Saving an image with toDataURL or getImageData

[boogie666]

Hi thank you for the great lib, it's a life saver :)

Would it be possible to get one of these two function in? I'd be happy to help, however i don't know ios (nor do i own a mac) so i could only help with the android implementation.

P.S. I notice that the api docu says that "getImageData" is already in, but the api does not seem to be exposed (at least not in the react-native brige).

Best Regards