From 489acf6c3180d3726158864fa0e1adeea3c23fae Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Fri, 22 Jul 2016 17:41:43 -0700
Subject: [PATCH] [coretext] "Fix" crashes on CoreText < 10.10

Fixes https://github.com/behdad/harfbuzz/issues/297
---
 src/hb-coretext.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/hb-coretext.cc b/src/hb-coretext.cc
index f4d9716e9..c50537341 100644
--- a/src/hb-coretext.cc
+++ b/src/hb-coretext.cc
@@ -145,6 +145,14 @@ create_ct_font (CGFontRef cg_font, CGFloat font_size)
     DEBUG_MSG (CORETEXT, cg_font, "Font CTFontCreateWithGraphicsFont() failed");
     return NULL;
   }
+
+  /* crbug.com/576941 and crbug.com/625902 and the investigation in the latter
+   * bug indicate that the cascade list reconfiguration occasionally causes
+   * crashes in CoreText on OS X 10.9, thus let's skip this step on older
+   * operating system versions. */
+  if (&CTGetCoreTextVersion != NULL && CTGetCoreTextVersion() < kCTVersionNumber10_10)
+    return ct_font;
+
   CFURLRef original_url = (CFURLRef)CTFontCopyAttribute(ct_font, kCTFontURLAttribute);
 
   /* Create font copy with cascade list that has LastResort first; this speeds up CoreText