pub unsafe extern "C" fn pango_shape_item(
    item: *mut PangoItem,
    paragraph_text: *const c_char,
    paragraph_length: c_int,
    log_attrs: *mut PangoLogAttr,
    glyphs: *mut PangoGlyphString,
    flags: PangoShapeFlags
)
Available on crate feature v1_50 only.