[gtkada] Example using Gdk.RGB.Draw_Gray_Image?

[Jacob Sparre Andersen]

Does anybody have an example of how to use
Gdk.RGB.Draw_Gray_Image?  I most certainly don't want to
allocate an object of type Gdk.RGB.RGB_Buffer (it is too
large for my laptop).  How can I convert a smaller array of
Glib.Guchar to Gdk.RGB.RGB_Buffer in the intended way?

Greetings,

Jacob
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