Request the windowing system to make window partially transparent,
with opacity 0 being fully transparent and 1 fully opaque. (Values
of the opacity parameter are clamped to the [0,1] range.)
On X11, this works only on X screens with a compositing manager
running.
For setting up per-pixel alpha, see gdk_screen_get_rgba_colormap().
For making non-toplevel windows translucent, see
gdk_window_set_composited().
Since 2.12
Request the windowing system to make window partially transparent, with opacity 0 being fully transparent and 1 fully opaque. (Values of the opacity parameter are clamped to the [0,1] range.) On X11, this works only on X screens with a compositing manager running. For setting up per-pixel alpha, see gdk_screen_get_rgba_colormap(). For making non-toplevel windows translucent, see gdk_window_set_composited(). Since 2.12