[pango/pango-1-44: 17/31] Speed up font format filtering

[Matthias Clasen <matthiasc src gnome org>]

commit c1821251e368025c5a7dea751e6be7d4cd8c1d4e
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Aug 15 15:28:40 2020 -0400

    Speed up font format filtering
    
    We were needlessly duplicating patters when we
    could have just referenced them.
    
    (cherry-picked from commit e9703ea3)

 pango/pangofc-fontmap.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/pango/pangofc-fontmap.c b/pango/pangofc-fontmap.c
index ade3cffc..a3440673 100644
--- a/pango/pangofc-fontmap.c
+++ b/pango/pangofc-fontmap.c
@@ -839,7 +839,10 @@ filter_fontset_by_format (FcFontSet *fontset)
   for (i = 0; i < fontset->nfont; i++)
     {
       if (pango_fc_is_supported_font_format (fontset->fonts[i]))
-        FcFontSetAdd (result, FcPatternDuplicate (fontset->fonts[i]));
+        {
+          FcPatternReference (fontset->fonts[i]);
+          FcFontSetAdd (result, fontset->fonts[i]);
+        }
     }
 
   return result;