Oleg, I'm currently working on the AWTRenderer. The basic idea is to create a Java2DRenderer which provides the (abstract) technical foundation. Other renderers can subclass Java2DRenderer and provide the concrete output paths .
I think it would be a good idea to integrate your TIFFRenderer, as you propose in . Would you like to integrate it yourself? Otherwise I would like to do it. Regards, Renaud  http://wiki.apache.org/xmlgraphics-fop/FopAndJava2D  http://www.tkachenko.com/fop/fop.html