lily/vaticana-ligature-engraver.cc

   1 /*
   2   vaticana-ligature-engraver.cc -- implement Vaticana_ligature_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  2003 Juergen Reuter <reuter@ipd.uka.de>
   7  */
   8
   9 #include "gregorian-ligature-engraver.hh"
  10 #include "gregorian-ligature.hh"
  11 #include "vaticana-ligature.hh"
  12 #include "item.hh"
  13 #include "spanner.hh"
  14 #include "staff-symbol-referencer.hh"
  15 #include "font-interface.hh"
  16 #include "warn.hh"
  17 #include "paper-def.hh"
  18 #include "paper-column.hh"
  19
  20 /*
  21  * This class implements the notation specific aspects of Vaticana
  22  * style ligatures for Gregorian chant notation.
  23  */
  24 class Vaticana_ligature_engraver : public Gregorian_ligature_engraver
  25 {
  26
  27 private:
  28   Real finish_primitive (Item *first_primitive,
  29                          Item *primitive,
  30                          int context_info,
  31                          String glyph_name,
  32                          int pitch_delta,
  33                          Real flexa_width,
  34                          Real join_thickness,
  35                          Real distance);
  36
  37 public:
  38   TRANSLATOR_DECLARATIONS(Vaticana_ligature_engraver);
  39
  40 protected:
  41   virtual Spanner *create_ligature_spanner ();
  42   virtual void transform_heads (Spanner *ligature,
  43                                 Array<Grob_info> primitives);
  44 };
  45
  46 Vaticana_ligature_engraver::Vaticana_ligature_engraver ()
  47 {
  48 }
  49
  50 Spanner *
  51 Vaticana_ligature_engraver::create_ligature_spanner ()
  52 {
  53   return new Spanner (get_property ("VaticanaLigature"));
  54 }
  55
  56 Real
  57 Vaticana_ligature_engraver::finish_primitive (Item *first_primitive,
  58                                               Item *primitive,
  59                                               int context_info,
  60                                               String glyph_name,
  61                                               int pitch_delta,
  62                                               Real flexa_width,
  63                                               Real join_thickness,
  64                                               Real distance)
  65 {
  66   Real next_distance = distance;
  67   if (primitive)
  68     {
  69       // determine width of previous head and x-offset
  70       Real head_width;
  71       Real x_offset;
  72       bool is_stacked;
  73       is_stacked = context_info & PES_UPPER;
  74       if (context_info & FLEXA_LEFT)
  75         is_stacked = false;
  76       if (!String::compare (glyph_name, "vaticana_cephalicus") &&
  77           !(context_info & PES_LOWER))
  78         is_stacked = true;
  79       if (context_info & AUCTUM)
  80         is_stacked = false;
  81       if (is_stacked)
  82         {
  83           /*
  84            * This head is stacked upon another one; hence, it does not
  85            * contribute to the total width of the ligature, hence its
  86            * width is assumed to be 0.0.  Moreover, it is shifted to
  87            * the left by its width such that the right side of this
  88            * and the other head are horizontally aligned.
  89            */
  90           head_width = 0.0;
  91           x_offset = join_thickness -
  92             Font_interface::get_default_font (primitive)->
  93             find_by_name ("noteheads-" + glyph_name).extent (X_AXIS).length ();
  94         }
  95       else if (!String::compare (glyph_name, "flexa") ||
  96                !String::compare (glyph_name, ""))
  97         {
  98           /*
  99            * This head represents either half of a flexa shape.
 100            * Hence, it is assigned half the width of this shape.
 101            */
 102           head_width = 0.5 * flexa_width;
 103           x_offset = 0.0;
 104         }
 105       else // retrieve width from corresponding font
 106         {
 107           head_width =
 108             Font_interface::get_default_font (primitive)->
 109             find_by_name ("noteheads-" + glyph_name).extent (X_AXIS).length ();
 110           x_offset = 0.0;
 111         }
 112
 113       /*
 114        * Save the head's final shape and x-offset.
 115        */
 116       primitive->set_grob_property ("glyph-name",
 117                                     scm_makfrom0str (glyph_name.to_str0 ()));
 118       primitive->set_grob_property ("x-offset",
 119                                     gh_double2scm (x_offset));
 120
 121       /*
 122        * If the head is the 2nd head of a pes or flexa (but not a
 123        * flexa shape), mark this head to be joined with the left-side
 124        * neighbour head (i.e. the previous head) by a vertical beam.
 125        */
 126       if ((context_info & PES_UPPER) ||
 127           ((context_info & FLEXA_RIGHT) &&
 128            !(context_info & PES_LOWER)))
 129         {
 130           primitive->set_grob_property ("join-left",
 131                                         gh_int2scm (pitch_delta));
 132
 133           /*
 134            * Create a small overlap of adjacent heads so that the join
 135            * can be drawn perfectly between them.
 136            */
 137           next_distance -= join_thickness;
 138         }
 139       else if (!String::compare (glyph_name, ""))
 140         {
 141           /*
 142            * 2nd (virtual) head of flexa shape: join tightly with 1st
 143            * head, i.e. do *not* add additional space, such that next
 144            * head will not be off from the flexa shape.
 145            */
 146         }
 147       else if (context_info & AFTER_VIRGA)
 148         {
 149           /*
 150            * Make a small space after a virga.
 151            */
 152           next_distance += 2 * join_thickness;
 153         }
 154
 155       /*
 156        * Horizontally line-up this head to form a ligature.
 157        */
 158       get_set_column (primitive, first_primitive->get_column ());
 159       primitive->translate_axis (next_distance, X_AXIS);
 160       next_distance += head_width;
 161
 162     }
 163
 164   return next_distance;
 165 }
 166
 167 void
 168 Vaticana_ligature_engraver::transform_heads (Spanner *ligature,
 169                                              Array<Grob_info> primitives)
 170 {
 171   Real flexa_width;
 172   SCM flexa_width_scm = ligature->get_grob_property ("flexa-width");
 173   if (flexa_width_scm != SCM_EOL)
 174     {
 175       flexa_width = gh_scm2double (flexa_width_scm);
 176     }
 177   else
 178     {
 179       programming_error ("Vaticana_ligature_engraver:"
 180                          "flexa-width undefined; assuming 2.0 staff space");
 181       flexa_width =
 182         2.0 * Staff_symbol_referencer::staff_space (ligature);
 183     }
 184
 185   Real join_thickness;
 186   SCM join_thickness_scm = ligature->get_grob_property ("thickness");
 187   if (join_thickness_scm != SCM_EOL)
 188     {
 189       join_thickness = gh_scm2double (join_thickness_scm);
 190     }
 191   else
 192     {
 193       programming_error ("Vaticana_ligature_engraver:"
 194                          "thickness undefined; assuming 1.4 linethickness");
 195       join_thickness = 1.4;
 196     }
 197   join_thickness *= ligature->get_paper ()->get_var ("linethickness");
 198
 199   Item *first_primitive = 0;
 200   Item *prev_primitive = 0;
 201   int prev_context_info = 0;
 202   int prev_pitch = 0;
 203   int prev_pitch_delta = 0;
 204   String prev_glyph_name = "";
 205   Real prev_distance = 0.0;
 206   for (int i = 0; i < primitives.size(); i++) {
 207     Item *primitive = dynamic_cast<Item*> (primitives[i].grob_);
 208     Music *music_cause = primitives[i].music_cause ();
 209     int context_info = gh_scm2int (primitive->get_grob_property ("context-info"));
 210     int pitch = unsmob_pitch (music_cause->get_mus_property ("pitch"))->steps ();
 211     String glyph_name;
 212     if (!first_primitive)
 213       first_primitive = primitive;
 214     int prefix_set = gh_scm2int (primitive->get_grob_property ("prefix-set"));
 215
 216     /*
 217      * Now determine which head to typeset (this is context sensitive
 218      * information, since it depends on neighbouring heads; therefore,
 219      * this decision must be made here in the engraver rather than in
 220      * the backend).
 221      */
 222     if (prefix_set & VIRGA)
 223       glyph_name = "vaticana_virga";
 224     else if (prefix_set & QUILISMA)
 225       glyph_name = "vaticana_quilisma";
 226     else if (prefix_set & ORISCUS)
 227       glyph_name = "solesmes_oriscus";
 228     else if (prefix_set & STROPHA)
 229       if (prefix_set & AUCTUM)
 230         glyph_name = "solesmes_stropha_aucta";
 231       else glyph_name = "solesmes_stropha";
 232     else if (prefix_set & SEMIVOCALIS)
 233       if (pitch > prev_pitch)
 234         glyph_name = "vaticana_epiphonus";
 235       else glyph_name = "vaticana_cephalicus";
 236     else if (prefix_set & INCLINATUM)
 237       if (prefix_set & AUCTUM)
 238         glyph_name = "solesmes_incl_auctum";
 239       else if (prefix_set & DEMINUTUM)
 240         glyph_name = "solesmes_incl_parvum";
 241       else
 242         glyph_name = "vaticana_inclinatum";
 243     else if (prefix_set & (CAVUM | LINEA))
 244       if ((prefix_set & CAVUM) && (prefix_set & LINEA))
 245         glyph_name = "vaticana_linea_punctum_cavum";
 246       else if (prefix_set & CAVUM)
 247         glyph_name = "vaticana_punctum_cavum";
 248       else
 249         glyph_name = "vaticana_linea_punctum";
 250     else if (prefix_set & AUCTUM)
 251       if (prefix_set & ASCENDENS)
 252         glyph_name = "solesmes_auct_asc";
 253       else
 254         glyph_name = "solesmes_auct_desc";
 255     else if (prefix_set & DEMINUTUM)
 256       glyph_name = "vaticana_plica";
 257     else if ((prefix_set & PES_OR_FLEXA) &&
 258              (context_info & PES_LOWER) &&
 259              (context_info & FLEXA_RIGHT))
 260       glyph_name = ""; // second head of flexa shape
 261     else if (context_info & PES_UPPER)
 262       if (pitch - prev_pitch > 1)
 263         glyph_name = "vaticana_upes";
 264       else
 265         glyph_name = "vaticana_vupes";
 266     else
 267       glyph_name = "vaticana_punctum";
 268
 269     /*
 270      * May need updating previous head, depending on the current head.
 271      */
 272     if (prefix_set & PES_OR_FLEXA)
 273       if ((context_info & PES_LOWER) &&
 274           (context_info & FLEXA_RIGHT)) // flexa shape
 275         {
 276           prev_glyph_name = "flexa";
 277           prev_primitive->set_grob_property ("flexa-height",
 278                                              gh_int2scm (pitch - prev_pitch));
 279           prev_primitive->set_grob_property ("flexa-width",
 280                                              gh_double2scm (flexa_width));
 281           bool add_stem =
 282             !(prev_context_info & PES_UPPER) &&
 283             !(prev_context_info & FLEXA_RIGHT);
 284           prev_primitive->set_grob_property ("add-stem",
 285                                              gh_bool2scm (add_stem));
 286         }
 287       else if (context_info & PES_UPPER)
 288         {
 289           if (!String::compare (prev_glyph_name, "vaticana_punctum"))
 290             prev_glyph_name = "vaticana_lpes";
 291         }
 292       else // flexa
 293         {
 294           if (!String::compare (prev_glyph_name, "vaticana_punctum"))
 295             prev_glyph_name = "vaticana_rvirga";
 296         }
 297
 298     /*
 299      * In the backend, flexa shapes and joins need to know about
 300      * thickness.  Hence, for simplicity, let's distribute the
 301      * ligature grob's value for thickness to each ligature head (even
 302      * if not all of them need to know).
 303      */
 304     primitive->set_grob_property ("thickness", gh_double2scm (join_thickness));
 305
 306     /*
 307      * The head of the current iteration still may change during the
 308      * next iteration due to the context sensitiveness of the
 309      * transformation.  However, the head of the previous iteration is
 310      * now fully attributed and can be prepared for the backend.
 311      */
 312
 313     /*
 314      * Finish head of previous iteration for backend.
 315      */
 316     prev_distance =
 317       finish_primitive (first_primitive, prev_primitive,
 318                         prev_context_info, prev_glyph_name, prev_pitch_delta,
 319                         flexa_width, join_thickness, prev_distance);
 320
 321     prev_primitive = primitive;
 322     prev_context_info = context_info;
 323     prev_pitch_delta = pitch - prev_pitch;
 324     prev_pitch = pitch;
 325     prev_glyph_name = glyph_name;
 326   }
 327
 328   /*
 329    * Finish head of last iteration for backend.
 330    */
 331   prev_distance =
 332     finish_primitive (first_primitive, prev_primitive,
 333                       prev_context_info, prev_glyph_name, prev_pitch_delta,
 334                       flexa_width, join_thickness, prev_distance);
 335
 336   /* TODO: make this cfg'able via SCM */
 337   Real padding = join_thickness;
 338
 339   /* horizontal padding space after ligature */
 340   prev_distance += padding;
 341
 342 #if 0 // experimental code to collapse spacing after ligature
 343   /* TODO: set to max(old/new spacing-increment), since other
 344      voices/staves also may want to set this property. */
 345   Paper_column *paper_column = first_primitive->get_column();
 346   paper_column->warning (_f ("Vaticana_ligature_engraver: "
 347                              "setting `spacing-increment = %f': ptr=%ul",
 348                              prev_distance, paper_column));
 349   paper_column->
 350     set_grob_property("forced-spacing", gh_double2scm (prev_distance));
 351 #endif
 352 }
 353
 354
 355 ENTER_DESCRIPTION (Vaticana_ligature_engraver,
 356 /* descr */       "Handles ligatures by glueing special ligature heads together.",
 357 /* creats*/       "VaticanaLigature",
 358 /* accepts */     "ligature-event abort-event",
 359 /* acks  */      "ligature-head-interface note-head-interface rest-interface",
 360 /* reads */       "",
 361 /* write */       "");