Bulge Distortion Effect Help!

Hi,

I am developing some Text effects in AS3. I did complete curve text effect but are getting problem with bulge text.
Because bulge text distort each characters so i have to convert the text to bitmap format to distort. The problem is the quality is not good enough, especially when we resize the object.
I see in some websites they solved this issue and it works pretty good, like as bluecotton.com.

Do you have experience with that issue and can help?

Thanks so much