applying marching squares algorithm on ttf fonts for glowing them at the contours(highlighting fonts )

hi, all the geeks out there

I am trying to set a glow around the fonts.

in my previous post I posted about glowing the sprites http://www.cocos2d-x.org/boards/6/topics/8670
I ended up adding another sprite.
but, fonts cannot be dealt with the same way.

I want to get the texture of fonts(if it has)to work upon it.

the only thing comes to my mind is applying marching squares algorithm.
http://devblog.phillipspiess.com/2010/02/23/better-know-an-algorithm-1-marching-squares/

any ideas or suggestions are welcome.

thanks
jeet