From d5c36a98971ab52d40c183a7e139bce99f4ef2a3 Mon Sep 17 00:00:00 2001
From: "mark%moxienet.com"
 <mark%moxienet.com@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Thu, 6 Apr 2006 20:11:09 +0000
Subject: [PATCH] 332704 Divide-by-zero causes crash on x86 Mac when viewing
 SVG.  Check for /0.  r=jhpedemonte r=vlad sr=shaver

git-svn-id: svn://10.0.0.236/trunk@193728 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/gfx/src/mac/nsImageMac.cpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/mozilla/gfx/src/mac/nsImageMac.cpp b/mozilla/gfx/src/mac/nsImageMac.cpp
index 72932bfe9c7..e8b0712e131 100644
--- a/mozilla/gfx/src/mac/nsImageMac.cpp
+++ b/mozilla/gfx/src/mac/nsImageMac.cpp
@@ -579,9 +579,17 @@ nsImageMac::LockImagePixels(PRBool aMaskPixels)
           PRUint8 alpha = *tmp++;
           mAlphaBits[alphaRowStart + x] = alpha;
           PRUint32 offset = rowStart + COMPS_PER_PIXEL * x;
-          mImageBits[offset + 1] = ((PRUint32) *tmp++) * 255 / alpha;
-          mImageBits[offset + 2] = ((PRUint32) *tmp++) * 255 / alpha;
-          mImageBits[offset + 3] = ((PRUint32) *tmp++) * 255 / alpha;
+          if (alpha) {
+            mImageBits[offset + 1] = ((PRUint32) *tmp++) * 255 / alpha;
+            mImageBits[offset + 2] = ((PRUint32) *tmp++) * 255 / alpha;
+            mImageBits[offset + 3] = ((PRUint32) *tmp++) * 255 / alpha;
+          }
+          else {
+            tmp += 3;
+            mImageBits[offset + 1] =
+             mImageBits[offset + 2] =
+             mImageBits[offset + 3] = 0;
+          }
         }
       }
       break;