feat: Use `setExternalMemoryPressure` to notify JS VM about `Frame`'s actual size (on GPU)

[mrousavy]

What

Uses setExternalMemoryPressure to notify the JS VM about the Frame's actual size (the byte buffer on the GPU, which is bytesPerRow * height).

If the JS VM (e.g. Hermes) knows the true size of the Frame in memory, it will delete old stale FrameHostObjects sooner instead of just keeping them floating around in memory because it thinks it's just a few bytes in size. (right now around 400 of those pile up until GC hits, with this PR only 3 pile up at a time)

This doesn't really matter for us since we need to eagerly delete the Frame after the Frame Processor is done, because the Camera pipeline stalls otherwise.

So we still need to keep the manual ref counting stuff. Make sure to use it properly!

Changes

Tested on

Related issues

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Name	Status	Preview	Comments	Updated (UTC)
react-native-vision-camera	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2024 0:40am