let mask_bits = &src[hdr_size..][..mask_size];
let index_bytes = &src[hdr_size+mask_size..];
validate!(src.len() >= hdr_size + mask_size);
- self.vert_pred.truncate(0);
+ self.vert_pred.clear();
self.vert_pred.resize(out_width, 0);
if is_intra || is_sprite {