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"
14 #include <freetype/tttables.h>
16 #include "dimensions.hh"
17 #include "modified-font-metric.hh"
21 load_table (char const *tag_str, FT_Face face, FT_ULong *length)
24 FT_ULong tag = FT_MAKE_TAG (tag_str[0], tag_str[1], tag_str[2], tag_str[3]);
26 int error_code = FT_Load_Sfnt_Table (face, tag, 0, NULL, length);
29 FT_Byte *buffer = (FT_Byte *) malloc (*length);
31 error (_f ("can't allocate %d bytes", *length));
33 error_code = FT_Load_Sfnt_Table (face, tag, 0, buffer, length);
35 error (_f ("can't load font table: %s", tag_str));
40 programming_error ("Cannot find OpenType table.");
46 Open_type_font::get_otf_table (String tag) const
48 return ::get_otf_table (face_, tag);
52 load_scheme_table (char const *tag_str, FT_Face face)
55 FT_Byte *buffer = load_table (tag_str, face, &length);
60 String contents ((Byte const *)buffer, length);
61 contents = "(quote (" + contents + "))";
63 tab = scm_c_eval_string (contents.to_str0 ());
70 make_index_to_charcode_map (FT_Face face)
72 Index_to_charcode_map m;
76 for (charcode = FT_Get_First_Char (face, &gindex); gindex != 0;
77 charcode = FT_Get_Next_Char (face, charcode, &gindex))
82 Open_type_font::~Open_type_font ()
91 get_otf_table (FT_Face face, String tag)
94 FT_Byte *tab = load_table (tag.to_str0 (), face, &len);
96 return String (tab, len);
100 open_ft_face (String str)
103 int error_code = FT_New_Face (freetype2_library, str.to_str0 (), 0, &face);
105 if (error_code == FT_Err_Unknown_File_Format)
106 error (_f ("unsupported font format: %s", str.to_str0 ()));
108 error (_f ("unknown error: %d reading font file: %s", error_code,
114 Open_type_font::make_otf (String str)
116 FT_Face face = open_ft_face (str);
117 Open_type_font *otf = new Open_type_font (face);
119 return otf->self_scm ();
122 Open_type_font::Open_type_font (FT_Face face)
125 lily_character_table_ = SCM_EOL;
126 lily_global_table_ = SCM_EOL;
127 lily_subfonts_ = SCM_EOL;
128 lily_index_to_bbox_table_ = SCM_EOL;
130 lily_character_table_ = alist_to_hashq (load_scheme_table ("LILC", face_));
131 lily_global_table_ = alist_to_hashq (load_scheme_table ("LILY", face_));
132 lily_subfonts_ = load_scheme_table ("LILF", face_);
133 index_to_charcode_map_ = make_index_to_charcode_map (face_);
135 lily_index_to_bbox_table_ = scm_c_make_hash_table (257);
139 Open_type_font::derived_mark () const
141 scm_gc_mark (lily_character_table_);
142 scm_gc_mark (lily_global_table_);
143 scm_gc_mark (lily_subfonts_);
144 scm_gc_mark (lily_index_to_bbox_table_);
148 Open_type_font::attachment_point (String glyph_name) const
150 SCM sym = ly_symbol2scm (glyph_name.to_str0 ());
151 SCM entry = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
154 if (entry == SCM_BOOL_F)
157 SCM char_alist = entry;
158 SCM att_scm = scm_cdr (scm_assq (ly_symbol2scm ("attachment"), char_alist));
160 return point_constant * ly_scm2offset (att_scm);
164 Open_type_font::get_indexed_char (int signed_idx) const
166 if (SCM_HASHTABLE_P (lily_index_to_bbox_table_))
168 SCM box = scm_hashq_ref (lily_index_to_bbox_table_, scm_from_int (signed_idx), SCM_BOOL_F);
169 Box *box_ptr = Box::unsmob (box);
174 if (SCM_HASHTABLE_P (lily_character_table_))
178 int code = FT_Get_Glyph_Name (face_, signed_idx, name, len);
180 warning (_f ("FT_Get_Glyph_Name() returned error: %d", code));
182 SCM sym = ly_symbol2scm (name);
183 SCM alist = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
185 if (alist != SCM_BOOL_F)
187 SCM bbox = scm_cdr (scm_assq (ly_symbol2scm ("bbox"), alist));
190 b[X_AXIS][LEFT] = scm_to_double (scm_car (bbox));
191 bbox = scm_cdr (bbox);
192 b[Y_AXIS][LEFT] = scm_to_double (scm_car (bbox));
193 bbox = scm_cdr (bbox);
194 b[X_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
195 bbox = scm_cdr (bbox);
196 b[Y_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
197 bbox = scm_cdr (bbox);
199 b.scale (point_constant);
201 scm_hashq_set_x (lily_index_to_bbox_table_,
202 scm_from_int (signed_idx),
208 FT_UInt idx = signed_idx;
209 FT_Load_Glyph (face_,
213 FT_Glyph_Metrics m = face_->glyph->metrics;
214 int hb = m.horiBearingX;
215 int vb = m.horiBearingY;
216 Box b (Interval (-hb, m.width - hb),
217 Interval (-vb, m.height - vb));
219 b.scale (design_size () / Real (face_->units_per_EM));
224 Open_type_font::name_to_index (String nm) const
226 char *nm_str = (char *) nm.to_str0 ();
227 if (int idx = FT_Get_Name_Index (face_, nm_str))
233 Open_type_font::index_to_charcode (int i) const
235 return ((Open_type_font *) this)->index_to_charcode_map_[i];
239 Open_type_font::count () const
241 return ((Open_type_font *) this)->index_to_charcode_map_.size ();
245 Open_type_font::design_size () const
247 SCM entry = scm_hashq_ref (lily_global_table_,
248 ly_symbol2scm ("design_size"),
251 Hmm. Design size is arbitrary for
252 non-design-size fonts. I vote for 1 -
253 which will trip errors more
257 return scm_to_double (entry) * Real (point_constant);
261 Open_type_font::sub_fonts () const
263 return lily_subfonts_;
267 Open_type_font::get_char_table () const
269 return lily_character_table_;
273 Open_type_font::get_subfonts () const
275 return lily_subfonts_;
279 Open_type_font::get_global_table () const
281 return lily_global_table_;
285 Open_type_font::font_name () const
287 return FT_Get_Postscript_Name (face_);