2 tfm.hh -- declare Tex_font_metric
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2004 Jan Nieuwenhuizen <janneke@gnu.org>
9 revamped code from GNU Fontutils-0.6
14 TODO: aren't there standard libs? Ideally it is better to just link
22 #include "lily-proto.hh"
23 #include "font-metric.hh"
28 /* A character code. Perhaps someday we will allow for 16-bit
29 character codes, but for now we are restricted to 256 characters per
30 font (like TeX and PostScript). */
31 typedef unsigned char Char_code;
33 /* Used in file formats. */
34 typedef int Byte_count;
36 /* The restriction to 256 characters in a TFM file is part of the file
37 format, so this number should only be changed in the (very unlikely)
38 event that the file format changes. */
41 /* Fontwide information. All real values are in printer's points:
42 72.27 points = 1 inch. */
44 /* TFM_MIN_DESIGNSIZE <= designsize < TFM_MAX_DESIGNSIZE. */
45 #define TFM_MIN_DESIGNSIZE 1.0
46 #define TFM_MAX_DESIGNSIZE 2048
48 /* The maximum number of global font parameters we allow. */
49 #define TFM_MAX_FONTDIMENS 30
51 /* The maximum length of a codingscheme string. */
52 #define TFM_MAX_CODINGSCHEME_LENGTH 39
54 /* Define symbolic names for the numbers of the parameters we
55 recognize. Some numbers have more than one name. */
56 #define TFM_SLANT_PARAMETER 1
57 #define TFM_SPACE_PARAMETER 2
58 #define TFM_STRETCH_PARAMETER 3
59 #define TFM_SHRINK_PARAMETER 4
60 #define TFM_XHEIGHT_PARAMETER 5
61 #define TFM_QUAD_PARAMETER 6
62 #define TFM_EXTRASPACE_PARAMETER 7
63 #define TFM_NUM1_PARAMETER 8
64 #define TFM_NUM2_PARAMETER 9
65 #define TFM_NUM3_PARAMETER 10
66 #define TFM_DENOM1_PARAMETER 11
67 #define TFM_DENOM2_PARAMETER 12
68 #define TFM_SUP1_PARAMETER 13
69 #define TFM_SUP2_PARAMETER 14
70 #define TFM_SUP3_PARAMETER 15
71 #define TFM_SUB1_PARAMETER 16
72 #define TFM_SUB2_PARAMETER 17
73 #define TFM_SUPDROP_PARAMETER 18
74 #define TFM_SUBDROP_PARAMETER 19
75 #define TFM_DELIM1_PARAMETER 20
76 #define TFM_DELIM2_PARAMETER 21
77 #define TFM_AXISHEIGHT_PARAMETER 22
78 #define TFM_DEFAULTRULETHICKNESS_PARAMETER 8
79 #define TFM_BIGOPSPACING1_PARAMETER 9
80 #define TFM_BIGOPSPACING2_PARAMETER 10
81 #define TFM_BIGOPSPACING3_PARAMETER 11
82 #define TFM_BIGOPSPACING4_PARAMETER 12
83 #define TFM_BIGOPSPACING5_PARAMETER 13
85 /* These are not in any of the standard TeX fonts, but the information
86 is useful nevertheless. */
87 #define TFM_LEADINGHEIGHT_PARAMETER 23
88 #define TFM_LEADINGDEPTH_PARAMETER 24
89 #define TFM_FONTSIZE_PARAMETER 25
90 #define TFM_VERSION_PARAMETER 26
94 Byte_count char_info_pos;
96 Byte_count height_pos;
98 Byte_count italic_correction_pos;
99 Byte_count lig_kern_pos;
101 unsigned param_word_count;
106 Char_code first_charcode, last_charcode;
109 String coding_scheme;
110 unsigned parameter_count;
111 // Real parameters [Tex_font_metric::MAX_FONTDIMENS];
112 Real parameters [TFM_MAX_FONTDIMENS];
115 /* When typesetting, the current character + `character' leads to
116 `ligature'. The TFM format was extended in 1990 to allow for more
117 complicated ligatures than this, but we do not make those
125 /* Similarly for kerns. */
132 struct Tex_font_char_metric
136 Real width_, height_, depth_, italic_correction_;
137 Fix width_fix_, height_fix_, depth_fix_, italic_correction_fix_;
138 Array<Tfm_kern> kerns_;
139 Array<Tfm_ligature> ligatures_;
141 Tex_font_char_metric ();
143 Box dimensions () const;
147 class Tex_font_metric : public Simple_font_metric
150 static SCM make_tfm (String filename);
152 virtual int count () const;
153 virtual Box get_ascii_char (int) const;
154 virtual Real design_size () const;
155 virtual String coding_scheme () const;
156 virtual void derived_mark () const;
157 virtual int name_to_index (String) const;
162 Array<Tex_font_char_metric> char_metrics_;
163 Array<int> ascii_to_metric_idx_;
167 Tex_font_char_metric const *find_ascii (int ascii, bool warn=true) const;