const MASKS: [u8; 8] = [
    1,
    1 << 1,
    1 << 2,
    1 << 3,
    1 << 4,
    1 << 5,
    1 << 6,
    1 << 7,
    ];

const REV_MASKS: [u8; 8] = [
    1 << 7,
    1 << 6,
    1 << 5,
    1 << 4,
    1 << 3,
    1 << 2,
    1 << 1,
    1
    ];

pub enum Color{
    A,
    B,
    C,
    D,
}


pub fn from_bytes(upper: u8, lower: u8) -> [Color; 8] {
    let mut colors = [Color::A, Color::A, Color::A, Color::A,
                      Color::A, Color::A, Color::A, Color::A];
    let mask = if true {&MASKS} else {&REV_MASKS};
    for (dst, msk) in colors.iter_mut().zip(mask) {
        *dst = match (upper & msk !=0, lower & msk != 0) {
            (false, false) => Color::A,
            (true, false) => Color::B,
            (false, true) => Color::C,
            (true, true) => Color::D,
        };
    }
    colors
}