From 02b75fbdaf1cdfbbd4c743d80284943682964003 Mon Sep 17 00:00:00 2001
From: Nicolas Silva <nsilva@mozilla.com>
Date: Fri, 3 Oct 2014 11:25:07 +0200
Subject: [PATCH] Bug 1073113 - make D3D11 image layers double buffered.
 r=mattwoodrow

---
 gfx/layers/client/ClientImageLayer.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gfx/layers/client/ClientImageLayer.cpp b/gfx/layers/client/ClientImageLayer.cpp
index 06fed07e04aa..d82252292ac2 100644
--- a/gfx/layers/client/ClientImageLayer.cpp
+++ b/gfx/layers/client/ClientImageLayer.cpp
@@ -105,6 +105,13 @@ protected:
       return mImageClientTypeContainer;
     }
 
+    // Since D3D11 TextureClient doesn't have an internal buffer, modifying the
+    // front buffer directly may break the transactional property of layer updates.
+    if (ClientManager()->GetCompositorBackendType() == LayersBackend::LAYERS_D3D11) {
+      mImageClientTypeContainer = CompositableType::BUFFER_IMAGE_BUFFERED;
+      return mImageClientTypeContainer;
+    }
+
     AutoLockImage autoLock(mContainer);
 
 #ifdef MOZ_WIDGET_GONK