I guess an algorithm could be conceived that would somehow infer sub-pixel values, but this feels like it would be unnecessary faff, and very slow. Anyone know of a quick-and-dirty way of smoothing a bitmap? I guess I could render at a higher resolution than needed and scale down, to mimic calculating sub-pixels, but that also feels inefficient. There must be a clever cheaty way of doing this?
From what I know, rendering at a higher size then scaling is the only correct way; it's more or less what 3d cards do when rendering antialias on games.
All "antialiasing" techniques that take an image into account and try to create antialias out of thin air will just be different blurring techniques and will fail under certain specific situations. If you only have 'rounded' linear art as the example you linked to this might be feasible as you won't have to worry abour corners, so blurring + a few different threshold levels will create some nice antialias for you... but I personally think rendering at a higher size then scaling would be faster.
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