{ "mode": "info", "parameter": "lj4_font", "section": "", "url": "https://www.chedong.com/phpMan.php/info/lj4_font/json", "generated": "2026-07-05T15:54:57Z", "sections": { "NAME": { "content": "lj4font - groff fonts for use with devlj4\n", "subsections": [] }, "DESCRIPTION": { "content": "Nominally, all Hewlett-Packard LaserJet 4-series and newer printers\nhave the same internal fonts: 45 scalable fonts and one bitmapped\nLineprinter font. The scalable fonts are available in sizes between\n0.25 points and 999.75 points, in 0.25-point increments; the\nLineprinter font is available only in 8.5-point size.\n\nThe LaserJet font files included with groff assume that all printers\nsince the LaserJet 4 are identical. There are some differences between\nfonts in the earlier and more recent printers, however. The LaserJet 4\nprinter used Agfa Intellifont technology for 35 of the internal scal-\nable fonts; the remaining 10 scalable fonts were TrueType. Beginning\nwith the LaserJet 4000-series printers introduced in 1997, all scalable\ninternal fonts have been TrueType. The number of printable glyphs dif-\nfers slightly between Intellifont and TrueType fonts (generally, the\nTrueType fonts include more glyphs), and there are some minor differ-\nences in glyph metrics. Differences among printer models are described\nin the PCL 5 Comparison Guide and the PCL 5 Comparison Guide Addendum\n(for printers introduced since approximately 2001).\n\nLaserJet printers reference a glyph by a combination of a 256-glyph\nsymbol set and an index within that symbol set. Many glyphs appear in\nmore than one symbol set; all combinations of symbol set and index that\nreference the same glyph are equivalent. For each glyph, hpftodit(1)\nsearches a list of symbol sets, and selects the first set that contains\nthe glyph. The printing code generated by hpftodit is an integer that\nencodes a numerical value for the symbol set in the high byte(s), and\nthe index in the low byte. See grofffont(5) for a complete descrip-\ntion of the font file format; symbol sets are described in greater de-\ntail in the PCL 5 Printer Language Technical Reference Manual.\n\nTwo of the scalable fonts, Symbol and Wingdings, are bound to 256-glyph\nsymbol sets; the remaining scalable fonts, as well as the Lineprinter\nfont, support numerous symbol sets, sufficient to enable printing of\nmore than 600 glyphs.\n\nThe metrics generated by hpftodit assume that the DESC file contains\nvalues of 1200 for res and 6350 for unitwidth, or any combination\n(e.g., 2400 and 3175) for which res x unitwidth = 7620000. Although HP\nPCL 5 LaserJet printers support an internal resolution of 7200 units\nper inch, they use a 16-bit signed integer for cursor positioning; if\ndevlj4 is to support U.S. ledger paper (11 in x 17 in; in = inch), the\nmaximum usable resolution is 32767 / 17, or 1927 units per inch, which\nrounds down to 1200 units per inch. If the largest required paper size\nis less (e.g., 8.5 in x 11 in, or A5), a greater res (and lesser\nunitwidth) can be specified.\n", "subsections": [] }, "LIMITATIONS": { "content": "Font metrics for Intellifont fonts were provided by Tagged Font Metric\n(TFM) files originally developed by Agfa/Compugraphic. The TFM files\nprovided for these fonts supported 600+ glyphs and contained extensive\nlists of kerning pairs.\n\nTo accommodate developers who had become accustomed to TFM files, HP\nalso provided TFM files for the 10 TrueType fonts included in the\nLaserJet 4. The TFM files for TrueType fonts generally included less\ninformation than the Intellifont TFMs, supporting fewer glyphs, and in\nmost cases, providing no kerning information. By the time the Laser-\nJet 4000 printer was introduced, most developers had migrated to other\nmeans of obtaining font metrics, and support for new TFM files was very\nlimited. The TFM files provided for the TrueType fonts in the Laser-\nJet 4000 support only the Latin 2 (ISO 8859-2) symbol set, and include\nno kerning information; consequently, they are of little value for any\nbut the most rudimentary documents.\n\nBecause the Intellifont TFM files contain considerably more informa-\ntion, they generally are preferable to the TrueType TFM files even for\nuse with the TrueType fonts in the newer printers. The metrics for the\nTrueType fonts are very close, though not identical, to those for the\nearlier Intellifont fonts of the same names. Although most output us-\ning the Intellifont metrics with the newer printers is quite accept-\nable, a few glyphs may fail to print as expected. The differences in\nglyph metrics may be particularly noticeable with composite parenthe-\nses, brackets, and braces used by eqn(1). A script, located in /usr/\nshare/groff/1.22.4/font/devlj4/generate, can be used to adjust the met-\nrics for these glyphs in the special font \"S\" for use with printers\nthat have all TrueType fonts.\n\nAt the time HP last supported TFM files, only version 1.0 of the Uni-\ncode standard was available. Consequently, many glyphs lacking as-\nsigned code points were assigned by HP to the Private Use Area (PUA).\nLater versions of the Unicode standard included code points outside the\nPUA for many of these glyphs. The HP-supplied TrueType TFM files use\nthe PUA assignments; TFM files generated from more recent TrueType font\nfiles require the later Unicode values to access the same glyphs. Con-\nsequently, two different mapping files may be required: one for the HP-\nsupplied TFM files, and one for more recent TFM files.\n", "subsections": [] }, "FILES": { "content": "/usr/share/groff/1.22.4/font/devlj4/DESC\ndevice description file\n\n/usr/share/groff/1.22.4/font/devlj4/F\nfont description file for font F\n\n/usr/share/groff/1.22.4/font/devlj4/generate\ncorrects Intellifont-based height metrics for several glyphs in\nthe special font for TrueType CG Times (LaserJet 4000 and\nlater).\n", "subsections": [] }, "SEE ALSO": { "content": "groff(1), hpftodit(1), grolj4(1), grofffont(5)\n\ngroff 1.22.4 23 March 2022 LJ4FONT(5)", "subsections": [] } }, "summary": "lj4font - groff fonts for use with devlj4", "flags": [], "examples": [], "see_also": [ { "name": "groff", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/groff/1/json" }, { "name": "hpftodit", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/hpftodit/1/json" }, { "name": "grolj4", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/grolj4/1/json" }, { "name": "grofffont", "section": "5", "url": "https://www.chedong.com/phpMan.php/man/grofffont/5/json" } ] }