hbf2gf - Online in the Cloud

PROGRAM:

NAME

hbf2gf - convert a CJK bitmap font into subfonts usable by TeX and Omega.

SYNOPSIS

hbf2gf [-q] configuration-file[.cfg]
hbf2gf [-q] [-p] [-g] [-n] subfont-name x-resolution [y-scale | y-resolution]
hbf2gf -t [-q] subfont-name
hbf2gf --version | --help

DESCRIPTION

CJK bitmap fonts can't be directly used with TeX because the number of characters in such
fonts exceeds 256, the limit of a TeX font. Thus it is necessary to split these fonts
into subfonts, and this is exactly what hbf2gf does.

As the name says, hbf2gf uses CJK fonts in a certain format which is called Hanzi Bitmap
Font (HBF) format. It simply consists of the CJK bitmap file(s) and a text file in a
format very similar to the BDF format of the X Window System which describes the bitmap
font files: the encoding, the size, etc. The produced GF files can then be converted with
gftopk into standard PK files.

hbf2gf can be called in three modes:

hbf2gf [-q] configuration-file[.cfg]

This call normally creates a set of GF files, one PL file, and a batch file which
must be executed after hbf2gf has finished. This script will then call gftopk to
convert all GF files into PK files, and it will call pltotf to convert the PL file
into a TFM file. Finally it will copy the TFM file so that each PK file has its TFM
file (which are all identical).

If ofm_file is set to ‘yes’ in the configuration file, OFM and OVF files will be
created too.

-q makes hbf2gf quiet.

hbf2gf [-q] [-p] [-g] [-n] subfont-name x-resolution [y-scale | y-resolution]

This mode is intended for use with mktexpk and its derivates. Only one GF file
together with a PL file for the given subfont will be computed, taking the horizontal
resolution and a vertical scaling factor (if the value is smaller than 10) resp. the
vertical resolution (otherwise) from the command line, ignoring the nmb_fonts
parameter of the configuration file. The last two characters (which are interpreted
as the subfont number) are stripped to get the name for the configuration file (which
must end with ‘.cfg’). No job file will be created. If option -p is set, no PL file
is created. If -g is set, no GF file is created. The extension can be controlled
with -n; if set, the extension is ‘.gf’, otherwise ‘.<resolution>gf’. -q makes
hbf2gf quiet.

hbf2gf -t [-q] subfont-name

This mode is intended for use with scripts like mktexpk; it tests whether the
specified subfont name leads to an hbf2gf configuration file. It returns 0 on
success and prints out the name of that configuration file (provided the -q switch
isn't set). This test isn't a thorough one; it only removes the last two characters
and checks whether a configuration file with that name exists.

See the next section for more details about configuration files.

Specifying the option --version returns the current version of hbf2gf and the used file
search library (e.g. kpathsea). Usage information is shown with the --help parameter.

CONFIGURATION FILE

Here a sample configuration file (gsfs14.cfg) for a 56×56 Chinese font in GB encoding;
note that all information about the font is in the jfs56.hbf file. See the FILE SEARCHING
section how HBF fonts and hbf2gf configuration files are found. See the AVAILABILITY
section where to get CJK fonts together with its HBF files:

hbf_header jfs56.hbf
mag_x 1
threshold 128
comment jianti fansongti 56x56 pixel font

design_size 14.4

y_offset -13

nmb_files -1

output_name gsfs14

checksum 123456789

dpi_x 300

pk_files no
tfm_files yes

coding codingscheme GuoBiao encoded TeX text

pk_directory $HBF_TARGET/pk/modeless/gb2312/gsfs14/
tfm_directory $HBF_TARGET/tfm/gb2312/gsfs14/

A configuration file is a plain text file consisting of keywords and its arguments. A
keyword must start a line, otherwise the whole line will be ignored. If the word starting
a line is not a keyword, the line will be ignored too. Empty lines will also be skipped.
The search for keywords is case insensitive; in contrast, the arguments will be taken
exactly as given (except ‘yes’ and ‘no’ which can be written with uppercase or lowercase
letters). Each keyword has one argument which must be separated by whitespace (blanks or
tabs) from the keyword and must be on the same line. Each line must not be longer than
256 characters.

You can use environment variables in the configuration file. The escape character
starting an environment variable in the configuration file is always ‘$’, even for
operating systems like DOS which has other conventions. hbf2gf recognizes only
environment variable names which start with a letter or an underscore, followed by
alphanumeric characters or underscores. You can surround the variable with braces to
indicate where the variable name ends, for example ${FOO}. To get a dollar sign you must
write ‘$$’. The expansion of environment variables in hbf2gf itself (without the help of
either kpathsea, emtexdir, or MiKTeX searching routines) is very limited; this feature has
been carried over from previous versions. It can't expand variables set in texmf.cnf; it
also can't handle more than one directory as the variable's value. Don't use it except
for the ‘pk_directory’ and ‘tfm_directory’ parameters!

This is the list of all necessary keywords:

hbf_header
The HBF header file name of the input font(s). hbf2gf uses the given searching
mechanism (kpathsea, emtexdir, or MiKTeX) to locate this file.

output_name
The name stem of the output files. A running two digit decimal number starting
with ‘01’ will be appended. For Unicode fonts see the keyword unicode below. This
value is in almost all cases identical to the name of the configuration file.

And now all optional keywords:

x_offset
Increases the character width. Will be applied on both sides; default for non-
rotated glyphs is the value given in the HBF header (HBF_BITMAP_BOUNDING_BOX)
scaled to design_size (in pixels).

y_offset
Shifts all characters up or down; default for non-rotated glyphs is the value given
in the HBF header (HBF_BITMAP_BOUNDING_BOX) scaled to design_size (in pixels).

design_size
The design size (in points) of the font. x_offset and y_offset refer to this size.
Default is 10.0.

slant The slant of the font (given as Delta_x / Delta_y). Only values in the range
0 ≤ slant ≤ 1 are allowed. Default is 0.0.

rotation
If set to ‘yes’, all glyphs will be rotated 90 degrees counter-clockwise. The
default offsets as given in the HBF header will be ignored (and set to 0). Default
is ‘no’.

mag_x
mag_y Scaling values of the characters to reach design size. If only one magnification
is given, x and y values are assumed to be equal. Default is mag_x = mag_y = 1.0.

threshold
A value between 1 and 254 defining a threshold for converting the internal graymap
into the output bitmap; lower values cut more pixels. Default value is 128.

comment
A comment describing the font; default is none.

nmb_fonts
The number of subfonts to create. Default value is -1 for creating all fonts.

unicode
If ‘yes’, a two digit hexadecimal number will be used as a running number, starting
with the value of the first byte of the first code range. Default is ‘no’.

min_char
The minimum value of the encoding. You should set this value to get correct
subfile offsets if it is not identical to the lowest character code in the HBF
file.

dpi_x
dpi_y The horizontal and vertical resolution (in dpi) of the printer. If only one
resolution is given, x and y values are assumed to be equal. Default is 300.

checksum
A checksum to identify the GF files with the appropriate TFM files. The default
value of this unsigned 32bit integer is 0.

coding A comment describing the coding scheme; default is none.

pk_directory
The destination directory of the PK files; default: none. Attention! The batch
file will not check whether this directory exists.

tfm_directory
The destination directory of the TFM files; default: none. Attention! The batch
file will not check whether this directory exists.

pk_files
Whether to create PK files or not; default is ‘yes’.

tfm_files
Whether to create TFM files or not; default is ‘yes’.

ofm_file
Whether to create an OPL file or not; default is ‘no’. The batch file will then
use ovp2ovf of the Omega distribution to convert it into an OFM and an OVF file.
The OPL file simply maps all subfonts back to a single Omega font.

long_extension
If ‘yes’, PK files will include the resolution in the extension (e.g.
gsso1201.300pk). This affects the batch file only (default is ‘yes’).

rm_command
The shell command to remove files; default: ‘rm’.

cp_command
The shell command to copy files; default: ‘cp’.

job_extension
The extension of the batch file which calls gftopk and pltotf to convert the GF and
the PL files into PK and TFM files respectively; default is none.

FILE SEARCHING

hbf2gf uses either the kpathsea, emtexdir, or MiKTeX library for searching files (emtexdir
will work only on operating systems which have an MS-DOSish background, i.e., MS-DOS,
OS/2, Windows; MiKTeX is for Win32 systems).

kpathsea
The actual version of kpathsea is displayed on screen if you call hbf2gf --version.

Here is a table of the file type and the corresponding kpathsea variables.

.hbf MISCFONTS
.cfg HBF2GFINPUTS

Please consult the info files of kpathsea for details on these variables. The decision
which naming scheme to use for variables will be done during compilation.

You should set the TEXMFCNF variable to the directory where your texmf.cnf configuration
file resides.

Here is the proper command to find out to which value a kpathsea variable is set (we use
MISCFONTS as an example). This is especially useful if a variable isn't set in texmf.cnf
or in the environment, thus pointing to the default value which is hard-coded into the
kpathsea library.

kpsewhich -progname=hbf2gf -expand-var='$MISCFONTS'

We select the program name also since it is possible to specify variables which are
searched only for a certain program – in our example it would be MISCFONTS.hbf2gf.

A similar but not identical method is to say

kpsewhich -progname=hbf2gf -show-path='misc fonts'

[A full list of format types can be obtained by saying ‘kpsewhich --help’ on the command
line prompt.] This is exactly how hbf2gf searches for files; the disadvantage is that all
variables are expanded which can cause very long strings.

emtexdir
Here the list of suffixes and its related environment variables to be set in autoexec.bat
(resp. in config.sys for OS/2):

.hbf HBFONTS
.cfg HBFCFG

If one of the variables isn't set, a warning message is emitted. The current directory
will always be searched. As usual, one exclamation mark appended to a directory path
causes subdirectories one level deep to be searched, two exclamation marks causes all
subdirectories to be searched. Example:

HBFONTS=c:\fonts\hbf!!;d:\myfonts\hbf!

Constructions like ‘c:\fonts!!\hbf’ aren't possible.

MikTeX
Please consult the documentation files of MiKTeX for more details.

LIMITATIONS

The x and y output size must not exceed MAX_CHAR_SIZE, which is defined at compile time;
its default value is 1023 (pixel).

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