Revert of Cleanup: Remove unneeded SSE2 checks and unused code.

media/base/simd/convert_yuv_to_rgb_x86.cc

 // Copyright (c) 2012 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.
 
 #if defined(_MSC_VER)
 #include <intrin.h>
 #else
 #include <mmintrin.h>
 #endif
 
 #include "media/base/simd/convert_yuv_to_rgb.h"
 #include "media/base/simd/yuv_to_rgb_table.h"
 #include "media/base/yuv_convert.h"
 
 namespace media {
 
+void ConvertYUVToRGB32_MMX(const uint8* yplane,
+                           const uint8* uplane,
+                           const uint8* vplane,
+                           uint8* rgbframe,
+                           int width,
+                           int height,
+                           int ystride,
+                           int uvstride,
+                           int rgbstride,
+                           YUVType yuv_type) {
+  unsigned int y_shift = GetVerticalShift(yuv_type);
+  for (int y = 0; y < height; ++y) {
+    uint8* rgb_row = rgbframe + y * rgbstride;
+    const uint8* y_ptr = yplane + y * ystride;
+    const uint8* u_ptr = uplane + (y >> y_shift) * uvstride;
+    const uint8* v_ptr = vplane + (y >> y_shift) * uvstride;
+
+    ConvertYUVToRGB32Row_MMX(y_ptr,
+                             u_ptr,
+                             v_ptr,
+                             rgb_row,
+                             width,
+                             GetLookupTable(yuv_type));
+  }
+
+  EmptyRegisterState();
+}
+
 void ConvertYUVAToARGB_MMX(const uint8* yplane,
                            const uint8* uplane,
                            const uint8* vplane,
                            const uint8* aplane,
                            uint8* rgbframe,
                            int width,
                            int height,
                            int ystride,
                            int uvstride,
                            int astride,
@@ skipping 41 matching lines @@
                              v_ptr,
                              rgb_row,
                              width,
                              GetLookupTable(yuv_type));
   }
 
   EmptyRegisterState();
 }
 
 }  // namespace media