LayerGeometry

Description#

Backend-agnostic geometry a layer atom publishes for rendering. A discriminated union: each variant carries exactly the primitives its kind needs, and nothing more. Both the SVG self-render path and the Canvas renderer paint against this same shape, so a single layer-authoring API drives either backend.

Coordinates are already scale-projected (pixel space); color is null when the atom defers to its CSS custom property (the SVG path reads the var directly, the Canvas renderer resolves it via getComputedStyle).