Re: Semi-transparent GdkWindows?

[Christian Neumair <chris gnome-de org>]

Am Sonntag, den 11.09.2005, 10:26 +0200 schrieb Christian Neumair:
> I'm currently trying to implement a semi-transparent drag window for
> Nautilus. I'm trying to do this by creating a window widget and
> connecting to its "expose-event", and then drawing onto it this handler.
> Unfortunately, gdk_window_shape_combine_mask takes a bilevel alpha mask,
> i.e. full alpha vs. no alpha, probably since the X extension it uses
> just sets the window shape, so all I can do is draw a offscreen drawable
> on the windows and set its bilevel alpha mask.
>
> I played around with cairo, but it also seems to draw onto the window
> and there doesn't seem to be any way to do something like
> gdk_window_fill (0x00000000).
>
> So my sad and hopefully wrong conclusion is that GdkWindows and the
> underlying Windows don't seem to have a full alpha channel. Can cairo
> help me here? Do we need a new, more powerful, X extension?
>
> Thanks for your replies in advance!

Sorry for molesting you. I was just tired and a bit frustrated because I
spent a whole night on the issue. Turns out that probably GTK+/GDK API
isn't powerful enough and I have to use Xrender.

-- 
Christian Neumair <chris gnome-de org>