tree 30619ff5b7a3649fb710ee7a1d5136211244e955
parent 93331f8b519ebb8a2fdcacc56f52d5a51f3d62c3
author Gabriel Peal <gpeal@users.noreply.github.com> 1683595579 -0700
committer GitHub <noreply@github.com> 1683595579 -0700
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[Async Updates] First MVP of Async Updates (#2276)

This is the first MVP of async updates. This project is being funded by Airbnb Eng and likely wouldn't happen without their sponsorship.

The docs for the AsyncUpdates enum includes details on what is going on here but at a high level, Lottie has two hot paths:
1. setProgress
2. draw

This allows the former to happen off of them main thread _ immediately after_ draw completes so it is ready before the next one starts.

In many of my tests, the two paths were each accountable for ~50% of the total main thread work so this could reduce the main thread activity by ~50% or more.

Here is an example of systrace before:
<img width="1258" alt="CleanShot 2023-04-09 at 15 24 34@2x" src="https://user-images.githubusercontent.com/1307745/230800026-d73bf779-a109-46ee-9396-a54753860be4.png">

You can see setProgress being called immediately before draw.

This is what it looks like with async updates enabled:
<img width="1258" alt="CleanShot 2023-04-09 at 15 23 35@2x" src="https://user-images.githubusercontent.com/1307745/230800035-c6a2e02a-f47e-4cac-9394-4239ae27c524.png">

You can see that draw happens first and then setProgress for the _next frame_ happens immediately after on a different thread.

This is experimental and defaults to AUTOMATIC but AUTOMATIC will default to false until this API is stabilized.