---
title: rowBytes
framework: Application Services
role: symbol
role_heading: Instance Property
platforms: [macOS 10.0+]
path: applicationservices/pixmap/1462797-rowbytes
---

# rowBytes

The offset in bytes from one row of the image to the next. The value must be even, less than 0x4000, and for best performance it should be a multiple of 4. The high 2 bits of rowBytes are used as flags. If bit 15 =1, the data structure pointed to is a PixMap structure; otherwise it is a BitMap structure.

## Declaration

```swift
var rowBytes: Int16
```