[draw] Add get_empty / [sg]et_user_data

docs/harfbuzz-sections.txt

@@ -191,8 +191,11 @@ HB_DEPRECATED_FOR
 <SECTION>
 <FILE>hb-draw</FILE>
 hb_draw_funcs_create
+hb_draw_funcs_get_empty
 hb_draw_funcs_reference
 hb_draw_funcs_destroy
+hb_draw_funcs_set_user_data
+hb_draw_funcs_get_user_data
 hb_draw_funcs_make_immutable
 hb_draw_funcs_is_immutable
 hb_draw_move_to_func_t

src/hb-cplusplus.hh

@@ -160,6 +160,8 @@ HB_DEFINE_VTABLE (map);
 HB_DEFINE_VTABLE (set);
 HB_DEFINE_VTABLE (shape_plan);
 HB_DEFINE_VTABLE (unicode_funcs);
+HB_DEFINE_VTABLE (draw_funcs);
+//HB_DEFINE_VTABLE (paint_funcs);
 
 #undef HB_DEFINE_VTABLE
 

src/hb-draw.cc

@@ -198,6 +198,21 @@ DEFINE_NULL_INSTANCE (hb_draw_funcs_t) =
   }
 };
 
+/**
+ * hb_draw_funcs_get_empty:
+ *
+ * Fetches the singleton empty draw-functions structure.
+ *
+ * Return value: (transfer full): The empty draw-functions structure
+ *
+ * Since: REPLACEME
+ **/
+hb_draw_funcs_t *
+hb_draw_funcs_get_empty ()
+{
+  return const_cast<hb_draw_funcs_t *> (&Null (hb_draw_funcs_t));
+}
+
 
 /**
  * hb_draw_funcs_reference: (skip)
@@ -248,6 +263,49 @@ hb_draw_funcs_destroy (hb_draw_funcs_t *dfuncs)
   hb_free (dfuncs);
 }
 
+/**
+ * hb_draw_funcs_set_user_data: (skip)
+ * @dfuncs: The draw-functions structure
+ * @key: The user-data key
+ * @data: A pointer to the user data
+ * @destroy: (nullable): A callback to call when @data is not needed anymore
+ * @replace: Whether to replace an existing data with the same key
+ *
+ * Attaches a user-data key/data pair to the specified draw-functions structure. 
+ *
+ * Return value: `true` if success, `false` otherwise
+ *
+ * Since: REPLACEME
+ **/
+hb_bool_t
+hb_draw_funcs_set_user_data (hb_draw_funcs_t *dfuncs,
+			     hb_user_data_key_t *key,
+			     void *              data,
+			     hb_destroy_func_t   destroy,
+			     hb_bool_t           replace)
+{
+  return hb_object_set_user_data (dfuncs, key, data, destroy, replace);
+}
+
+/**
+ * hb_draw_funcs_get_user_data: (skip)
+ * @dfuncs: The draw-functions structure
+ * @key: The user-data key to query
+ *
+ * Fetches the user-data associated with the specified key,
+ * attached to the specified draw-functions structure.
+ *
+ * Return value: (transfer none): A pointer to the user data
+ *
+ * Since: REPLACEME
+ **/
+void *
+hb_draw_funcs_get_user_data (const hb_draw_funcs_t *dfuncs,
+			     hb_user_data_key_t       *key)
+{
+  return hb_object_get_user_data (dfuncs, key);
+}
+
 /**
  * hb_draw_funcs_make_immutable:
  * @dfuncs: draw functions

src/hb-draw.h

@@ -279,12 +279,27 @@ hb_draw_funcs_set_close_path_func (hb_draw_funcs_t           *dfuncs,
 HB_EXTERN hb_draw_funcs_t *
 hb_draw_funcs_create (void);
 
+HB_EXTERN hb_draw_funcs_t *
+hb_draw_funcs_get_empty (void);
+
 HB_EXTERN hb_draw_funcs_t *
 hb_draw_funcs_reference (hb_draw_funcs_t *dfuncs);
 
 HB_EXTERN void
 hb_draw_funcs_destroy (hb_draw_funcs_t *dfuncs);
 
+HB_EXTERN hb_bool_t
+hb_draw_funcs_set_user_data (hb_draw_funcs_t *dfuncs,
+			     hb_user_data_key_t *key,
+			     void *              data,
+			     hb_destroy_func_t   destroy,
+			     hb_bool_t           replace);
+
+
+HB_EXTERN void *
+hb_draw_funcs_get_user_data (const hb_draw_funcs_t *dfuncs,
+			     hb_user_data_key_t       *key);
+
 HB_EXTERN void
 hb_draw_funcs_make_immutable (hb_draw_funcs_t *dfuncs);