a PangoFontDescription to fill in with the current values. The family name in this structure will be set using [method@Pango.FontDescription.set_family_static] using values from an attribute in the PangoAttrList associated with the iterator, so if you plan to keep it around, you must call: pango_font_description_set_family (desc, pango_font_description_get_family (desc)).
if non-%NULL, location to store language tag for item, or %NULL if none is found.
if non-%NULL, location in which to store a list of non-font attributes at the the current position; only the highest priority value of each attribute will be added to this list. In order to free this value, you must call [method@Pango.Attribute.destroy] on each member.
Get the font and other attributes at the current iterator position.