Because gtk-directfb was removed in master and directfb was introduced, we need a new app to test this. The old one was gtk-demo for gtk-directfb. See bug 3642 for more details.
I think directfb-examples is what you want. It provides "Test and demonstration applications". I am working on updating it to lastest version 1.7.0
directfb-examples is in and with latest version 1.7.0. I mark this defect RESOLVED.
The examples are implemented and work. Setting to VERIFIED.