void labeller_add_point(struct symbol *sym, struct osm_object *object, z_index_t zindex);
void labeller_add_line(struct symbol *sym, z_index_t zindex);
void labeller_label(void);
void labeller_add_point(struct symbol *sym, struct osm_object *object, z_index_t zindex);
void labeller_add_line(struct symbol *sym, z_index_t zindex);
void labeller_label(void);