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)
22 FT_ULong tag = FT_MAKE_TAG (tag_str[0], tag_str[1], tag_str[2], tag_str[3]);
24 int error_code = FT_Load_Sfnt_Table (face, tag, 0, NULL, length);
27 FT_Byte *buffer = (FT_Byte *) malloc (*length);
29 error (_f ("can't allocate %d bytes", *length));
31 error_code = FT_Load_Sfnt_Table (face, tag, 0, buffer, length);
33 error (_f ("can't load font table: %s", tag_str));
39 programming_error ("Cannot find OpenType table.");
46 Open_type_font::get_otf_table (String tag) const
49 FT_Byte *tab = load_table (tag.to_str0 (), face_, &len);
51 return String (tab, len);
55 load_scheme_table (char const *tag_str, FT_Face face)
58 FT_Byte *buffer = load_table (tag_str, face, &length);
63 String contents ((Byte const *)buffer, length);
64 contents = "(quote (" + contents + "))";
66 tab = scm_c_eval_string (contents.to_str0 ());
73 make_index_to_charcode_map (FT_Face face)
75 Index_to_charcode_map m;
79 for (charcode = FT_Get_First_Char (face, &gindex); gindex != 0;
80 charcode = FT_Get_Next_Char (face, charcode, &gindex))
85 Open_type_font::~Open_type_font ()
91 Open_type_font::make_otf (String str)
94 int error_code = FT_New_Face (freetype2_library, str.to_str0 (), 0, &face);
96 if (error_code == FT_Err_Unknown_File_Format)
97 error (_f ("unsupported font format: %s", str.to_str0 ()));
99 error (_f ("unknown error: %d reading font file: %s", error_code,
102 Open_type_font *otf = new Open_type_font (face);
104 return otf->self_scm ();
107 Open_type_font::Open_type_font (FT_Face face)
110 lily_character_table_ = SCM_EOL;
111 lily_global_table_ = SCM_EOL;
112 lily_subfonts_ = SCM_EOL;
114 lily_character_table_ = alist_to_hashq (load_scheme_table ("LILC", face_));
115 lily_global_table_ = alist_to_hashq (load_scheme_table ("LILY", face_));
116 lily_subfonts_ = load_scheme_table ("LILF", face_);
117 index_to_charcode_map_ = make_index_to_charcode_map (face_);
121 Open_type_font::derived_mark () const
123 scm_gc_mark (lily_character_table_);
124 scm_gc_mark (lily_global_table_);
125 scm_gc_mark (lily_subfonts_);
129 Open_type_font::attachment_point (String glyph_name) const
131 SCM sym = ly_symbol2scm (glyph_name.to_str0 ());
132 SCM entry = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
135 if (entry == SCM_BOOL_F)
138 SCM char_alist = entry;
139 SCM att_scm = scm_cdr (scm_assq (ly_symbol2scm ("attachment"), char_alist));
141 return point_constant * ly_scm2offset (att_scm);
145 Open_type_font::get_indexed_char (int signed_idx) const
147 if (SCM_HASHTABLE_P (lily_character_table_))
151 int code = FT_Get_Glyph_Name (face_, signed_idx, name, len);
153 warning (_f ("FT_Get_Glyph_Name() returned error: %d", code));
155 SCM sym = ly_symbol2scm (name);
156 SCM alist = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
158 if (alist != SCM_BOOL_F)
160 SCM bbox = scm_cdr (scm_assq (ly_symbol2scm ("bbox"), alist));
163 b[X_AXIS][LEFT] = scm_to_double (scm_car (bbox));
164 bbox = scm_cdr (bbox);
165 b[Y_AXIS][LEFT] = scm_to_double (scm_car (bbox));
166 bbox = scm_cdr (bbox);
167 b[X_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
168 bbox = scm_cdr (bbox);
169 b[Y_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
170 bbox = scm_cdr (bbox);
172 b.scale (point_constant);
177 FT_UInt idx = signed_idx;
178 FT_Load_Glyph (face_,
182 FT_Glyph_Metrics m = face_->glyph->metrics;
183 int hb = m.horiBearingX;
184 int vb = m.horiBearingY;
185 Box b (Interval (-hb, m.width - hb),
186 Interval (-vb, m.height - vb));
188 b.scale (design_size () / Real (face_->units_per_EM));
193 Open_type_font::name_to_index (String nm) const
195 char *nm_str = (char *) nm.to_str0 ();
196 if (int idx = FT_Get_Name_Index (face_, nm_str))
202 Open_type_font::index_to_charcode (int i) const
204 return ((Open_type_font *) this)->index_to_charcode_map_[i];
208 Open_type_font::count () const
210 return ((Open_type_font *) this)->index_to_charcode_map_.size ();
214 Open_type_font::design_size () const
216 SCM entry = scm_hashq_ref (lily_global_table_,
217 ly_symbol2scm ("design_size"),
220 Hmm. Design size is arbitrary for
221 non-design-size fonts. I vote for 1 -
222 which will trip errors more
226 return scm_to_double (entry) * Real (point_constant);
230 Open_type_font::sub_fonts () const
232 return lily_subfonts_;
236 Open_type_font::get_char_table () const
238 return lily_character_table_;
242 Open_type_font::get_subfonts () const
244 return lily_subfonts_;
248 Open_type_font::get_global_table () const
250 return lily_global_table_;
254 Open_type_font::font_name () const
256 return FT_Get_Postscript_Name (face_);