[pango] Port PangoWin32 to use GWeakRef

[Behdad Esfahbod <behdad src gnome org>]

commit 16e4dd37e5fdd231a32bba6a1238ff01408c783d
Author: Behdad Esfahbod <behdad behdad org>
Date:   Fri Mar 15 05:57:52 2013 -0400

    Port PangoWin32 to use GWeakRef
    
    Patch from Chun-wei Fan.

 pango/pangowin32-fontmap.c |    8 ++++----
 pango/pangowin32.c         |   12 ++++++------
 2 files changed, 10 insertions(+), 10 deletions(-)
---
diff --git a/pango/pangowin32-fontmap.c b/pango/pangowin32-fontmap.c
index 460afb2..eb54e61 100644
--- a/pango/pangowin32-fontmap.c
+++ b/pango/pangowin32-fontmap.c
@@ -678,7 +678,7 @@ pango_win32_font_map_fontset_add_fonts (PangoFontMap          *fontmap,
   /* Mostly use the "old" pango_font_map_fontset_add_fonts() */
   /* on Windows so that we can go through the .aliases file */
   /* to load the appropriate fontset for various texts */
-  PangoFont *font, *result;
+  PangoFont *font;
   char **aliases;
   int n_aliases;
   int j;
@@ -989,9 +989,9 @@ pango_win32_font_neww (PangoFontMap   *fontmap,
 
   result = (PangoWin32Font *)g_object_new (PANGO_TYPE_WIN32_FONT, NULL);
 
-  g_assert (result->fontmap == NULL);
-  result->fontmap = fontmap;
-  g_object_add_weak_pointer (G_OBJECT (result->fontmap), (gpointer *) (gpointer) &result->fontmap);
+  if (G_UNLIKELY(result->fontmap))
+    return result;
+  g_weak_ref_set ((GWeakRef *)&result->fontmap, fontmap);
 
   result->size = size;
   _pango_win32_make_matching_logfontw (fontmap, lfp, size, &result->logfontw);
diff --git a/pango/pangowin32.c b/pango/pangowin32.c
index 8678ebb..bb5b975 100644
--- a/pango/pangowin32.c
+++ b/pango/pangowin32.c
@@ -818,8 +818,10 @@ pango_win32_font_finalize (GObject *object)
 {
   PangoWin32Font *win32font = (PangoWin32Font *)object;
   PangoWin32FontCache *cache = pango_win32_font_map_get_font_cache (win32font->fontmap);
+  PangoWin32Font *fontmap;
+
   if (G_UNLIKELY (!cache))
-    return NULL;
+    return;
 
   if (win32font->hfont != NULL)
     pango_win32_font_cache_unload (cache, win32font->hfont);
@@ -832,11 +834,9 @@ pango_win32_font_finalize (GObject *object)
 
   g_hash_table_destroy (win32font->glyph_info);
 
-  if (win32font->fontmap)
-  {
-    g_object_remove_weak_pointer (G_OBJECT (win32font->fontmap), (gpointer *) (gpointer) 
&win32font->fontmap);
-    win32font->fontmap = NULL;
-  }
+  fontmap = g_weak_ref_get ((GWeakRef *) &win32font->fontmap);
+  if (fontmap)
+    g_object_unref (fontmap);
 
   G_OBJECT_CLASS (_pango_win32_font_parent_class)->finalize (object);
 }