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# kCVImageBufferDisplayMaskRectangle_ReferenceRasterWidthKey

Specifies the width in pixels of the 2D coordinate system to define the rectangle.

```
let kCVImageBufferDisplayMaskRectangle_ReferenceRasterWidthKey: CFString
```

## Discussion

The `0,0` origin is the top-left corner.
The raster width value is a <doc://com.apple.documentation/documentation/CoreFoundation/CFNumber> of an unsigned 16-bit integer.
The value usually matches the width of the video or the output device.

---

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