hb_ot_layout_feature_get_characters

function hb_ot_layout_feature_get_characters(

  face: Phb_face_t;

  table_tag: Thb_tag_t;

  feature_index: guint;

  start_offset: guint;

  char_count: Pguint;

  characters: Phb_codepoint_t

):guint;