Hi
In my previous posting i had run off in a bad direction...
After lots of googling and RTFM i found a solution that seems to work for me:
Use the Cairo Context of a DrawingArea (by means of he on_draw() callback)
to first draw the background and then use
Gdk::Cairo::set_source_pixbuf()
to draw the pixbuf containing the image with transparency into the context.
(basically i combined the two examples of the Gnome book "programming
with gtkmm3":
"Drawing Area - Lines" and "Drawing Area - Image")
bool MyArea::on_draw(const Cairo::RefPtr<Cairo::Context>& cr) {
Gtk::Allocation allocation = get_allocation();
const int width = allocation.get_width();
const int height = allocation.get_height();
cr->save();
cr->scale(width, height);
cr->set_line_width(0.05);
// do some cairo drawing for the background
// this may also involve drawing an image to the cntext
// ...
cr->restore();
// draw the image to the context
Gdk::Cairo::set_source_pixbuf(cr, m_image,
(width - m_image->get_width())/2,
(height - m_image->get_height())/2);
cr->paint();
return true;
}
Sorry for my unnecessary cry for help
Jody
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