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by andymatuschak
4992 days ago
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Many of these are places where people are caching rasterizations of deep layer hierarchies to avoid paying the compositing cost on a per-frame basis. But if you do that with drawRect:, you're using the CPU (not the GPU); if you use your own images, you're on the hook for your own caching, which you're likely to mess up. Such cases should probably use -[CALayer setShouldRasterize:] instead. For more about this stuff, check out the two WWDC sessions I mentioned above. |
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