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 Open_type_font::get_otf_table (String tag) const
44 FT_Byte *tab = load_table (tag.to_str0 (), face_, &len);
46 return String (tab, len);
50 load_scheme_table (char const *tag_str, FT_Face face)
53 FT_Byte *buffer = load_table (tag_str, face, &length);
58 String contents ((Byte const *)buffer, length);
59 contents = "(quote (" + contents + "))";
61 tab = scm_c_eval_string (contents.to_str0 ());
68 make_index_to_charcode_map (FT_Face face)
70 Index_to_charcode_map m;
74 for (charcode = FT_Get_First_Char (face, &gindex); gindex != 0;
75 charcode = FT_Get_Next_Char (face, charcode, &gindex))
80 Open_type_font::~Open_type_font ()
86 Open_type_font::make_otf (String str)
89 int error_code = FT_New_Face (freetype2_library, str.to_str0 (), 0, &face);
91 if (error_code == FT_Err_Unknown_File_Format)
92 error (_f ("unsupported font format: %s", str.to_str0 ()));
94 error (_f ("unknown error: %d reading font file: %s", error_code,
97 Open_type_font *otf = new Open_type_font (face);
99 return otf->self_scm ();
102 Open_type_font::Open_type_font (FT_Face face)
105 lily_character_table_ = SCM_EOL;
106 lily_global_table_ = SCM_EOL;
107 lily_subfonts_ = SCM_EOL;
109 lily_character_table_ = alist_to_hashq (load_scheme_table ("LILC", face_));
110 lily_global_table_ = alist_to_hashq (load_scheme_table ("LILY", face_));
111 lily_subfonts_ = load_scheme_table ("LILF", face_);
112 index_to_charcode_map_ = make_index_to_charcode_map (face_);
116 Open_type_font::derived_mark () const
118 scm_gc_mark (lily_character_table_);
119 scm_gc_mark (lily_global_table_);
120 scm_gc_mark (lily_subfonts_);
124 Open_type_font::attachment_point (String glyph_name) const
126 SCM sym = ly_symbol2scm (glyph_name.to_str0 ());
127 SCM entry = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
130 if (entry == SCM_BOOL_F)
133 SCM char_alist = entry;
134 SCM att_scm = scm_cdr (scm_assq (ly_symbol2scm ("attachment"), char_alist));
136 return point_constant * ly_scm2offset (att_scm);
140 Open_type_font::get_indexed_char (int signed_idx) const
142 if (SCM_HASHTABLE_P (lily_character_table_))
146 int code = FT_Get_Glyph_Name (face_, signed_idx, name, len);
148 warning (_f ("FT_Get_Glyph_Name() returned error: %d", code));
150 SCM sym = ly_symbol2scm (name);
151 SCM alist = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
153 if (alist != SCM_BOOL_F)
155 SCM bbox = scm_cdr (scm_assq (ly_symbol2scm ("bbox"), alist));
158 b[X_AXIS][LEFT] = scm_to_double (scm_car (bbox));
159 bbox = scm_cdr (bbox);
160 b[Y_AXIS][LEFT] = scm_to_double (scm_car (bbox));
161 bbox = scm_cdr (bbox);
162 b[X_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
163 bbox = scm_cdr (bbox);
164 b[Y_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
165 bbox = scm_cdr (bbox);
167 b.scale (point_constant);
172 FT_UInt idx = signed_idx;
173 FT_Load_Glyph (face_,
177 FT_Glyph_Metrics m = face_->glyph->metrics;
178 int hb = m.horiBearingX;
179 int vb = m.horiBearingY;
180 Box b (Interval (-hb, m.width - hb),
181 Interval (-vb, m.height - vb));
183 b.scale (design_size () / Real (face_->units_per_EM));
188 Open_type_font::name_to_index (String nm) const
190 char *nm_str = (char *) nm.to_str0 ();
191 if (int idx = FT_Get_Name_Index (face_, nm_str))
197 Open_type_font::index_to_charcode (int i) const
199 return ((Open_type_font *) this)->index_to_charcode_map_[i];
203 Open_type_font::count () const
205 return ((Open_type_font *) this)->index_to_charcode_map_.size ();
209 Open_type_font::design_size () const
211 SCM entry = scm_hashq_ref (lily_global_table_,
212 ly_symbol2scm ("design_size"),
215 Hmm. Design size is arbitrary for
216 non-design-size fonts. I vote for 1 -
217 which will trip errors more
221 return scm_to_double (entry) * Real (point_constant);
225 Open_type_font::sub_fonts () const
227 return lily_subfonts_;
231 Open_type_font::get_char_table () const
233 return lily_character_table_;
237 Open_type_font::get_subfonts () const
239 return lily_subfonts_;
243 Open_type_font::get_global_table () const
245 return lily_global_table_;
249 Open_type_font::font_name () const
251 return FT_Get_Postscript_Name (face_);