2 vaticana-ligature-engraver.cc -- implement Vaticana_ligature_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2003--2005 Juergen Reuter <reuter@ipd.uka.de>
9 #include "gregorian-ligature-engraver.hh"
10 #include "gregorian-ligature.hh"
11 #include "vaticana-ligature.hh"
13 #include "staff-symbol-referencer.hh"
14 #include "font-interface.hh"
16 #include "output-def.hh"
17 #include "paper-column.hh"
19 #include "translator.icc"
22 * This class implements the notation specific aspects of Vaticana
23 * style ligatures for Gregorian chant notation.
26 class Vaticana_ligature_engraver : public Gregorian_ligature_engraver
31 need_extra_horizontal_space (int prev_prefix_set, int prefix_set,
32 int context_info, int delta_pitch);
33 bool is_stacked_head (int prefix_set,
35 Real align_heads (Array<Grob_info> primitives,
40 TRANSLATOR_DECLARATIONS (Vaticana_ligature_engraver);
43 virtual Spanner *create_ligature_spanner ();
44 virtual void transform_heads (Spanner *ligature,
45 Array<Grob_info> primitives);
48 Vaticana_ligature_engraver::Vaticana_ligature_engraver ()
53 Vaticana_ligature_engraver::create_ligature_spanner ()
55 return make_spanner ("VaticanaLigature", SCM_EOL);
59 Vaticana_ligature_engraver::is_stacked_head (int prefix_set,
64 // upper head of pes is stacked upon lower head of pes ...
65 is_stacked_b = context_info & PES_UPPER;
67 // ... unless this note starts a flexa
68 if (context_info & FLEXA_LEFT)
72 if (context_info & PES_LOWER)
75 // ... or the previous note is a semivocalis or inclinatum
76 if (context_info & AFTER_DEMINUTUM)
79 // auctum head is never stacked upon preceding note
80 if (prefix_set & AUCTUM)
83 // virga is never stacked upon preceding note
84 if (prefix_set & VIRGA)
87 // oriscus is never stacked upon preceding note
88 if (prefix_set & ORISCUS)
91 if ((prefix_set & DEMINUTUM)
92 && ! (prefix_set & INCLINATUM)
93 && (context_info & FLEXA_RIGHT))
94 is_stacked_b = true; // semivocalis head of deminutus form
100 * When aligning the heads, sometimes extra space is needed, e.g. to
101 * avoid clashing with the appendix of an adjacent notehead or with an
102 * adjacent notehead itself if it has the same pitch. Extra space is
103 * added at most once between to heads.
106 Vaticana_ligature_engraver::need_extra_horizontal_space (int prev_prefix_set, int prefix_set,
107 int context_info, int delta_pitch)
109 if (prev_prefix_set & VIRGA)
111 * After a virga, make a an additional small space such that the
112 * appendix on the right side of the head does not touch the
117 if ((prefix_set & INCLINATUM)
118 && ! (prev_prefix_set & INCLINATUM))
120 * Always start a series of inclinatum heads with an extra space.
124 if ((context_info & FLEXA_LEFT) && ! (context_info & PES_UPPER))
126 * Before a flexa (but not within a torculus), make a an
127 * additional small space such that the appendix on the left side
128 * of the flexa does not touch the this head.
132 if (delta_pitch == 0)
134 * If there are two adjacent noteheads with the same pitch, add
135 * additional small space between them, such that they do not
144 Vaticana_ligature_engraver::align_heads (Array<Grob_info> primitives,
148 if (!primitives.size ())
150 programming_error ("Vaticana_ligature: "
151 "empty ligature [ignored]");
156 * The paper column where we put the whole ligature into.
159 = dynamic_cast<Item *> (primitives[0].grob ())->get_column ();
162 = thickness * column->get_layout ()->get_dimension (ly_symbol2scm ("linethickness"));
165 * Amount of extra space two put between some particular
166 * configurations of adjacent heads.
168 * TODO: make this a property of primtive grobs.
170 Real extra_space = 4.0 * join_thickness;
173 * Keep track of the total width of the ligature.
175 Real ligature_width = 0.0;
177 Item *prev_primitive = 0;
178 int prev_prefix_set = 0;
179 for (int i = 0; i < primitives.size (); i++)
181 Item *primitive = dynamic_cast<Item *> (primitives[i].grob ());
183 = scm_to_int (primitive->get_property ("prefix-set"));
185 = scm_to_int (primitive->get_property ("context-info"));
188 * Get glyph_name, delta_pitch and context_info for this head.
191 SCM glyph_name_scm = primitive->get_property ("glyph-name");
192 if (glyph_name_scm == SCM_EOL)
194 primitive->programming_error ("Vaticana_ligature:"
195 "undefined glyph-name -> "
199 String glyph_name = ly_scm2string (glyph_name_scm);
202 if (prev_primitive) /* urgh, need prev_primitive only here */
204 SCM delta_pitch_scm = prev_primitive->get_property ("delta-pitch");
205 if (delta_pitch_scm != SCM_EOL)
206 delta_pitch = scm_to_int (delta_pitch_scm);
209 primitive->programming_error ("Vaticana_ligature:"
210 "delta-pitch undefined -> "
217 * Now determine width and x-offset of head.
223 if (context_info & STACKED_HEAD)
226 * This head is stacked upon the previous one; hence, it
227 * does not contribute to the total width of the ligature,
228 * and its width is assumed to be 0.0. Moreover, it is
229 * shifted to the left by its width such that the right side
230 * of this and the other head are horizontally aligned.
233 x_offset = join_thickness
234 - Font_interface::get_default_font (primitive)->
235 find_by_name ("noteheads." + glyph_name).extent (X_AXIS).length ();
237 else if (!String::compare (glyph_name, "flexa")
238 || !String::compare (glyph_name, ""))
241 * This head represents either half of a flexa shape.
242 * Hence, it is assigned half the width of this shape.
244 head_width = 0.5 * flexa_width;
250 * This is a regular head, placed right to the previous one.
251 * Retrieve its width from corresponding font.
254 = Font_interface::get_default_font (primitive)->
255 find_by_name ("noteheads." + glyph_name).extent (X_AXIS).length ();
260 * Save the head's final x-offset.
262 primitive->set_property ("x-offset",
263 scm_from_double (x_offset));
266 * If the head is the 2nd head of a pes or flexa (but not a
267 * flexa shape), mark this head to be joined with the left-side
268 * neighbour head (i.e. the previous head) by a vertical beam.
270 if ((context_info & PES_UPPER)
271 || ((context_info & FLEXA_RIGHT)
272 && ! (context_info & PES_LOWER)))
276 primitive->programming_error ("vaticana ligature: add-join: "
277 "missing previous primitive");
281 prev_primitive->set_property ("add-join",
285 * Create a small overlap of adjacent heads so that the join
286 * can be drawn perfectly between them.
288 ligature_width -= join_thickness;
291 else if (!String::compare (glyph_name, ""))
294 * This is the 2nd (virtual) head of flexa shape. Join it
295 * tightly with 1st head, i.e. do *not* add additional
296 * space, such that next head will not be off from the flexa
301 if (need_extra_horizontal_space (prev_prefix_set, prefix_set,
302 context_info, delta_pitch))
303 ligature_width += extra_space;
306 * Horizontally line-up this head to form a ligature.
308 get_set_column (primitive, column);
309 primitive->translate_axis (ligature_width, X_AXIS);
310 ligature_width += head_width;
312 prev_primitive = primitive;
313 prev_prefix_set = prefix_set;
317 * Add extra horizontal padding space after ligature, such that
318 * neighbouring ligatures do not touch each other.
320 ligature_width += extra_space;
322 return ligature_width;
326 * Depending on the typographical features of a particular ligature
327 * style, some prefixes may be ignored. In particular, if a curved
328 * flexa shape is produced, any prefixes to either of the two
329 * contributing heads that would select a head other than punctum, is
330 * by definition ignored.
332 * This function prints a warning, if the given primitive is prefixed
333 * such that a head other than punctum would be chosen, if this
334 * primitive were engraved as a stand-alone head.
337 check_for_prefix_loss (Item *primitive)
340 = scm_to_int (primitive->get_property ("prefix-set"));
341 if (prefix_set & ~PES_OR_FLEXA)
343 String prefs = Gregorian_ligature::prefixes_to_str (primitive);
344 primitive->warning (_f ("ignored prefix (es) `%s' of this head according "
345 "to restrictions of the selected ligature style",
351 Vaticana_ligature_engraver::transform_heads (Spanner *ligature,
352 Array<Grob_info> primitives)
354 Real flexa_width = robust_scm2double (ligature->get_property ("flexa-width"), 2);
356 Real thickness = robust_scm2double (ligature->get_property ("thickness"), 1);
358 Item *prev_primitive = 0;
359 int prev_prefix_set = 0;
360 int prev_context_info = 0;
361 int prev_delta_pitch = 0;
362 String prev_glyph_name = "";
363 for (int i = 0; i < primitives.size (); i++)
365 Item *primitive = dynamic_cast<Item *> (primitives[i].grob ());
368 SCM delta_pitch_scm = primitive->get_property ("delta-pitch");
369 if (delta_pitch_scm != SCM_EOL)
370 delta_pitch = scm_to_int (delta_pitch_scm);
373 primitive->programming_error ("Vaticana_ligature:"
374 "delta-pitch undefined -> "
379 /* retrieve & complete prefix_set and context_info */
381 = scm_to_int (primitive->get_property ("prefix-set"));
383 = scm_to_int (primitive->get_property ("context-info"));
384 if (is_stacked_head (prefix_set, context_info))
386 context_info |= STACKED_HEAD;
387 primitive->set_property ("context-info",
388 scm_from_int (context_info));
392 * Now determine which head to typeset (this is context sensitive
393 * information, since it depends on neighbouring heads; therefore,
394 * this decision must be made here in the engraver rather than in
398 if (prefix_set & VIRGA)
400 glyph_name = "svaticana.punctum";
401 primitive->set_property ("add-stem", ly_bool2scm (true));
403 else if (prefix_set & QUILISMA)
404 glyph_name = "svaticana.quilisma";
405 else if (prefix_set & ORISCUS)
406 glyph_name = "ssolesmes.oriscus";
407 else if (prefix_set & STROPHA)
408 if (prefix_set & AUCTUM)
409 glyph_name = "ssolesmes.stropha.aucta";
410 else glyph_name = "ssolesmes.stropha";
411 else if (prefix_set & INCLINATUM)
412 if (prefix_set & AUCTUM)
413 glyph_name = "ssolesmes.incl.auctum";
414 else if (prefix_set & DEMINUTUM)
415 glyph_name = "ssolesmes.incl.parvum";
417 glyph_name = "svaticana.inclinatum";
418 else if (prefix_set & DEMINUTUM)
422 glyph_name = "svaticana.reverse.plica";
424 else if (prev_delta_pitch > 0)
427 if (! (prev_context_info & FLEXA_RIGHT))
428 /* correct head of previous primitive */
429 if (prev_delta_pitch > 1)
431 prev_glyph_name = "svaticana.epiphonus";
432 glyph_name = "svaticana.plica";
436 prev_glyph_name = "svaticana.vepiphonus";
437 glyph_name = "svaticana.vplica";
440 else if (prev_delta_pitch < 0)
443 if (! (prev_context_info & FLEXA_RIGHT))
444 /* correct head of previous primitive */
448 /* cephalicus head with fixed size cauda */
449 prev_glyph_name = "svaticana.inner.cephalicus";
453 /* cephalicus head without cauda */
454 prev_glyph_name = "svaticana.cephalicus";
458 * Flexa has no variable size cauda if its left head is
459 * stacked on the right head. This is true for
460 * cephalicus. Hence, remove the cauda.
462 * Urgh: for the current implementation, this rule only
463 * applies for cephalicus; but it is a fundamental rule.
464 * Therefore, the following line of code should be
465 * placed somewhere else.
467 prev_primitive->set_property ("add-cauda",
468 ly_bool2scm (false));
470 if (prev_delta_pitch < - 1)
472 glyph_name = "svaticana.reverse.plica";
476 glyph_name = "svaticana.reverse.vplica";
479 else // (prev_delta_pitch == 0)
481 primitive->programming_error ("Vaticana_ligature:"
482 "deminutum head must have different "
483 "pitch -> ignoring grob");
485 else if (prefix_set & (CAVUM | LINEA))
486 if ((prefix_set & CAVUM) && (prefix_set & LINEA))
487 glyph_name = "svaticana.linea.punctum.cavum";
488 else if (prefix_set & CAVUM)
489 glyph_name = "svaticana.punctum.cavum";
491 glyph_name = "svaticana.linea.punctum";
492 else if (prefix_set & AUCTUM)
493 if (prefix_set & ASCENDENS)
494 glyph_name = "ssolesmes.auct.asc";
496 glyph_name = "ssolesmes.auct.desc";
497 else if ((context_info & STACKED_HEAD)
498 && (context_info & PES_UPPER))
499 if (prev_delta_pitch > 1)
500 glyph_name = "svaticana.upes";
502 glyph_name = "svaticana.vupes";
504 glyph_name = "svaticana.punctum";
507 * This head needs a cauda, if it starts a flexa, is not the upper
508 * head of a pes, and if it is a punctum.
510 if ((context_info & FLEXA_LEFT) && ! (context_info & PES_UPPER))
511 if (!String::compare (glyph_name, "svaticana.punctum"))
512 primitive->set_property ("add-cauda", ly_bool2scm (true));
515 * Execptional rule for porrectus:
517 * If the current head is preceded by a \flexa and succeded by a
518 * \pes (e.g. "a \flexa g \pes a"), then join the current head and
519 * the previous head into a single curved flexa shape.
521 if ((context_info & FLEXA_RIGHT) && (context_info & PES_LOWER))
523 check_for_prefix_loss (prev_primitive);
524 prev_glyph_name = "flexa";
525 prev_primitive->set_property ("flexa-height",
526 scm_from_int (prev_delta_pitch));
527 prev_primitive->set_property ("flexa-width",
528 scm_from_double (flexa_width));
529 bool add_cauda = !(prev_prefix_set && PES_OR_FLEXA);
530 prev_primitive->set_property ("add-cauda",
531 ly_bool2scm (add_cauda));
532 check_for_prefix_loss (primitive);
534 primitive->set_property ("flexa-width",
535 scm_from_double (flexa_width));
539 * Exceptional rule for pes:
541 * If this head is stacked on the previous one due to a \pes, then
542 * set the glyph of the previous head to that for this special
543 * case, thereby avoiding potential vertical collision with the
546 if (prefix_set & PES_OR_FLEXA)
548 if ((context_info & PES_UPPER) && (context_info & STACKED_HEAD))
550 if (!String::compare (prev_glyph_name, "svaticana.punctum"))
551 if (prev_delta_pitch > 1)
552 prev_glyph_name = "svaticana.lpes";
554 prev_glyph_name = "svaticana.vlpes";
559 prev_primitive->set_property ("glyph-name",
560 scm_makfrom0str (prev_glyph_name.to_str0 ()));
563 * In the backend, flexa shapes and joins need to know about line
564 * thickness. Hence, for simplicity, let's distribute the
565 * ligature grob's value for thickness to each ligature head (even
566 * if not all of them need to know).
568 primitive->set_property ("thickness", scm_from_double (thickness));
570 prev_primitive = primitive;
571 prev_prefix_set = prefix_set;
572 prev_context_info = context_info;
573 prev_delta_pitch = delta_pitch;
574 prev_glyph_name = glyph_name;
577 prev_primitive->set_property ("glyph-name",
578 scm_makfrom0str (prev_glyph_name.to_str0 ()));
580 align_heads (primitives, flexa_width, thickness);
582 #if 0 // experimental code to collapse spacing after ligature
583 /* TODO: set to max (old/new spacing-increment), since other
584 voices/staves also may want to set this property. */
585 Item *first_primitive = dynamic_cast<Item *> (primitives[0].grob ());
586 Paper_column *paper_column = first_primitive->get_column ();
587 paper_column->warning (_f ("Vaticana_ligature_engraver: "
588 "setting `spacing-increment = %f': ptr =%ul",
589 ligature_width, paper_column));
591 set_property ("forced-spacing", scm_from_double (ligature_width));
595 ADD_ACKNOWLEDGER (Vaticana_ligature_engraver, rest);
596 ADD_ACKNOWLEDGER (Vaticana_ligature_engraver, note_head);
597 ADD_TRANSLATOR (Vaticana_ligature_engraver,
598 /* doc */ "Handles ligatures by glueing special ligature heads together.",
599 /* create */ "VaticanaLigature",
600 /* accept */ "ligature-event",