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[Impeller] Use the fast rrect blur path for blurred circles/circular shadows #37094
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chinmaygarde
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Also, only copy the paint state when it needs to be modified.
Also also, I filed flutter/flutter#114184 to document that we need to make this not apply when the paint color source isn't solid color (this feature predates color sources and geometry).
Of course, the slow blur's downsampling behavior clearly still needs some fixing up too, as can be observed below ;)
Before:
After:
