NAME
	InitTmpRas -- Initialize area of local memory for usage by
			areafill, floodfill, text.

   SYNOPSIS
   	InitTmpRas(tmpras, buffer, size)
              	    a0	     a1     d0

	void InitTmpRas( struct TmpRas *, void *, ULONG );

   FUNCTION
	The area of memory pointed to by buffer is set up to be used
	by RastPort routines that may need to get some memory for
	intermediate operations in preparation to putting the graphics
	into the final BitMap.
	Tmpras is used to control the usage of buffer.

   INPUTS
	tmpras - pointer to a TmpRas structure to be linked into
		a RastPort
	buffer - pointer to a contiguous piece of chip memory.
	size - size in bytes of buffer

   RESULT
	makes buffer available for users of RastPort

   BUGS
	Would be nice if RastPorts could share one TmpRas.

   SEE ALSO
	AreaEnd() Flood() Text() graphics/rastport.h