GdkVisual* gdk_screen_get_rgba_visual ( GdkScreen* screen )
Gets a visual to use for creating windows 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 gdk_window_set_opacity().
Available since: 2.8
A visual to use for windows
with an alpha channel or
NULL if the capability is not available.
|The data is owned by the instance.|
|The return value can be |