[pango] coretext: use public function to obtain cascade list if available

[Kristian Rietveld <kristian src gnome org>]

commit 61dd7da69458e8443343eb71d7336b458f834700
Author: Kristian Rietveld <kris loopnest org>
Date:   Sun Apr 26 23:15:19 2015 +0200

    coretext: use public function to obtain cascade list if available
    
    We use a compile-time check: if compiling for platforms 10.8 or higher,
    use the public function, otherwise use the undocumented function.
    
    Fixes bug 737813.

 pango/pangocoretext-fontmap.c |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)
---
diff --git a/pango/pangocoretext-fontmap.c b/pango/pangocoretext-fontmap.c
index 159bedb..65be356 100644
--- a/pango/pangocoretext-fontmap.c
+++ b/pango/pangocoretext-fontmap.c
@@ -1522,10 +1522,12 @@ G_DEFINE_TYPE (PangoCoreTextFontset,
                pango_core_text_fontset,
                PANGO_TYPE_FONTSET);
 
+#if !defined(MAC_OS_X_VERSION_10_8) || MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_8
 /* This symbol does exist in the CoreText library shipped with Snow
  * Leopard and Lion, however, it is not found in the public header files.
  */
 CFArrayRef CTFontCopyDefaultCascadeList (CTFontRef font_ref);
+#endif
 
 static PangoCoreTextFontset *
 pango_core_text_fontset_new (PangoCoreTextFontsetKey    *key,
@@ -1589,7 +1591,28 @@ pango_core_text_fontset_new (PangoCoreTextFontsetKey    *key,
   fontset->coverages = g_ptr_array_new ();
 
   /* Add the cascade list for this language */
+#if defined(MAC_OS_X_VERSION_10_8) && MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_8
+    {
+      CFArrayRef language_pref_list;
+      CFStringRef languages[1];
+
+      languages[0] = CFStringCreateWithCString (NULL,
+                                                pango_language_to_string (key->language),
+                                                kCFStringEncodingASCII);
+      language_pref_list = CFArrayCreate (kCFAllocatorDefault,
+                                          (const void **) languages,
+                                          1,
+                                          &kCFTypeArrayCallBacks);
+      fontset->cascade_list = CTFontCopyDefaultCascadeListForLanguages (pango_core_text_font_get_ctfont 
(best_font), language_pref_list);
+      CFRelease (languages[0]);
+      CFRelease (language_pref_list);
+    }
+#else
+  /* There is unfortunately no public API to retrieve the cascade list
+   * on Mac OS X < 10.8, so we use the following undocumented public function.
+   */
   fontset->cascade_list = CTFontCopyDefaultCascadeList (pango_core_text_font_get_ctfont (best_font));
+#endif
 
   /* length of cascade list + 1 for the "real" font at the front */
   g_ptr_array_set_size (fontset->fonts, CFArrayGetCount (fontset->cascade_list) + 1);