Brandon DeRosier 7c0bad1009 [Impeller] Limit subpass textures and backdrop blurs to the current clip (flutter/engine#42039)
Part of https://github.com/flutter/flutter/issues/126696.

* Generalize the FilterContents coverage hint as a Contents property.
* Incorporates the stencil coverage when creating subpass textures.
* Set a coverage hint for backdrop filters.
* Incorporate the coverage hint in the 2-pass Gaussian blur.
2023-05-15 12:18:08 -07:00
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