Widget\application screenshot

Hi, I’m using gtkmm4, I need to create a screenshot of the main widget, which inherit Gtk::ApplicationWidget.
I’m afraid this gtk3 code is using deprecated API:

GdkPixbuf * get_screenshot(){
    GdkPixbuf *screenshot;
    GdkWindow *root_window;
    gint x_orig, y_orig;
    gint width, height;
    root_window = gdk_get_default_root_window ();
    gdk_drawable_get_size (root_window, &width, &height);      
    gdk_window_get_origin (root_window, &x_orig, &y_orig);

    screenshot = gdk_pixbuf_get_from_drawable (NULL, root_window, NULL,
                                           x_orig, y_orig, 0, 0, width, height);
    return screenshot;

What would be the best way to do it in gtkmm4?

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