pub unsafe extern "C" fn hb_ot_layout_lookup_get_glyph_alternates(
face: *mut hb_face_t,
lookup_index: c_uint,
glyph: hb_codepoint_t,
start_offset: c_uint,
alternate_count: *mut c_uint,
alternate_glyphs: *mut hb_codepoint_t
) -> c_uint