cc929700b6f83ba995f68d03f25b3f600f51cd08
The new method allows a caller to ask for the coverage of the input pixels required to produce an output that spans a given area. This allows the code to clip a saveLayer that has an image filter applied to it.
[Impeller] Add FilterContents::GetSourceCoverage to enable filtered saveLayer clipping. (flutter/engine#47183)
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