Function dither_float_slice_2d 

pub fn dither_float_slice_2d<Src, Dest, M: SpatialRng>(
    values: &[Src],
    width: usize,
    method: &M,
) -> Vec<Dest>
where
    Src: DitherFloatConversion<Dest> + DitherFloat + CastableFrom<f64> + Copy + Send + Sync,
    Dest: Send,