[gtkmm] Packing a Gdk::Pixbuf into a Gtk::Box

[Hyrum Wright <hyrum_wright byu edu>]

I am attempting to put an image in the form of a Pixbuf into an HBox 
that lives on a Button.  The only problem is that all Pixbuf creation 
functions return RefPtr's, and the pack_start function on the box 
requires a pass by reference, not pointer of the item to be packed. 
Currently, I'm using the following code:

hbox = new Gtk::HBox();

Glib::RefPtr<Gdk::Pixbuf> pixbuf = Gdk::Pixbuf::create_subpixbuf 
(tmp_pixbuf, 0, 0, 17, 17);
tmp_pixbuf->scale (pixbuf, 0, 0, 17, 17, 0, 0, 0.6, 0.6, Gdk::INTERP_HYPER);
hbox->pack_start (pixbuf, false, false, 0);


When I attempt to compile the code, I get the following output from the 
compiler:

MyButton.cc: In constructor `MyButton::MyButton(int, const char*)':
MyButton.cc:52: error: no matching function for call to `Gtk::HBox::
   pack_start(Glib::RefPtr<Gdk::Pixbuf>&, bool, bool, int)'
/usr/include/gtkmm-2.0/gtkmm/box.h:302: error: candidates are: void
   Gtk::Box::pack_start(Gtk::Widget&, bool, bool, unsigned int)
/usr/include/gtkmm-2.0/gtkmm/box.h:303: error:                 void
   Gtk::Box::pack_start(Gtk::Widget&, Gtk::PackOptions, unsigned int)

Apparently, I can't back the RefPtr, and there is no way (that I can 
tell) to dereference it so that the pack_start function will accept it 
as input.

How do I work around this problem?

Many thanks,
Hyrum

--
High-Altitude Amateur Ballooning - http://icarus.byu.edu

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