guix/gnu/packages/patches/icecat-CVE-2015-0827-pt-2.patch

From 5ff75fbe51d5760a96b4e614617c9cbf35f1fbaa Mon Sep 17 00:00:00 2001
From: Markus Stange <mstange@themasta.com>
Date: Mon, 5 Jan 2015 18:40:27 +0100
Subject: [PATCH] Bug 1117304 - Make sure the tile filter doesn't call CopyRect
 on surfaces with different formats. r=Bas, a=sledru

---
 gfx/2d/FilterNodeSoftware.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/gfx/2d/FilterNodeSoftware.cpp b/gfx/2d/FilterNodeSoftware.cpp
index 396d0da..10d92c6 100644
--- a/gfx/2d/FilterNodeSoftware.cpp
+++ b/gfx/2d/FilterNodeSoftware.cpp
@@ -1568,7 +1568,16 @@ FilterNodeTileSoftware::Render(const IntRect& aRect)
           return nullptr;
         }
       }
-      MOZ_ASSERT(input->GetFormat() == target->GetFormat(), "different surface formats from the same input?");
+
+      if (input->GetFormat() != target->GetFormat()) {
+        // Different rectangles of the input can have different formats. If
+        // that happens, just convert everything to B8G8R8A8.
+        target = FilterProcessing::ConvertToB8G8R8A8(target);
+        input = FilterProcessing::ConvertToB8G8R8A8(input);
+        if (MOZ2D_WARN_IF(!target) || MOZ2D_WARN_IF(!input)) {
+          return nullptr;
+        }
+      }
 
       CopyRect(input, target, srcRect - srcRect.TopLeft(), destRect.TopLeft() - aRect.TopLeft());
     }
-- 
2.2.1