Returns an NSBitmapImageRep object created from a Core Graphics image object.
Original signature is '- (id)initWithCGImage:(CGImageRef)cgImage'
Available in Mac OS X v10.5 and later.


- cgImage (IntPtr)
- A Core Graphics image object (an opaque type) from which to create the receiver. This opaque type is retained.

An NSBitmapImageRep object initialized from the contents of the Core Graphics image or nil if the NSBitmapImageRep couldn’t be created.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)