[pdftex] Re: [tex-k] writet1: font subsetting question
rhowlett at mail.usyd.edu.au
Sun Oct 21 13:23:55 CEST 2001
I notice that when I dvips and then distil tex files (using
distiller 3.0) the pdf files contain keys that say "/FontFile3"
and "/Subtype /Type1C" indicating that distiller has converted
the type1 font to Adobe's compact file format (CFF).
I wonder how much space this saves?
Tom Kacvinsky wrote:
> SENDING RESPONSE ONLY TO PDFTEX MAILING LIST.
> Hi Vladimir,
> pdftex subsets both subroutines and charstrings. The result dhould be the same
> as dvips, if one is using the dvips from TeX Live 6.0, and one is not subsetting
> a multiply re-enoded font.
> The subroutine numbers are not reordered. There were some issues earlier this
> year with pdftex generated PDF files and Acrobat 5.0, and when I went int the
> code to fix the problem, I didn't re-order the subroutines because I didn't have
> answers to some questions (for instance, what about calculated subroutine
> numbers [25 5 div callsubr])
> Now that the open questions I had have been answered, I could re-order the
> subroutines when they are substeed, but i haven't the time (right now) to do so.
> The problem is not making a new subss array with no gaps; the problem is
> rebuilding the charstrings/subroutines to call the appropriate newly numbered
> Speaking of gaps in the subroutines array: currently, if the subset Subrs array
> has gaps (i.e., there is room for 30 subroutines, but only 6 slots are used), I
> fill in the blank slots with an empty subroutine (just call return).
> That is what will chnage when I get around to sdoing things the "right" way. It
> should make embedded fonts smaller.
> On Tue, 16 Oct 2001, Vladimir Volovich wrote:
> > Hi,
> > i've been reported that PDF files generated with pdftex using cm-super
> > fonts are bigger than the ones generated via dvips+distiller.
> > could this be the result of preserving all Subrs entries in the
> > embedded fonts?
> > cm-super fonts have big number of Subrs entries, and if pdfTeX
> > downloads the font partially into a PDF file, does it reduce unused
> > Subrs entries (in addition to unused CharStrings entries)?
> > to remove unused Subrs entries, the writet1 module must analyse all
> > glyph and subrs charstrings, find out the used (possibly recursively)
> > Subrs entries, then reorder the Subrs (to avoid gaps), and store the
> > new glyph charstrings with changed references to subrs.
> > does pdftex do this for partial font downloading?
> > Best,
> > v.
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