pub unsafe extern "C" fn pango_glyph_string_x_to_index(
    glyphs: *mut PangoGlyphString,
    text: *const c_char,
    length: c_int,
    analysis: *mut PangoAnalysis,
    x_pos: c_int,
    index_: *mut c_int,
    trailing: *mut c_int
)