Function UAZoomEnabled 

pub unsafe extern "C-unwind" fn UAZoomEnabled() -> bool

Available on crate feature UniversalAccess only.

Determines if the Universal Access zoom feature is enabled.

Returns: Returns true if the Universal Access zoom feature is on, false if the zoom feature is off or if the user has zoomed all the way out. Availability: Available in Mac OS X v10.4 and later (not available in CarbonLib 1.x and not available for nonCarbon CFM).