Only export visible rows? (display:none; NOT filtered by TableTools or DataTables)

Hi,

I've got an existing table where the only function I need from TableTools is to be able to save XLS files (csv).
I've got it working, but I've got an existing functions which sets some of the rows to display:none;.
How can I export only the visible rows?

(I don't want to remove any rows from the DOM! Because the user switches forth and back between hiding and showing some of the rows)