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


unsigned far JD_imagesize(int left, int top, int right, int bottom) {

   unsigned long X_width, Y_width;

   X_width= ( (left > right) ? (left - right + 1) : (right - left + 1)  );
   Y_width= ( (  up >  down) ? (  up -  down + 1) : ( down -   up + 1)  );

   return (X_width * Y_width + 4);

};