Function Tk_ComputeTextLayout 

pub unsafe extern "C" fn Tk_ComputeTextLayout(
    font: Tk_Font,
    str_: *const c_char,
    numChars: c_int,
    wrapLength: c_int,
    justify: Tk_Justify,
    flags: c_int,
    widthPtr: *mut c_int,
    heightPtr: *mut c_int,
) -> Tk_TextLayout