Function diffuse_fs

pub fn diffuse_fs(
    data: &mut [u8],
    width: i32,
    height: i32,
    x: i32,
    y: i32,
    depth: i32,
    error: i32,
) -> Result<()>

Floyd-Steinberg Method

Col0	Col1	Col2
	curr	7/16
3/16	5/48	1/16