IOSurface

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IOSurface is an object encompassing a kernel-managed rectangular pixel buffer in the IOSurface framework.

Converting IOSurfaces into normal images

Signature CGImageRef UICreateCGImageFromIOSurface(IOSurfaceRef ioSurface);
Available in 3.0 –
Signature -(id)initWithIOSurface:(IOSurfaceRef)ioSurface; // UIImage method.
Available in 3.0 –

In UIKit there are functions to convert an IOSurface to CGImage and UIImage.

References