DiscardMissingTileImagePolicy

A policy for discarding tile images that match a known image containing a "missing" image.

Name Type Description

options

Object

Object with the following properties:

Name	Type	Default	Description
`missingImageUrl`	Resource \| String		The URL of the known missing image.
`pixelsToCheck`	Array.<Cartesian2>		An array of `Cartesian2` pixel positions to compare against the missing image.
`disableCheckIfAllPixelsAreTransparent`	Boolean	`false`	optional If true, the discard check will be disabled if all of the pixelsToCheck in the missingImageUrl have an alpha value of 0. If false, the discard check will proceed no matter the values of the pixelsToCheck.

Determines if the discard policy is ready to process images.

True if the discard policy is ready to process images; otherwise, false.

Given a tile image, decide whether to discard that image.

Name	Type	Description
`image`	HTMLImageElement	An image to test.

True if the image should be discarded; otherwise, false.

DeveloperError : shouldDiscardImage must not be called before the discard policy is ready.

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