NAME   
 	SetDrMd -- Set drawing mode for a RastPort

   SYNOPSIS
	SetDrMd( rp, mode )
		 a1  d0:8

	void SetDrMd( struct RastPort *, UBYTE );

   FUNCTION
	Set the drawing mode for lines, fills and text.
	Get the bit definitions from rastport.h

   INPUTS
	rp - pointer to RastPort structure.
	mode - 0-255, some combinations may not make much sense.

   RESULT
	The mode set is dependent on the bits selected.
	Changes minterms to reflect new drawing mode.
	Sets line drawer to restart pattern.

   BUGS

   SEE ALSO
	SetAPen() SetBPen() graphics/rastport.h