font usage

[beach ataman com]

Gtk Developers:

I read the docs/styles.txt file and I've still got some questions on
how to use styles and fonts.  Specifically, when is it okay to change
the contents of a GtkStyle?  Should I only change the attributes of a
copied style and then re-apply it?  What is the right way to change
the font for a particular style?  Is this correct?

gtk_font_unref(mystyle->font);
mystyle->font = new_font;
gtk_font_ref(mystyle->font);

Also, is it dangerous (or inefficent) to multiply load the same font?
(Or does Gdk take care of this?)

Thanks.

Dave