Function clipRelativeRectToAbsoluteViewport
- clipRelativeRectToAbsoluteViewport(viewport, viewportAbsoluteRect, rect): Rect | null
 Parameters
- viewport: Viewport
 - viewportAbsoluteRect: readonly [number, number, number, number]
 - rect: readonly [number, number, number, number]
 
Returns Rect | null
Convert a Rect relative to a viewport into absolute coordinates, while making sure the the rectangle is clipped to the viewport's absolute rectangle.