MagickXGetScreenDensity  594 magick/command.c     image_info->density=MagickXGetScreenDensity(display);
MagickXGetScreenDensity 6237 magick/command.c     image_info->density=MagickXGetScreenDensity(display);
MagickXGetScreenDensity  522 magick/xwindow.h   *MagickXGetScreenDensity(Display *);