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# kCTFontMatrixAttribute

The font transformation matrix when creating a font.

```
let kCTFontMatrixAttribute: CFString
```

## Discussion

If unspecified it defaults to the unit matrix. The value for this key is a <doc://com.apple.documentation/documentation/CoreFoundation/CFData> object containing a <doc://com.apple.documentation/documentation/CoreFoundation/CGAffineTransform> object.

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