let (ref_tiles, cur_tiles) = self.tiles.split_at_mut(tile_no);
let tile = &mut cur_tiles[0];
if plane_no != 0 || band_no != 0 {
let (ref_tiles, cur_tiles) = self.tiles.split_at_mut(tile_no);
let tile = &mut cur_tiles[0];
if plane_no != 0 || band_no != 0 {