Fix wlr_surface destruction bug

examples/compositor.h

@@ -14,6 +14,10 @@ struct wl_compositor_state {
 void wl_compositor_init(struct wl_display *display,
 		struct wl_compositor_state *state, struct wlr_renderer *renderer);
 
+struct wlr_surface;
+void wl_compositor_surface_destroyed(struct wl_compositor_state *compositor,
+		struct wlr_surface *surface);
+
 struct wl_shell_state {
 	struct wl_global *wl_global;
 	struct wl_list wl_resources;

examples/compositor/wl_compositor.c

@@ -6,9 +6,8 @@
 #include "compositor.h"
 
 static void destroy_surface_listener(struct wl_listener *listener, void *data) {
-	struct wl_compositor_state *state;
-	struct wlr_surface *surface = data;
-	state = wl_container_of(listener, state, destroy_surface_listener);
+	struct wlr_surface *surface = wl_resource_get_user_data(data);
+	struct wl_compositor_state *state = surface->compositor_data;
 
 	struct wl_resource *res = NULL;
 	wl_list_for_each(res, &state->surfaces, link) {
@@ -25,8 +24,11 @@ static void wl_compositor_create_surface(struct wl_client *client,
 	struct wl_resource *surface_resource = wl_resource_create(client,
 			&wl_surface_interface, wl_resource_get_version(resource), id);
 	struct wlr_surface *surface = wlr_surface_create(surface_resource, state->renderer);
+	surface->compositor_data = state;
+	surface->compositor_listener.notify = &destroy_surface_listener;
+	wl_resource_add_destroy_listener(surface_resource, &surface->compositor_listener);
+
 	wl_list_insert(&state->surfaces, wl_resource_get_link(surface_resource));
-	wl_signal_add(&surface->signals.destroy, &state->destroy_surface_listener);
 }
 
 static void wl_compositor_create_region(struct wl_client *client,
@@ -73,7 +75,6 @@ void wl_compositor_init(struct wl_display *display,
 		&wl_compositor_interface, 4, state, wl_compositor_bind);
 	state->wl_global = wl_global;
 	state->renderer = renderer;
-	state->destroy_surface_listener.notify = destroy_surface_listener;
 	wl_list_init(&state->wl_resources);
 	wl_list_init(&state->surfaces);
 }

include/wlr/types/wlr_surface.h

@@ -37,11 +37,13 @@ struct wlr_surface {
 	float surface_to_buffer_matrix[16];
 
 	struct {
-		struct wl_signal destroy;
 		struct wl_signal commit;
 	} signals;
 
 	struct wl_list frame_callback_list; // wl_surface.frame
+
+	struct wl_listener compositor_listener; // destroy listener used by compositor
+	void *compositor_data;
 };
 
 struct wlr_renderer;

types/wlr_surface.c

@@ -161,13 +161,13 @@ const struct wl_surface_interface surface_interface = {
 
 static void destroy_surface(struct wl_resource *resource) {
 	struct wlr_surface *surface = wl_resource_get_user_data(resource);
-	wl_signal_emit(&surface->signals.destroy, surface);
-	wlr_texture_destroy(surface->texture);
 
+	wlr_texture_destroy(surface->texture);
 	struct wlr_frame_callback *cb, *next;
 	wl_list_for_each_safe(cb, next, &surface->frame_callback_list, link) {
 		wl_resource_destroy(cb->resource);
 	}
+
 	free(surface);
 }
 
@@ -177,7 +177,6 @@ struct wlr_surface *wlr_surface_create(struct wl_resource *res,
 	surface->texture = wlr_render_texture_init(renderer);
 	surface->resource = res;
 	wl_signal_init(&surface->signals.commit);
-	wl_signal_init(&surface->signals.destroy);
 	wl_list_init(&surface->frame_callback_list);
 	wl_resource_set_implementation(res, &surface_interface,
 			surface, destroy_surface);