For testing-purposes I've created pre-built jre packages for x86 available at:
To try it, simply pass -Dsun.java2d.xrender=True to java, e.g.
> bin/java -Dsun.java2d.xrender=True -jar demo/jfc/Java2D/Java2Demo.jar
Those OpenJDK based builds contain the latest xrender sources, as well as the Jules rasterizer.
I'll try to keep those builds in sync with jdk7 master as far as possible.
Have a lot of fun :)