Revert 74583 - Revert 74571 - Use SSE2 block differ for chromoting

(Quick test to see if it is the cause of crashes in media_unittests)
(Test showed this CL is not to blame)

We have the SSE2 lying around in the tree just never being used. This will
allow us to use it.

BUG=None
TEST=Chromoting to a host machine and the diff will work correctly

Review URL: http://codereview.chromium.org/6469022

TBR=hclam@chromium.org
Review URL: http://codereview.chromium.org/6488023

TBR=finnur@chromium.org

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@74588 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 25 insertions, 0 deletions

diff --git a/remoting/host/differ_block_internal.h b/remoting/host/differ_block_internal.h
new file mode 100644
index 0000000..d0ddce0
--- /dev/null
+++ b/remoting/host/differ_block_internal.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This header file is used only differ_block.h. It defines the SSE2 rountines
+// for finding block difference.
+
+#ifndef REMOTING_HOST_DIFFER_BLOCK_INTERNAL_H_
+#define REMOTING_HOST_DIFFER_BLOCK_INTERNAL_H_
+
+#include "base/basictypes.h"
+
+namespace remoting {
+
+// Find block difference of dimension 16x16.
+extern int BlockDifference_SSE2_W16(const uint8* image1, const uint8* image2,
+                                    int stride);
+
+// Find block difference of dimension 32x32.
+extern int BlockDifference_SSE2_W32(const uint8* image1, const uint8* image2,
+                                    int stride);
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_DIFFER_BLOCK_INTERNAL_H_