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# kCVImageBufferDisplayMaskRectangle_RectangleWidthKey

Specifies the width of the rectangle starting at the rectangle’s left offset toward the rectangle’s right edge.

```
let kCVImageBufferDisplayMaskRectangle_RectangleWidthKey: CFString
```

## Discussion

The width value is a <doc://com.apple.documentation/documentation/CoreFoundation/CFNumber> of an unsigned 16-bit integer.

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