From: Bill McClain <wmcclain@salamander.com>
Cc: "ntg-context@ntg.nl" <ntg-context@ntg.nl>
Subject: Re: more on missing ligatures
Date: Mon, 11 Mar 2002 07:29:34 -0600 [thread overview]
Message-ID: <3C8CB13E.27EB6A4E@salamander.com> (raw)
In-Reply-To: <5.1.0.14.1.20020311012551.02bcecb0@server-1>
Hans Hagen wrote:
> Now, tex itself only needs the tfm file but dvips and the pdftex backend
> need the vf file in order to construct composed or manipulated glyphs. So,
> when vf was introduced, tex was not adapted, but dvips was,
>
> I must admit that this model is not that clear -)
Ah! I think I see it now. This means the examples on my help page were
wrong also; I was referencing raw files when I shouldn't have. I've
corrected that now.
To summarize:
My mistake was thinking that the font names used in a tex job had to be
those listed in the map file. (And this happened to be true in my early
tests because the fonts I was using were not virtual). But, as you point
out, the map file is for the backend: associating a tfm file with the
glyph repository (pfb).
Tex (I have just learned), given a font name, searches in the usual font
places for a tfm file. Magically, it knows when a tfm has virtual vf
file of the same name. The vf file contains references to other tfm or
vf files. Eventually, when the backend runs, it needs the mapping from a
tfm to a pfb.
Using a real example:
Texfont produced for me:
texmf/fonts/tfm/adobe/sabon/texnansi-raw-sar.tfm
texmf/fonts/tfm/adobe/sabon/texnansi-sar.tfm
texmf/fonts/vf/adobe/sabon/texnansi-sar.tfm
and a map file which contains:
texnansi-raw-sar Sabon-Roman 4 < sar_____.pfb texnansi.enc
In my setup for this font, I use:
\definefontsynonym[Sabon-Roman][texnansi-sar][encoding=texnansi]
Tex finds and uses the virtual font, which has the ligature info (the
raw file doesn't!)
The virtual font has a link to the raw font:
vftovp texnansi-sar | grep FONTNAME
(FONTNAME texnansi-raw-sar)
When the backend needs to generate the glyphs, it uses the
texnansi-raw-sar entry in the map file to find the pfb and encoding.
Simple, eh? (Honestly, bundling resources together has been a problem on
many systems I have used. Anyone ever program the Macintosh?)
-Bill
prev parent reply other threads:[~2002-03-11 13:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-08 16:56 Bill McClain
2002-03-09 20:38 ` Bill McClain
2002-03-11 0:34 ` Hans Hagen
2002-03-11 13:29 ` Bill McClain [this message]
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