On Mon 24th May, 2010 at 12:19, Lars Hellström seems to have written:
[email protected] skrev:
On Sat 22nd May, 2010 at 00:11, [email protected] seems to have written:
On Fri 21st May, 2010 at 17:59, Lars Hellström seems to have written:
Dr. Clea F. Rees skrev:
I am trying to update CFRLatinModern for version 2.004 of Latin Modern
(included in TL 2009 which I recently updated to). While I'm at it, I
was hoping to resolve some of the issues which I or others raised about
the earlier version of the package. (The aim of the package is to make
various features of the fonts, especially different styles of figures,
easily accessible in LaTeX.)
The following is bugging me a lot: when using the small-caps version of
the font, accent placement for characters which must be created "on
the fly" are wrong. Not only are the accents too low for the small-caps
themselves, they are too low for the capital letters as well. So if I'm
using T1 encoding, \^A is fine but \^W and \^Y are not; similarly for
\^a versus \^w and \^y.
I don't expect these characters to look great because TeX is creating
them on the fly, but my package creates output markedly worse than that
produced by using lmodern itself and I cannot figure out why. The
accents are placed much lower so they run into the letter below.
This isn't a problem for the non-small-caps variants of the fonts - the
output produced by my package doesn't look any worse than that output
by lmodern for these characters.
I did notice that fontdimen 10 and 12 differ in lmr10.afm and
Numbered fontdimens in AFMs? News to me, unless you mean AFM keywords
corresponding to acccapheight and maxheight.
Probably I'm explaining badly. There are a bunch of lines starting:
Comment TFM fontdimen <number>: <number> (text)
OK, that was news to me, and your explanation is reasonably clear.
lmcsc10.afm. These are both smaller in the case of lmcsc10.afm which
seems odd. But I'm assuming this is just my ignorance since lmodern is
obviously based on these dimensions and everything works fine there.
One fontdimen that is likely to be important is xheight (fontdimen 5), as
TeX's \accent primitive assumes the accent character specified is in the
proper position for a glyph with \height{}=xheight. If for example the
smallcaps xheight is larger than the regular xheight, but you're using
the regular accent in the smallcaps font, then you would get the effect
that it is placed too low.
grep XHeight lmr10.afm lmcsc10.afm gives:
lmr10.afm:XHeight 430.55556
lmcsc10.afm:XHeight 513.88889
grep xheight lmr10.afm lmcsc10.afm gives:
lmr10.afm:Comment TFM fontdimen 5: 4.3055 (xheight)
lmcsc10.afm:Comment TFM fontdimen 5: 4.3055 (xheight)
So would fontinst be using the first or the second?
Fontinst uses the first, i.e., the xheight that the AFM file formally states.
AFM Comment's are just ignored.
This difference is probably the root of your problems; with a larger xheight
in lmcsc than in lmr, TeX thinks it needs to raise the accent less in the
former than in the latter.
Regarding fontdimen 12 (which I think is "max height" based on the
It is in T1-encoded fonts (and several other newer text font encodings). Math
fonts may require it to be something else.
afm), the dimension is smaller in lmcsc10.afm than in lmr10.afm but
larger in ec-lmcsc10.tfm than in ec-lmr10.tfm:
lmr10.afm:Comment TFM fontdimen 12: 11.27 (non-standard: max
height)
lmcsc10.afm:Comment TFM fontdimen 12: 11 (non-standard: max
height)
ec-lmr10.tfm: (PARAMETER D 12 R 0.932001)
ec-lmcsc10.tfm: (PARAMETER D 12 R 0.933001)
Are those TFMs which come with the latin modern fonts? Curious, in that case,
that they have two different values.
Yes. These are the ones that come with the fonts. (I just used tftopl
to look at the values.)
On the other hand, when I use fontinst to generate tfms, I end up with
this dimension being larger for lmr10 than lmcsc10:
clmr8t10.pl: (PARAMETER D 12 R 1.127)
clmcsc8t10.pl: (PARAMETER D 12 R 1.1)
That's the same as in the AFM lines you quote, so it looks as though you at
least have these right.
A remark on the varying magnitudes of these numbers: PLs and TFMs tend to
take 1 length unit as equal to the font size. AFMs, and fontinst internally,
use 1000 length units equal to the font size. The AFM comments quoted seem to
use pt as length unit, which for a 10pt font means 10 length units is equal
to the font size.
All of which leaves me suspecting that I really don't understand even
the bits of this I previously thought I did understand. The
relationship between the afms and tfms when I generate the tfms using
fontinst makes sense to me, but how do the dimensions end up not only
differing in the tfms included with Latin Modern but actually reversing
relationships such as "greater than" and "less than"?!
I assumed that the tfms provided in Latin Modern would be derived from
the afms but now I'm wondering if that's so...
One would expect that they are at least generated from the same source, but
the fact that the AFMs contain hints about what would be good TFM fontdimens,
which the TFMs don't seem to care about, indicates there is something odd
about the toolchain producing these files.
Any idea about what tool produced the AFMs? I can imagine e.g. Fontforge
being "smart" enough to know about TeX fontdimens and trying to compute
proper values for them, whereas I think the lmodern fonts were generated
using a MetaPost-based tool that may well have a separate TFM-generation
capability. In that case, the TFMs may actually be closer to the designers'
intentions.
MetaType1 is used to generate the fonts, AFMs etc. Here are the
relevant parts of the various files.
--- lmr10.afm ---
StartFontMetrics 2.0
Comment Generated by MetaType1 (a MetaPost-based engine)
...
FontName LMRoman10-Regular
FullName LMRoman10-Regular
FamilyName LMRoman10
Weight Normal
ItalicAngle 0
IsFixedPitch false
UnderlinePosition -146
UnderlineThickness 40
Version 2.004
EncodingScheme FontSpecific
FontBBox -430 -290 1417 1127
CapHeight 683.33333
XHeight 430.55556
Descender -194.44444
Ascender 694.44444
Comment PFM parameters: LMRoman10 0 0 0xEE
Comment TFM designsize: 10 (in points)
Comment TFM fontdimen 1: 0 (slant)
Comment TFM fontdimen 2: 3.33333 (space)
Comment TFM fontdimen 3: 1.66667 (space stretch)
Comment TFM fontdimen 4: 1.11111 (space shrink)
Comment TFM fontdimen 5: 4.3055 (xheight)
Comment TFM fontdimen 6: 10 (quad)
Comment TFM fontdimen 7: 1.11111 (extra space)
Comment TFM fontdimen 8: 6.833 (non-standard: uc height)
Comment TFM fontdimen 9: 6.9445 (non-standard: ascender)
Comment TFM fontdimen 10: 11.27 (non-standard: accented cap height)
Comment TFM fontdimen 11: 1.94443 (non-standard: descender depth)
Comment TFM fontdimen 12: 11.27 (non-standard: max height)
Comment TFM fontdimen 13: 2.9 (non-standard: max depth)
Comment TFM fontdimen 14: 5 (non-standard: digit width)
Comment TFM fontdimen 15: 0.88889 (non-standard: uc stem)
Comment TFM fontdimen 16: 12 (non-standard: baselineskip)
Comment TFM fontdimen 17: 0.69444 (non-standard: lc stem)
Comment TFM fontdimen 18: 0.55556 (non-standard: u, i.e., font unit)
Comment TFM fontdimen 19: 0.22223 (non-standard: overshoot)
Comment TFM fontdimen 20: 0.25 (non-standard: thin stem, hair)
Comment TFM fontdimen 21: 0.30556 (non-standard: cap thin stem, i.e.,
cap_hair)
Comment TFM headerbyte 9: FontSpecific
Comment TFM headerbyte 49: LMRoman10
Comment TFM headerbyte 72: 234
...
--- lmcsc10.afm ---
StartFontMetrics 2.0
Comment Generated by MetaType1 (a MetaPost-based engine)
...
FontName LMRomanCaps10-Regular
FullName LMRomanCaps10-Regular
FamilyName LMRomanCaps10
Weight Normal
ItalicAngle 0
IsFixedPitch false
UnderlinePosition -146
UnderlineThickness 40
Version 2.004
EncodingScheme FontSpecific
FontBBox -496 -290 1501 1100
CapHeight 683.33333
XHeight 513.88889
Descender -194.44444
Ascender 694.44444
Comment PFM parameters: LMRomanCaps10 0 0 0xEE
Comment TFM designsize: 10 (in points)
Comment TFM fontdimen 1: 0 (slant)
Comment TFM fontdimen 2: 3.77774 (space)
Comment TFM fontdimen 3: 1.75 (space stretch)
Comment TFM fontdimen 4: 1.16667 (space shrink)
Comment TFM fontdimen 5: 4.3055 (xheight)
Comment TFM fontdimen 6: 11.0555 (quad)
Comment TFM fontdimen 7: 1.16667 (extra space)
Comment TFM fontdimen 8: 6.833 (non-standard: uc height)
Comment TFM fontdimen 9: 6.9445 (non-standard: ascender)
Comment TFM fontdimen 10: 11 (non-standard: accented cap height)
Comment TFM fontdimen 11: 1.94443 (non-standard: descender depth)
Comment TFM fontdimen 12: 11 (non-standard: max height)
Comment TFM fontdimen 13: 2.9 (non-standard: max depth)
Comment TFM fontdimen 14: 5.528 (non-standard: digit width)
Comment TFM fontdimen 15: 0.88889 (non-standard: uc stem)
Comment TFM fontdimen 16: 12 (non-standard: baselineskip)
Comment TFM fontdimen 17: 0.69444 (non-standard: lc stem)
Comment TFM fontdimen 18: 0.58333 (non-standard: u, i.e., font unit)
Comment TFM fontdimen 19: 0.22223 (non-standard: overshoot)
Comment TFM fontdimen 20: 0.25 (non-standard: thin stem, hair)
Comment TFM fontdimen 21: 0.30556 (non-standard: cap thin stem, i.e.,
cap_hair)
Comment TFM headerbyte 9: FontSpecific
Comment TFM headerbyte 49: LMRomanCaps10
Comment TFM headerbyte 72: 234
...
--- ec-lmr10.tfm (TFM supplied with Latin Modern) ---
(FAMILY LMROMAN10)
(FACE O 352)
(CODINGSCHEME EC ENCODING /CORK/)
(DESIGNSIZE R 10.0)
(COMMENT DESIGNSIZE IS IN POINTS)
(COMMENT OTHER SIZES ARE MULTIPLES OF DESIGNSIZE)
(CHECKSUM O 25640215007)
(FONTDIMEN
(SLANT R 0.0)
(SPACE R 0.333333)
(STRETCH R 0.166667)
(SHRINK R 0.111112)
(XHEIGHT R 0.43055)
(QUAD R 1.0)
(EXTRASPACE R 0.111112)
(PARAMETER D 8 R 0.683299)
(PARAMETER D 9 R 0.69445)
(PARAMETER D 10 R 0.0)
(PARAMETER D 11 R 0.194443)
(PARAMETER D 12 R 0.932001)
(PARAMETER D 13 R 0.289999)
(PARAMETER D 14 R 0.5)
(PARAMETER D 15 R 0.088888)
(PARAMETER D 16 R 1.2)
(PARAMETER D 17 R 0.069445)
(PARAMETER D 18 R 0.055555)
(PARAMETER D 19 R 0.0222225)
(PARAMETER D 20 R 0.025)
(PARAMETER D 21 R 0.030556)
)
--- ec-lmcsc10.tfm (TFM supplied with Latin Modern) ---
(FAMILY LMROMANCAPS10)
(FACE O 352)
(CODINGSCHEME EC ENCODING /CORK/)
(DESIGNSIZE R 10.0)
(COMMENT DESIGNSIZE IS IN POINTS)
(COMMENT OTHER SIZES ARE MULTIPLES OF DESIGNSIZE)
(CHECKSUM O 25042402574)
(FONTDIMEN
(SLANT R 0.0)
(SPACE R 0.377774)
(STRETCH R 0.175)
(SHRINK R 0.116667)
(XHEIGHT R 0.43055)
(QUAD R 1.10555)
(EXTRASPACE R 0.116667)
(PARAMETER D 8 R 0.683299)
(PARAMETER D 9 R 0.69445)
(PARAMETER D 10 R 0.0)
(PARAMETER D 11 R 0.194443)
(PARAMETER D 12 R 0.933001)
(PARAMETER D 13 R 0.289999)
(PARAMETER D 14 R 0.5528)
(PARAMETER D 15 R 0.088888)
(PARAMETER D 16 R 1.2)
(PARAMETER D 17 R 0.069445)
(PARAMETER D 18 R 0.058332)
(PARAMETER D 19 R 0.0222225)
(PARAMETER D 20 R 0.025)
(PARAMETER D 21 R 0.030556)
)
--- clmr8t10.tfm (TFM generated with fontinst) ---
(FAMILY UNSPECIFIED)
(FACE F MRR)
(CODINGSCHEME EXTENDED TEX FONT ENCODING - CFR LM)
(DESIGNSIZE R 10.0)
(COMMENT DESIGNSIZE IS IN POINTS)
(COMMENT OTHER SIZES ARE MULTIPLES OF DESIGNSIZE)
(CHECKSUM O 14304534075)
(FONTDIMEN
(SLANT R 0.0)
(SPACE R 0.333)
(STRETCH R 0.2)
(SHRINK R 0.08)
(XHEIGHT R 0.431)
(QUAD R 1.0)
(EXTRASPACE R 0.08)
(PARAMETER D 8 R 0.683)
(PARAMETER D 9 R 0.694)
(PARAMETER D 10 R 0.892)
(PARAMETER D 11 R 0.194)
(PARAMETER D 12 R 1.127)
(PARAMETER D 13 R 0.29)
(PARAMETER D 14 R 0.5)
(PARAMETER D 15 R 0.0)
(PARAMETER D 16 R 1.2)
)
--- clmcsc8t10.tfm (TFM generated with fontinst) ---
(FAMILY UNSPECIFIED)
(FACE F MRR)
(CODINGSCHEME EXTENDED TEX FONT ENCODING - CFR LM)
(DESIGNSIZE R 10.0)
(COMMENT DESIGNSIZE IS IN POINTS)
(COMMENT OTHER SIZES ARE MULTIPLES OF DESIGNSIZE)
(CHECKSUM O 30552436525)
(FONTDIMEN
(SLANT R 0.0)
(SPACE R 0.378)
(STRETCH R 0.227)
(SHRINK R 0.091)
(XHEIGHT R 0.514)
(QUAD R 1.0)
(EXTRASPACE R 0.091)
(PARAMETER D 8 R 0.683)
(PARAMETER D 9 R 0.694)
(PARAMETER D 10 R 0.892)
(PARAMETER D 11 R 0.194)
(PARAMETER D 12 R 1.1)
(PARAMETER D 13 R 0.29)
(PARAMETER D 14 R 0.553)
(PARAMETER D 15 R 0.0)
(PARAMETER D 16 R 1.2)
)
--- end ---
If the TFMs supplied with Latin Modern are a better guide than the
AFMs - which surely seems correct given the placement of accents in
typeset documents - what is the best way of (1) determining which
elements of the AFMs to override; and (2) actually overriding them? I
was experimenting by manually adjusting the value of xheight for the
small caps font using an additional metrics file, but I'm not sure
whether that's a good way to go about things.
--- change-xheight-sc-shapes.mtx ---
\relax
\metrics
\setint{xheight}{431}
\endmetrics
--- lines for fontinst ---
...
\transformfont{lmcsc8ttl10}{\reencodefont{t1-clm}{\fromafm{lmcsc10}}}
\transformfont{lmr8ttl10}{\reencodefont{t1-clm}{\fromafm{lmr10}}}
...
\installfont{clmr8t10}{lmr8ttl10,newlatin}{t1-clm}{T1}{clm}{m}{n}{<9.5-11>}
\installfont{clmcsc8t10}{change-xheight-sc-shapes,lmcsc8ttl10,newlatin}{t1-clm}{T1}{clm}{m}{sc}{}
...
--- end ---
Given that other dimensions also seem to differ between the AFM and TFM
files supplied with the fonts - and not just in the case of the small
caps shaps - I don't know what's important and what isn't (since I am
long out of my depth here).
Thanks _very_ much,
cfr
Lars Hellström
