From ff6c421be00223c13d8b2cd43e91557a2437c93a Mon Sep 17 00:00:00 2001
From: Lee Salzman <lsalzman@mozilla.com>
Date: Thu, 26 Apr 2018 11:38:09 -0400
Subject: [PATCH] Bug 1448703 - follow-up - disambiguate unknown font from
 cleared all. r=me

---
 gfx/webrender_bindings/Moz2DImageRenderer.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gfx/webrender_bindings/Moz2DImageRenderer.cpp b/gfx/webrender_bindings/Moz2DImageRenderer.cpp
index 340522b8edef..6ee0c0989b42 100644
--- a/gfx/webrender_bindings/Moz2DImageRenderer.cpp
+++ b/gfx/webrender_bindings/Moz2DImageRenderer.cpp
@@ -89,7 +89,7 @@ static struct FontDeleteLog {
   }
 
   void AddAll() {
-    AddEntry(0);
+    AddEntry(~0);
   }
 
   // Find a matching entry in the log, searching backwards starting at the newest
@@ -105,7 +105,7 @@ static struct FontDeleteLog {
         return "deleted font";
       } else if (mEntries[offset] == namespaceEntry) {
         return "cleared namespace";
-      } else if (!mEntries[offset]) {
+      } else if (mEntries[offset] == ~0) {
         return "cleared all";
       }
     } while (offset != mNextEntry);