Module overlay 

The OVERLAY placement rule every renderer keeps (src/overlay.ts in the TS package; fixtures/overlay-geometry.json locks it): an anchor box, the overlay’s size, the viewport and a preferred side → where it lands. OVERLAY_OFFSET px from the anchor on the preferred side, centred on the cross axis; FLIP when the preferred side has less room than needed and the opposite has more; then SHIFT on the cross axis to stay OVERLAY_PADDING inside the viewport.

Structs

OverlayPlacement

PlaceOptions

Rect

Size

Enums

OverlayAlign

OverlaySide

Constants

OVERLAY_OFFSET

OVERLAY_PADDING

Functions

place_overlay

Mirrors placeOverlay exactly (the TS rounds to 3 decimals).