CLIM mail archive
Incremental Redisplay Performance
Date: Tue, 3 Mar 1992 08:33 PST
From: Scott McKay <SWM@SAPSUCKER.SCRC.Symbolics.COM>
Date: Mon, 2 Mar 1992 21:33 EST
From: will taylor <email@example.com>
A typical redisplay using this technique takes less than a second, while the default
redisplay took about 8 seconds (for a 50 node graph).
This experience reinforces my hope that CLIM 2.0's implementation and documentation
will place more emphasis on incremental redisplay performance -- with the default
redisplay functionality my UI was just about unusable. With my modificaitons the
UI demonstrates the advertised claims of CLIM.
***New message. I made a mistake in the code I supplied. Sorry.***
This reply is just meant to provide a few more bits of information.
Please don't think that I am in any way trying to defend the terrible
performance of CLIM's incremental redisplay.
Here is a kludgy patch that implements it. I have not tested this in
CLIM 1.0, just in CLIM 1.1. Use :INCREMENTAL-REDISPLAY '(T :CHECK-OVERLAPPING NIL)
in your pane.
Thanks for your detailed response -- I hope that it will be typical of the future
documentation of CLIM's incremental redisplay.
Will CLIM 1.1 correct the extreme slowness of changing layouts in CLIM 1.0? I went
to my own redisplay in that case as well, by creating multiple windows using
(defmethod MAKE-OVERLAY-WINDOW-STREAM ((frame APPLICATION-FRAME) &key pane-to-overlay
default-text-style window-class (scroll-bars :both)
"return window stream located over pane-to-overlay -- not in frame layout"
(let* ((parent (frame-top-level-window frame))
(input-buffer (stream-input-buffer parent)))
(multiple-value-bind (left top right bottom)
(open-window-stream :parent parent
:left left :top top :right right :bottom bottom
which occupy the same frame coordinates and then using (window-expose pane) to
expose the pane which belonged to the currently selected layout. Apparently there is
a (REDISPLAY-FRAME-PANE frame pane :force-p t) done on each pane on a newly selected
layout whether or not the pane is common to the previous layout and whether or not
the pane has changed.
When is CLIM 1.1 to be expected?
==> Will Taylor
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