// (If both images are the same aspect and the top image has alpha=1.0
// for all pixels, you will not see anything of the one on the bottom.)
//
-// This is the “atop” operation from Porter-Duff blending, also used
+// This is the “over” operation from Porter-Duff blending, also used
// when merging layers in e.g. GIMP or Photoshop.
//
// The first input is the bottom, and the second is the top.