---
title: "readBytes(_:dataLayout:bytesPerRow:bytesPerImage:region:featureChannelInfo:imageIndex:)"
framework: metalperformanceshaders
role: symbol
role_heading: Instance Method
path: "metalperformanceshaders/mpsimage/readbytes(_:datalayout:bytesperrow:bytesperimage:region:featurechannelinfo:imageindex:)"
---

# readBytes(_:dataLayout:bytesPerRow:bytesPerImage:region:featureChannelInfo:imageIndex:)

## Declaration

```swift
func readBytes(_ dataBytes: UnsafeMutableRawPointer, dataLayout: MPSDataLayout, bytesPerRow: Int, bytesPerImage: Int, region: MTLRegion, featureChannelInfo: MPSImageReadWriteParams, imageIndex: Int)
```