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M13.1/M13.2: paint (Brush, Clone Stamp, Eraser) and puppet pins

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Paint: non-destructive Paint effect with Brush/Clone/Eraser stroke groups
(Path, Stroke Options, Transform, Duration spans, Write On End keys),
dab rasterizer (diameter/angle/roundness/hardness/spacing/flow/opacity,
pressure dynamics, modes, channels), eraser modes, clone from layer/time,
cache keys include visible strokes. paint.stroke/options/brushPreset/
setCloneSource/removeStroke/presets. Layer panel with paint tools, Paint
and Brushes panels.

Puppet: Puppet effect with meshes and Position/Advanced/Bend/Starch/Overlap
pins; alpha contour -> expansion (exact EDT) -> simplified outline ->
Delaunay with constraint recovery; ARAP (Igarashi 2005) two-step solve with
CG; anti-aliased texture-mapped rendering with overlap depth. puppet.addPin/
movePin/setPin/removePin/mesh/info. Puppet tools in the viewer with mesh
overlay and header options.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Brandon Thomas
2026-10-02 09:12:10 -04:00
co-authored by Claude Opus 5.5
parent 5273f1ba96
commit d6f6a10757
28 changed files with 5062 additions and 15 deletions
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docs/architecture.md
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@@ -90,6 +90,15 @@ at composite time. Styled pixels are cached separately from the layer content, s
reuses the cached source/masks/effects. Global Light is one setting per comp, mirrored into every
layer's Blending Options and kept in step after each edit.
**Paint and Puppet** are effects whose instances carry nested groups. Paint (`effects::paint`)
holds Brush / Clone / Eraser strokes (Path, Stroke Options, Transform, hidden Duration span);
strokes rasterize as brush-tip dabs and composite in order, and the layer cache key includes which
strokes are visible at the frame. Puppet (`effects::puppet`) holds meshes and pins: the mesh is
traced from the input alpha, expanded, and triangulated (Delaunay + constraint recovery, cached
by content); pins drive an as-rigid-as-possible solve (Igarashi et al. 2005) each frame and the
input is texture-mapped through the deformed triangles. The renderer flattens nested effect
groups into `Params` keys (`effects::flatten_params`). Commands: `paint.*`, `puppet.*`.
Half, Third and Quarter resolution render proportionally fewer pixels end to end.
## 5. Expressions