SwirlPreview      411 Magick++/lib/Magick++/Include.h   using MagickCore::SwirlPreview;
SwirlPreview     3217 magick/effect.c       case SwirlPreview:
SwirlPreview     1397 magick/option.c     { "Swirl", (ssize_t) SwirlPreview, MagickFalse },