ImageClip: copy base image. Improves performance in some cases. #2416
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Helps with performance in #2395 test to some extent.
If you check the
ndarray.flagsof certain frames, you see thatOWNDATAandC_CONTIGUOUSare sometimes false, which I think is slowing down something in PIL a lot. The copy is improving performance on the #2395 test by about 3x for me, on OS X ARM.