *client,
 	// Leave the lock surface resource inert for now, we will set the
 	// user data at the end of this function if everything is successful.
 	wl_resource_set_implementation(lock_surface_resource,
-		&lock_surface_implementation, NULL,
+		&lock_surface_implementation, NULL, NULL);
-		lock_surface_resource_destroy);
 
 	struct wlr_session_lock_v1 *lock = lock_from_resource(lock_resource);
 	if (lock == NULL) {

types/wlr_subcompositor.c

@@ -37,13 +37,6 @@ static struct wlr_subsurface *subsurface_from_resource(
 	return wl_resource_get_user_data(resource);
 }
 
-static void subsurface_resource_destroy(struct wl_resource *resource) {
-	struct wlr_subsurface *subsurface = subsurface_from_resource(resource);
-	if (subsurface != NULL) {
-		wlr_surface_destroy_role_object(subsurface->surface);
-	}
-}
-
 static void subsurface_handle_destroy(struct wl_client *client,
 		struct wl_resource *resource) {
 	wl_resource_destroy(resource);
@@ -342,7 +335,7 @@ static void subcompositor_handle_get_subsurface(struct wl_client *client,
 		return;
 	}
 	wl_resource_set_implementation(subsurface->resource,
-		&subsurface_implementation, subsurface, subsurface_resource_destroy);
+		&subsurface_implementation, subsurface, NULL);
 
 	wlr_surface_set_role_object(surface, subsurface->resource);
 

xwayland/shell.c

@@ -91,14 +91,6 @@ static void xwl_surface_handle_surface_destroy(struct wl_listener *listener,
 	wlr_surface_destroy_role_object(xwl_surface->surface);
 }
 
-static void xwl_surface_handle_resource_destroy(struct wl_resource *resource) {
-	struct wlr_xwayland_surface_v1 *xwl_surface =
-		xwl_surface_from_resource(resource);
-	if (xwl_surface != NULL) {
-		wlr_surface_destroy_role_object(xwl_surface->surface);
-	}
-}
-
 static void shell_handle_get_xwayland_surface(struct wl_client *client,
 		struct wl_resource *shell_resource, uint32_t id,
 		struct wl_resource *surface_resource) {
@@ -129,7 +121,7 @@ static void shell_handle_get_xwayland_surface(struct wl_client *client,
 		return;
 	}
 	wl_resource_set_implementation(xwl_surface->resource, &xwl_surface_impl,
-		xwl_surface, xwl_surface_handle_resource_destroy);
+		xwl_surface, NULL);
 
 	wlr_surface_set_role_object(surface, xwl_surface->resource);