fmt.get_chromaton(1).unwrap().get_offset() as usize,
fmt.get_chromaton(2).unwrap().get_offset() as usize];
let stride = buf.get_stride(0);
fmt.get_chromaton(1).unwrap().get_offset() as usize,
fmt.get_chromaton(2).unwrap().get_offset() as usize];
let stride = buf.get_stride(0);