1.tr ~ 2.ig 3Copyright (C) 2004 Free Software Foundation, Inc. 4 5Permission is granted to make and distribute verbatim copies of 6this manual provided the copyright notice and this permission notice 7are preserved on all copies. 8 9Permission is granted to copy and distribute modified versions of this 10manual under the conditions for verbatim copying, provided that the 11entire resulting derived work is distributed under the terms of a 12permission notice identical to this one. 13 14Permission is granted to copy and distribute translations of this 15manual into another language, under the above conditions for modified 16versions, except that this permission notice may be included in 17translations approved by the Free Software Foundation instead of in 18the original English. 19.. 20.\" Like TP, but if specified indent is more than half 21.\" the current line-length - indent, use the default indent. 22.de Tp 23.ie \\n(.$=0:((0\\$1)*2u>(\\n(.lu-\\n(.iu)) .TP 24.el .TP "\\$1" 25.. 26.tr ~ 27.TH LJ4_FONT @MAN5EXT@ "@MDATE@" "Groff Version @VERSION@" 28.\" -------------------------------------------------------------------------- 29.SH NAME 30.\" -------------------------------------------------------------------------- 31lj4_font \- groff fonts for use with devlj4 32.\" -------------------------------------------------------------------------- 33.SH DESCRIPTION 34.\" -------------------------------------------------------------------------- 35Nominally, all Hewlett-Packard LaserJet~4\(enseries and newer printers 36have the same internal fonts: 45 scalable fonts and one bitmapped 37Lineprinter font. 38The scalable fonts are available in sizes between 0.25 point and 999.75 39points, in 0.25-point increments; the Lineprinter font is available only 40in 8.5-point size. 41.LP 42The LaserJet font files included with 43.B groff 44assume that all printers since the LaserJet~4 are identical. 45There are some differences between fonts in the earlier and more recent 46printers, however. 47The LaserJet~4 printer used Agfa Intellifont technology for 35 of the 48internal scalable fonts; the remaining 10 scalable fonts were TrueType. 49Beginning with the LaserJet~4000\(enseries printers introduced in 1997, 50all scalable internal fonts have been TrueType. 51The number of printable glyphs differs slightly between Intellifont and 52TrueType fonts (generally, the TrueType fonts include more glyphs), and 53there are some minor differences in glyph metrics. 54Differences among printer models are described in the 55.I "PCL~5 Comparison Guide" 56and the 57.I "PCL~5 Comparison Guide Addendum" 58(for printers introduced since approximately 2001). 59.LP 60LaserJet printers reference a glyph by a combination of a 256-glyph 61symbol set and an index within that symbol set. 62Many glyphs appear in more than one symbol set; all combinations of 63symbol set and index that reference the same glyph are equivalent. 64For each glyph, 65.BR hpftodit (@MAN1EXT@) 66searches a list of symbol sets, and selects the first set that contains 67the glyph. 68The printing code generated by 69.BR hpftodit (@MAN1EXT@) 70is an integer that encodes a numerical value for the symbol set in the 71high byte(s), and the index in the low byte. 72See 73.BR groff_font (@MAN5EXT@) 74for a complete description of the font file format; symbol sets are 75described in greater detail in the 76.IR "PCL~5 Printer Language Technical Reference Manual" . 77.LP 78Two of the scalable fonts, Symbol and Wingdings, are bound to 79256-glyph symbol sets; the remaining scalable fonts, as well as the 80Lineprinter font, support numerous symbol sets, sufficient to enable 81printing of more than 600 glyphs. 82.LP 83The metrics generated by 84.BR hpftodit (@MAN1EXT@) 85assume that the DESC file contains values of 1200 for res and 6350 for 86unitwidth (or any combination (e.g., 2400 and 3175) for which 87res~\(mu~unitwidth~=~7\|620\|000). 88Although HP PCL~5 LaserJet printers support an internal resolution of 897200 units per inch, they use a 16-bit signed integer for cursor 90positioning; if 91.B devlj4 92is to support U.S. ledger paper (11\(sd~\(mu~17\(sd), the maximum usable 93resolution is 32\|767~/~17, or 1927, units per inch, which rounds down to 941200 units per inch. 95If the largest required paper size is less (e.g., 8.5\(sd~\(mu~11\(sd or 96A5), a greater resolution (and lesser unitwidth) can be specified. 97.\" -------------------------------------------------------------------------- 98.SH LIMITATIONS 99.\" -------------------------------------------------------------------------- 100Font metrics for Intellifont fonts were provided by Tagged Font Metric 101(TFM) files originally developed by Agfa/Compugraphic. 102The TFM files provided for these fonts supported 600+ glyphs and 103contained extensive lists of kern pairs. 104.LP 105To accommodate developers who had become accustomed to TFM files, HP also 106provided TFM files for the 10 TrueType fonts included in the LaserJet~4. 107The TFM files for TrueType fonts generally included less information 108than the Intellifont TFMs, supporting fewer glyphs, and in most cases, 109providing no kerning information. 110By the time the LaserJet~4000 printer was introduced, most 111developers had migrated to other means of obtaining font metrics, 112and support for new TFM files was very limited. 113The TFM files provided for the TrueType fonts in the LaserJet~4000 114support only the Latin 2 (ISO 8859-2) symbol set, and include no kerning 115information; consequently, they are of little value for any but the most 116rudimentary documents. 117.LP 118Because the Intellifont TFM files contain considerably more information, 119they generally are preferable to the TrueType TFM files even for use 120with the TrueType fonts in the newer printers. 121The metrics for the TrueType fonts are very close, though not identical, 122to those for the earlier Intellifont fonts of the same names. 123Although most output using the Intellifont metrics with the newer 124printers is quite acceptable, a few glyphs may fail to print as 125expected. 126The differences in glyph metrics may be particularly noticeable with 127composite parentheses, brackets, and braces used by 128.BR eqn (@MAN1EXT@) . 129A script, located in 130.BR @FONTDIR@/devlj4/generate , 131can be used to adjust the metrics for these glyphs in the special font S 132for use with printers that have all TrueType fonts. 133.LP 134At the time HP last supported TFM files, only Version 1 of the Unicode 135standard was available. 136Consequently, many glyphs lacking assigned code points were assigned by 137HP to the Private Use Area (PUA). 138Later versions of the Unicode standard included code points outside the 139PUA for many of these glyphs. 140The HP-supplied TrueType TFM files use the PUA assignments; 141TFM files generated from more recent TrueType font files require the 142later Unicode values to access the same glyphs. 143Consequently, two different mapping files may be required: one for the 144HP-supplied TFM files, and one for more recent TFM files. 145.\" -------------------------------------------------------------------------- 146.SH FILES 147.\" -------------------------------------------------------------------------- 148.Tp \w'\fB@FONTDIR@/devlj4/DESC'u+2n 149.B @FONTDIR@/devlj4/DESC 150Device description file. 151.TP 152.BI @FONTDIR@/devlj4/ F 153Font description file for font 154.IR F . 155.\" -------------------------------------------------------------------------- 156.SH "SEE ALSO" 157.\" -------------------------------------------------------------------------- 158.ad 0 159.BR groff (@MAN1EXT@), 160.BR groff_diff (@MAN1EXT@), 161.BR hpftodit (@MAN1EXT@), 162.BR grolj4 (@MAN1EXT@), 163.BR groff_font (@MAN5EXT@) 164. 165.\" Local Variables: 166.\" mode: nroff 167.\" End: 168