QuadraticFilter    94 Magick++/demo/zoom.cpp               filter=QuadraticFilter;
QuadraticFilter   294 Magick++/lib/Magick++/Include.h   using MagickCore::QuadraticFilter;
QuadraticFilter   976 magick/option.c     { "Quadratic", (ssize_t) QuadraticFilter, MagickFalse },
QuadraticFilter   709 magick/resize.c     { QuadraticFilter,    BoxFilter      }, /* Quadratic Gaussian approx    */