The problem isn't with your rotation logic - it's with the assumption that you're dealing with ARGB data.

If you're getting the buffer from the camera (which I suspect you are), it's actually in YUV format, not ARGB. That's why vImageRotate90_ARGB8888 crashes - you're telling it to rotate data in a format that doesn't match what's actually in memory.

There are two ways to fix this:

1. If you're dealing with camera buffers (YUV format):

• You need to rotate the Y and UV planes separately
• Each plane needs its own vImage rotation call
• Make sure to lock/unlock the buffers properly

2. For everything else:

• Skip vImage altogether and use VTImageRotationSession
• It's way more reliable and handles all the format stuff for you
• Less code and fewer crashes

The real gotcha here is that camera buffers are almost always YUV, not ARGB. Once you handle the planes correctly, the rotation works fine.