From dfd234a97d2e2f9908eaf0598de765f76ba86c82 Mon Sep 17 00:00:00 2001
From: Jonathan Kew <jfkthame@gmail.com>
Date: Thu, 26 Oct 2017 16:59:50 +0100
Subject: [PATCH] [set] Fix page_map[] indexing in backward loop.

Fixes https://github.com/behdad/harfbuzz/issues/579.
---
 src/hb-set-private.hh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/hb-set-private.hh b/src/hb-set-private.hh
index df4325afd..c970b89dd 100644
--- a/src/hb-set-private.hh
+++ b/src/hb-set-private.hh
@@ -313,13 +313,13 @@ struct hb_set_t
     b = nb;
     for (; a && b; )
     {
-      if (page_map[a].major == other->page_map[b].major)
+      if (page_map[a - 1].major == other->page_map[b - 1].major)
       {
 	a--;
 	b--;
         Op::process (page_at (--count).v, page_at (a).v, other->page_at (b).v);
       }
-      else if (page_map[a].major > other->page_map[b].major)
+      else if (page_map[a - 1].major > other->page_map[b - 1].major)
       {
         a--;
         if (Op::passthru_left)