From 625678436c29100eef82d87e635b251030a18f60 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Mon, 5 Aug 2013 22:44:18 -0400
Subject: [PATCH] Fix glyph closure with class==0

As reported by cibu.  Untested.
---
 src/hb-ot-layout-common-private.hh | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/src/hb-ot-layout-common-private.hh b/src/hb-ot-layout-common-private.hh
index 5196e60ac..86224a15e 100644
--- a/src/hb-ot-layout-common-private.hh
+++ b/src/hb-ot-layout-common-private.hh
@@ -955,6 +955,19 @@ struct ClassDefFormat1
 
   inline bool intersects_class (const hb_set_t *glyphs, unsigned int klass) const {
     unsigned int count = classValue.len;
+    if (klass == 0)
+    {
+      /* Match if there's any glyph that is not listed! */
+      hb_codepoint_t g = -1;
+      if (!hb_set_next (glyphs, &g))
+        return false;
+      if (g < startGlyph)
+        return true;
+      g = startGlyph + count - 1;
+      if (hb_set_next (glyphs, &g))
+        return true;
+      /* Fall through. */
+    }
     for (unsigned int i = 0; i < count; i++)
       if (classValue[i] == klass && glyphs->has (startGlyph + i))
         return true;
@@ -998,6 +1011,22 @@ struct ClassDefFormat2
 
   inline bool intersects_class (const hb_set_t *glyphs, unsigned int klass) const {
     unsigned int count = rangeRecord.len;
+    if (klass == 0)
+    {
+      /* Match if there's any glyph that is not listed! */
+      hb_codepoint_t g = -1;
+      for (unsigned int i = 0; i < count; i++)
+      {
+	if (!hb_set_next (glyphs, &g))
+	  break;
+	if (g < rangeRecord[i].start)
+	  return true;
+	g = rangeRecord[i].end;
+      }
+      if (g != -1 && hb_set_next (glyphs, &g))
+        return true;
+      /* Fall through. */
+    }
     for (unsigned int i = 0; i < count; i++)
       if (rangeRecord[i].value == klass && rangeRecord[i].intersects (glyphs))
         return true;