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Author SHA1 Message Date
Brandon Thomas ec6637f238 M5.4b: faster raw path — bin previews/thumbnails straight from the mosaic 
- lightcraft-raw: RawImage::develop_binned(k) — k×k superpixel binning of the CFA
  (Bayer k even, X-Trans k multiple of 3), black/white normalised row by row, default
  crop only, clipping preserved for highlight reconstruction. 2560 px previews of a
  24 MP raw bin 2×, thumbnails 4–8×; exports / 1:1 still demosaic (AHD) at full size.
- highlight::reconstruct and its pyramid fill are rayon-parallel (bit-exact).
- X-Trans directional demosaic: precomputed per-phase neighbour offsets and no
  reflection in the interior, no per-pixel allocation (bit-exact, tested against the
  reference formulation): 2.9 s → 0.75 s CPU at 24 MP.
- files::load_bytes runs on a rayon worker so its short parallel loops don't each
  wait for the pool to wake (dominant cost on a loaded machine); LIGHTCRAFT_PROFILE
  prints per-stage source timings; files::bin_factor picks the block size.
- render_bench ONLY=source: per-file decode / normalise / demosaic / binning / load.
- Fix: u64 overflow on hostile IFD sizes in DNG/ARW/NEF raw-IFD selection (proptest).

load_bytes(2560) CPU time, ARW a7 III 24 MP: 2347 → 240 ms; X-T20: 3120 → 1220 ms.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
 2026-10-01 09:01:53 -04:00
Brandon Thomas 07359a735e M3.8: embedded previews for every raw container + engine fallback; raw corpus 
- embedded_preview: CR3 PRVW/THMB boxes (plus RAF, RW2, ORF, PEF from the
  format commits); stops at the first valid box of each kind
- engine: raw variants that report Unsupported are probed and shown from
  their embedded JPEG (orientation from the JPEG or the raw), not an error
- crates/raw/tests/corpus.rs: every corpus/raw file is recognised, has a
  JPEG preview (DNG optional) and decodes or is a known-unsupported
  variant; prints decode timings
- xtask corpus --download: 37 CC0 raw.pixls.us samples (matched by SHA-256)
- ROADMAP/crate docs: format coverage, NEF Huffman / RW2 format 4 /
  compressed ORF+RAF gaps, neutral colour-matrix fallback

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
 2026-10-01 00:40:09 -04:00
Brandon Thomas 05450c791c M3.2-M3.6: lightcraft-raw DNG, LJ92, demosaic, highlights, DNG colour 
- LJ92 (T.81 process 14) decoder + Annex K encoder: predictors 1-7,
  1-4 components, 2-16 bit, point transform, restart intervals
- DNG: uncompressed (packed 1-16 bit, 16/24/32-bit float), LJ92 tiles/
  strips, Deflate with predictors 2/3/34892-34895; CFA + LinearRaw;
  linearization, BlackLevelRepeatDim/Delta, WhiteLevel, ActiveArea,
  DefaultCrop; colour tags; OpcodeList1-3 parse/write/apply
- DNG writer (uncompressed / LJ92 tiles) for export and round trips
- demosaic: bilinear, PPG, AHD (Hirakawa-Parks), X-Trans directional
- highlight clip/reconstruct; DNG colour model with dual illuminant,
  forward matrices, as-shot neutral -> xy, Rec.2020 transform
- embedded preview extraction; malformed-input proptests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
 2026-09-30 11:33:19 -04:00