Function image::codecs::jpeg::encoder::copy_blocks_ycbcr

fn copy_blocks_ycbcr<I: GenericImageView>(
    source: &I,
    x0: u32,
    y0: u32,
    yb: &mut [u8; 64],
    cbb: &mut [u8; 64],
    crb: &mut [u8; 64]
)