2 open-type-font.cc -- implement Open_type_font
4 source file of the GNU LilyPond music typesetter
6 (c) 2004--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "open-type-font.hh"
11 #include <freetype/tttables.h>
14 #include "dimensions.hh"
15 #include "modified-font-metric.hh"
19 load_table (char const *tag_str, FT_Face face, FT_ULong *length)
21 FT_ULong tag = FT_MAKE_TAG (tag_str[0], tag_str[1], tag_str[2], tag_str[3]);
23 int error_code = FT_Load_Sfnt_Table (face, tag, 0, NULL, length);
26 FT_Byte *buffer = (FT_Byte *) malloc (*length);
28 error (_f ("can't allocate %d bytes", *length));
30 error_code = FT_Load_Sfnt_Table (face, tag, 0, buffer, length);
32 error (_f ("can't load font table: %s", tag_str));
41 load_scheme_table (char const *tag_str, FT_Face face)
44 FT_Byte *buffer = load_table (tag_str, face, &length);
49 String contents ((Byte const *)buffer, length);
50 contents = "(quote (" + contents + "))";
52 tab = scm_c_eval_string (contents.to_str0 ());
59 make_index_to_charcode_map (FT_Face face)
61 Index_to_charcode_map m;
65 for (charcode = FT_Get_First_Char (face, &gindex); gindex != 0;
66 charcode = FT_Get_Next_Char (face, charcode, &gindex))
71 Open_type_font::~Open_type_font ()
77 Open_type_font::make_otf (String str)
80 int error_code = FT_New_Face (freetype2_library, str.to_str0 (), 0, &face);
82 if (error_code == FT_Err_Unknown_File_Format)
83 error (_f ("unsupported font format: %s", str.to_str0 ()));
85 error (_f ("unknown error: %d reading font file: %s", error_code,
88 Open_type_font *otf = new Open_type_font (face);
90 return otf->self_scm ();
93 Open_type_font::Open_type_font (FT_Face face)
96 lily_character_table_ = SCM_EOL;
97 lily_global_table_ = SCM_EOL;
98 lily_subfonts_ = SCM_EOL;
100 lily_character_table_ = alist_to_hashq (load_scheme_table ("LILC", face_));
101 lily_global_table_ = alist_to_hashq (load_scheme_table ("LILY", face_));
102 lily_subfonts_ = load_scheme_table ("LILF", face_);
103 index_to_charcode_map_ = make_index_to_charcode_map (face_);
107 Open_type_font::derived_mark () const
109 scm_gc_mark (lily_character_table_);
110 scm_gc_mark (lily_global_table_);
111 scm_gc_mark (lily_subfonts_);
115 Open_type_font::attachment_point (String glyph_name) const
117 SCM sym = ly_symbol2scm (glyph_name.to_str0 ());
118 SCM entry = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
121 if (entry == SCM_BOOL_F)
124 SCM char_alist = entry;
125 SCM att_scm = scm_cdr (scm_assq (ly_symbol2scm ("attachment"), char_alist));
127 return point_constant * ly_scm2offset (att_scm);
131 Open_type_font::get_indexed_char (int signed_idx) const
133 if (SCM_HASHTABLE_P (lily_character_table_))
137 int code = FT_Get_Glyph_Name (face_, signed_idx, name, len);
139 warning (_f ("FT_Get_Glyph_Name() returned error: %d", code));
141 SCM sym = ly_symbol2scm (name);
142 SCM alist = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
144 if (alist != SCM_BOOL_F)
146 SCM bbox = scm_cdr (scm_assq (ly_symbol2scm ("bbox"), alist));
149 b[X_AXIS][LEFT] = scm_to_double (scm_car (bbox));
150 bbox = scm_cdr (bbox);
151 b[Y_AXIS][LEFT] = scm_to_double (scm_car (bbox));
152 bbox = scm_cdr (bbox);
153 b[X_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
154 bbox = scm_cdr (bbox);
155 b[Y_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
156 bbox = scm_cdr (bbox);
158 b.scale (point_constant);
163 FT_UInt idx = signed_idx;
164 FT_Load_Glyph (face_,
168 FT_Glyph_Metrics m = face_->glyph->metrics;
169 int hb = m.horiBearingX;
170 int vb = m.horiBearingY;
171 Box b (Interval (-hb, m.width - hb),
172 Interval (-vb, m.height - vb));
174 b.scale (design_size () / Real (face_->units_per_EM));
179 Open_type_font::name_to_index (String nm) const
181 char *nm_str = (char *) nm.to_str0 ();
182 if (int idx = FT_Get_Name_Index (face_, nm_str))
188 Open_type_font::index_to_charcode (int i) const
190 return ((Open_type_font *) this)->index_to_charcode_map_[i];
194 Open_type_font::count () const
196 return ((Open_type_font *) this)->index_to_charcode_map_.size ();
200 Open_type_font::design_size () const
202 SCM entry = scm_hashq_ref (lily_global_table_,
203 ly_symbol2scm ("design_size"),
206 Hmm. Design size is arbitrary for
207 non-design-size fonts. I vote for 1 -
208 which will trip errors more
212 return scm_to_double (entry) * Real (point_constant);
216 Open_type_font::sub_fonts () const
218 return lily_subfonts_;
222 Open_type_font::get_char_table () const
224 return lily_character_table_;
228 Open_type_font::get_subfonts () const
230 return lily_subfonts_;
234 Open_type_font::get_global_table () const
236 return lily_global_table_;
240 Open_type_font::font_name () const
242 return FT_Get_Postscript_Name (face_);