AGG only, but from the notes on the Cairo version, that is already hopelessly outdated with respect to the MarkersSymbolizer support.
References issue #771.
add ignore-placement to MarkersSymbolizer
great work. Only suggestion would be to add the property to save_map.cpp and the python bindings as well. If you run into trouble at all, np, I can do this after merging, just let me know.
+add MarkersSymbolizer ignore-placement to save_map and python bindings