i need to create GTK GUI with image and transparent label (darker) that is placed over the image. The first problem is overlapping. I tried Gtk::Table and Gtk::Fixed container but it behaves strangely. The second problem is transparency. I would like to use CSS styles or transparent background image. Is there anybody who can help me posting some sources or examples? Thanks
You could subclass GtkWidget, or GtkDrawingArea since I think it will be faster than the altenatives. But you could use GtkOverlay, plus GtkImage and GtkLabel to acomplish what you're looking for. gtk3-demo app that comes with Gtk+-3.0 give some examples of how to use GtkOverlay.
Maybe you could give a look to clutter-gtk ? You can do nice things with it.