Path: utzoo!attcan!uunet!snorkelwacker!bloom-beacon!SABER.COM!jimf
From: jimf@SABER.COM
Newsgroups: comp.windows.x
Subject: Re: XPutImage() vs XDrawPoints() performance
Message-ID: <9007171343.AA04691@lance>
Date: 17 Jul 90 13:43:27 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 20

|If you have more than 30000 points to draw, XGet/PutImage() along with 
|  XGet/PutPixel() is much better becuase you muck around with the 
|  actual data locally and you blast the finished image over to the 
|  server when you are done.

A better rule-of-thumb might be that if you have more points than you
can send in a single XDrawPoints command (circa 16000 for the stock R4
server I believe -- it was double that for R3 if I remember right),
consider some other way.  It doesn't take too many points to cause the
per-point overhead to exceed what an image would use, so even this
isn't too accurate.

|Does having a huge image cause XGet/PutImage() to slow down 
|  significantly so that XDrawPoints() becomes an attractive 
|  alternative?

Not unless it's a very *small* image in which case it doesn't really
matter which way you go.

jim