KenM76andClaude Opus 5.5 ad33ab626e fix(render): a non-isolated knockout group blends its elements with the page under it ...

A non-isolated knockout group starts from the backdrop under it (ISO 32000-2
§11.4.7, §11.4.8), but was drawn into a layer of its own starting transparent,
so a blend mode inside it had nothing to blend with: white with /BM /Difference
over magenta stayed white (#4886).

Entered plainly (full opacity, no soft mask, Normal, not itself a knockout
element), the group is now drawn once per blend mode its elements use. Each pass
is a knockout layer composited onto the backdrop in that mode; elements of other
modes clear what is under their shape instead of painting. The Normal pass finds
the other modes, so a group without blend modes takes one pass as before.

hayro-interpret patch 67 (Device::begin_knockout_pass / end_knockout_pass,
draw_knockout_passes), hayro patch 26 (the renderer side). Test:
pdfcraft-render it::knockout_backdrop, three cases failing with the fix
reverted, plus an isolated-group control.

Fixes #4886

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9

2026-10-26 20:18:32 -04:00

..

examples

chore: resolve SonarCloud maintainability issues (#4356)

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

src

Merge origin/main into fix/comment-threads-by-irt

2026-10-24 20:42:11 +02:00

tests/it

fix(render): a non-isolated knockout group blends its elements with the page under it

2026-10-26 20:18:32 -04:00

Cargo.toml

Reading colours: replace document colours for reading comfort (#897) (#1270)

2026-10-12 02:49:31 -04:00