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From: jdn@europa.Eng.Sun.COM (Jeff Nisewanger)
Newsgroups: comp.lang.postscript
Subject: Re: Level 2 vs. Display PostScript?
Message-ID: <143963@sun.Eng.Sun.COM>
Date: 19 Oct 90 21:59:31 GMT
References: <20.UUL1.3#5127@aladdin.com>
Sender: news@sun.Eng.Sun.COM
Organization: Sun Microsystems, Mt. View, Ca.
Lines: 39

In article <20.UUL1.3#5127@aladdin.com> ghost@aladdin.com (L. Peter Deutsch) writes:
>I've been following the discussion about Level 2 PostScript here, but
>I don't remember seeing any mention of the relationship between Level
>2 and Display PostScript.  Does anyone have any firm information
>about whether all of the features of Display PostScript are included
>in Level 2?  Some of the stuff in Display PostScript, like the new
>memory manager, the hit detection operators, view clipping, and the
>multi-process facilities, seems quite specific to display
>environments; other stuff, like the new encoding formats, the support
>for rectangles, the user path machinery, and the new halftoning
>mechanisms, seems to be environment-independent.
>
>Any non-confidential but well informed reponses would be greatly
>appreciated.  (Yes, I know the answers will be in the new Red Book,
>but Real Soon Now doesn't seem to have arrived yet. :-))  Thanks -
>
>L. Peter Deutsch :: Aladdin Enterprises :: P.O. box 60264, Palo Alto, CA 94306
>ghost@aladdin.com | {uunet,sun,decwrl}!parcplace!aladdin!ghost | (415)329-0264
>	    "Implementation is the sincerest form of flattery."


	I haven't done a line-by-line comparison but it's a generally safe
statement that everything in Display PostScript will be in the printer
version of PostScript Level 2 except for things relating to multiple
processes the associated syncronization facilities and the operators
listed in Display PostScript as window-oriented operators like the view
clipping.

	The "insideness" operators and the garbage collector *are*
part of the printer version of PSL 2 as far as I can tell. This info
is based on the incomplete draft handouts on PSL 2 from the
Adobe Developer's Conference.



--
Jeff Nisewanger                         ARPA: jdn@Eng.Sun.COM
Window Systems Group                    UUCP: ...!sun!jdn
Sun Microsystems, Inc.                  415/336-5743