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Jonah Williams 3c6f5e10f2 [Impeller] remove capability to read from onscreen. (flutter/engine#47808) 
As discovered by @knopp in https://github.com/flutter/flutter/issues/131567#issuecomment-1678210475, this is actually reducing performance substantially when there are multiple blurs. In the case of https://github.com/flutter/flutter/issues/132735 , removing this capbility improves GPU performance from 400ms per frame to ~100 ms per frame.

Fixes https://github.com/flutter/flutter/issues/131567#issuecomment-1678210475

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  | Macrobench | Example App
-- | -- | --
TOT | 250 | 450
W/Out OnScreen | 203-187 | 125-109
W/Out Onscreen and Resolve | 203 | 125
2023-11-08 18:38:59 +00:00
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src/flutter
[Impeller] remove capability to read from onscreen. (flutter/engine#47808)
2023-11-08 18:38:59 +00:00