Function bilinear_plane 

fn bilinear_plane(
    src: &[u8],
    sw: usize,
    sh: usize,
    sstride: usize,
    dst: &mut [u8],
    dw: usize,
    dh: usize,
    dstride: usize,
)

Separable bilinear resample of one plane (fixed point 16.16).