tree f2130367faac02d6daddc12017663bc270431148
parent 44f8a43687ca2087ba343e4c2bee43a59bfc6a29
author Jonah Williams <jonahwilliams@google.com> 1699468739 -0800
committer GitHub <noreply@github.com> 1699468739 +0000
gpgsig -----BEGIN PGP SIGNATURE-----
 
 wsBcBAABCAAQBQJlS9XDCRBK7hj4Ov3rIwAAcncIACc/75f78W5y6a4/A7IHVPku
 bhS/hLeJMXdt8/IVzSuId+CSZNTW2Owp9/NzYbLZBMzaYRtdUvFTOUCF3JA4xHQx
 yhqQeP/vthmcthPv76Jg8hz4/qxphZFOPQUkbxvgReBBfAH1IQlT4MqARbsQY06Z
 usr068tsmH5naU11ScYc2xJ3gPpHEz+SqEmFbubm98Pm+HNp7MacrxlNIFKyIICK
 gbyVyjD1P1w/mnKM8R/XIgwpfC3crrPPH4Dh8QYd1DQC2QxUQIfpxGSnfcZMTke8
 D5S0xXbBBtdyb+ysN0QM2AiDGWvP8nR6VQVKmGX5022QuSwJ37ig3sR3zX4ANes=
 =rqj2
 -----END PGP SIGNATURE-----
 

[Impeller] remove capability to read from onscreen. (#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

-----

Â  | Macrobench | Example App
-- | -- | --
TOT | 250 | 450
W/Out OnScreen | 203-187 | 125-109
W/Out Onscreen and Resolve | 203 | 125