Am Sonntag, den 11.09.2005, 10:41 +0200 schrieb Christian Neumair: > 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.
I wanted to do this using cairo, but I failed. I have a GdkPixbuf containing alpha information. My cairo context is created for my GdkWindow on "expose-event". When painting with cairo_paint_with_alpha, I still don't get transparency effects for the containing Window. I suppose that I'm just painting on top of the Window instead of painting the Window itself. Do I need a compositing manager and the compositing extension [1] that this works? There seem to be internal cairo functions which could be useful, like _cairo_surface_composite. Help appreciated! [1] http://freedesktop.org/wiki/Software_2fCompositeExt -- Christian Neumair <[EMAIL PROTECTED]>
_______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
