The Decoration plugin provides a window border for your windows. The decoration plugin is essentially useless without a window decorator, and you need one running so that the decoration plugin can render the window border.
Storage of Settings
It is important to note that the following settings are mainly used not by the decoration plugin, but by the included Compiz-Core decorators, GTK Window Decorator and KDE Window Decorator. The settings are read by GTK window decorator in the GConf key /apps/compiz/plugins/decoration/allscreens. In order for these settings to take effect with the GTK window decorator, you need to change your CompizConfig backend to GConf. The settings are also obtained by KDE Window Decorator via DBUS through Compiz.
- Shadow Radius : How large the shadow is
- Shadow Opacity : How transparent the shadow is
- Shadow Color : What color the shadow is
- Shadow Offset X : How much further in the X direction the shadow is projected
- Shadow Offset Y : How much further in the Y direction the shadow is projected
Finally, you can choose for Compiz to launch a decorator by putting a string containing the command for the decorator in the 'Command' box.
You can also choose a window match for which windows the Decoration Plugin decorates and paints shadows on. For more info on how to write a match, see WindowMatching
So far, there are 3 different decorators that you may use with the decoration plugin.