[pango/pango2: 160/201] hbfontmap: Don't return duplicate fonts

[Matthias Clasen <matthiasc src gnome org>]

commit 2601a108e57e20602e7fb72e7e4b9e560afa6ecf
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jun 5 01:36:26 2022 -0400

    hbfontmap: Don't return duplicate fonts
    
    For generic families, we want to avoid returning
    a new copy of the same font for every char we
    try. Otherwise, we end up with single-char runs,
    since itemizations relies on comparing fonts by
    pointer.

 pango/pango-hbfontmap.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)
---
diff --git a/pango/pango-hbfontmap.c b/pango/pango-hbfontmap.c
index 89f80a30..99b5ecdb 100644
--- a/pango/pango-hbfontmap.c
+++ b/pango/pango-hbfontmap.c
@@ -196,10 +196,24 @@ pango_fontset_cached_get_font (PangoFontset *fontset,
                                                  wc);
           if (face)
             {
-              retval = pango_font_face_create_font (face,
-                                                    self->description,
-                                                    self->dpi,
-                                                    self->matrix);
+              GHashTableIter iter;
+              PangoFont *font;
+
+              g_hash_table_iter_init (&iter, self->cache);
+              while (g_hash_table_iter_next (&iter, NULL, (gpointer *)&font))
+                {
+                  if (pango_font_get_face (font) == face)
+                    {
+                      retval = g_object_ref (font);
+                      break;
+                    }
+                }
+
+              if (!retval)
+                retval = pango_font_face_create_font (face,
+                                                      self->description,
+                                                      self->dpi,
+                                                      self->matrix);
               break;
             }
         }