///|
/// The delta LF accumulator is tile-local and updates at the same SB origin
/// as delta-Q. Mono multi-delta streams code only Y vertical and horizontal.
fn av1_read_superblock_delta_lf(
  decoder : Av1SymbolDecoder,
  state : Av1IntraState,
) -> Unit {
  if !state.delta_lf_present {
    return
  }
  let count = if state.delta_lf_multi {
    if state.monochrome {
      2
    } else {
      4
    }
  } else {
    1
  }
  for k in 0.. 63 {
      63
    } else {
      value
    }
  }
  if !state.delta_lf_multi {
    for k in 1..<4 {
      state.sb_lf_deltas[k] = state.sb_lf_deltas[0]
    }
  }
}