Loads the current image data into an incrementally-loaded image representation and returns the current status of the image.
Original signature is '- (NSInteger)incrementalLoadFromData:(NSData *)data complete:(BOOL)complete'
Available in Mac OS X v10.2 and later.

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An integer constant indicating the status of the image during the load operation. See the discussion for details.

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