Abstract some GdkWindow API into an interface that the backends must

Abstract some GdkWindow API into an interface that the backends must

2008-06-27  Emmanuele Bassi  <ebassi@gnome.org>

	Abstract some GdkWindow API into an interface that the backends
	must implement. (based on a patch by Alex Larsson)

	* gdk/Makefile.am: Add gdkwindowimpl.[ch]

	* gdk/gdk.symbols: Move symbols around.

	* gdk/gdkinternals.h:
	* gdk/gdkwindowimpl.[ch]: Move some of the GdkWindow API we require
	from the backends to a GInterface that the backends should implement
	instead.

	* gdk/gdkwindow.c: Provide some of the GdkWindow public API as a
	wrapper call around the GdkWindowImpl interface vtable.

	* gdk/x11/gdkevents-x11.c:
	* gdk/x11/gdkgeometry-x11.c:
	* gdk/x11/gdkprivate-x11.h:
	* gdk/x11/gdkwindow-x11.c:
	* gdk/x11/gdkwindow-x11.h: Update the X11 backend to implement
	the GdkWindowImpl interface.

svn path=/trunk/; revision=20695