This disclosure describes techniques for the determination of occluded and unoccluded spaces within a user interface. Per techniques of this disclosure, a viewport of a user interface is represented as a set of rectangles determined by recursive subdivision. The area of the viewport is based on a sum of the areas of each unoccluded rectangle in the set of rectangles. The efficient representation of the viewport with a small number of rectangles enables frequent recalculation of the viewport, e.g., even when the viewport is updated frequently in response to user actions such as scrolling.
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Anonymous, "Determining Viewport Area In User Interfaces With Occluding Elements", Technical Disclosure Commons, (July 02, 2020)