These are sampling artifacts, but I believe yorbwa is correct in distinguishing these from conflation artifacts, as defined in Kilgard & Bolz. I think of the latter as compositing not commuting exactly with antialiasing (sampling). You only get conflation artifacts when compositing multiple shapes (or rendering a single shape using analytical area when the winding number is not everywhere 0 or 1), while you definitely see aliasing when rendering a single shape, say a Siemens star.
Okay, that’s fair. I’m misusing the term ‘conflation’ in that sense. I was trying to make the point that compositing two wrong answers yields a wrong answer, but I stand corrected that it’s not the compositing that’s introducing error, it is the sampling + box-filtering.
