lily/paper-def.cc

   1 /*
   2   paper-def.cc -- implement Paper_def
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #include <math.h>
  11
  12 #include "virtual-font-metric.hh"
  13 #include "all-font-metrics.hh"
  14 #include "string.hh"
  15 #include "misc.hh"
  16 #include "paper-def.hh"
  17 #include "warn.hh"
  18 #include "scaled-font-metric.hh"
  19 #include "main.hh"
  20 #include "scm-hash.hh"
  21 #include "input-file-results.hh" // urg? header_global
  22 #include "paper-outputter.hh"
  23 #include "ly-module.hh"
  24
  25 /*
  26   This is an almost empty thing. The only substantial thing this class
  27   handles is scaling up and down to real-world dimensions (internally
  28   dimensions are against global staff-space.)
  29  */
  30
  31 Paper_def::Paper_def ()
  32 {
  33   scaled_fonts_ = SCM_EOL;
  34   /*
  35     don't remove above statement,  scm_make_hash_table may trigger GC.
  36    */
  37   scaled_fonts_ = scm_c_make_hash_table (11);
  38 }
  39
  40 Paper_def::~Paper_def ()
  41 {
  42 }
  43
  44 Paper_def::Paper_def (Paper_def const&src)
  45   : Music_output_def (src)
  46 {
  47   scaled_fonts_ = SCM_EOL;
  48   /*
  49     don't remove above statement,  scm_make_hash_table may trigger GC.
  50    */
  51   scaled_fonts_ = scm_c_make_hash_table (11);
  52 }
  53
  54 void
  55 Paper_def::derived_mark ()
  56 {
  57   scm_gc_mark (scaled_fonts_);
  58 }
  59
  60 Real
  61 Paper_def::get_dimension (SCM s) const
  62 {
  63   SCM val = lookup_variable (s);
  64   SCM scale = lookup_variable (ly_symbol2scm ("outputscale"));
  65
  66   Real sc = ly_scm2double (scale);
  67   return ly_scm2double (val) / sc;
  68 }
  69
  70 /*
  71   FIXME. This is broken until we have a generic way of
  72   putting lists inside the \paper block.
  73  */
  74 Interval
  75 Paper_def::line_dimensions_int (int n) const
  76 {
  77   Real lw =  get_dimension (ly_symbol2scm ("linewidth"));
  78   Real ind = n? 0.0:get_dimension (ly_symbol2scm ("indent"));
  79
  80   return Interval (ind, lw);
  81 }
  82
  83
  84
  85
  86 Paper_outputter*
  87 Paper_def::get_paper_outputter (String outname)  const
  88 {
  89   progress_indication (_f ("paper output to `%s'...",
  90                            outname == "-" ? String ("<stdout>") : outname));
  91   progress_indication("\n");
  92
  93   global_input_file->target_strings_.push (outname);
  94   Paper_outputter * po = new Paper_outputter (outname);
  95   Path p = split_path (outname);
  96   p.ext = "";
  97   po->basename_ = p.to_string ();
  98   return po;
  99 }
 100
 101
 102
 103 Font_metric *
 104 Paper_def::find_scaled_font (Font_metric *f, Real m)
 105 {
 106   SCM sizes = scm_hashq_ref (scaled_fonts_, f->self_scm (), SCM_BOOL_F);
 107   if (sizes != SCM_BOOL_F)
 108     {
 109       SCM met = scm_assoc (scm_make_real (m), sizes);
 110       if (ly_pair_p (met))
 111         return unsmob_metrics (ly_cdr (met));
 112     }
 113   else
 114     {
 115       sizes = SCM_EOL;
 116     }
 117
 118
 119   /*
 120     Hmm. We're chaining font - metrics. Should consider wether to merge
 121     virtual-font and scaled_font.
 122   */
 123   SCM val = SCM_EOL;
 124   if (Virtual_font_metric * vf = dynamic_cast<Virtual_font_metric*> (f))
 125     {
 126       /*
 127         For fontify_atom (), the magnification and name must be known
 128         at the same time. That's impossible for
 129
 130           Scaled (Virtual_font (Font1,Font2))
 131
 132         so we replace by
 133
 134           Virtual_font (Scaled (Font1), Scaled (Font2))
 135
 136        */
 137       SCM l = SCM_EOL;
 138       SCM *t =  &l;
 139       for (SCM s = vf->get_font_list (); ly_pair_p (s); s = ly_cdr (s))
 140         {
 141           Font_metric*scaled
 142             = find_scaled_font (unsmob_metrics (ly_car (s)), m);
 143           *t = scm_cons (scaled->self_scm (), SCM_EOL);
 144           t = SCM_CDRLOC(*t);
 145         }
 146
 147       vf = new Virtual_font_metric (l);
 148       val = vf->self_scm ();
 149     }
 150   else
 151     {
 152       SCM scale_var = ly_module_lookup (scope_, ly_symbol2scm ("outputscale"));
 153       SCM coding_var = ly_module_lookup (scope_, ly_symbol2scm ("inputcoding"));
 154
 155       m /= ly_scm2double (scm_variable_ref (scale_var));
 156       val = Modified_font_metric::make_scaled_font_metric (scm_variable_ref (coding_var),
 157                                                            f, m);
 158     }
 159
 160   sizes = scm_acons (scm_make_real (m), val, sizes);
 161   scm_gc_unprotect_object (val);
 162
 163   scm_hashq_set_x (scaled_fonts_, f->self_scm (), sizes);
 164
 165   return unsmob_metrics (val);
 166 }
 167
 168
 169
 170 /*
 171   Return alist to translate internally used fonts back to real-world
 172   coordinates.  */
 173 SCM
 174 Paper_def::font_descriptions () const
 175 {
 176   SCM func = ly_scheme_function ("hash-table->alist");
 177
 178   SCM l = SCM_EOL;
 179   for (SCM s = scm_call_1 (func, scaled_fonts_); ly_pair_p (s); s = ly_cdr (s))
 180     {
 181       SCM entry = ly_car (s);
 182       for (SCM t = ly_cdr (entry); ly_pair_p (t); t  = ly_cdr (t))
 183         {
 184           Font_metric *fm= unsmob_metrics (ly_cdar (t));
 185
 186           if (dynamic_cast<Modified_font_metric*> (fm))
 187             l = scm_cons (fm->self_scm (), l);
 188         }
 189     }
 190   return l;
 191 }
 192
 193 Paper_def*
 194 unsmob_paper (SCM x)
 195 {
 196   return dynamic_cast<Paper_def*> (unsmob_music_output_def (x));
 197 }
 198
 199
 200 LY_DEFINE (ly_paper_def_p, "ly:paper-def?",
 201            1, 0,0, (SCM def),
 202            "Is @var{def} a paper definition?")
 203 {
 204   Paper_def *op = dynamic_cast<Paper_def*> (unsmob_music_output_def (def));
 205
 206   bool pap = op;
 207   return ly_bool2scm (pap);
 208 }