NetterSilverandClaude Opus 5.5 ffa127c615 Skip per-character table lookups for plain text in layout and PDF export ...

Shortcuts that give the same answers as the lookups they skip:

- is_rtl: nothing before U+0590 is right to left, so Latin, Greek and
  Cyrillic text skips the bidi class search.
- strong_rtl and is_mark: ASCII letters are the only strong ASCII
  characters, and no ASCII character is a mark.
- cluster_starts: in ASCII text every character starts a grapheme except LF
  after CR, and no ASCII character joins a cluster.
- display lines: a glyph run's vectors and text are sized up front, and the
  symbol-font check is made once per run instead of once per cluster.
- PDF glyph runs: the baseline (the y most glyphs share) is only worked
  out for italic runs, the only ones that use it, and a run on one baseline
  returns it without counting.

Tests check each shortcut against the full lookup (every code point for the
bidi classes, every ASCII pair for the clusters).

PDF export of the export_bench document, interleaved with main: median
293 ms -> 241 ms (-18 % with the previous commit). The PDF bytes are
identical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-27 13:39:09 +01:00

..

src

Skip per-character table lookups for plain text in layout and PDF export

2026-10-27 13:39:09 +01:00

Cargo.toml

Pictures: one decoder checks the header against the budget, progressive JPEG coefficients included (#3644)

2026-10-24 18:01:45 -01:00