# withCVPixelBuffer(readOnly:body:) Calls the given closure with a locked 32-bit BGRA Core Video Pixel Buffer. ``` func withCVPixelBuffer(readOnly: Bool, body: (CVPixelBuffer) -> Void) ``` ## Parameters `readOnly` A Boolean value that specifies whether the function locks the with the flag. If the closure doesn’t modify the data, set this parameter to `true`. `body` A closure with a parameter that points to the underlying pixel buffer image data. ## Discussion Use this function to pass a vImage pixel buffer to other frameworks. For example, the following code creates a Core Image instance from a that shares its underlying storage with a pixel buffer: ```swift let src = vImage.PixelBuffer( size: vImage.Size(width: 64, height: 64)) src.withCVPixelBuffer(readOnly: false) { cvPixelBuffer in let ciImage = CIImage(cvImageBuffer: cvPixelBuffer) // Core Image workflow using `ciImage` } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)