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# CGDisplayStreamUpdateRectType

Use these constants to determine which rectangles your app is interested in.

```
enum CGDisplayStreamUpdateRectType
```

## Topics

### Constants

[`CGDisplayStreamUpdateRectType.refreshedRects`](/documentation/CoreGraphics/CGDisplayStreamUpdateRectType/refreshedRects)

The rectangles for the portions of the display that were redrawn.

[`CGDisplayStreamUpdateRectType.movedRects`](/documentation/CoreGraphics/CGDisplayStreamUpdateRectType/movedRects)

The rectangles for the portions of the display that were simply moved from one part of the display to another.

[`CGDisplayStreamUpdateRectType.dirtyRects`](/documentation/CoreGraphics/CGDisplayStreamUpdateRectType/dirtyRects)

The union of both rectangles that were redrawn and rectangles that were moved.

[`CGDisplayStreamUpdateRectType.reducedDirtyRects`](/documentation/CoreGraphics/CGDisplayStreamUpdateRectType/reducedDirtyRects)

The union is calculated and then simplified. This reduces the number of rectangles returned to your app, but it may report some pixels that were not actually changed.


---

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