if !is_4x4 || (hdr.dquant && hdr.ftype != FrameType::I && cbp != 0) {
let dq = br.read_code_signed(IntCodeType::Gamma)?;
let new_q = i32::from(sstate.q) + dq;
if !is_4x4 || (hdr.dquant && hdr.ftype != FrameType::I && cbp != 0) {
let dq = br.read_code_signed(IntCodeType::Gamma)?;
let new_q = i32::from(sstate.q) + dq;
if hdr.dquant && cbp != 0 {
let dq = br.read_code_signed(IntCodeType::Gamma)?;
let new_q = i32::from(sstate.q) + dq;
if hdr.dquant && cbp != 0 {
let dq = br.read_code_signed(IntCodeType::Gamma)?;
let new_q = i32::from(sstate.q) + dq;