2 paper-def.cc -- implement Paper_def
4 source file of the GNU LilyPond music typesetter
6 (c) 2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "dimensions.hh"
10 #include "output-def.hh"
11 #include "modified-font-metric.hh"
12 #include "pango-font.hh"
15 output_scale (Output_def *od)
17 return scm_to_double (od->lookup_variable (ly_symbol2scm ("outputscale")));
22 get_font_table (Output_def *def)
24 SCM font_table = def->lookup_variable (ly_symbol2scm ("scaled-fonts"));
25 if (scm_hash_table_p (font_table) != SCM_BOOL_T)
27 font_table = scm_c_make_hash_table (11);
28 def->set_variable (ly_symbol2scm ("scaled-fonts"), font_table);
35 /* TODO: should add nesting for Output_def here too. */
37 find_scaled_font (Output_def *mod, Font_metric *f, Real m)
40 return find_scaled_font (mod->parent_, f, m);
42 Real lookup_mag = m / output_scale (mod);
44 SCM font_table = get_font_table (mod);
45 SCM sizes = scm_hashq_ref (font_table, f->self_scm (), SCM_BOOL_F);
46 if (sizes != SCM_BOOL_F)
48 SCM met = scm_assoc (scm_make_real (lookup_mag), sizes);
49 if (scm_is_pair (met))
50 return unsmob_metrics (scm_cdr (met));
55 SCM val = Modified_font_metric::make_scaled_font_metric (f, lookup_mag);
57 sizes = scm_acons (scm_make_real (lookup_mag), val, sizes);
58 scm_gc_unprotect_object (val);
59 scm_hashq_set_x (font_table, f->self_scm (), sizes);
60 return unsmob_metrics (val);
63 /* TODO: this is a nasty interface. During formatting,
64 the Output_def should be scaled to the output_scale_
65 specified in the toplevel Output_def. */
67 scale_output_def (Output_def *o, Real amount)
69 SCM proc = ly_lily_module_constant ("scale-layout");
70 SCM new_pap = scm_call_2 (proc, o->self_scm (), scm_double2num (amount));
71 scm_gc_protect_object (new_pap);
73 return unsmob_output_def (new_pap);
76 LY_DEFINE (ly_paper_fonts, "ly:paper-fonts",
79 "Return fonts from the @code{\\paper} block @var{bp}.")
81 Output_def *b = unsmob_output_def (bp);
83 SCM font_table = b->lookup_variable (ly_symbol2scm ("scaled-fonts"));
85 SCM_ASSERT_TYPE (b, bp, SCM_ARG1, __FUNCTION__, "paper");
88 if (scm_hash_table_p (font_table) == SCM_BOOL_T)
90 SCM func = ly_lily_module_constant ("hash-table->alist");
92 for (SCM s = scm_call_1 (func, font_table); scm_is_pair (s);
95 SCM entry = scm_car (s);
96 for (SCM t = scm_cdr (entry); scm_is_pair (t); t = scm_cdr (t))
98 Font_metric *fm = unsmob_metrics (scm_cdar (t));
100 if (dynamic_cast<Modified_font_metric*> (fm)
101 || dynamic_cast<Pango_font*> (fm))
102 ell = scm_cons (fm->self_scm (), ell);