[raphlinus]

I don't see how you can support the claim of perfect thin line rendering, it's visibly just not very good. So box filtering logically can't possibly be the best possible quality.

Can we make a magical adaptive filter which resembles box filter for half-planes, a tent filter for thin lines, Mitchell-Netravali or oblique projection for natural images, and Gaussian when filtering images for which high frequency detail is not important? Perhaps, but that feels like advanced research, and also computationally expensive. I don't think you can claim "perfect" without backing it up with human factors data really demonstrating that the filtered images are optimum with respect to perceived quality.

[nyanpasu64]

I wonder if the ideas behind GIMP's new nonlinear resampling filters (NoHalo and LoHalo, and eventually more https://graphicdesign.stackexchange.com/q/138059) may translate to vector rasterization in some form (though here we're translating continuous to discrete, not discrete to continuous to a differently spaced discrete).