[pdftex] Re: [tex-k] writet1: font subsetting question

[Tom Kacvinsky]

Quite a bit...  CFF fonts rock!  I don't have numbers, but I do know that a CFF
version of CMEX10 I made using Adobe's OpenType FDK is about half the size of
the PFB format.  And that is without subsetting.  Also, keep in mind that
Adobe's FDK makes more compact CFF fonts than distiller, because it ustilizes
subroutines and global subroutines, where as distiller does not.

Tom

On Sun, 21 Oct 2001, Robert Howlett wrote:

> 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?
>
> Bob Howlett
>
> ----------------
>
> 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
> > subroutine(s).
> >
> > 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.
> >
> > Tom
> >
> > 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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> > >
> >
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