NAME
	ScrollVPort -- Reinterpret  RasInfo information in  ViewPort to reflect
			the current Offset values.

   SYNOPSIS
	ScrollVPort( vp )
		     a0

	void ScrollVPort(struct  ViewPort *vp);

   FUNCTION
	After the programmer has adjusted the Offset values in
	the  RasInfo structures of  ViewPort, change the
	the copper lists to reflect the the Scroll positions.
	Changing the  BitMap ptr in  RasInfo and not changing the
	the Offsets will effect a double buffering affect.

   INPUTS
       vp - pointer to a  ViewPort structure
	     that is currently be displayed.
   RESULTS
	modifies hardware and intermediate copperlists to reflect
	new  RasInfo

   BUGS
       pokes not fast enough to avoid some visible hashing of display (V37)
	This function was re-written in V39 and is ~10 times faster than
	before.

   SEE ALSO
	 MakeVPort()  MrgCop()  LoadView()   sc:include/graphics/view.h