Brandon DeRosier 6828abffee [Impeller] Set the coverage hint on everything (flutter/engine#42264)
Attaches a minimum coverage hint to all rendered entities. This makes ImageFilter blurs do less work when clipped. We can utilize this in a number of other filters as well.

![Screenshot 2023-05-23 at 3 16 49 PM](https://github.com/flutter/engine/assets/919017/5b7182c8-e704-4c4a-bb71-fdf226a60f4e)

The test I added also demonstrates a sampling issue in the gaussian blur that I'm trying to work out. Here it is without any clipping. This coverage hint change does not introduce the issue:

![Screenshot 2023-05-23 at 3 08 15 PM](https://github.com/flutter/engine/assets/919017/524c2fb1-3b58-4589-824b-0794c2bd5ea2)
2023-05-24 02:06:19 +00:00
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