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'-adapt_bias' modulates the AC quantization bias per-block. * adds Encoder::AdaptiveBiasQuantizeBlock, dispatched with GetActiveQuantizeBlockFunc() * zero cost to the non-adaptive paths. JPEG only spends bits on coeffs' num_bits coding, mantissa isn't Huffman-coded. => adaptive bias only nudges coefficients at the threshold of power-of-two. And by an amount proportional to a per-block flat/normal/busy activity estimation.
* ClassifyBlockActivity() owns perceptual masking (flat/normal/busy tiers) -- separate from AdaptiveBiasQuantizeBlock's bit-cost-correct rounding at the 0-vs-1 survival edge. * Each piece's comment now justifies only its own concept. * Drop DCTCoeffs::bias_: written but never read.
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'-adapt_bias' modulates the AC quantization bias per-block.
JPEG only spends bits on coeffs' num_bits coding, mantissa isn't Huffman-coded.
=> adaptive bias only nudges coefficients at the threshold of power-of-two.
And by an amount proportional to a per-block flat/normal/busy activity
estimation.