Brandon DeRosier 273bb77b61 [Impeller] Add generic path for mask blurring (flutter/engine#42308)
Resolves https://github.com/flutter/flutter/issues/127013.

Makes mask blurs work for most color source + geometry combinations.
Crucially, this doesn't interfere with the fast paths for solid color
RRect blurs (used for shadows).

I'll be addressing mask blurs for text in a follow-up.
2023-05-25 09:31:20 -07:00
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