Runtime check to enable SSE2 color space conversion code

This will make text in chromoting view to looks much nicer.

BUG=72218
TEST=Text looks much better in chromoting

Review URL: http://codereview.chromium.org/6410127

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@74154 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 32 insertions, 2 deletions

diff --git a/media/base/yuv_convert.cc b/media/base/yuv_convert.cc
index bea0e50..f6e2857 100644
--- a/media/base/yuv_convert.cc
+++ b/media/base/yuv_convert.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -17,7 +17,8 @@
 
 #include "media/base/yuv_convert.h"
 
-// Header for low level row functions.
+#include "media/base/cpu_features.h"
+#include "media/base/yuv_convert_internal.h"
 #include "media/base/yuv_row.h"
 
 #if USE_MMX
@@ -343,4 +344,33 @@ void ScaleYUVToRGB32(const uint8* y_buf,
   EMMS();
 }
 
+void ConvertRGB32ToYUV(const uint8* rgbframe,
+                       uint8* yplane,
+                       uint8* uplane,
+                       uint8* vplane,
+                       int width,
+                       int height,
+                       int rgbstride,
+                       int ystride,
+                       int uvstride) {
+  static void (*convert_proc)(const uint8*, uint8*, uint8*, uint8*,
+                              int, int, int, int, int) = NULL;
+  if (!convert_proc) {
+#ifdef __arm__
+    // For ARM processors, always use C version.
+    // TODO(hclam): Implement a NEON version.
+    convert_proc = &ConvertRGB32ToYUV_C;
+#else
+    // For x86 processors, check if SSE2 is supported.
+    if (hasSSE2())
+      convert_proc = &ConvertRGB32ToYUV_SSE2;
+    else
+      convert_proc = &ConvertRGB32ToYUV_C;
+#endif
+  }
+
+  convert_proc(rgbframe, yplane, uplane, vplane, width, height,
+               rgbstride, ystride, uvstride);
+}
+
 }  // namespace media