+ LY_ASSERT_SMOB (Output_def, def, 1);
+
+ Output_def *paper = Output_def::unsmob (def);
+ Font_metric *fm = select_font (paper, chain);
+ return fm->self_scm ();
+}
+
+LY_DEFINE (ly_paper_get_number, "ly:paper-get-number",
+ 2, 0, 0, (SCM def, SCM sym),
+ "Return the value of variable @var{sym} in output definition"
+ " @var{def} as a double.")
+{
+ LY_ASSERT_SMOB (Output_def, def, 1);
+ Output_def *layout = Output_def::unsmob (def);
+ return scm_from_double (layout->get_dimension (sym));
+}
+
+LY_DEFINE (ly_paper_fonts, "ly:paper-fonts",
+ 1, 0, 0, (SCM def),
+ "Return a list containing the fonts from output definition"
+ " @var{def} (e.g., @code{\\paper}).")
+{
+ LY_ASSERT_SMOB (Output_def, def, 1);
+ Output_def *b = Output_def::unsmob (def);
+
+ SCM tab1 = b->lookup_variable (ly_symbol2scm ("scaled-fonts"));
+ SCM tab2 = b->lookup_variable (ly_symbol2scm ("pango-fonts"));
+
+ SCM alist1 = SCM_EOL;
+ if (scm_hash_table_p (tab1) == SCM_BOOL_T)
+ {
+ alist1 = scm_append (ly_alist_vals (ly_hash2alist (tab1)));
+
+ alist1 = ly_alist_vals (alist1);
+ }
+
+ SCM alist2 = SCM_EOL;
+ if (scm_hash_table_p (tab2) == SCM_BOOL_T)
+ {
+ // strip original-fonts/pango-font-descriptions
+ alist2 = scm_append (ly_alist_vals (ly_hash2alist (tab2)));
+
+ // strip size factors
+ alist2 = ly_alist_vals (alist2);
+ }
+
+ SCM alist = scm_append (scm_list_2 (alist1, alist2));
+ SCM font_list = SCM_EOL;
+ for (SCM s = alist; scm_is_pair (s); s = scm_cdr (s))
+ {
+ SCM entry = scm_car (s);
+
+ Font_metric *fm = Font_metric::unsmob (entry);
+
+ if (dynamic_cast<Modified_font_metric *> (fm)
+ || dynamic_cast<Pango_font *> (fm))
+ font_list = scm_cons (fm->self_scm (), font_list);
+ }
+
+ return font_list;