2 open-type-font.cc -- implement Open_type_font
4 source file of the GNU LilyPond music typesetter
6 (c) 2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
12 #include <freetype/tttables.h>
15 #include "open-type-font.hh"
16 #include "dimensions.hh"
17 #include "modified-font-metric.hh"
19 const Real point_constant = 1 PT;
22 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 ("Cannot allocate %d bytes", *length));
33 error_code = FT_Load_Sfnt_Table (face, tag, 0, buffer, length );
35 error (_f ("Could not load %s font table", tag_str));
44 load_scheme_table (char const *tag_str, FT_Face face)
47 FT_Byte *buffer = load_table (tag_str, face, &length);
52 String contents ((Byte const*)buffer, length);
53 contents = "(quote (" + contents + "))";
55 tab = scm_c_eval_string (contents.to_str0 ());
62 make_index_to_charcode_map (FT_Face face)
64 Index_to_charcode_map m;
68 for (charcode = FT_Get_First_Char (face, &gindex); gindex != 0;
69 charcode = FT_Get_Next_Char (face, charcode, &gindex))
74 Open_type_font::~Open_type_font()
80 Open_type_font::make_otf (String str)
83 int error_code = FT_New_Face(freetype2_library, str.to_str0 (), 0, &face);
85 if (error_code == FT_Err_Unknown_File_Format)
87 error (_f ("Unsupported font format: %s", str.to_str0 ()));
91 error (_f ("Unknown error: %d reading font file: %s", error_code,
95 Open_type_font *otf = new Open_type_font (face);
97 return otf->self_scm ();
100 Open_type_font::Open_type_font (FT_Face face)
103 lily_character_table_ = SCM_EOL;
104 lily_global_table_ = SCM_EOL;
105 lily_subfonts_ = SCM_EOL;
107 lily_character_table_ = alist_to_hashq (load_scheme_table ("LILC", face_));
108 lily_global_table_ = alist_to_hashq (load_scheme_table ("LILY", face_));
109 lily_subfonts_ = load_scheme_table ("LILF", face_);
110 index_to_charcode_map_ = make_index_to_charcode_map (face_);
114 Open_type_font::derived_mark () const
116 scm_gc_mark (lily_character_table_);
117 scm_gc_mark (lily_global_table_);
118 scm_gc_mark (lily_subfonts_);
122 Open_type_font::attachment_point (String glyph_name) const
124 SCM sym = ly_symbol2scm (glyph_name.to_str0 ());
125 SCM entry = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
128 if (entry == SCM_BOOL_F)
131 SCM char_alist = entry;
132 SCM att_scm = scm_cdr (scm_assq (ly_symbol2scm ("attachment"), char_alist));
134 return point_constant * ly_scm2offset (att_scm);
138 Open_type_font::get_indexed_char (int signed_idx) const
140 if (SCM_HASHTABLE_P (lily_character_table_))
144 int code = FT_Get_Glyph_Name (face_, signed_idx, name, len);
146 warning (_f ("FT_Get_Glyph_Name() returned error: %d", code));
148 SCM sym = ly_symbol2scm (name);
149 SCM alist = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
151 if (alist != SCM_BOOL_F)
153 SCM bbox = scm_cdr (scm_assq (ly_symbol2scm ("bbox"), alist));
156 b[X_AXIS][LEFT] = scm_to_double (scm_car (bbox));
157 bbox = scm_cdr (bbox);
158 b[Y_AXIS][LEFT] = scm_to_double (scm_car (bbox));
159 bbox = scm_cdr (bbox);
160 b[X_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
161 bbox = scm_cdr (bbox);
162 b[Y_AXIS][RIGHT] = scm_to_double (scm_car (bbox));
163 bbox = scm_cdr (bbox);
165 b.scale (point_constant);
170 FT_UInt idx = signed_idx;
171 FT_Load_Glyph (face_,
175 FT_Glyph_Metrics m = face_->glyph->metrics;
176 int hb = m.horiBearingX;
177 int vb = m.horiBearingY;
178 Box b (Interval (-hb, m.width - hb),
179 Interval (-vb, m.height - vb));
181 b.scale (design_size () * Real (point_constant) / face_->units_per_EM);
186 Open_type_font::name_to_index (String nm) const
188 char *nm_str = (char*) nm.to_str0 ();
189 if (int idx = FT_Get_Name_Index (face_, nm_str))
195 Open_type_font::index_to_charcode (int i) const
197 return ((Open_type_font*) this)->index_to_charcode_map_[i];
201 Open_type_font::count () const
203 return ((Open_type_font*) this)->index_to_charcode_map_.size ();
207 Open_type_font::design_size () const
209 SCM entry = scm_hashq_ref (lily_global_table_,
210 ly_symbol2scm ("design_size"),
213 Hmm. Design size is arbitrary for
214 non-design-size fonts. I vote for 1 -
215 which will trip errors more
219 return scm_to_double (entry);
224 Open_type_font::sub_fonts () const
226 return lily_subfonts_;
229 LY_DEFINE (ly_font_sub_fonts, "ly:font-sub-fonts", 1, 0, 0,
231 "Given the font metric @var{font} of an OpenType font, return the "
232 "names of the subfonts within @var{font}.")
234 Font_metric *fm = unsmob_metrics (font);
235 SCM_ASSERT_TYPE (fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
236 return fm->sub_fonts ();
239 LY_DEFINE (ly_otf_font_glyph_info, "ly:otf-font-glyph-info", 2, 0, 0,
240 (SCM font, SCM glyph),
241 "Given the font metric @var{font} of an OpenType font, return the "
242 "information about named glyph @var{glyph} (a string)")
244 Modified_font_metric * fm
245 = dynamic_cast<Modified_font_metric*> (unsmob_metrics (font));
246 Open_type_font * otf = dynamic_cast<Open_type_font*> (fm->original_font ());
247 SCM_ASSERT_TYPE (otf, font, SCM_ARG1, __FUNCTION__, "OTF font-metric");
248 SCM_ASSERT_TYPE (scm_is_string (glyph), glyph, SCM_ARG1,
249 __FUNCTION__, "string");
251 SCM sym = scm_string_to_symbol (glyph);
252 return scm_hashq_ref (otf->get_char_table (), sym, SCM_EOL);
256 Open_type_font::get_char_table () const
258 return lily_character_table_;
262 Open_type_font::get_subfonts () const
264 return lily_subfonts_;
268 Open_type_font::get_global_table () const
270 return lily_global_table_;
274 Open_type_font::font_name () const
276 return FT_Get_Postscript_Name (face_);