GD and unicode problems:broken text

well,i am developing a site for a client which uses indian language.
We are trying to convert unicode text to image using ImageTTFText

Every things works fine and image is also created with the unicode text except the half words the unicode has ,is not rendered correctly.
Rather then half words excat words as it is typed appears in image that is created.
It seems like bug.
I am using a unicode font to generate the image.
Seems like somebody has file a bug for problem excat to mine here

but no solution
any one?
it happens in php pdf generation as well

any help