---
title: "init(data:width:height:byteCountPerRow:pixelFormat:)"
framework: accelerate
role: symbol
role_heading: Initializer
path: "accelerate/vimage/pixelbuffer/init(data:width:height:bytecountperrow:pixelformat:)-27czc"
---

# init(data:width:height:byteCountPerRow:pixelFormat:)

Calculates the correct bytes per row and returns a new buffer that references existing data.

## Declaration

```swift
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

Discussion Pass nil to byteCountPerRow to have the function calculate the bytes per row as width * MemoryLayout<T.ComponentType>.stride * T.channelCount. For example, the following code creates a 32-bit planar pixel buffer:  let data = UnsafeMutableBufferPointer<Float>.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.

## See Also

### Creating a pixel buffer from raw pixel data

- [init(pixelValues:size:pixelFormat:)](accelerate/vimage/pixelbuffer/init(pixelvalues:size:pixelformat:).md)
- [init(data:width:height:byteCountPerRow:pixelFormat:)](accelerate/vimage/pixelbuffer/init(data:width:height:bytecountperrow:pixelformat:)-zwzz.md)