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From: kelley@open.dal.ca (Dan Kelley)
Newsgroups: comp.windows.open-look
Subject: GUIDE -- how to remove excessive initial repaint requests?
Keywords: Guide repaint performance
Message-ID: <1991May21.140135.26869@cs.dal.ca>
Date: 21 May 91 14:01:35 GMT
Sender: news@cs.dal.ca (USENET News)
Organization: Oceanography, Dalhousie University, Halifax, NS, Canada
Lines: 35
Originator: kelley@open.dal.ca
Nntp-Posting-Host: open.dal.ca

I've used Guide and Gxv to create an xview interface.  These are great
programs: a few hours of tinkering gave me a functional interface.
However, I'm reluctant to do the next step -- adding my own code to
the Guide-generated callback functions -- because the application
starts out by calling my repaint function SIX times!  My application
is pretty slow, even if no actual drawing is taking place, so this
will totally kill performance.

I'm not an X expert (that's why I'm using Guide, after all), so I
wonder whether anybody out there can suggest a way around this
performance killer.  For example, is there some kind of countdown flag
I can monitor, so I can do the repaint only the last time it's
requested?

Below I've pasted the code that Guide wrote for me:

  /*
   * Repaint callback function for `canvas1'.
   */
  void
  repaint_gri(canvas, paint_window, display, xid, rects)
	  Canvas          canvas;
	  Xv_window       paint_window;
	  Display         *display;
	  Window          xid;
	  Xv_xrectlist    *rects;
  {
	  fputs("grixv: repaint_gri\n", stderr);
  }


-- 
Dan Kelley, Oceanography Department   |  kelley@cs.dal.ca
Dalhousie University                  |  {uunet watmath}!dalcs!kelley
Halifax, Nova Scotia, CANADA, B3H 4J1 |  (902) 494-1694