KDesktop transparency support 0.1

KDesktop transparency support is a KDE patch that adds support for real transparency to kdesktop. It adds two new composite manager related features. To activate the features kdesktop has to be started with the "--bg-transparency" option.

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)

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.

This patch is against the current kde3 svn.