hb_font_create (hb_face_t *face);
hb_font_t *
+hb_font_create_sub_font (hb_font_t *parent);
+
+hb_font_t *
hb_font_reference (hb_font_t *font);
void
hb_bool_t
hb_font_is_immutable (hb_font_t *font);
+hb_font_t *
+hb_font_get_parent (hb_font_t *font);
hb_face_t *
hb_font_get_face (hb_font_t *font);