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List:       kde-devel
Subject:    Re: KDesktop 3 transparency patch
From:       Lubos Lunak <l.lunak () suse ! cz>
Date:       2007-06-06 20:45:48
Message-ID: 200706062245.48557.l.lunak () suse ! cz
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On st 6. června 2007, Dennis Kasprzyk wrote:
> The first one allows you to change the opacity of the background image.
> This works currently with the beryl transparent cube and will also work
> with compiz once the transparent cube gets applied. To activate the feature
> add the following to your kdesktoprc:
> [Background Common]
> BackgroundOpacity=90 (0 = fully transparent / 100 = opaque)

 What is the reason for modifying KDesktop (and Nautilus and whatnot) to use 
the ARGB visual instead of simply using _NET_WM_WINDOW_OPACITY or even better 
just adjusting the opacity in the compositing manager and not having to 
modify the desktop apps at all?

> The second feature allows compiz (and later maybe other composite managers)
> to tell kdesktop not to paint the background image
> ("_COMPIZ_WALLPAPER_SUPPORTED" x atom). In this case compiz is able to
> paint a viewport dependent background or to make it even animated. This
> feature looks for changes to the x atom, so that kdesktop will
> automatically switch back to normal background if kwin gets started or
> compiz stops to render the wallpaper.

 Is this _COMPIZ_WALLPAPER_SUPPORTED written down somewhere? I don't see it 
anywhere in Compiz sources, and, if what's said about David Reveman's 
strictness is true, I probably won't. That's a rather ugly way to announce a 
feature support, it should be rather something like _NET_WM_SUPPORTED for 
CMs. Since we have library code for handling things like this that'd also 
avoid the need to write specific X code for it potentionally including broken 
things like "XSelectInput (qt_xdisplay(), qt_xrootwin(), 
PropertyChangeMask);" .

-- 
Lubos Lunak
KDE developer
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SUSE LINUX, s.r.o.   e-mail: l.lunak@suse.cz , l.lunak@kde.org
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