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>
13 #include <freetype/tttables.h>
16 #include "open-type-font.hh"
17 #include "dimensions.hh"
20 const Real point_constant = 1 PT;
23 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 ("Cannot allocate %d bytes", *length));
34 error_code = FT_Load_Sfnt_Table (face, tag, 0, buffer, length );
37 error (_f ("Could not load %s font table", tag_str));
47 load_scheme_table (char const *tag_str, FT_Face face)
50 FT_Byte *buffer = load_table (tag_str, face, &length);
55 String contents ((Byte const*)buffer, length);
56 contents = "(quote (" + contents + "))";
58 tab = scm_c_eval_string (contents.to_str0 ());
66 make_index_to_charcode_map (FT_Face face)
68 Index_to_charcode_map m;
72 for (charcode = FT_Get_First_Char (face, &gindex); gindex != 0;
73 charcode = FT_Get_Next_Char (face, charcode, &gindex))
79 Glyph_name_to_charcode_map
80 make_glyph_name_to_charcode_map (FT_Face face)
82 Glyph_name_to_charcode_map m;
87 for (charcode = FT_Get_First_Char (face, &gindex); gindex != 0;
88 charcode = FT_Get_Next_Char (face, charcode, &gindex))
90 if (FT_Get_Glyph_Name (face, gindex, buffer, sizeof (buffer) - 1))
92 programming_error ("no glyph name");
95 m[String (buffer)] = charcode;
101 Open_type_font::~Open_type_font()
103 FT_Done_Face (face_);
107 Open_type_font::make_otf (String str)
110 int error_code = FT_New_Face(freetype2_library, str.to_str0 (), 0, &face);
112 if (error_code == FT_Err_Unknown_File_Format)
114 error (_f ("Unsupported font format: %s", str.to_str0 ()));
118 error (_f ("Unknown error: %d reading font file: %s", error_code,
122 Open_type_font *otf = new Open_type_font (face);
124 return otf->self_scm ();
128 Open_type_font::Open_type_font (FT_Face face)
131 lily_character_table_ = SCM_EOL;
132 lily_global_table_ = SCM_EOL;
133 lily_subfonts_ = SCM_EOL;
135 lily_character_table_ = alist_to_hashq (load_scheme_table ("LILC", face_));
136 lily_global_table_ = alist_to_hashq (load_scheme_table ("LILY", face_));
137 lily_subfonts_ = load_scheme_table ("LILF", face_);
138 index_to_charcode_map_ = make_index_to_charcode_map (face_);
140 //glyph_name_to_charcode_map_ = make_glyph_name_to_charcode_map (face_);
144 Open_type_font::derived_mark () const
146 scm_gc_mark (lily_character_table_);
147 scm_gc_mark (lily_global_table_);
148 scm_gc_mark (lily_subfonts_);
152 Open_type_font::attachment_point (String glyph_name) const
154 SCM sym = ly_symbol2scm (glyph_name.to_str0 ());
155 SCM entry = scm_hashq_ref (lily_character_table_, sym, SCM_BOOL_F);
158 if (entry == SCM_BOOL_F)
161 SCM char_alist = entry;
164 SCM att_scm = scm_cdr (scm_assq (ly_symbol2scm ("attachment"), char_alist));
166 return point_constant * ly_scm2offset (att_scm);
170 Open_type_font::get_indexed_char (int signed_idx) const
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 (point_constant) / 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];
204 Open_type_font::glyph_name_to_charcode (String glyph_name) const
206 return ((Open_type_font*) this)->glyph_name_to_charcode_map_[glyph_name];
211 Open_type_font::design_size () const
213 SCM entry = scm_hashq_ref (lily_global_table_,
214 ly_symbol2scm ("staffsize"),
216 return scm_to_double (entry);
221 Open_type_font::sub_fonts () const
223 return lily_subfonts_;
226 LY_DEFINE (ly_font_sub_fonts, "ly:font-sub-fonts", 1, 0, 0,
228 "Given the font metric @var{font} of an OpenType font, return the "
229 "names of the subfonts within @var{font}.")
231 Font_metric *fm = unsmob_metrics (font);
232 SCM_ASSERT_TYPE (fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
233 return fm->sub_fonts ();