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[Impeller] Limit coverage of all subpasses to the root texture #34246
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dnfield
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Jun 24, 2022
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Note: For some blend modes (Clear, Source, SourceIn, DestinationIn, SourceOut, DestinationATop, and Modulate), the pass coverage should always expand to cover the root pass. I'll be adding this in a follow-up (there are other scenarios where we don't behave quite correctly because of this). |
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Also factors the root pass coverage into the per-entity computation.
Consider a situation where the framework asks to render a path using an advanced blend, but the origin of the coverage of the path is -10000 pixels in the y direction for whatever reason. Absent of this change, the offscreen advanced blend texture ends up with a height of >11000 pixels. With this change, such an element will get excluded during the EntityPass coverage routine, which will cause the pass itself to have no coverage, which will cause the pass to get skipped.