3 people 3f25d55a96 M11: measure every use of an image drawn through deeply nested forms (#1811) (#1933) ...

The effective-resolution walk skipped any form XObject already visited
once when it was nested more than four deep, with one seen-set for the
whole document. A later, larger use of the same form was never measured,
so Reduce File Size and Optimize PDF resampled the image for its smallest
use: a 1200 px image drawn 1 in and 8 in wide through six nested forms
came out 150 px wide, about 19 ppi on the large copy.

- Cycles are detected on the current path of forms, not document-wide.
- A form with its own resources drawn again at the same scale (only
  moved) is skipped, as that can't change any image's resolution; forms
  without resources draw their caller's images and are always walked.
- Repeat walks are capped at 100,000. If the cap or the 12-level depth
  limit leaves a use unmeasured, every image gets INFINITY: recompressed
  as the settings say, never resampled.

Fixes #1811

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>

2026-10-15 02:30:30 -04:00

..

optimize.rs

M11: measure every use of an image drawn through deeply nested forms (#1811) (#1933)

2026-10-15 02:30:30 -04:00