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# VTPixelRotationSessionInvalidate(_:)

Tears down a pixel rotation session.

```
func VTPixelRotationSessionInvalidate(_ session: VTPixelRotationSession)
```

## Parameters

`session`

The pixel rotation session to invalidate.

## Discussion

When a pixel rotation session’s retain count reaches zero, the system automatically invalidates it. However, because other processes may retain a session, it can be hard to predict when the invalidation occurs. Calling this function ensures a deterministic, orderly teardown.

---

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