Akiba So 6c2dd71b82 feat(pen): brush opacity + highlighter multiply ...

Honor each brush's opacity/blend so the brushes feel distinct
(closes TODO(brush-opacity)).

- Shared paint resolver: a stroke's color alpha is multiplied by its
  brush opacity; ballpoint/pencil opacity is tied to pressure
  (per-stroke average this increment) so a ballpoint reads lighter
  than a solid fountain pen.
- Highlighter paints with BlendMode.multiply and draws once, so
  cross-stroke overlap darkens like a real marker while self-overlap
  doesn't.
- Applied across BOTH render paths (PenCanvas static/live painters and
  the PDF _PageOverlayPainter).

Pencil paper-grain texture still deferred (TODO brush-texture); brush
kind is not yet serialized (TODO brush-persist — next). analyze clean,
tests green.

2026-06-24 23:27:11 +08:00

8.2 KiB

Raw Blame History

View Raw