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LJ4_FONT(5)									      LJ4_FONT(5)

NAME
       lj4_font - groff fonts for use with devlj4

DESCRIPTION
       Nominally, all Hewlett-Packard LaserJet 4-series and newer printers have the same internal
       fonts: 45 scalable fonts and one bitmapped  Lineprinter	font.	The  scalable  fonts  are
       available  in  sizes  between  0.25 point and 999.75 points, in 0.25-point increments; the
       Lineprinter font is available only in 8.5-point size.

       The LaserJet font files included with groff assume that all printers since the  LaserJet 4
       are  identical.	 There	are some differences between fonts in the earlier and more recent
       printers, however.  The LaserJet 4 printer used Agfa Intellifont technology for 35 of  the
       internal  scalable  fonts;  the remaining 10 scalable fonts were TrueType.  Beginning with
       the LaserJet 4000-series printers introduced in 1997, all  scalable  internal  fonts  have
       been  TrueType.	 The  number of printable glyphs differs slightly between Intellifont and
       TrueType fonts (generally, the TrueType fonts include more glyphs),  and  there	are  some
       minor differences in glyph metrics.  Differences among printer models are described in the
       PCL 5 Comparison Guide and the PCL 5 Comparison Guide Addendum  (for  printers  introduced
       since approximately 2001).

       LaserJet  printers  reference  a  glyph	by a combination of a 256-glyph symbol set and an
       index within that symbol set.  Many glyphs appear in more than one symbol set; all  combi-
       nations	of  symbol  set and index that reference the same glyph are equivalent.  For each
       glyph, hpftodit(1) searches a list of symbol sets, and selects the first set that contains
       the glyph.  The printing code generated by hpftodit(1) is an integer that encodes a numer-
       ical value for the symbol set in the high byte(s), and the index in  the  low  byte.   See
       groff_font(5)  for  a  complete	description  of  the  font  file  format; symbol sets are
       described in greater detail in the PCL 5 Printer Language Technical Reference Manual.

       Two of the scalable fonts, Symbol and Wingdings, are bound to 256-glyph symbol  sets;  the
       remaining  scalable  fonts, as well as the Lineprinter font, support numerous symbol sets,
       sufficient to enable printing of more than 600 glyphs.

       The metrics generated by hpftodit(1) assume that the DESC file contains values of 1200 for
       res  and  6350  for  unitwidth  (or  any  combination  (e.g.,  2400  and  3175)	for which
       res x unitwidth = 7620000).  Although HP PCL 5 LaserJet printers support an internal reso-
       lution of 7200 units per inch, they use a 16-bit signed integer for cursor positioning; if
       devlj4 is to support U.S. ledger paper (11'' x 17''), the  maximum  usable  resolution  is
       32767 / 17,  or	1927,  units  per inch, which rounds down to 1200 units per inch.  If the
       largest required paper size is less (e.g., 8.5'' x 11'' or A5), a greater resolution  (and
       lesser unitwidth) can be specified.

LIMITATIONS
       Font  metrics for Intellifont fonts were provided by Tagged Font Metric (TFM) files origi-
       nally developed by Agfa/Compugraphic.  The TFM files provided for  these  fonts	supported
       600+ glyphs and contained extensive lists of kern pairs.

       To  accommodate	developers  who  had become accustomed to TFM files, HP also provided TFM
       files for the 10 TrueType fonts included in the LaserJet 4.  The TFM  files  for  TrueType
       fonts  generally  included  less  information  than the Intellifont TFMs, supporting fewer
       glyphs, and in most cases, providing no kerning	information.   By  the	time  the  Laser-
       Jet 4000  printer was introduced, most developers had migrated to other means of obtaining
       font metrics, and support for new TFM files was very limited.  The TFM files provided  for
       the  TrueType fonts in the LaserJet 4000 support only the Latin 2 (ISO 8859-2) symbol set,
       and include no kerning information; consequently, they are of little value for any but the
       most rudimentary documents.

       Because	the  Intellifont  TFM files contain considerably more information, they generally
       are preferable to the TrueType TFM files even for use with the TrueType fonts in the newer
       printers.   The	metrics  for  the TrueType fonts are very close, though not identical, to
       those for the earlier Intellifont fonts of the same names.  Although most output using the
       Intellifont  metrics with the newer printers is quite acceptable, a few glyphs may fail to
       print as expected.  The differences in glyph metrics may be particularly  noticeable  with
       composite  parentheses,	brackets,  and	braces	used  by  eqn(1).   A  script, located in
       /usr/share/groff_font/devlj4/generate, can be used to adjust the metrics for these  glyphs
       in the special font S for use with printers that have all TrueType fonts.

       At the time HP last supported TFM files, only Version 1 of the Unicode standard was avail-
       able.  Consequently, many glyphs lacking assigned code points were assigned by HP  to  the
       Private	Use Area (PUA).  Later versions of the Unicode standard included code points out-
       side the PUA for many of these glyphs.  The HP-supplied TrueType TFM  files  use  the  PUA
       assignments;  TFM  files  generated from more recent TrueType font files require the later
       Unicode values to access the same glyphs.  Consequently, two different mapping  files  may
       be required: one for the HP-supplied TFM files, and one for more recent TFM files.

FILES
       /usr/share/groff_font/devlj4/DESC  Device description file.

       /usr/share/groff_font/devlj4/F	  Font description file for font F.

SEE ALSO
       groff(1), groff_diff(1), hpftodit(1), grolj4(1), groff_font(5)

Groff Version 1.19.2			  July 30, 2004 			      LJ4_FONT(5)
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