[luatex] Accessing the PDF page stream right before page gets written to the PDF file?

[Patrick Gundlach]

Hello all,

is it possible to manipulate the page stream right before shipping it out to the PDF?

Currently I create a vlist (with Lua) and call tex.shipout(my list). This gets translated to some BT / ET PDF operators and such. 

My goal is to rewrite the page stream contents. (How) is this possible?


Thanks

   Patrick