Adding YUVA support for enabling Alpha Playback

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
 
@@ skipping 22 matching lines @@
     ConvertYUVToRGB32Row_MMX(y_ptr,
                              u_ptr,
                              v_ptr,
                              rgb_row,
                              width);
   }
 
   _mm_empty();
 }
 
+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,
+                           int rgbstride,
+                           YUVType yuv_type) {
+  unsigned int y_shift = 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;
+    const uint8* a_ptr = aplane + y * astride;
+
+    ConvertYUVAToARGBRow_MMX(y_ptr,
+                             u_ptr,
+                             v_ptr,
+                             a_ptr,
+                             rgb_row,
+                             width);
+  }
+
+  _mm_empty();
+}
+
 void ConvertYUVToRGB32_SSE(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 = 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_SSE(y_ptr,
                              u_ptr,
                              v_ptr,
                              rgb_row,
                              width);
   }
 
   _mm_empty();
 }
 
 }  // namespace media