I highly suspect the fill rate gains you get from using DirectComposition/Core Animation for scrolling/zooming *static* vector graphics in 2D completely outweigh any gains from any fancy GPU vector rendering algorithm you could come up with in practice.
Note that bilinear/trilinear filtering does not mean things turn blurry as you zoom. That's just a poor implementation. Rather it means you interpolate between power of two zoom levels.
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Interesting! Thanks!
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