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bb8c8a67dc
The initial signs were wrong for the deltas of f(x), the ellipse equation. This seemed to be fine for larger circles/ellipses but broke things at a small scale, this was previously fixed with a horrible "error = error / 4" hack. With this change, all ellipses look a little better :^) This also fixed a signed integer overflow Andreas found with UBSAN, which happened for circles with a 1px radius.