hb_ot_layout_lookup_get_glyph_alternates

function hb_ot_layout_lookup_get_glyph_alternates(

  face: Phb_face_t;

  lookup_index: guint;

  glyph: Thb_codepoint_t;

  start_offset: guint;

  alternate_count: Pguint;

  alternate_glyphs: Phb_codepoint_t

):guint;