mtlcl410andClaude Opus 5.5 2627384757 fix(render): images and nested groups knock out in a knockout group too (#2971) ...

An image or a nested group is drawn into a layer of its own, which
covers the whole canvas (transparent where nothing was drawn), so it
can't be composited with Compose::Copy. What is under its shape is
now cleared first and the layer then composites over it:

- an unmasked image's shape is its placement rectangle: the
  interpreter hands it to the device (`Device::knockout_shape`), which
  clears it with a transparent Copy fill;
- a nested group's shape is the union of its elements' shapes: the
  interpreter draws its content once in the device's erase mode
  (`knockout_erase_wanted`, `begin_knockout_erase`,
  `end_knockout_erase`), where every paint clears under its shape and
  nothing is layered or drawn as an image, and then draws the group,
  always in a layer of its own (drawn straight onto the knockout
  group, its own elements knocked each other out).

A masked image's shape is its mask; it composites as before, which
matches MuPDF where the mask is opaque or transparent.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RUNQSPVXx3dDBabRZHAnjz

2026-10-19 15:37:30 +08:00

..

examples

M2: heavy-sheet generator and page timing harness (item 8 of storytold/pdfcraft#623) (#2042)

2026-10-15 02:40:26 -04:00

src

fix(render): images and nested groups knock out in a knockout group too (#2971)

2026-10-19 15:37:30 +08:00

tests

M2: Bound literal text search with prefix matching (#1725)

2026-10-15 02:21:53 -04:00

Cargo.toml

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

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