Gets a colormap to use for creating windows or pixmaps with an
alpha channel. The windowing system on which GTK+ is running
may not support this capability, in which case
be returned. Even if a non-
NULL value is returned, its
possible that the window's alpha channel won't be honored
when displaying the window on the screen: in particular, for
X an appropriate windowing manager and compositing manager
must be running to provide appropriate display.
This functionality is not implemented in the Windows backend.
For setting an overall opacity for a top-level window, see
GdkColormap] a colormap to use for windows with
an alpha channel or
NULL if the capability is not available. [ transfer none ]
Derived by RGtkGen from GTK+ documentation
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