Question
How do I create shaped windows in Gtkmm. The shape must be defined using cairomm.
Solution
Cairo and GTK+ are not directly relevant with shaped windows.
You need to look at GDK which is the windowing system for GTK+
Here is the respective method in vanilla (for C) GDK
http://library.gnome.org/devel/gtk/stable/GtkWidget.html#gtk-widget-shape-combine-mask
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