[pdftex] AR 5 not working with pdftex?

[Tom Kacvinsky]

Louis,

Do you mean that ATM does not parse subroutine 4, but rather, when it sees
subroutine 4 being called ina charstring, ATM uses its own internal
representation of subroutine 4 to activate hint replacement?

That is what I thought happened...

But pdftex does not change this "linkage".  The last time I looked at the
subsetting code in pdftex, it leaves the subroutine numbers alone, and just
removes the routines that are not needed (so there are gaps in the resultant
Type 1 font's Subrs array).

Tom

On Sat, 2 Jun 2001, Y&Y Support wrote:

> Interesting observation!
>
> At 23:36 2001-06-02 +1000, Robert Howlett wrote:
>
> >It seems that Acrobat Reader 5 objects only to some of the
> >characters in cmr10.pfb; specifically, characters
> >13, 14, 15, 25, 26, 30, 36, 37, 51, 52, 53, 54, 62, 63,
> >66, 71, 82, 83, 97, 98, 100, 103, 105, 106, 109, 110, 112,
> >113, 114, and 115.
>
> Looking at the glyphnames rather than the numeric codes:
> fl, ffi, ffl, germandbls, ae, OE, dollar, percent,
> three, four, five, six, questiondown, question,
> B, G, R, S, a, b, d, g, i, j, m, p, q, r, s ...(*)
>
> Anyone see the pattern?
>
> Those are characters that require hint replacement.
> For example, in the digit three, the upper bow is shifted
> left slightly relative to the lower box and so has to be hinted
> separately. Ditto for the upper and lower bowls in "B".
> And so on.
>
> Looking at the BSR/Y&Y/AMS et al fonts
> http://www.ams.org/index/tex/type1-fonts.html
> one sees that the above glyphs in CMR10.PFB
> all use hint replacements
> (the newer Y&Y versions
> http://www.yandy.com/river/setdetail-CM.htm
> have additional hint replacement code).
>
> The hint replacement is done via subroutine call.
> In "modern" Type 1 fonts (less than ten years old)
> this tends to be done via a standardized call to
> subroutine 4.
>
> Some software (such as ATM)
> --- which does not understand PostScript --- does not
> interpret the subroutines.  So if you change this
> linkage for hint replacement it will break things.
>
> I wouldn't be surprised if there is some cleverness in
> the output from pdfTeX that trips up Acrobat.
> When it comes to font handling it pays to
> "program to the lowest common denominator".
>
> Regards, Louis.
>
> (*) Actually the CMR10.PFB pulled off the AMS server
> also has hint replacement in fi, eight, nine, n and u.
> It's odd that those don't trigger the same problem,
> but maybe the test list given above wasn't quite complete...
>
> P.S. These "problems" with Acrobat 5 Reader do not
> occur with PDF files made using Y&Y TeX/DVIPSONE
> and Distiller 4 or Distiller 5.
>
> >  For all of these I got the "an error
> >occurred while downloading a font, the file may not
> >print correctly" message (on a document with just the
> >one character). Other characters were OK.
> >Putting << in the map file didn't actually solve the problem,
> >because the characters listed above were still substituted
> >by characters from Courier at printing. In particular,
> >ligatures that Courier doesn't have were missing.
> >
> >I tried using cmr10.ttf instead of cmr10.pfb. Sometimes
> >I still get the same error, sometimes I don't.
> >
> >Bob Howlett
> >
> >"Christopher S. Swingley" wrote:
> > >
> > > Than,
> > >
> > > > The map files that are listed in your pdftex.cfg (usually under
> > > > $TEXMF/pdftex/config)
> > >
> > > Thanks, I found it in /etc/texmf/dvips/pdftex.map and changed the '<'
> > > to '<<'.  This solves the problem with it being unable to download
> > > one of the fonts (so the font isn't substituted in the printout),
> > > but it causes another -- the ligatures are missing!  Acrobat and
> > > Acrobat Reader 5.0 show them correctly on the screen, but there is
> > > a blank space on the printed copy.
> > >
> > > Chris
> > > --
> > > Christopher S. Swingley         930 Koyukuk Drive
> > > System / Network Manager        University of Alaska Fairbanks
> > > IARC -- Frontier Program        Fairbanks, AK 99775
> > >
> > > phone: 907-474-2689             fax: 907-474-2643
> > > email: cswingle at iarc.uaf.edu    GNUPG and PGP2 keys at my web site
> > >   web: http://www.frontier.iarc.uaf.edu/~cswingle
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