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UnPremultiplyEffectInvalidateSourceRectangle Method
Notifies the effect that one of its source images has changed.

Namespace:  Microsoft.Graphics.Canvas.Effects
Assembly:  Microsoft.Graphics.Canvas (in Microsoft.Graphics.Canvas.dll) Version:

When CacheOutput is enabled, this method can be used to invalidate the cache.

It is also used to populate a list of invalid regions which are propagated through the effect graph, mapped from source to output coordinate systems, and can then be queried by GetInvalidRectangles(ICanvasResourceCreatorWithDpi).

See Also