A policy for discarding tile images according to some criteria. This type describes an interface and is not intended to be instantiated directly.
isReady() → Boolean
Determines if the discard policy is ready to process images.
Returns:True if the discard policy is ready to process images; otherwise, false.
shouldDiscardImage(image) → Promise.<Boolean>
Given a tile image, decide whether to discard that image.
Name Type Description
Image | Promise.<Image> An image, or a promise that will resolve to an image.
Returns:A promise that will resolve to true if the tile should be discarded.