let hdr = br.parse_header(&mut bc)?;
validate!((hdr.offset as usize) < aoffset); //XXX: take alpha 3 byte offset into account?
- if hdr.mb_w != 0 {
+ if hdr.mb_w != 0 && (usize::from(hdr.mb_w) != self.mb_w || usize::from(hdr.mb_h) != self.mb_h) {
self.set_dimensions((hdr.mb_w as usize) * 16, (hdr.mb_h as usize) * 16);
}
let fmt = if !self.has_alpha {