}
fn put_block(dst: &mut [u16], dstride: usize, block: &[u16; 16]) {
for (line, src) in dst.chunks_mut(dstride).take(4).zip(block.chunks(4)) {
}
fn put_block(dst: &mut [u16], dstride: usize, block: &[u16; 16]) {
for (line, src) in dst.chunks_mut(dstride).take(4).zip(block.chunks(4)) {