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Matt Boetger 189a5db70b
Use Async SurfaceHolder Callback to remove need for setting alpha workaround (#171398) 
We can rely on the SurfaceHolder.Callback2 method,
surfaceRedrawNeededAsync to properly signal the below Surface that
rendering of the frame is done, and the Surface can be finished drawing.
This removes the need to set the alpha to prevent the blank surface from
being rendered before the engine is done.

Fixes: #140246

## Pre-launch Checklist

- [X] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [X] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [X] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [X] I signed the [CLA].
- [X] I listed at least one issue that this PR fixes in the description
above.
- [X] I updated/added relevant documentation (doc comments with `///`).
- [X] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [X] All existing and new tests are passing.
2025-07-09 23:02:11 +00:00
..
scripts
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src
Use Async SurfaceHolder Callback to remove need for setting alpha workaround (#171398)
2025-07-09 23:02:11 +00:00
README.md
…

README.md

Flutter Engine

Setting up the Engine development environment

See here

gclient bootstrap

Flutter engine uses gclient to manage dependencies.

If you've already cloned the flutter repository:

  1. Copy one of the engine/scripts/*.gclient to the root folder as .gclient:
    1. Googlers: copy rbe.gclient to enable faster builds with RBE
    2. Everyone else: copy standard.gclient
  2. run gclient sync from the root folder