X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fopen-type-font-scheme.cc;h=d39a7cc9d8573885168280e29978c081fc86c8f8;hb=459216bffe7aa64cd1e9f31f1fda28f90f6e9c1c;hp=147320521004d006052c76e1a9ebd50c4a61291e;hpb=1dd803cf0f3ed07a0e9e8b49dd66b84152c64b27;p=lilypond.git

diff --git a/lily/open-type-font-scheme.cc b/lily/open-type-font-scheme.cc
index 1473205210..d39a7cc9d8 100644
--- a/lily/open-type-font-scheme.cc
+++ b/lily/open-type-font-scheme.cc
@@ -35,10 +35,10 @@ LY_DEFINE (ly_otf_font_glyph_info, "ly:otf-font-glyph-info", 2, 0, 0,
   return scm_hashq_ref (otf->get_char_table (), sym, SCM_EOL);
 }
 
-
 LY_DEFINE(ly_otf_font_table_data, "ly:otf-font-table-data", 2, 0, 0,
 	  (SCM font, SCM tag),
-	  "Extract a table @var{tag} from @var{font}.")
+	  "Extract a table @var{tag} from @var{font}. Return empty string for "
+	  "non-existent @var{tag}.")
 {
   Modified_font_metric *fm
     = dynamic_cast<Modified_font_metric *> (unsmob_metrics (font));
@@ -46,7 +46,6 @@ LY_DEFINE(ly_otf_font_table_data, "ly:otf-font-table-data", 2, 0, 0,
   Open_type_font *otf = fm ? dynamic_cast<Open_type_font *> (fm->original_font ())
     : dynamic_cast<Open_type_font *> (unsmob_metrics (font));
 
-
   SCM_ASSERT_TYPE (otf, font, SCM_ARG1,  __FUNCTION__, "Open type font");
   SCM_ASSERT_TYPE (scm_is_string (tag), tag, SCM_ARG1,  __FUNCTION__, "Open type font");
 
@@ -59,3 +58,16 @@ LY_DEFINE(ly_otf_font_table_data, "ly:otf-font-table-data", 2, 0, 0,
 
   return scm_from_locale_stringn ((char const*) tab.to_bytes (), tab.length ());
 }
+
+LY_DEFINE(ly_otf_font_p, "ly:otf-font?", 1, 0, 0,
+	  (SCM font),
+	  "Is @var{font} an OpenType font?")
+{
+  Modified_font_metric *fm
+    = dynamic_cast<Modified_font_metric *> (unsmob_metrics (font));
+  
+  Open_type_font *otf = fm ? dynamic_cast<Open_type_font *> (fm->original_font ())
+    : dynamic_cast<Open_type_font *> (unsmob_metrics (font));
+
+  return scm_from_bool (otf);
+}