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"
15 #include <freetype/tttables.h>
17 #include "dimensions.hh"
18 #include "modified-font-metric.hh"
22 load_table (char const *tag_str, FT_Face face, FT_ULong *length)
25 FT_ULong tag = FT_MAKE_TAG (tag_str[0], tag_str[1], tag_str[2], tag_str[3]);
27 int error_code = FT_Load_Sfnt_Table (face, tag, 0, NULL, length);
30 FT_Byte *buffer = (FT_Byte *) malloc (*length);
32 error (_f ("can't allocate %d bytes", *length));
34 error_code = FT_Load_Sfnt_Table (face, tag, 0, buffer, length);
36 error (_f ("can't load font table: %s", tag_str));
41 programming_error ("Cannot find OpenType table.");
47 Open_type_font::get_otf_table (String tag) const
49 return ::get_otf_table (face_, tag);
53 load_scheme_table (char const *tag_str, FT_Face face)
56 FT_Byte *buffer = load_table (tag_str, face, &length);
61 String contents ((Byte const *)buffer, length);
62 contents = "(quote (" + contents + "))";
64 tab = scm_c_eval_string (contents.to_str0 ());
71 make_index_to_charcode_map (FT_Face face)
73 Index_to_charcode_map m;
77 for (charcode = FT_Get_First_Char (face, &gindex); gindex != 0;
78 charcode = FT_Get_Next_Char (face, charcode, &gindex))
83 Open_type_font::~Open_type_font ()
92 get_otf_table (FT_Face face, String tag)
95 FT_Byte *tab = load_table (tag.to_str0 (), face, &len);
97 return String (tab, len);
101 open_ft_face (String str)
104 int error_code = FT_New_Face (freetype2_library, str.to_str0 (), 0, &face);
106 if (error_code == FT_Err_Unknown_File_Format)
107 error (_f ("unsupported font format: %s", str.to_str0 ()));
109 error (_f ("unknown error: %d reading font file: %s", error_code,
115 Open_type_font::make_otf (String str)
117 FT_Face face = open_ft_face (str);
118 Open_type_font *otf = new Open_type_font (face);
120 return otf->self_scm ();
123 Open_type_font::Open_type_font (FT_Face face)
126 lily_character_table_ = SCM_EOL;
127 lily_global_table_ = SCM_EOL;
128 lily_subfonts_ = SCM_EOL;
129 lily_index_to_bbox_table_ = SCM_EOL;
131 lily_character_table_ = alist_to_hashq (load_scheme_table ("LILC", face_));
132 lily_global_table_ = alist_to_hashq (load_scheme_table ("LILY", face_));
133 lily_subfonts_ = load_scheme_table ("LILF", face_);
134 index_to_charcode_map_ = make_index_to_charcode_map (face_);
136 lily_index_to_bbox_table_ = scm_c_make_hash_table (257);
140 Open_type_font::derived_mark () const
142 scm_gc_mark (lily_character_table_);
143 scm_gc_mark (lily_global_table_);
144 scm_gc_mark (lily_subfonts_);
145 scm_gc_mark (lily_index_to_bbox_table_);
149 Open_type_font::attachment_point (String glyph_name) const
151 SCM sym = ly_symbol2scm (glyph_name.to_str0 ());
152 SCM entry = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
155 if (entry == SCM_BOOL_F)
158 SCM char_alist = entry;
159 SCM att_scm = scm_cdr (scm_assq (ly_symbol2scm ("attachment"), char_alist));
161 return point_constant * ly_scm2offset (att_scm);
165 Open_type_font::get_indexed_char (int signed_idx) const
167 if (SCM_HASHTABLE_P (lily_index_to_bbox_table_))
169 SCM box = scm_hashq_ref (lily_index_to_bbox_table_, scm_from_int (signed_idx), SCM_BOOL_F);
170 Box *box_ptr = Box::unsmob (box);
175 if (SCM_HASHTABLE_P (lily_character_table_))
179 int code = FT_Get_Glyph_Name (face_, signed_idx, name, len);
181 warning (_f ("FT_Get_Glyph_Name() returned error: %d", code));
183 SCM sym = ly_symbol2scm (name);
184 SCM alist = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
186 if (alist != SCM_BOOL_F)
188 SCM bbox = scm_cdr (scm_assq (ly_symbol2scm ("bbox"), alist));
191 b[X_AXIS][LEFT] = scm_to_double (scm_car (bbox));
192 bbox = scm_cdr (bbox);
193 b[Y_AXIS][LEFT] = scm_to_double (scm_car (bbox));
194 bbox = scm_cdr (bbox);
195 b[X_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
196 bbox = scm_cdr (bbox);
197 b[Y_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
198 bbox = scm_cdr (bbox);
200 b.scale (point_constant);
202 scm_hashq_set_x (lily_index_to_bbox_table_,
203 scm_from_int (signed_idx),
209 FT_UInt idx = signed_idx;
210 FT_Load_Glyph (face_,
214 FT_Glyph_Metrics m = face_->glyph->metrics;
215 int hb = m.horiBearingX;
216 int vb = m.horiBearingY;
217 Box b (Interval (-hb, m.width - hb),
218 Interval (-vb, m.height - vb));
220 b.scale (design_size () / Real (face_->units_per_EM));
225 Open_type_font::name_to_index (String nm) const
227 char *nm_str = (char *) nm.to_str0 ();
228 if (int idx = FT_Get_Name_Index (face_, nm_str))
234 Open_type_font::index_to_charcode (int i) const
236 return ((Open_type_font *) this)->index_to_charcode_map_[i];
240 Open_type_font::count () const
242 return ((Open_type_font *) this)->index_to_charcode_map_.size ();
246 Open_type_font::design_size () const
248 SCM entry = scm_hashq_ref (lily_global_table_,
249 ly_symbol2scm ("design_size"),
252 Hmm. Design size is arbitrary for
253 non-design-size fonts. I vote for 1 -
254 which will trip errors more
258 return scm_to_double (entry) * Real (point_constant);
262 Open_type_font::sub_fonts () const
264 return lily_subfonts_;
268 Open_type_font::get_char_table () const
270 return lily_character_table_;
274 Open_type_font::get_subfonts () const
276 return lily_subfonts_;
280 Open_type_font::get_global_table () const
282 return lily_global_table_;
286 Open_type_font::font_name () const
288 return FT_Get_Postscript_Name (face_);