Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!natinst!brian
From: brian@natinst.com (Brian H. Powell)
Newsgroups: comp.windows.x
Subject: XDrawArc slow
Keywords: Sun, MacII, Where do I fix?
Message-ID: <4540@natinst.natinst.com>
Date: 19 Sep 89 18:12:40 GMT
Organization: National Instruments, Austin, TX
Lines: 27


     I've been doing a little experimental X programming using the book "X
Window Applications Programming" by Eric F. Johnson and Kevin Reichard.
     I did most of these tests on a 8-bit color Mac IIcx, running A/UX
1.1.1b3.  (X11R3.)  When I ran into the problem below, I tried it on a
monochrome Sun as well.  (generic (non-purdue) X11R3.)

     I came to the example about rubber-banding ovals.  Basically with a
pointer-moved event, you erase the old oval, and draw the new one, using
XDrawArc().
     It's too slow.  I thought it was bad on the Mac taking a second to draw
each arc (about 1.5 inches in diameter).  The sun took longer than that.

     I took a quick glance at the X11R3 source code, but couldn't really
figure out where the PolyArc drawing takes place.

     Question 1:  Why is it so slow?
     Question 2:  Can you give me a pointer to the code that does the actual
		  drawing?

     Please mail responses; I'll summarize if there's enough interest.  Thanks
in advance.

Brian H. Powell					National Instruments Corp.
	brian@natinst.com			12109 Technology Blvd.
	uunet!cs.utexas.edu!natinst!brian	Austin, Texas 78727-6204
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