From c0689e1446cec698727e2377a2bf77b6c1a37d10 Mon Sep 17 00:00:00 2001
From: Bas Schouten <bschouten@mozilla.com>
Date: Tue, 28 Feb 2012 04:02:21 +0100
Subject: [PATCH] Bug 729116: Try our best to have a valid mTarget even when
 having an invalid context. r=joe

---
 content/canvas/src/nsCanvasRenderingContext2DAzure.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/content/canvas/src/nsCanvasRenderingContext2DAzure.cpp b/content/canvas/src/nsCanvasRenderingContext2DAzure.cpp
index 0f4c4390ca4..c96362ab625 100644
--- a/content/canvas/src/nsCanvasRenderingContext2DAzure.cpp
+++ b/content/canvas/src/nsCanvasRenderingContext2DAzure.cpp
@@ -1306,6 +1306,10 @@ nsCanvasRenderingContext2DAzure::InitializeWithTarget(DrawTarget *target, PRInt3
     mTarget = target;
   } else {
     mValid = false;
+    // Create a dummy target in the hopes that it will help us deal with users
+    // calling into us after having changed the size where the size resulted
+    // in an inability to create a correct DrawTarget.
+    mTarget = gfxPlatform::GetPlatform()->CreateOffscreenDrawTarget(IntSize(1, 1), FORMAT_B8G8R8A8);
   }
 
   mResetLayer = true;