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The maximum ratio between both active area width and crop region width, and active area height and crop region height, for CaptureRequest.ScalerCropRegion.
This represents the maximum amount of zooming possible by the camera device, or equivalently, the minimum cropping window size.
Crop regions that have a width or height that is smaller than this ratio allows will be rounded up to the minimum allowed size by the camera device.
Units: Zoom scale factor
Range of valid values:
>=1
This key is available on all devices.