From f10ddb8dd870fd691c8876c1c7151e607aab0625 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Thu, 5 May 2022 11:21:24 -0600
Subject: [PATCH] [cmap] Use -1 as Unicode sentinel, not U+FFFF in Format12
 serialize

---
 src/hb-ot-cmap-table.hh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/hb-ot-cmap-table.hh b/src/hb-ot-cmap-table.hh
index 5ea6677fe..d050b2ff7 100644
--- a/src/hb-ot-cmap-table.hh
+++ b/src/hb-ot-cmap-table.hh
@@ -798,12 +798,12 @@ struct CmapSubtableFormat12 : CmapSubtableLongSegmented<CmapSubtableFormat12>
     unsigned table_initpos = c->length ();
     if (unlikely (!c->extend_min (this))) return;
 
-    hb_codepoint_t startCharCode = 0xFFFF, endCharCode = 0xFFFF;
+    hb_codepoint_t startCharCode = (hb_codepoint_t) -1, endCharCode = (hb_codepoint_t) -1;
     hb_codepoint_t glyphID = 0;
 
     for (const auto& _ : +it)
     {
-      if (startCharCode == 0xFFFF)
+      if (startCharCode == (hb_codepoint_t) -1)
       {
 	startCharCode = _.first;
 	endCharCode = _.first;