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--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #define PANGO_ENABLE_BACKEND // ugh, why necessary?
  10 #include <pango/pangoft2.h>
  11
  12 /* Ugh.  */
  13 #include "pango-font.hh"
  14
  15 #include "dimensions.hh"
  16 #include "file-name.hh"
  17 #include "international.hh"
  18 #include "lookup.hh"
  19 #include "main.hh"
  20 #include "string-convert.hh"
  21 #include "warn.hh"
  22
  23 #if HAVE_PANGO_FT2
  24 #include "stencil.hh"
  25
  26 Pango_font::Pango_font (PangoFT2FontMap *fontmap,
  27                         PangoFontDescription *description,
  28                         Real output_scale)
  29 {
  30   (void) fontmap;
  31   physical_font_tab_ = scm_c_make_hash_table (11);
  32   PangoDirection pango_dir = PANGO_DIRECTION_LTR;
  33   context_
  34     = pango_ft2_get_context (PANGO_RESOLUTION, PANGO_RESOLUTION);
  35   //  context_ = pango_ft2_font_map_create_context (fontmap);
  36
  37   pango_description_ = pango_font_description_copy (description);
  38   attribute_list_ = pango_attr_list_new ();
  39
  40   /*
  41     urgh. I don't understand this. Why isn't this 1/(scale *
  42     resolution * output_scale)
  43
  44     --hwn
  45   */
  46   output_scale_ = output_scale;
  47   scale_ = INCH_TO_BP / (Real (PANGO_SCALE) * Real (PANGO_RESOLUTION) * output_scale);
  48
  49   /*
  50     ugh. Should make this configurable.
  51   */
  52   pango_context_set_language (context_, pango_language_from_string ("en_US"));
  53   pango_context_set_base_dir (context_, pango_dir);
  54   pango_context_set_font_description (context_, description);
  55 }
  56
  57 Pango_font::~Pango_font ()
  58 {
  59   pango_font_description_free (pango_description_);
  60   g_object_unref (context_);
  61   pango_attr_list_unref (attribute_list_);
  62 }
  63
  64 void
  65 Pango_font::register_font_file (string filename, string ps_name)
  66 {
  67   scm_hash_set_x (physical_font_tab_,
  68                   scm_makfrom0str (ps_name.c_str ()),
  69                   scm_makfrom0str (filename.c_str ()));
  70 }
  71
  72 void
  73 Pango_font::derived_mark () const
  74 {
  75   scm_gc_mark (physical_font_tab_);
  76 }
  77
  78
  79 Index_to_charcode_map const *
  80 Pango_font::get_index_to_charcode_map (string key, FT_Face face)
  81 {
  82   if (charcode_maps_.find (key) == charcode_maps_.end ())
  83     charcode_maps_[key] = make_index_to_charcode_map (face);
  84
  85   if (charcode_maps_.find (key) == charcode_maps_.end ())
  86     return 0;
  87
  88   return &charcode_maps_[key];
  89 }
  90
  91 void
  92 get_unicode_name (char*s, FT_ULong code)
  93 {
  94   if (code > 0xFFFF)
  95     sprintf (s,  "u%lX", code);
  96   else
  97     sprintf (s,  "uni%04lX", code);
  98 }
  99
 100
 101 Stencil
 102 Pango_font::pango_item_string_stencil (PangoItem const *item, string str) 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   Box b (Interval (PANGO_LBEARING (ink_rect),
 122                    PANGO_RBEARING (ink_rect)),
 123          Interval (-PANGO_DESCENT (ink_rect),
 124                    PANGO_ASCENT (ink_rect)));
 125
 126   b.scale (scale_);
 127   char const *ps_name_str0 = FT_Get_Postscript_Name (ftface);
 128   FcPattern *fcpat = fcfont->font_pattern;
 129   char *file_name_as_ptr = 0;
 130   FcPatternGetString (fcpat, FC_FILE, 0, (FcChar8 **) & file_name_as_ptr);
 131
 132   string file_name;
 133   if (file_name_as_ptr)
 134     {
 135       /* Normalize file name.  */
 136       file_name = File_name (file_name_as_ptr).to_string ();
 137     }
 138
 139   SCM glyph_exprs = SCM_EOL;
 140   SCM *tail = &glyph_exprs;
 141
 142   Index_to_charcode_map const *cmap = 0;
 143   bool has_glyph_names = ftface->face_flags & FT_FACE_FLAG_GLYPH_NAMES;
 144   if  (! has_glyph_names)
 145     cmap = ((Pango_font*)this)->get_index_to_charcode_map (file_name, ftface);
 146
 147   bool cid_keyed = false;
 148   for (int i = 0; i < pgs->num_glyphs; i++)
 149     {
 150       PangoGlyphInfo *pgi = pgs->glyphs + i;
 151
 152       PangoGlyph pg = pgi->glyph;
 153       PangoGlyphGeometry ggeo = pgi->geometry;
 154
 155       glyph_name[0] = '\0';
 156       if (has_glyph_names)
 157         {
 158           int errorcode = FT_Get_Glyph_Name (ftface, pg, glyph_name, GLYPH_NAME_LEN);
 159           if (errorcode)
 160             programming_error ("FT_Get_Glyph_Name returns error");
 161         }
 162
 163       SCM char_id = SCM_EOL;
 164       if (glyph_name[0] == '\0'
 165           && cmap
 166
 167           /* Ugh should ask FreeType about font type. */
 168           && (file_name.find (".ttf") != NPOS
 169               || file_name.find (".TTF") != NPOS))
 170         {
 171           FT_ULong char_code = cmap->find (pg)->second;
 172           get_unicode_name (glyph_name, char_code);
 173         }
 174
 175       if (glyph_name[0] ==  '\0' && has_glyph_names)
 176         {
 177           programming_error ("Glyph has no name, but font supports glyph naming. Skipping glyph.");
 178           continue;
 179         }
 180
 181       if (glyph_name[0] == '\0')
 182         {
 183           /*
 184             CID entry
 185           */
 186           cid_keyed = true;
 187           char_id = scm_from_uint32 (pg);
 188         }
 189       else
 190         char_id = scm_makfrom0str (glyph_name);
 191
 192       *tail = scm_cons (scm_list_4 (scm_from_double (ggeo.width * scale_),
 193                                     scm_from_double (ggeo.x_offset * scale_),
 194                                     scm_from_double (ggeo.y_offset * scale_),
 195
 196                                     char_id),
 197                         SCM_EOL);
 198       tail = SCM_CDRLOC (*tail);
 199     }
 200
 201   PangoFontDescription *descr = pango_font_describe (pa->font);
 202   Real size = pango_font_description_get_size (descr)
 203     / (Real (PANGO_SCALE));
 204
 205
 206   if (!ps_name_str0)
 207     warning (_f ("no PostScript font name for font `%s'", file_name));
 208
 209   string ps_name;
 210   if (!ps_name_str0
 211       && file_name != ""
 212       && (file_name.find (".otf") != NPOS
 213           || file_name.find (".cff") != NPOS))
 214     {
 215
 216       /* UGH: kludge a PS name for OTF/CFF fonts.  */
 217       string name = file_name;
 218       ssize idx = file_name.find (".otf");
 219       if (idx == NPOS)
 220         idx = file_name.find (".cff");
 221
 222       name = name.substr (0, idx);
 223
 224       ssize slash_idx = name.rfind ('/');
 225       if (slash_idx != NPOS)
 226         {
 227           slash_idx ++;
 228           name = name.substr (slash_idx,
 229                               name.length () - slash_idx);
 230         }
 231
 232       string initial = name.substr (0, 1);
 233       initial = String_convert::to_upper (initial);
 234       name = name.substr (1, name.length () - 1);
 235       name = String_convert::to_lower (name);
 236       ps_name = initial + name;
 237     }
 238   else if (ps_name_str0)
 239     ps_name = ps_name_str0;
 240
 241   if (ps_name.length ())
 242     {
 243       ((Pango_font *) this)->register_font_file (file_name, ps_name);
 244       pango_fc_font_unlock_face (fcfont);
 245
 246       SCM expr = scm_list_5 (ly_symbol2scm ("glyph-string"),
 247                              scm_makfrom0str (ps_name.c_str ()),
 248                              scm_from_double (size),
 249                              scm_from_bool (cid_keyed),
 250                              ly_quote_scm (glyph_exprs));
 251
 252       return Stencil (b, expr);
 253     }
 254
 255   warning (_ ("FreeType face has no PostScript font name"));
 256   return Stencil ();
 257 }
 258
 259 SCM
 260 Pango_font::physical_font_tab () const
 261 {
 262   return physical_font_tab_;
 263 }
 264
 265 Stencil
 266 Pango_font::text_stencil (string str) const
 267 {
 268   GList *items
 269     = pango_itemize (context_,
 270                      str.c_str (),
 271                      0, str.length (), attribute_list_,
 272                      NULL);
 273
 274   Stencil dest;
 275
 276   Real last_x = 0.0;
 277
 278   Direction text_dir = RIGHT;
 279   for (GList *p = items; p; p = p->next)
 280     {
 281       PangoItem *item = (PangoItem *) p->data;
 282       if (item->analysis.level == PANGO_DIRECTION_RTL)
 283         text_dir = LEFT;
 284     }
 285
 286   for (GList *ptr = items; ptr; ptr = ptr->next)
 287     {
 288       PangoItem *item = (PangoItem *) ptr->data;
 289
 290       Stencil item_stencil = pango_item_string_stencil (item, str);
 291
 292       if (text_dir == RIGHT)
 293         {
 294           item_stencil.translate_axis (last_x, X_AXIS);
 295           last_x = item_stencil.extent (X_AXIS)[RIGHT];
 296         }
 297       else if (text_dir == LEFT)
 298         {
 299           dest.translate_axis (item_stencil.extent (X_AXIS)[RIGHT], X_AXIS);
 300         }
 301
 302 #if 0 /* Check extents.  */
 303       if (!item_stencil.extent_box ()[X_AXIS].is_empty ())
 304         {
 305           Stencil frame = Lookup::frame (item_stencil.extent_box (), 0.1, 0.1);
 306           Box empty;
 307           empty.set_empty ();
 308           Stencil dimless_frame (empty, frame.expr ());
 309           dest.add_stencil (frame);
 310         }
 311 #endif
 312
 313       dest.add_stencil (item_stencil);
 314     }
 315
 316   /*
 317     UGH. Should have flags per output format signifying supported
 318     options.
 319   */
 320   if (output_backend_global != "ps"
 321       && output_backend_global != "eps")
 322     {
 323       /*
 324         For Pango based backends, we take a shortcut.
 325       */
 326       char *descr_string = pango_font_description_to_string (pango_description_);
 327       SCM exp
 328         = scm_list_3 (ly_symbol2scm ("utf-8-string"),
 329                       scm_makfrom0str (descr_string),
 330                       scm_makfrom0str (str.c_str ()));
 331
 332       g_free (descr_string);
 333
 334       Box b (Interval (0, 0), Interval (0, 0));
 335       b.unite (dest.extent_box ());
 336       return Stencil (b, exp);
 337     }
 338
 339
 340   return dest;
 341 }
 342
 343 SCM
 344 Pango_font::font_file_name () const
 345 {
 346   return SCM_BOOL_F;
 347 }
 348
 349 #endif