Function reversible_dwt53_first_level_from_block_samples 

pub fn reversible_dwt53_first_level_from_block_samples(
    block_samples: &[[i32; 64]],
    block_cols: usize,
    block_rows: usize,
    width: usize,
    height: usize,
) -> Result<ReversibleDwt53FirstLevel, &'static str>

Compute one exact reversible integer 5/3 level from already decoded block-local signed samples.