Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!husc6!purdue!decwrl!gilroy.pa.dec.com!joel
From: joel@gilroy.pa.dec.com (Joel McCormack)
Newsgroups: comp.windows.x
Subject: Re: DEC3100-Xlib performance
Message-ID: <1425@bacchus.dec.com>
Date: 18 May 89 21:29:19 GMT
References: <2675@helios.ee.lbl.gov> <8905181301.AA00183@expire.lcs.mit.edu> <1201@ttds.UUCP>
Sender: news@decwrl.dec.com
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The original release of the DECStation 3100 used the R3 code for arcs.  This code is slow.  The next release uses the code that Keith Packard has done for R4, which runs 2 to 8 times faster on circles, and about 50% faster on ellipses.

This is still slow.  In particular, I have convinced myself that 0-width arcs can run about a zillion times faster than they do now, using all integer arithmetic, and still get the right pixels set.  I'm pretty convinced that wide arcs can run a lo