surface: add addon set

include/wlr/types/wlr_surface.h

@@ -15,6 +15,7 @@
 #include <time.h>
 #include <wayland-server-core.h>
 #include <wlr/types/wlr_output.h>
+#include <wlr/util/addon.h>
 #include <wlr/util/box.h>
 
 enum wlr_surface_state_field {
@@ -141,6 +142,7 @@ struct wlr_surface {
 
 	struct wl_list current_outputs; // wlr_surface_output::link
 
+	struct wlr_addon_set addons;
 	void *data;
 
 	// private state

types/wlr_surface.c

@@ -693,6 +693,8 @@ static void surface_handle_resource_destroy(struct wl_resource *resource) {
 
 	wlr_signal_emit_safe(&surface->events.destroy, surface);
 
+	wlr_addon_set_finish(&surface->addons);
+
 	struct wlr_surface_state *cached, *cached_tmp;
 	wl_list_for_each_safe(cached, cached_tmp, &surface->cached, cached_state_link) {
 		surface_state_destroy_cached(cached);
@@ -750,6 +752,7 @@ struct wlr_surface *surface_create(struct wl_client *client,
 	pixman_region32_init(&surface->buffer_damage);
 	pixman_region32_init(&surface->opaque_region);
 	pixman_region32_init(&surface->input_region);
+	wlr_addon_set_init(&surface->addons);
 
 	wl_signal_add(&renderer->events.destroy, &surface->renderer_destroy);
 	surface->renderer_destroy.notify = surface_handle_renderer_destroy;