# init(data:width:height:byteCountPerRow:pixelFormat:) Calculates the correct bytes per row and returns a new buffer that references existing data. ``` init(data: UnsafeMutableRawPointer, width: Int, height: Int, byteCountPerRow: Int? = nil, pixelFormat: Format.Type = Format.self) ``` ## Parameters `data` A pointer to the top-left pixel of the buffer. `width` The width, in pixels, of the pixel buffer. `height` The height, in pixels, of the pixel buffer. `byteCountPerRow` The number of bytes in a pixel row. `pixelFormat` The pixel format of the initialized buffer. ## Discussion Pass `nil` to `byteCountPerRow` to have the function calculate the bytes per row as `width * MemoryLayout.stride * T.channelCount`. For example, the following code creates a 32-bit planar pixel buffer: ```swift let data = UnsafeMutableBufferPointer.allocate(capacity: 10) _ = data.initialize(from: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] as [Float]) defer { data.deallocate() } let src = vImage.PixelBuffer(data: data.baseAddress!, width: 5, height: 2, byteCountPerRow: nil, pixelFormat: vImage.PlanarF.self) // Prints "[0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0]". print(src.array) ``` > Important: > The pixel buffer is valid only for the lifetime of `data`. --- 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)