transparent background on DrawingArea

[michi-10]

Hello everybody,

I am trying to draw something using Cairo to a DrawingArea and set the
blank pixels to "transparent" using shape_combine_mask.
With this i want to create a window on desktop-level showing some
information. To use shape_combine_mask i must create a Gdk::Bitmap from
the Drawable. Is there a good solution for this?

Regards,

Michael
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