Basic idea is to use "A intersect B" to get convex corners and "not(C intersect D)" to get concave; that guy simplified to median(A,B,C).
Point being you have to essentially rasterize the glyph first to generate an SDF.
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Yes, if you're only going to use the SDF once before turning it into a bitmap, there's no point in using SDF.
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If you're going to do it more than once, then you can pay that cost once and leverage it in faster rerendering at other scales/subpixel pos.
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