Struct PreparedCanvasGeometry 

pub struct PreparedCanvasGeometry {
    pub world_transform: Affine,
    pub layer: usize,
    pub bounds: (f64, f64),
    pub surface_transform: Affine,
    pub coverage_bounds: Option<Rect>,
    pub local: CanvasGeometry,
    /* private fields */
}

Geometry shared by render selection, primitive drawing, and viewport observation. Native surfaces use a separate bounds lookup in the same geometry service. Observed layout-only targets and their ancestors share these records without entering either rendering index.

Coverage is in the owning canvas’s content coordinates, so native scrolling changes the queried region without invalidating every descendant record.

Fields

world_transform: Affine

Layout transform in unscrolled scene coordinates, shared with viewport observation.

layer: usize

Owning logical canvas layer.

bounds: (f64, f64)

Layout dimensions, kept separate from overflowing paint coverage.

surface_transform: Affine

Transform from primitive-local space to canvas content space.

coverage_bounds: Option<Rect>

Transformed paint coverage including the renderer’s conservative culling pad.

local: CanvasGeometry

Primitive-local geometry backing this prepared record.