3 people 9b231f241d perf(render): undo TIFF predictor 2 a byte row at a time at 8 and 16 bits (#6505) ...

TIFF predictor 2 (ISO 32000-2 §7.4.4.4, Table 10) went through the
bit-level BitChunks/BitWriter path for every bit depth, re-reading the
previous output pixel through a new BitReader per pixel. Whole-byte
samples (8 and 16 bits per component) are now undone on byte slices,
each sample added to the same component of the pixel to its left,
wrapping at its width; 1-, 2- and 4-bit samples keep the bit-level path.
The output is byte-identical, including the dropped partial last row.

A page of 45 full-page 8-bit grey images so predicted (PDFBOX-1350)
renders in about 4 s instead of 23 s with the same pixels.

Vendored hayro-syntax patch 42.


Claude-Session: https://claude.ai/code/session_01Pq7HyDBXygTf7jcqdsjcfn

Co-authored-by: mtlcl410 <chuanlin@niar.org.tw>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

2026-11-09 08:29:44 +08:00

..

examples

chore: resolve SonarCloud maintainability issues (#4356)

2026-10-23 23:28:18 -04:00

src

perf(render): undo TIFF predictor 2 a byte row at a time at 8 and 16 bits (#6505)

2026-11-09 08:29:44 +08:00

tests/it

M2: a shrunk image on a turned or mirrored page snaps to whole pixels (#5530) (#5640)

2026-11-01 15:07:29 -05:00

Cargo.toml

redact: treat unusable /QuadPoints as absent in every reader

2026-11-07 03:04:51 -06:00