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                                 fg_blit

   Usage
   #include <fg.h>
   void far fg_blit(fg_const_pbox_t src_box, fg_coord_t x, fg_coord_t y,
   int dstpage, int srcpage);

   Description
   Do  a 'blit' of a rectangle of pixels from one area of the  screen  to
   another. The argument arc_box defines the source rectangle of  pixels.
   Box src_box must be enclosed by fg.displaybox both before the start of
   the  blit  and  after  the translation to  the  new  coordinates.  The
   arguments x and y give the coordinates of the lower left corner of the
   destination of the box src_box. The page the pixels are to be moved to
   is given by dstpage and the page they are to be read from by srcpage.

   No clipping is done. Overlapping source and destination locations will
   be  handled  such  that the pixel to be read is  not  destroyed  by  a
   previous  write.  This  function can also be used  as  a  "page  copy"
   function  with  the  proper  src_box(fg.displaybox)  and   destination
   coordinate(0,0).

   Example
   /* copy screen from oldpage to page */
   fg_blit(fg.displaybox, 0, 0, page, oldpage);