let dstride = dstfrm.stride[plane];
let dst = &mut dstfrm.data[dstfrm.offset[plane]..];
for (src, dst) in src.chunks(sstride).zip(dst.chunks_mut(dstride)).take(ha) {
let dstride = dstfrm.stride[plane];
let dst = &mut dstfrm.data[dstfrm.offset[plane]..];
for (src, dst) in src.chunks(sstride).zip(dst.chunks_mut(dstride)).take(ha) {