From o.finnendahl at inm.mh-freiburg.de  Wed Mar 21 12:29:00 2012
From: o.finnendahl at inm.mh-freiburg.de (Orm Finnendahl)
Date: Wed, 21 Mar 2012 13:29:00 +0100
Subject: [mcclim-devel] double buffering of drawing panes
Message-ID: <20120321122900.GB18925@varese>

Hi,

 in a mcclim application with incremental redisplay and lots of
objects there is a noticeable irregular flicker when dragging some
objects even for parts of the screen, which aren't invalidated by the
dragging. I checked the code and verified that my redraw routine is
not doing any redraw on these parts. It seems clim's work behind the
scenes replaying output records is responsible for that.

Is there a more or less straightforward way to implement double
buffering on the pane without taking mcclim apart?

Yours,
Orm



From csr21 at cantab.net  Wed Mar 21 13:37:00 2012
From: csr21 at cantab.net (Christophe Rhodes)
Date: Wed, 21 Mar 2012 13:37:00 +0000
Subject: [mcclim-devel] double buffering of drawing panes
In-Reply-To: <20120321122900.GB18925@varese> (Orm Finnendahl's message of
	"Wed, 21 Mar 2012 13:29:00 +0100")
References: <20120321122900.GB18925@varese>
Message-ID: <87haxi9itf.fsf@cantab.net>

Orm Finnendahl <o.finnendahl at inm.mh-freiburg.de> writes:

>  in a mcclim application with incremental redisplay and lots of
> objects there is a noticeable irregular flicker when dragging some
> objects even for parts of the screen, which aren't invalidated by the
> dragging. I checked the code and verified that my redraw routine is
> not doing any redraw on these parts. It seems clim's work behind the
> scenes replaying output records is responsible for that.
>
> Is there a more or less straightforward way to implement double
> buffering on the pane without taking mcclim apart?

Without checking too closely, there is a :double-buffering t initarg to
pane creation, which has in the past worked...

Cheers,

Christophe



From o.finnendahl at inm.mh-freiburg.de  Thu Mar 22 08:38:00 2012
From: o.finnendahl at inm.mh-freiburg.de (Orm Finnendahl)
Date: Thu, 22 Mar 2012 09:38:00 +0100
Subject: [mcclim-devel] double buffering of drawing panes
In-Reply-To: <87haxi9itf.fsf@cantab.net>
References: <20120321122900.GB18925@varese>
 <87haxi9itf.fsf@cantab.net>
Message-ID: <20120322083800.GA31510@varese>

Hi List,

Am Wednesday, den 21. March 2012 um 13:37:00 Uhr (+0000) schrieb
Christophe Rhodes:

> Without checking too closely, there is a :double-buffering t initarg
> to pane creation, which has in the past worked...

Cool, that works, thanks Christophe! The backend on my machine seems
buggy, however: When I click into the blank area or after releasing
mouse buttons the pane gets filled with a couple of scattered
rectangular excerpts from the rest of the xscreen. Moving the mouse
restores the screen to its correct appearance. Should I report that
somewhere or is there anything I could do about it (If it's the
backend: I'm by no means an expert on backends)?

Yours,
Orm