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  feat(render): a reduced column can be graded by dwell, not drawn as one flat band

  martino released this 2026-10-06 03:02:36 +02:00 | 21 commits to main since this release

  A pixel column reduced from a dense envelope is honest about where the signal
  went and silent about how long it was there: its min and max are identical
  whether its samples fill the span or pile at its two ends, so a ramp and a pulse
  are one band. Style::intensity_grading grades it instead -- bright where the
  signal sits, faint where it only passes through -- by asking the gather for a
  level finer than the pixel grid and reading the distribution from those
  sub-buckets. Off by default: a change of look, not a correction of one.

  The measure is dwell per row, each segment depositing one unit spread over the
  rows it spans; counting +1 per row instead grades a sine's fast middle as
  brightly as its rails, which is the pattern inverted. The accumulator is one
  column wide (a full w*h density image is 33 MB at 4K) with each span written as
  two delta writes, and normalisation is against the column's own peak -- a
  frame-wide scale fades the trace out exactly where it moves fastest. Alpha is
  quantised into tiers, one LineBatch and one draw call each, because the line
  pipeline's colour is a uniform and a per-segment alpha is inexpressible.

  The finer ask is floored at level 1 whenever the flat path would have used the
  pyramid: level_for() answers 0 -- raw samples -- as soon as a sub-column falls
  under one bucket, so an unfloored ask turns a moderately dense frame into an
  O(visible) gather (measured at 172 samples a pixel: raw=1154 lod=0 and 6.4 ms a
  frame against raw=710 lod=453 and 2.3 ms). Grading is a way of drawing a
  reduction and may not undo it.

  Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

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