NoOp, Hardy had a completely different workflow, here Inkscape produced
PostScript, CUPS did page management on PostScript and then cups-pdf
turned the PostScript to PDF with Ghostscript. Ghostscript's "pdfwrite"
output device does not turn text characters into bitmaps.

>From Intrepid on, the printing workflow is PDF-centric. Applications are
supposed to send PDF to CUPS, like many applications including Inkscape
do, and CUPS to do the page management on PDF. The pdftops filter of
CUPS is primarily a PostScript printer driver in this scenario, but also
a fallback if some printer driver is not adapted to the new workflow,
like cups-pdf.

Most printer drivers are raster drivers, and printed paper you cannot
magnify arbitrarily. So there the rasterization of the document by the
pdftops driver is no big problem. cups-pdf plays a special role as it is
a vector driver creating PDFs for screen view, with the option of
arbitrary magnification. The best output quality you get here if you
avoid unneeded conversions. Therefore I have reported bug 385709 where I
suggest simple changes in cups-pdf to accept PDF directly to avoid
conversion to PostScript and back to PDF.

cups-pdf is also not necessarily needed nowadays, as most applications
(at least all KDE and GNOME applications, and also OpenOffice.org) can
generate PDF without a special CUPS queue, either via "Print to file" or
via "Export as PDF". Therefore cups-pdf was already demoted to Universe
and not shipped on the CDs any more.

-- 
pdftops CUPS filter has several problems
https://bugs.launchpad.net/bugs/382379
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