lily/pango-font.cc

   1 /*
   2   pango-font.cc -- implement Pango_font
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2004--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #define PANGO_ENABLE_BACKEND // ugh, why necessary?
  10 #include <pango/pangoft2.h>
  11 #include <freetype/ftxf86.h>
  12
  13 #include <map>
  14
  15 /* Ugh.  */
  16
  17 #include "pango-font.hh"
  18 #include "dimensions.hh"
  19 #include "file-name.hh"
  20 #include "international.hh"
  21 #include "lookup.hh"            // debugging
  22 #include "main.hh"
  23 #include "string-convert.hh"
  24 #include "warn.hh"
  25 #include "all-font-metrics.hh"
  26 #include "program-option.hh"
  27
  28 #if HAVE_PANGO_FT2
  29 #include "stencil.hh"
  30
  31 Pango_font::Pango_font (PangoFT2FontMap *fontmap,
  32                         PangoFontDescription const *description,
  33                         Real output_scale)
  34 {
  35   (void) fontmap;
  36
  37   physical_font_tab_ = scm_c_make_hash_table (11);
  38   PangoDirection pango_dir = PANGO_DIRECTION_LTR;
  39   context_
  40     = pango_ft2_get_context (PANGO_RESOLUTION, PANGO_RESOLUTION);
  41
  42   pango_description_ = pango_font_description_copy (description);
  43   attribute_list_ = pango_attr_list_new ();
  44
  45   /*
  46     urgh. I don't understand this. Why isn't this 1/(scale *
  47     resolution * output_scale)
  48
  49     --hwn
  50   */
  51   output_scale_ = output_scale;
  52   scale_ = INCH_TO_BP / (Real (PANGO_SCALE) * Real (PANGO_RESOLUTION) * output_scale);
  53
  54   /*
  55     ugh. Should make this configurable.
  56   */
  57   pango_context_set_language (context_, pango_language_from_string ("en_US"));
  58   pango_context_set_base_dir (context_, pango_dir);
  59   pango_context_set_font_description (context_, description);
  60 }
  61
  62 Pango_font::~Pango_font ()
  63 {
  64   pango_font_description_free (pango_description_);
  65   g_object_unref (context_);
  66   pango_attr_list_unref (attribute_list_);
  67 }
  68
  69 void
  70 Pango_font::register_font_file (string filename, string ps_name)
  71 {
  72   scm_hash_set_x (physical_font_tab_,
  73                   ly_string2scm (ps_name),
  74                   ly_string2scm (filename));
  75 }
  76
  77 void
  78 Pango_font::derived_mark () const
  79 {
  80   scm_gc_mark (physical_font_tab_);
  81 }
  82
  83
  84 void
  85 get_glyph_index_name (char *s, FT_ULong code)
  86 {
  87   sprintf (s, "glyphIndex%lX", code);
  88 }
  89
  90 void
  91 get_unicode_name (char*s, FT_ULong code)
  92 {
  93   if (code > 0xFFFF)
  94     sprintf (s,  "u%lX", code);
  95   else
  96     sprintf (s,  "uni%04lX", code);
  97 }
  98
  99
 100 Stencil
 101 Pango_font::pango_item_string_stencil (PangoItem const *item, string str,
 102                                        bool tight_bbox) const
 103 {
 104   const int GLYPH_NAME_LEN = 256;
 105   char glyph_name[GLYPH_NAME_LEN];
 106   PangoAnalysis const *pa = &(item->analysis);
 107   PangoGlyphString *pgs = pango_glyph_string_new ();
 108
 109   pango_shape (str.c_str () + item->offset,
 110                item->length, (PangoAnalysis*) pa, pgs);
 111
 112   PangoRectangle logical_rect;
 113   PangoRectangle ink_rect;
 114   pango_glyph_string_extents (pgs, pa->font, &ink_rect, &logical_rect);
 115
 116   PangoFcFont *fcfont = G_TYPE_CHECK_INSTANCE_CAST (pa->font,
 117                                                     PANGO_TYPE_FC_FONT,
 118                                                     PangoFcFont);
 119
 120   FT_Face ftface = pango_fc_font_lock_face (fcfont);
 121
 122   PangoRectangle const *which_rect
 123     = (tight_bbox)
 124     ? &ink_rect
 125     : &logical_rect;
 126
 127   Box b (Interval (PANGO_LBEARING (logical_rect),
 128                    PANGO_RBEARING (logical_rect)),
 129          Interval (-PANGO_DESCENT (*which_rect),
 130                    PANGO_ASCENT (*which_rect)));
 131
 132   b.scale (scale_);
 133   char const *ps_name_str0 = FT_Get_Postscript_Name (ftface);
 134   FcPattern *fcpat = fcfont->font_pattern;
 135   FcChar8 *file_name_as_ptr = 0;
 136   FcPatternGetString (fcpat, FC_FILE, 0, &file_name_as_ptr);
 137
 138   string file_name;
 139   if (file_name_as_ptr)
 140     {
 141       /* Normalize file name.  */
 142       file_name = File_name ((char const *)file_name_as_ptr).to_string ();
 143     }
 144
 145   SCM glyph_exprs = SCM_EOL;
 146   SCM *tail = &glyph_exprs;
 147
 148   Index_to_charcode_map const *cmap = 0;
 149   bool has_glyph_names = ftface->face_flags & FT_FACE_FLAG_GLYPH_NAMES;
 150   if  (! has_glyph_names)
 151     cmap = all_fonts_global->get_index_to_charcode_map (file_name, ftface);
 152
 153   bool is_ttf = string (FT_Get_X11_Font_Format (ftface)) == "TrueType";
 154   bool cid_keyed = false;
 155   for (int i = 0; i < pgs->num_glyphs; i++)
 156     {
 157       PangoGlyphInfo *pgi = pgs->glyphs + i;
 158
 159       PangoGlyph pg = pgi->glyph;
 160       PangoGlyphGeometry ggeo = pgi->geometry;
 161
 162       glyph_name[0] = '\0';
 163       if (has_glyph_names)
 164         {
 165           int errorcode = FT_Get_Glyph_Name (ftface, pg, glyph_name, GLYPH_NAME_LEN);
 166           if (errorcode)
 167             programming_error (_f ("FT_Get_Glyph_Name () error: %s",
 168                                    freetype_error_string (errorcode).c_str ()
 169                                    ));
 170         }
 171
 172       SCM char_id = SCM_EOL;
 173       if (glyph_name[0] == '\0'
 174           && cmap
 175           && is_ttf
 176           && cmap->find (pg) != cmap->end ())
 177         {
 178           FT_ULong char_code = cmap->find (pg)->second;
 179           get_unicode_name (glyph_name, char_code);
 180         }
 181
 182       if (glyph_name[0] ==  '\0' && has_glyph_names)
 183         {
 184           programming_error (_f ("Glyph has no name, but font supports glyph naming.\n"
 185                                  "Skipping glyph U+%0X, file %s",
 186                                  pg,
 187                                  file_name.c_str ()));
 188           continue;
 189         }
 190
 191
 192       if (glyph_name == string (".notdef") && is_ttf)
 193         glyph_name[0] = '\0';
 194
 195       if (glyph_name[0] == '\0' && is_ttf)
 196         {
 197           // access by glyph index directly.
 198           get_glyph_index_name (glyph_name, pg);
 199         }
 200
 201       if (glyph_name[0] == '\0')
 202         {
 203           /*
 204             CID entry
 205           */
 206           cid_keyed = true;
 207           char_id = scm_from_uint32 (pg);
 208         }
 209       else
 210         char_id = scm_from_locale_string (glyph_name);
 211
 212       *tail = scm_cons (scm_list_4 (scm_from_double (ggeo.width * scale_),
 213                                     scm_from_double (ggeo.x_offset * scale_),
 214                                     scm_from_double (ggeo.y_offset * scale_),
 215
 216                                     char_id),
 217                         SCM_EOL);
 218       tail = SCM_CDRLOC (*tail);
 219     }
 220
 221   pango_glyph_string_free (pgs);
 222   pgs = 0;
 223   PangoFontDescription *descr = pango_font_describe (pa->font);
 224   Real size = pango_font_description_get_size (descr)
 225     / (Real (PANGO_SCALE));
 226
 227
 228   if (!ps_name_str0)
 229     warning (_f ("no PostScript font name for font `%s'", file_name));
 230
 231   string ps_name;
 232   if (!ps_name_str0
 233       && file_name != ""
 234       && (file_name.find (".otf") != NPOS
 235           || file_name.find (".cff") != NPOS))
 236     {
 237
 238       /* UGH: kludge a PS name for OTF/CFF fonts.  */
 239       string name = file_name;
 240       ssize idx = file_name.find (".otf");
 241       if (idx == NPOS)
 242         idx = file_name.find (".cff");
 243
 244       name = name.substr (0, idx);
 245
 246       ssize slash_idx = name.rfind ('/');
 247       if (slash_idx != NPOS)
 248         {
 249           slash_idx ++;
 250           name = name.substr (slash_idx,
 251                               name.length () - slash_idx);
 252         }
 253
 254       string initial = name.substr (0, 1);
 255       initial = String_convert::to_upper (initial);
 256       name = name.substr (1, name.length () - 1);
 257       name = String_convert::to_lower (name);
 258       ps_name = initial + name;
 259     }
 260   else if (ps_name_str0)
 261     ps_name = ps_name_str0;
 262
 263   if (ps_name.length ())
 264     {
 265       ((Pango_font *) this)->register_font_file (file_name, ps_name);
 266       pango_fc_font_unlock_face (fcfont);
 267
 268       SCM expr = scm_list_5 (ly_symbol2scm ("glyph-string"),
 269                              ly_string2scm (ps_name),
 270                              scm_from_double (size),
 271                              scm_from_bool (cid_keyed),
 272                              ly_quote_scm (glyph_exprs));
 273
 274       return Stencil (b, expr);
 275     }
 276
 277   warning (_ ("FreeType face has no PostScript font name"));
 278   return Stencil ();
 279 }
 280
 281 SCM
 282 Pango_font::physical_font_tab () const
 283 {
 284   return physical_font_tab_;
 285 }
 286
 287
 288 Stencil
 289 Pango_font::word_stencil (string str) const
 290 {
 291   return text_stencil (str, true);
 292 }
 293
 294 Stencil
 295 Pango_font::text_stencil (string str) const
 296 {
 297   return text_stencil (str, false);
 298 }
 299
 300 Stencil
 301 Pango_font::text_stencil (string str, bool tight) const
 302 {
 303   GList *items
 304     = pango_itemize (context_,
 305                      str.c_str (),
 306                      0, str.length (), attribute_list_,
 307                      NULL);
 308
 309   Stencil dest;
 310
 311   Real last_x = 0.0;
 312
 313   Direction text_dir = RIGHT;
 314   for (GList *p = items; p; p = p->next)
 315     {
 316       PangoItem *item = (PangoItem *) p->data;
 317       if (item->analysis.level == PANGO_DIRECTION_RTL)
 318         text_dir = LEFT;
 319     }
 320
 321   for (GList *ptr = items; ptr; ptr = ptr->next)
 322     {
 323       PangoItem *item = (PangoItem *) ptr->data;
 324
 325       Stencil item_stencil = pango_item_string_stencil (item, str, tight);
 326
 327       if (text_dir == RIGHT)
 328         {
 329           item_stencil.translate_axis (last_x, X_AXIS);
 330           last_x = item_stencil.extent (X_AXIS)[RIGHT];
 331         }
 332       else if (text_dir == LEFT)
 333         {
 334           dest.translate_axis (item_stencil.extent (X_AXIS)[RIGHT], X_AXIS);
 335         }
 336
 337 #if 0 /* Check extents.  */
 338       if (!item_stencil.extent_box ()[X_AXIS].is_empty ())
 339         {
 340           Stencil frame = Lookup::frame (item_stencil.extent_box (), 0.1, 0.1);
 341           Box empty;
 342           empty.set_empty ();
 343           Stencil dimless_frame (empty, frame.expr ());
 344           dest.add_stencil (frame);
 345         }
 346 #endif
 347
 348       dest.add_stencil (item_stencil);
 349     }
 350
 351   /*
 352     UGH. Should have flags per output format signifying supported
 353     options.
 354   */
 355   string name = get_output_backend_name ();
 356   if (name != "ps" && name != "eps")
 357     {
 358       /*
 359         For Pango based backends, we take a shortcut.
 360       */
 361       SCM exp
 362         = scm_list_3 (ly_symbol2scm ("utf-8-string"),
 363                       ly_string2scm (description_string ()),
 364                       ly_string2scm (str));
 365
 366       Box b (Interval (0, 0), Interval (0, 0));
 367       b.unite (dest.extent_box ());
 368       return Stencil (b, exp);
 369     }
 370
 371   g_list_free (items);
 372
 373   return dest;
 374 }
 375
 376 string
 377 Pango_font::description_string () const
 378 {
 379   char *descr_string = pango_font_description_to_string (pango_description_);
 380   string s (descr_string);
 381   g_free (descr_string);
 382   return s;
 383 }
 384
 385
 386 SCM
 387 Pango_font::font_file_name () const
 388 {
 389   return SCM_BOOL_F;
 390 }
 391
 392 #endif