lily/pango-font.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2004--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #define PANGO_ENABLE_BACKEND // ugh, why necessary?
  21 #include <pango/pangoft2.h>
  22 #include <freetype/ftxf86.h>
  23
  24 #include <map>
  25 #include <cstdio>
  26
  27 // Ugh.
  28
  29 #include "pango-font.hh"
  30 #include "dimensions.hh"
  31 #include "file-name.hh"
  32 #include "international.hh"
  33 #include "lookup.hh"            // debugging
  34 #include "main.hh"
  35 #include "string-convert.hh"
  36 #include "warn.hh"
  37 #include "all-font-metrics.hh"
  38 #include "program-option.hh"
  39
  40 #if HAVE_PANGO_FT2
  41 #include "stencil.hh"
  42
  43 Pango_font::Pango_font (PangoFT2FontMap * /* fontmap */,
  44                         PangoFontDescription const *description,
  45                         Real output_scale)
  46 {
  47   physical_font_tab_ = scm_c_make_hash_table (11);
  48   PangoDirection pango_dir = PANGO_DIRECTION_LTR;
  49   context_ = pango_ft2_get_context (PANGO_RESOLUTION,
  50                                     PANGO_RESOLUTION);
  51
  52   pango_description_ = pango_font_description_copy (description);
  53   attribute_list_ = pango_attr_list_new ();
  54
  55   // urgh. I don't understand this. Why isn't this 1/(scale *
  56   // resolution * output_scale)
  57   //
  58   //  --hwn
  59   output_scale_ = output_scale;
  60   scale_ = INCH_TO_BP
  61            / (Real (PANGO_SCALE) * Real (PANGO_RESOLUTION) * output_scale);
  62
  63   // ugh. Should make this configurable.
  64   pango_context_set_language (context_, pango_language_from_string ("en_US"));
  65   pango_context_set_base_dir (context_, pango_dir);
  66   pango_context_set_font_description (context_, description);
  67 }
  68
  69 Pango_font::~Pango_font ()
  70 {
  71   pango_font_description_free (pango_description_);
  72   g_object_unref (context_);
  73   pango_attr_list_unref (attribute_list_);
  74 }
  75
  76 void
  77 Pango_font::register_font_file (string filename,
  78                                 string ps_name,
  79                                 int face_index)
  80 {
  81   scm_hash_set_x (physical_font_tab_,
  82                   ly_string2scm (ps_name),
  83                   scm_list_2 (ly_string2scm (filename),
  84                               scm_from_int (face_index)));
  85 }
  86
  87 void
  88 Pango_font::derived_mark () const
  89 {
  90   scm_gc_mark (physical_font_tab_);
  91 }
  92
  93 void
  94 get_glyph_index_name (char *s,
  95                       FT_ULong code)
  96 {
  97   sprintf (s, "glyphIndex%lX", code);
  98 }
  99
 100 void
 101 get_unicode_name (char *s,
 102                   FT_ULong code)
 103 {
 104   if (code > 0xFFFF)
 105     sprintf (s, "u%lX", code);
 106   else
 107     sprintf (s, "uni%04lX", code);
 108 }
 109
 110 Stencil
 111 Pango_font::pango_item_string_stencil (PangoItem const *item,
 112                                        string str,
 113                                        bool tight_bbox) const
 114 {
 115   const int GLYPH_NAME_LEN = 256;
 116   char glyph_name[GLYPH_NAME_LEN];
 117   PangoAnalysis const *pa = &(item->analysis);
 118   PangoGlyphString *pgs = pango_glyph_string_new ();
 119
 120   pango_shape (str.c_str () + item->offset,
 121                item->length, (PangoAnalysis*) pa, pgs);
 122
 123   PangoRectangle logical_rect;
 124   PangoRectangle ink_rect;
 125   pango_glyph_string_extents (pgs, pa->font, &ink_rect, &logical_rect);
 126
 127   PangoFcFont *fcfont = G_TYPE_CHECK_INSTANCE_CAST (pa->font,
 128                                                     PANGO_TYPE_FC_FONT,
 129                                                     PangoFcFont);
 130
 131   FT_Face ftface = pango_fc_font_lock_face (fcfont);
 132
 133   PangoRectangle const *which_rect = tight_bbox ? &ink_rect
 134                                                 : &logical_rect;
 135
 136   Box b (Interval (PANGO_LBEARING (logical_rect),
 137                    PANGO_RBEARING (logical_rect)),
 138          Interval (-PANGO_DESCENT (*which_rect),
 139                    PANGO_ASCENT (*which_rect)));
 140   b.scale (scale_);
 141
 142   char const *ps_name_str0 = FT_Get_Postscript_Name (ftface);
 143   FcPattern *fcpat = fcfont->font_pattern;
 144
 145   FcChar8 *file_name_as_ptr = 0;
 146   FcPatternGetString (fcpat, FC_FILE, 0, &file_name_as_ptr);
 147
 148   // due to a bug in FreeType 2.3.7 and earlier we can't use
 149   // ftface->face_index; it is always zero for some font formats,
 150   // in particular TTCs which we are interested in
 151   int face_index = 0;
 152   FcPatternGetInteger (fcpat, FC_INDEX, 0, &face_index);
 153
 154   string file_name;
 155   if (file_name_as_ptr)
 156     // Normalize file name.
 157     file_name = File_name ((char const *)file_name_as_ptr).to_string ();
 158
 159   SCM glyph_exprs = SCM_EOL;
 160   SCM *tail = &glyph_exprs;
 161
 162   Index_to_charcode_map const *cmap = 0;
 163   bool has_glyph_names = ftface->face_flags & FT_FACE_FLAG_GLYPH_NAMES;
 164   if (!has_glyph_names)
 165     cmap = all_fonts_global->get_index_to_charcode_map (
 166              file_name, face_index, ftface);
 167
 168   bool is_ttf = string (FT_Get_X11_Font_Format (ftface)) == "TrueType";
 169   bool cid_keyed = false;
 170
 171   for (int i = 0; i < pgs->num_glyphs; i++)
 172     {
 173       PangoGlyphInfo *pgi = pgs->glyphs + i;
 174
 175       PangoGlyph pg = pgi->glyph;
 176       PangoGlyphGeometry ggeo = pgi->geometry;
 177
 178       glyph_name[0] = '\0';
 179       if (has_glyph_names)
 180         {
 181           int errorcode = FT_Get_Glyph_Name (ftface, pg, glyph_name,
 182                                              GLYPH_NAME_LEN);
 183           if (errorcode)
 184             programming_error (
 185               _f ("FT_Get_Glyph_Name () error: %s",
 186                   freetype_error_string (errorcode).c_str ()));
 187         }
 188
 189       SCM char_id = SCM_EOL;
 190       if (glyph_name[0] == '\0'
 191           && cmap
 192           && is_ttf
 193           && cmap->find (pg) != cmap->end ())
 194         {
 195           FT_ULong char_code = cmap->find (pg)->second;
 196           get_unicode_name (glyph_name, char_code);
 197         }
 198
 199       if (glyph_name[0] == '\0' && has_glyph_names)
 200         {
 201           programming_error (
 202             _f ("Glyph has no name, but font supports glyph naming.\n"
 203                 "Skipping glyph U+%0X, file %s",
 204                 pg, file_name.c_str ()));
 205           continue;
 206         }
 207
 208       if (glyph_name == string (".notdef") && is_ttf)
 209         glyph_name[0] = '\0';
 210
 211       if (glyph_name[0] == '\0' && is_ttf)
 212         // Access by glyph index directly.
 213         get_glyph_index_name (glyph_name, pg);
 214
 215       if (glyph_name[0] == '\0')
 216         {
 217           // CID entry
 218           cid_keyed = true;
 219           char_id = scm_from_uint32 (pg);
 220         }
 221       else
 222         char_id = scm_from_locale_string (glyph_name);
 223
 224       *tail = scm_cons (scm_list_4 (scm_from_double (ggeo.width * scale_),
 225                                     scm_from_double (ggeo.x_offset * scale_),
 226                                     scm_from_double (ggeo.y_offset * scale_),
 227                                     char_id),
 228                         SCM_EOL);
 229       tail = SCM_CDRLOC (*tail);
 230     }
 231
 232   pango_glyph_string_free (pgs);
 233   pgs = 0;
 234   PangoFontDescription *descr = pango_font_describe (pa->font);
 235   Real size = pango_font_description_get_size (descr)
 236               / (Real (PANGO_SCALE));
 237
 238   if (!ps_name_str0)
 239     warning (_f ("no PostScript font name for font `%s'", file_name));
 240
 241   string ps_name;
 242   if (!ps_name_str0
 243       && file_name != ""
 244       && (file_name.find (".otf") != NPOS
 245           || file_name.find (".cff") != NPOS))
 246     {
 247       // UGH: kludge a PS name for OTF/CFF fonts.
 248       string name = file_name;
 249       ssize idx = file_name.find (".otf");
 250       if (idx == NPOS)
 251         idx = file_name.find (".cff");
 252
 253       name = name.substr (0, idx);
 254
 255       ssize slash_idx = name.rfind ('/');
 256       if (slash_idx != NPOS)
 257         {
 258           slash_idx ++;
 259           name = name.substr (slash_idx,
 260                               name.length () - slash_idx);
 261         }
 262
 263       string initial = name.substr (0, 1);
 264       initial = String_convert::to_upper (initial);
 265       name = name.substr (1, name.length () - 1);
 266       name = String_convert::to_lower (name);
 267       ps_name = initial + name;
 268     }
 269   else if (ps_name_str0)
 270     ps_name = ps_name_str0;
 271
 272   if (ps_name.length ())
 273     {
 274       ((Pango_font *) this)->register_font_file (file_name,
 275                                                  ps_name,
 276                                                  face_index);
 277       pango_fc_font_unlock_face (fcfont);
 278
 279       SCM expr = scm_list_5 (ly_symbol2scm ("glyph-string"),
 280                              ly_string2scm (ps_name),
 281                              scm_from_double (size),
 282                              scm_from_bool (cid_keyed),
 283                              ly_quote_scm (glyph_exprs));
 284
 285       return Stencil (b, expr);
 286     }
 287
 288   warning (_ ("FreeType face has no PostScript font name"));
 289   return Stencil ();
 290 }
 291
 292 SCM
 293 Pango_font::physical_font_tab () const
 294 {
 295   return physical_font_tab_;
 296 }
 297
 298 Stencil
 299 Pango_font::word_stencil (string str, bool feta) const
 300 {
 301   return text_stencil (str, feta, true);
 302 }
 303
 304 Stencil
 305 Pango_font::text_stencil (string str, bool feta) const
 306 {
 307   return text_stencil (str, feta, false);
 308 }
 309
 310 Stencil
 311 Pango_font::text_stencil (string str,
 312                           bool feta,
 313                           bool tight) const
 314 {
 315   GList *items
 316     = pango_itemize (context_,
 317                      str.c_str (),
 318                      0, str.length (), attribute_list_,
 319                      NULL);
 320
 321   Stencil dest;
 322
 323   Real last_x = 0.0;
 324
 325   Direction text_dir = RIGHT;
 326   for (GList *p = items; p; p = p->next)
 327     {
 328       PangoItem *item = (PangoItem *) p->data;
 329       if (item->analysis.level == PANGO_DIRECTION_RTL)
 330         text_dir = LEFT;
 331     }
 332
 333   for (GList *ptr = items; ptr; ptr = ptr->next)
 334     {
 335       PangoItem *item = (PangoItem *) ptr->data;
 336
 337       Stencil item_stencil = pango_item_string_stencil (item, str, tight);
 338
 339       if (text_dir == RIGHT)
 340         {
 341           item_stencil.translate_axis (last_x, X_AXIS);
 342           last_x = item_stencil.extent (X_AXIS)[RIGHT];
 343         }
 344       else if (text_dir == LEFT)
 345         dest.translate_axis (item_stencil.extent (X_AXIS)[RIGHT], X_AXIS);
 346
 347 #if 0 // Check extents.
 348       if (!item_stencil.extent_box ()[X_AXIS].is_empty ())
 349         {
 350           Stencil frame = Lookup::frame (item_stencil.extent_box (), 0.1, 0.1);
 351           Box empty;
 352           empty.set_empty ();
 353           Stencil dimless_frame (empty, frame.expr ());
 354           dest.add_stencil (frame);
 355         }
 356 #endif
 357
 358       dest.add_stencil (item_stencil);
 359     }
 360
 361   string name = get_output_backend_name ();
 362   string output_mod = "scm output-" + name;
 363   SCM mod = scm_c_resolve_module (output_mod.c_str ());
 364
 365   bool has_utf8_string = false;
 366
 367   if (ly_is_module (mod))
 368     {
 369       SCM utf8_string = ly_module_lookup (mod, ly_symbol2scm ("utf-8-string"));
 370       /*
 371         has_utf8_string should only be true when utf8_string is a
 372         variable that is bound to a *named* procedure.
 373       */
 374       if (utf8_string != SCM_BOOL_F
 375           && scm_procedure_name (SCM_VARIABLE_REF (utf8_string)) != SCM_BOOL_F)
 376         has_utf8_string = true;
 377     }
 378
 379   /*
 380     The SVG backend only uses utf-8-string for the non-music
 381     fonts, hence the check here.  --pmccarty
 382
 383     TODO: use a program option (-dmusic-strings-to-paths) here
 384     instead that is enabled only when -dbackend=svg.
 385   */
 386   if ((name == "svg" && !feta) || (name != "svg" && has_utf8_string))
 387     {
 388       // For Pango based backends, we take a shortcut.
 389       SCM exp = scm_list_3 (ly_symbol2scm ("utf-8-string"),
 390                             ly_string2scm (description_string ()),
 391                             ly_string2scm (str));
 392
 393       Box b (Interval (0, 0), Interval (0, 0));
 394       b.unite (dest.extent_box ());
 395       return Stencil (b, exp);
 396     }
 397
 398   g_list_free (items);
 399
 400   return dest;
 401 }
 402
 403 string
 404 Pango_font::description_string () const
 405 {
 406   char *descr_string = pango_font_description_to_string (pango_description_);
 407   string s (descr_string);
 408   g_free (descr_string);
 409   return s;
 410 }
 411
 412 SCM
 413 Pango_font::font_file_name () const
 414 {
 415   return SCM_BOOL_F;
 416 }
 417
 418 #endif // HAVE_PANGO_FT2