[pango] [win32] Fix assertion and warnings

[Behdad Esfahbod <behdad src gnome org>]

commit 0654dfb2ddc66fe70cd5582ccc0ec08ba8154ac6
Author: Behdad Esfahbod <behdad behdad org>
Date:   Mon Feb 25 23:37:16 2013 -0500

    [win32] Fix assertion and warnings
    
    When win32 fontmap goes away, font->fontmap becomes NULL.  Deal
    with that.  Technically speaking, we need to port this to GWeakRef
    like the other fontmaps do.  But this would do for now.

 pango/pangowin32-fontmap.c |    4 +++-
 pango/pangowin32.c         |   12 +++++++++---
 2 files changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/pango/pangowin32-fontmap.c b/pango/pangowin32-fontmap.c
index 5dc2a82..460afb2 100644
--- a/pango/pangowin32-fontmap.c
+++ b/pango/pangowin32-fontmap.c
@@ -1701,7 +1701,9 @@ pango_win32_face_get_type (void)
 PangoWin32FontCache *
 pango_win32_font_map_get_font_cache (PangoFontMap *font_map)
 {
-  g_return_val_if_fail (font_map != NULL, NULL);
+  if (G_UNLIKELY (!font_map))
+    return NULL;
+
   g_return_val_if_fail (PANGO_WIN32_IS_FONT_MAP (font_map), NULL);
 
   return PANGO_WIN32_FONT_MAP (font_map)->font_cache;
diff --git a/pango/pangowin32.c b/pango/pangowin32.c
index a159426..8678ebb 100644
--- a/pango/pangowin32.c
+++ b/pango/pangowin32.c
@@ -93,6 +93,8 @@ _pango_win32_font_get_hfont (PangoFont *font)
   if (!win32font->hfont)
     {
       cache = pango_win32_font_map_get_font_cache (win32font->fontmap);
+      if (G_UNLIKELY (!cache))
+        return NULL;
 
       win32font->hfont = pango_win32_font_cache_loadw (cache, &win32font->logfontw);
       if (!win32font->hfont)
@@ -816,6 +818,8 @@ pango_win32_font_finalize (GObject *object)
 {
   PangoWin32Font *win32font = (PangoWin32Font *)object;
   PangoWin32FontCache *cache = pango_win32_font_map_get_font_cache (win32font->fontmap);
+  if (G_UNLIKELY (!cache))
+    return NULL;
 
   if (win32font->hfont != NULL)
     pango_win32_font_cache_unload (cache, win32font->hfont);
@@ -828,9 +832,11 @@ pango_win32_font_finalize (GObject *object)
 
   g_hash_table_destroy (win32font->glyph_info);
 
-  g_assert (win32font->fontmap != NULL);
-  g_object_remove_weak_pointer (G_OBJECT (win32font->fontmap), (gpointer *) (gpointer) &win32font->fontmap);
-  win32font->fontmap = NULL;
+  if (win32font->fontmap)
+  {
+    g_object_remove_weak_pointer (G_OBJECT (win32font->fontmap), (gpointer *) (gpointer) 
&win32font->fontmap);
+    win32font->fontmap = NULL;
+  }
 
   G_OBJECT_CLASS (_pango_win32_font_parent_class)->finalize (object);
 }