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           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  scal-
           able  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 dif-
           fers slightly between Intellifont and TrueType  fonts  (generally,  the
           TrueType  fonts  include more glyphs), and there are some minor differ-
           ences 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 combinations 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 numerical 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 Man-
           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 resolution 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


           Font metrics for Intellifont fonts were provided by Tagged Font  Metric
           (TFM)  files  originally developed by Agfa/Compugraphic.  The TFM files
           provided for these fonts supported 600+ glyphs and contained  extensive
           Because  the  Intellifont  TFM files contain considerably more informa-
           tion, 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  accept-
           able,  a  few glyphs may fail to print as expected.  The differences in
           glyph metrics may be particularly noticeable with  composite  parenthe-
           ses,  brackets,  and  braces  used  by  eqn(1).   A  script, located in
           /usr/share/groff/1.21/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  available.   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 outside 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.  Con-
           sequently, two different mapping files may be required: one for the HP-
           supplied TFM files, and one for more recent TFM files.


                  Device description file.
                  Font description file for font F.


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

    Groff Version 1.21 31 December 2010 LJ4_FONT(5)


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