From: Claude Marche <Claude.Marche at lri.fr>
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Message-ID: <16138.54573.314788.280376 at mailhost.lri.fr>
Date: Tue, 8 Jul 2003 16:29:01 +0200
To: stalkern2 at tin.it
Cc: lablgtk at kaba.or.jp
Subject: Re: animation: pixmap transparency?
In-Reply-To: <200307081555.38754.stalkern2 at tin.it>
References: <200307021756.22997.stalkern2 at tin.it>
	<20030708093841E.garrigue@kurims.kyoto-u.ac.jp>
	<200307080926.20760.stalkern2@tin.it>
	<200307081555.38754.stalkern2@tin.it>
Sender: Claude Marche <Claude.Marche at lri.fr>


>>>>> "Stalkern" == Stalkern 2 <stalkern2@tin.it> writes:

    Stalkern> Il  Tuesday 08 July 2003 09:26, Stalkern 2 ha scritto:
    >> OK, I've been merging this by a previous code sample from Claude Marché and
    >> now I get transparency: but it seems that setting the clip mask fools the
    >> callback that restores the background.
    >> So, before having transparency I had a background that could recover from
    >> exposure, now it can not.
    >> Another buggy feature is that I have to hide the footprints of the moving
    >> pixmap by hand.
    >> 
    >> To test this code, one can download the images bkg.xpm and fly.xpm from
    >> http://www.connettivo.net/cntdownload/XPMs/
    >> 
    >> Any commentary, suggestion, hint is welcome.
    >> Thank you
    >> Ernesto

    Stalkern> I've been using lines for putting into evidence the exposed area (I just 
    Stalkern> outline a crossed box over the exposed area caught by my background-restoring 
    Stalkern> callback). 
    Stalkern> Again, the use of a mask seems to forbid redrawing of areas external to the 
    Stalkern> clipped image. 

Hi Ernesto,

I think you should deactivate the clip mask before drawing your
background. May be such a possibility is missing in lablgtk: directly
in C, one may call Gdk_GC::set_clip_mask without argument to unset the
clip mask, but I see no way to call it without argument from lablgtk. 

lablgtk maintainers, in ideas ?

- claude

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