World: r3wp

I got 'yes' from the AGG author to be able use v2.4 but there is 
not much significant changes in 2.3 vs 2.4 except internal code cleanup 
and few new custom rasterizers so the priority for going to 2.4 was 
never high enough to spend time on it.

The AGG in R3 uses some code from 2.4 as it was much easier to add 
it this way than merge all the custom changes to 2.4 and then do 
all the testing to see if something went wrong.


Ofcourse any effeort to make the proper transition from the current 
2.3 based code to v2.4 is welcome.

Is there any graphics related test framework?

AFAIK There is no real test framework for R3. Only the DRAW and SHAPE 
tests included in host-kit.