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 imagesize()             Get Amount of Mem Needed to Store Screen Image

 #include   <graphics.h>

 unsigned far imagesize(left,top,right,bottom);
 int          left;
 int          top;
 int          right;
 int          bottom;

    imagesize() is used to determine the amount of memory necessary to
    store a portion of the screen, specified by the coordinates
    ('left','top'), ('right','bottom'). The value returned by imagesize()
    should be used to allocate memory for storage. getimage() is used to
    save the screen portion and putimage() is used to return it to the
    screen.

    Returns:    The number of bytes necessary to store the specified
                screen image.  -1 is returned if the image is greater
                than or equal to 64K bytes.

   -------------------------------- Example ---------------------------------

    The following statements create a rectangular area on the screen
    which is to be saved. The amount of memory needed to save it is
    determined and space is allocated for it.  The area is saved, then
    cleared and a message is written where the rectangle existed.  The
    original rectangle is then restored. The area in memory is then
    deallocated.

           #include <graphics.h>

           int gdriver = DETECT;
           int gmode;

           main()
           {
               void *pict;
               unsigned p_size;
               int l = 100, t = 100, r = 300, b = 300;

               initgraph(&gdriver,&gmode,"");
               setfillstyle(HATCH_FILL,RED);
               rectangle(l,t,r,b);
               floodfill(l+10,t+10,WHITE);
               outtextxy(l+50,t+100,"ORIGINAL SCREEN");
               getch();
               p_size = imagesize(l,t,r,b);
               pict = malloc(p_size);
               getimage(l,t,r,b,pict);
               cleardevice();
               rectangle(l,t,r,b);
               outtextxy(l+50,t+100,"SCREEN SAVED,");
               outtextxy(l+50,t+110,"THEN CLEARED");
               getch();
               putimage(l,t,pict,COPY_PUT);
               outtextxy(l+50,t+110," (RESTORED)");
               getch();
               free(pict);
               closegraph();
           }