Andrii VolkovandClaude Opus 5.5 52eb736241 perf(render): look each layer up once per render ...

Node lookups in the document's B-tree were still a third of a render on a
900 000-layer file: a small subtree was walked for its bounds, again to
see whether it could be splatted, and again to splat it, and each child
of a drawn layer was looked up by paint_runs, by the mask check and by
draw_node.

- The render's table also keeps the layers it looked up, keyed with a
  multiply hash instead of SipHash (ids are counters), and so do the
  bounds it keeps.
- draw_children looks each child up once, works out the paint runs from
  those (Document::paint_runs_of) and draws the child it has.
- Whether a layer can be splatted is kept like its bounds: layers with
  children only, answers the nesting cap decided aren't kept, and kept
  answers are read only where their levels fit under the cap.

Ctx gets a second lifetime, for the document the kept layers come from.

Single-threaded cycles per 1440x900 render fitted to the page: 0.39 ->
0.34 G on a page of 246 204 layers, 0.26 -> 0.22 G on one of 118 358.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YQxjkNSUJhTkTfY74aNeki

2026-10-16 13:20:53 +03:00

..

src

perf(render): look each layer up once per render

2026-10-16 13:20:53 +03:00

Cargo.toml

M3: embedded image colour profiles (#136)

2026-10-12 00:11:43 +07:00