Hqx(hq2x, hq3x, hq4x) magnification filter with javascript, ported by Emscripten
Demo: http://desti.ruree.net/hqx/
Original work: http://www.hiend3d.com/hq2x.html
C implementation of hqx: http://code.google.com/p/hqx/
Emscripten: https://github.com/kripken/emscripten