.zip(self.dbuf.chunks_exact(width)) {
for (dst, &src) in dline[left..][..width].iter_mut().zip(sline.iter()) {
if src != tpix {
.zip(self.dbuf.chunks_exact(width)) {
for (dst, &src) in dline[left..][..width].iter_mut().zip(sline.iter()) {
if src != tpix {