The Current Prime in Terms of Performance

In your current prototype implementation, could you be dragging an image around and recomputing this and still get a real frame rate? You can. The current prime in terms of performance is surprisingly the laying out the text itself. We have something called line breaker, for instance, where you give it a width and a chunk of text and it tells you, okay, you can. Here's the offset in the source text where you have to stop to make that line fit. And they've been incredibly helpful.