You can force it manually by setting shouldRasterize on a common superlayer (add corner rounding to that one).
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I was being stupid. cornerRadius + masksToBounds on a superlayer will be enough and will process fewer pixels.
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ah yes I always forget about the fast path for that case! wish these things were documented.
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only a fast path in a sense of fewer pixels get processed, but it still requires an offscreen pass...
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Replying to
oh but maybe that’s what you meant by fewer pixels! still offscreen, requires flushing etc, yes of course
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Exactly! But things improved over time e.g. in iOS 9 bounds-sized contents + corners no longer goes offscreen.
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