Directory lout/maps - Lout Character Mapping (LCM) files
Jeffrey H. Kingston
14 March 1996
This directory contains Lout Character Mapping (LCM) files, which define
the names and codes of all characters known to Lout, plus various mappings.
Lout works with all characters via their codes, so it is not possible to
have an unencoded character.
LCM files replace the CEV and CMA files of previous versions of Lout. The
format has changed but the information in the files is consistent with the
old CEV and CMA files (no changes to the encodings, etc.). The format
change was needed to implement kerning of accented characters.
LCM files may contain blank lines and comment lines (which begin with #).
Each of the remaining lines defines one character, and must contain the
following entries, in order, separated by white space:
(1) Decimal character code, which must be unique in this file. These codes
must appear sorted into increasing order. Codes not mentioned in this
file have no associated character.
(2) Octal value of the decimal code, written in ASCII.
(3) Character name. Width and height information for a character with this
name must exist in every PostScript font metrics file that shares a Lout
fontdef with this file, but the character name need not be encoded in the
font metrics file, nor need any character code there agree with the
character code here. Lout will ensure (by including encoding vectors
in its output) that the character codes defined in this file apply, not
the codes in font metrics files.
The character name may be -none-, and this is equivalent to omitting the
line. There must be no subsequent entries on the line in this case.
If the character has entry UA below, and there is no kerning information
for the character in the font metrics file, Lout will apply the kerning
information for the corresponding unaccented character to the accented
character. This is always a good thing to do.
If the character has entry UA below, and there is no entry in some
font metrics file for the character, then (contrary to the above)
instead of complaining that the character is missing from the font
metrics file, Lout will silently apply the size information for
the corresponding unaccented character to the accented character.
Lout will still print the character code for the accented character,
however. This is always good horizontally but occasionally not
enough space is allowed for the character vertically.
(4) Zero or more functions, each beginning with a string identifying which
function it is, and followed by function-dependent information ending
in a semicolon. Functions may appear in any order; omitting a function
is fine and means that the function does not apply to that character.
At present the functions are
UC <charname>; Corresponding upper-case character (must be the
name of a character appearing elsewhere in the
same file). This entry is used by Lout when
producing small capitals.
LC <charname>; Corresponding lower-case character (must be the
name of a character appearing elsewhere in the
same file). This entry is not currently used.
UA <charname>; Corresponding unaccented character (must be the
name of a character appearing elsewhere in the
same file). This entry is used by Lout to
guess size and kerning information for accented
characters (when this information is missing from
some font metrics file) by using the size and
kerning information of the corresponding unaccented
character.
AC <charname>; Name of the accent character (acute, ogonek, etc.)
that forms the accent of this character (must be the
name of a character appearing elsewhere in the
same file). This entry is not currently used.
The particular LCM files in this directory are:
Std.LCM The StandardEncoding encoding vector, exactly as on page
598 of the PostScript LRM 2nd Ed., plus the mappings.
Latin1.LCM The ISOLatin1Encoding encoding vector, exactly as on page
599 of the PostScript LRM 2nd Ed., plus the mappings.
This is not usable with Lout as is because the ligature
characters fi and fl have no encoding, and because the
standard packages use characters not in this encoding.
LtLatin1.LCM Equal to Latin1.LCM augmented with some other characters
used by Lout and its standard packages. See the header
in the file for the details.
LtLatin2.LCM Similar to LtLatin1.LCM but uses the Latin2 character set.
koi8r.LCM For Russian
Symb.LCM The Symbol encoding vector, exactly as on page 606 of the
PostScript LRM 2nd Ed., plus mappings.
Ding.LCM The Zapf Dingbats encoding vector, taken from the Zapf
Dingbats font metrics file, plus mappings.
null.LCM Useful skeleton file for building LCM files.
