[cairo] New ruby cairo binding landed in CVS

[mental at rydia.net]

Quoting Ned Konz <ned at squeakland.org>:

> Why not take a block for the path?
>
> See the attached.

I'm not sure I understand the utility of stroked_path and
closed_path, nor of passing parameters to the block (blocks are
closures after all, you can use local variables tranparently)...

save_during looks like a very good idea though, although I have
mixed feelings about the name.

May I recommend something like:

 def restore_after
   save
   begin
     yield
   finally
     restore
   end
 end

That way, we don't leave the context in an unknown state if an
exception is thrown from within the block.

-mental