bicubic interpolation

would it be possible to enable something like interpolation for digital zooming >100%? only if it goes without major speed penalty obviously, but i think it's not too bad.

http://stackoverflow.com/questions/2517641/how-to-draw-and-scale-a-bitmap-on-a-canvas-using-bicubic-interpolation-in-android

on a related note: maybe zooming >100% should allow for arbitrary factors, not limit to 120,140,etc.

it's a bit confusing when you do twofinger-zoom to a random level and oruxmaps then changes the view to some predefined step.