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perf: use direct gradient decode path in SingleGradientOnly #738

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Merged
veluca93 merged 1 commit into from
Apr 13, 2026
Merged

perf: use direct gradient decode path in SingleGradientOnly #738

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8 changes: 6 additions & 2 deletions jxl/src/frame/modular/decode/specialized_trees.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -348,9 +348,13 @@ impl ModularChannelDecoder for SingleGradientOnly {
br: &mut BitReader,
histograms: &Histograms,
) -> i32 {
let pred = Predictor::Gradient.predict_one(prediction_data, 0);
let pred = clamped_gradient(
prediction_data.left as i64,
prediction_data.top as i64,
prediction_data.topleft as i64,
);
let dec = reader.read_signed_clustered_inline(histograms, br, self.clustered_ctx);
make_pixel(dec, 1, pred)
dec.wrapping_add(pred as i32)
}
}

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