Hello, I'm a newcomer and I'm looking for a chance to see the source :)

[Aredo]

Sure, first idea is using of anisotropic filtering. But not sure yet if jpcsp will benefit from it. Second idea is implementing of magnification algorithms from the series of hq (hq2x...). They are already used in many emulators and seem to improve quality of 2D.
Reference link: http://web.archive.org/web/2008022204253.../hq2x.html