Function sixel_sys::sixel_dither_initialize

pub unsafe extern "C" fn sixel_dither_initialize(
    dither: *mut Dither, 
    data: *mut c_uchar, 
    width: c_int, 
    height: c_int, 
    pixelformat: PixelFormat, 
    method_for_largest: MethodForLargest, 
    method_for_rep: MethodForRepColor, 
    quality_mode: QualityMode
) -> Status