pub unsafe extern "C" fn sixel_decode(
sixels: *mut c_uchar,
size: c_int,
pixels: *mut *mut c_uchar,
pwidth: *mut c_int,
pheight: *mut c_int,
palette: *mut *mut c_uchar,
ncolors: *mut c_int,
fn_malloc: MallocFn,
) -> Status