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[Impeller] Minimally crop advanced blends in EntityPass #34347
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dnfield
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Jun 28, 2022
bdero
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The default behavior for the blend filter is to union the coverage of all the inputs. Without this change, the advanced blend filter's output ends up always being the full size of the input destination texture. This is wasteful because EntityPass immediately blits the blend filter's output back onto the pass backdrop texture, and so for non-destructive blends, we only need to compute the blend within the source input's coverage.
Add
FilterContents::SetCoverageCrop()and use it inEntityPassto exclude the backdrop texture coverage for advanced blends.Note that all destructive blend modes (Clear, Source, SourceIn, DestinationIn, SourceOut, DestinationATop, and Modulate) are pipeline blends, and so this cropping behavior should always be safe.