Shaped windows in gtkmm

How do I create shaped windows in Gtkmm. The shape must be defined using ca开发者_运维知识库iromm.

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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