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--2005 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 "lookup.hh"
  18 #include "main.hh"
  19 #include "warn.hh"
  20
  21 #if HAVE_PANGO_FT2
  22 #include "stencil.hh"
  23
  24 Pango_font::Pango_font (PangoFT2FontMap *fontmap,
  25                         Direction dir,
  26                         PangoFontDescription *description,
  27                         Real output_scale)
  28 {
  29   (void) fontmap;
  30   physical_font_tab_ = scm_c_make_hash_table (11);
  31   PangoDirection pango_dir = (dir == RIGHT)
  32     ? PANGO_DIRECTION_LTR
  33     : PANGO_DIRECTION_RTL;
  34   context_
  35     = pango_ft2_get_context (PANGO_RESOLUTION, PANGO_RESOLUTION);
  36   //  context_ = pango_ft2_font_map_create_context (fontmap);
  37
  38   pango_description_ = pango_font_description_copy (description);
  39   attribute_list_ = pango_attr_list_new ();
  40
  41   /*
  42     urgh. I don't understand this. Why isn't this 1/(scale *
  43     resolution * output_scale)
  44
  45     --hwn
  46   */
  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.to_str0 ()),
  69                   scm_makfrom0str (filename.to_str0 ()));
  70 }
  71
  72 void
  73 Pango_font::derived_mark () const
  74 {
  75   scm_gc_mark (physical_font_tab_);
  76 }
  77
  78 Stencil
  79 Pango_font::pango_item_string_stencil (PangoItem *item, String str, Real dx) const
  80 {
  81   const int GLYPH_NAME_LEN = 256;
  82   char glyph_name[GLYPH_NAME_LEN];
  83   PangoAnalysis *pa = &(item->analysis);
  84   PangoGlyphString *pgs = pango_glyph_string_new ();
  85
  86   pango_shape (str.to_str0 () + item->offset,
  87                item->length, pa, pgs);
  88
  89   PangoRectangle logical_rect;
  90   PangoRectangle ink_rect;
  91   pango_glyph_string_extents (pgs, pa->font, &ink_rect, &logical_rect);
  92
  93   PangoFcFont *fcfont = G_TYPE_CHECK_INSTANCE_CAST (pa->font,
  94                                                     PANGO_TYPE_FC_FONT,
  95                                                     PangoFcFont);
  96
  97   FT_Face ftface = pango_fc_font_lock_face (fcfont);
  98   Box b (Interval (PANGO_LBEARING (ink_rect),
  99                    PANGO_RBEARING (ink_rect)),
 100          Interval (-PANGO_DESCENT (ink_rect),
 101                    PANGO_ASCENT (ink_rect)));
 102
 103   b.scale (scale_);
 104
 105   SCM glyph_exprs = SCM_EOL;
 106   SCM *tail = &glyph_exprs;
 107
 108   bool cid_keyed = false;
 109   for (int i = 0; i < pgs->num_glyphs; i++)
 110     {
 111       PangoGlyphInfo *pgi = pgs->glyphs + i;
 112
 113       PangoGlyph pg = pgi->glyph;
 114       PangoGlyphGeometry ggeo = pgi->geometry;
 115
 116       FT_Get_Glyph_Name (ftface, pg, glyph_name, GLYPH_NAME_LEN);
 117
 118       SCM char_id;
 119       if (glyph_name[0] == '\0')
 120         {
 121           /*
 122             CID entry
 123           */
 124           cid_keyed = true;
 125           char_id = scm_from_int (pg);
 126         }
 127       else
 128         char_id = scm_makfrom0str (glyph_name);
 129       *tail = scm_cons (scm_list_3 (scm_from_double (ggeo.x_offset * scale_
 130                                                      + dx),
 131                                     scm_from_double (ggeo.y_offset * scale_),
 132                                     char_id),
 133                         SCM_EOL);
 134       dx = 0.0;
 135       tail = SCM_CDRLOC (*tail);
 136     }
 137
 138   PangoFontDescription *descr = pango_font_describe (pa->font);
 139   Real size = pango_font_description_get_size (descr)
 140     / (Real (PANGO_SCALE));
 141
 142   FcPattern *fcpat = fcfont->font_pattern;
 143   char *file_name = 0;
 144   FcPatternGetString (fcpat, FC_FILE, 0, (FcChar8 **) & file_name);
 145 #ifdef __MINGW32__
 146   /* Normalize file name.  */
 147   // FIXME: memleak(s?), drop the #ifdef?
 148   file_name = File_name (file_name).to_string ().get_copy_str0 ();
 149 #endif
 150
 151   char const *ps_name_str0 = FT_Get_Postscript_Name (ftface);
 152
 153   if (!ps_name_str0)
 154     warning (_f ("no PostScript font name for font `%s'", file_name));
 155
 156   String ps_name;
 157   if (!ps_name_str0
 158       && file_name
 159       && (String (file_name).index (".otf") >= 0
 160           || String (file_name).index (".cff") >= 0))
 161     {
 162
 163       /* UGH: kludge a PS name for OTF/CFF fonts.  */
 164       String name = file_name;
 165       int idx = max (String (file_name).index (".otf"),
 166                      String (file_name).index (".cff"));
 167
 168       name = name.left_string (idx);
 169
 170       int slash_idx = name.index_last ('/');
 171       if (slash_idx >= 0)
 172         name = name.right_string (name.length () - slash_idx - 1);
 173
 174       String initial = name.cut_string (0, 1);
 175       initial.to_upper ();
 176       name = name.nomid_string (0, 1);
 177       name.to_lower ();
 178       ps_name = initial + name;
 179     }
 180   else if (ps_name_str0)
 181     ps_name = ps_name_str0;
 182
 183   if (ps_name.length ())
 184     {
 185       ((Pango_font *) this)->register_font_file (file_name, ps_name);
 186       pango_fc_font_unlock_face (fcfont);
 187
 188       SCM expr = scm_list_5 (ly_symbol2scm ("glyph-string"),
 189                              scm_makfrom0str (ps_name.to_str0 ()),
 190                              scm_from_double (size),
 191                              scm_from_bool (cid_keyed),
 192                              ly_quote_scm (glyph_exprs));
 193
 194       return Stencil (b, expr);
 195     }
 196
 197   warning (_ ("FreeType face has no PostScript font name"));
 198   return Stencil ();
 199 }
 200
 201 SCM
 202 Pango_font::physical_font_tab () const
 203 {
 204   return physical_font_tab_;
 205 }
 206
 207 Stencil
 208 Pango_font::text_stencil (String str) const
 209 {
 210   GList *items = pango_itemize (context_,
 211                                 str.to_str0 (),
 212                                 0, str.length (), attribute_list_,
 213                                 NULL);
 214
 215   GList *ptr = items;
 216   Stencil dest;
 217   Real x = 0.0;
 218   while (ptr)
 219     {
 220       PangoItem *item = (PangoItem *) ptr->data;
 221
 222       Stencil item_stencil = pango_item_string_stencil (item, str, x);
 223
 224       x = item_stencil.extent (X_AXIS)[RIGHT];
 225
 226       dest.add_stencil (item_stencil);
 227
 228       ptr = ptr->next;
 229     }
 230
 231   /*
 232     UGH. Should have flags per output format signifying supported
 233     options.
 234   */
 235   if (output_backend_global != "ps"
 236       && output_backend_global != "eps")
 237     {
 238       /*
 239         For Pango based backends, we take a shortcut.
 240       */
 241       char *descr_string = pango_font_description_to_string (pango_description_);
 242       SCM exp
 243         = scm_list_3 (ly_symbol2scm ("utf-8-string"),
 244                       scm_makfrom0str (descr_string),
 245                       scm_makfrom0str (str.to_str0 ()));
 246
 247       g_free (descr_string);
 248
 249       Box b (Interval (0, 0), Interval (0, 0));
 250       b.unite (dest.extent_box ());
 251       return Stencil (b, exp);
 252     }
 253
 254 #if 0 /* Check extents.  */
 255   if (!dest.extent_box ()[X_AXIS].is_empty ())
 256     {
 257       Stencil frame = Lookup::frame (dest.extent_box (), 0.1, 0.1);
 258       Box empty;
 259       empty.set_empty ();
 260       Stencil dimless_frame (empty, frame.expr ());
 261       dest.add_stencil (frame);
 262     }
 263 #endif
 264
 265   return dest;
 266 }
 267
 268 SCM
 269 Pango_font::font_file_name () const
 270 {
 271   return SCM_BOOL_F;
 272 }
 273
 274 #endif