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BIF: reduced pyramid levels stitch-aligned with L0 — DP + legacy iScan (#83, #80)

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@github-actions github-actions released this 25 Jun 03:02
· 44 commits to main since this release
v0.55.0
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BIF reduced pyramid levels (DP and legacy iScan) are stitch-aligned with L0
(#83, #80).

Fixed

  • BIF reduced levels (L1+) now composite stitch-aligned with L0 (#83 DP, #80
    legacy iScan). The scanner stores reduced levels as the raw (un-compacted) frame
    grid downsampled, so their pixels carried the frame overlap (DP: ~overlap/2ⁱ
    residual at the frame-join seams — ~60px at L1 on Ventana-1, halving each deeper
    level; legacy iScan: dense ~11%). v0.53.0 corrected only DP's reported
    Level.Size; the layout stayed naive (and legacy Size stayed the raw frame
    grid), so a region / StitchedTile read crossing the L0↔L1 boundary still showed
    a content shift. Reduced levels now build their stitch layout by downsampling
    the L0 compacted layout     (reduced tile (col,row) inherits L0 frame
    (col<<i, row<<i)'s compacted origin, scaled by 1/2ⁱ) and report
    Level.Overlapping = true, so the existing regionLayout / compositeStitchedLoop
    path composites them with no compositor change. Legacy reduced Size now derives
    from the L0 stitched hull (floor-halved) too — matching openslide's L1 content
    extent within ~0.1% (OS-1 L1 52909 vs openslide ~52907), closing the
    #78-legacy deferral. Grid and tile bytes are unchanged.

Changed

  • BIF reduced levels now report Level.Overlapping = true (was false) for DP
    and legacy iScan slides whose L0 was overlap-compacted. Consumers that gate
    per-tile fast paths on Overlapping (the documented #71 contract) automatically
    route reduced-level pixel reassembly through the region API and get the
    stitch-aligned output. Consumers that ignored Overlapping and iterated Grid on
    reduced levels were already mis-stitching; they should adopt the contract.
  • Legacy iScan reduced-level Level.Size / Downsample changed to the stitched
    (floor-halved-hull) content extent (e.g. OS-1 L1 59392×51000 → 52909×46962).
    This is the openslide-matching value (within ~0.1%); the prior raw-frame-grid
    dimensions overstated the content. Tile bytes and Grid are unchanged.
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