Grzegorz MartensandClaude Opus 5.5 7add9b38e3 M11: the optimizer reads images through /DecodeParms given by reference ...

Stream::decoded reads only direct parameter dictionaries, so an image
whose /DecodeParms is a reference (whole, or as array entries) was
decoded without its predictor. For a 1-bit image with a PNG predictor
the rows came out shifted by their tag bytes, Group 4 of that was still
smaller, and the picture was replaced by a skewed one; resampling and
merging image strips read the same way.

pdfcraft_cos::Document::with_direct_parms gives the stream with the
parameters its filters use made direct: only the entries at the
filters' places, and none for a chain longer than any decoder takes,
so at most MAX_CHAIN objects are copied. The optimizer's pixels() and
the Group 4 step decode through it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BfMGHQNgdq5yf5tKZHGR3z

2026-10-29 20:47:39 +01:00

..

jpeg_color_transform.rs

style: rustfmt the cancellation test

2026-10-23 10:53:16 +02:00

optimize.rs

M11: the optimizer reads images through /DecodeParms given by reference

2026-10-29 20:47:39 +01:00