Comment by WithinReason

Triangles are the wrong choice, but otherwise you make a good point. This guy uses an atlas because he renders fonts by super sampling bezier curves using up to 512 samples per pixel, which is very expensive. However, you could e.g. compute the integral of the intersection of the bezier curve area with the subpixel area much faster, which I think could run in real time without a need for an atlas and would be more accurate than supersampling.