Slightly Improve Graphics Performance #462
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The circular cropping mode has always used a
CALayermask to produce the circle clipping shape for the image. I originally did this since I didn't trustcornerRadiusto always provide a perfect circular shape.After watching Apple's latest Tech Talks on animation performance, they always recommend using
cornerRadiusovermaskbecause the performance gains are more significant than I realised.This PR swaps the circular mode using Core Animation masks to the regular corner radius API. If this introduces any regressions I've missed, please tell me.