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List:       freedesktop-xorg
Subject:    Re: Reasons for FreePicture to cause "RenderBadPicture"?
From:       Glynn Clements <glynn () gclements ! plus ! com>
Date:       2010-08-30 8:37:15
Message-ID: 19579.28091.537346.520763 () cerise ! gclements ! plus ! com
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Clemens Eisserer wrote:

> > Pixmaps are reference-counted and the picture takes a reference on the
> > pixmap, so the pixmap can't go away before the picture.
> >
> > However this isn't true for windows, so as soon as the window is
> > destroyed presumably the picture is destroyed as well or becomes
> > invalid.
> 
> Can this be considered as bug?  I just tried the same for GCs and
> XFreeGC doesn't generate any error when the Window has already been
> destroyed.
> Sure there is an implementation detail behind it, but GCs don't show
> the same behavour and the whole thing somehow feels quite inconsistent
> :(

GCs aren't associated with a window. The drawable passed to XCreateGC
is used to specify the screen and depth, but has no significance
beyond that. A GC may be used with any drawable having the correct
screen and depth.

-- 
Glynn Clements <glynn@gclements.plus.com>
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