hb_ot_layout_language_get_feature_indexes

function hb_ot_layout_language_get_feature_indexes(

  face: Phb_face_t;

  table_tag: Thb_tag_t;

  script_index: guint;

  language_index: guint;

  start_offset: guint;

  feature_count: Pguint;

  feature_indexes: Pguint

):guint;