hb_ot_layout_lookup_would_substitute

function hb_ot_layout_lookup_would_substitute(

  face: Phb_face_t;

  lookup_index: guint;

  glyphs: Phb_codepoint_t;

  glyphs_length: guint;

  zero_context: Thb_bool_t

):Thb_bool_t;