Resubmit - Rewrite color space conversions suite using YASM"

media/base/simd/filter_yuv_c.cc

Index: media/base/simd/filter_yuv_c.cc
diff --git a/media/base/simd/filter_yuv_c.cc b/media/base/simd/filter_yuv_c.cc
new file mode 100644
index 0000000000000000000000000000000000000000..95ae01a245676b03fddeb79c777e14c2ca0c6659
--- /dev/null
+++ b/media/base/simd/filter_yuv_c.cc
@@ -0,0 +1,29 @@
+// 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.
+
+#include "media/base/simd/filter_yuv.h"
+
+namespace media {
+
+void FilterYUVRows_C(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
+                     int source_width, int source_y_fraction) {
+  int y1_fraction = source_y_fraction;
+  int y0_fraction = 256 - y1_fraction;
+  uint8* end = ybuf + source_width;
+  do {
+    ybuf[0] = (y0_ptr[0] * y0_fraction + y1_ptr[0] * y1_fraction) >> 8;
+    ybuf[1] = (y0_ptr[1] * y0_fraction + y1_ptr[1] * y1_fraction) >> 8;
+    ybuf[2] = (y0_ptr[2] * y0_fraction + y1_ptr[2] * y1_fraction) >> 8;
+    ybuf[3] = (y0_ptr[3] * y0_fraction + y1_ptr[3] * y1_fraction) >> 8;
+    ybuf[4] = (y0_ptr[4] * y0_fraction + y1_ptr[4] * y1_fraction) >> 8;
+    ybuf[5] = (y0_ptr[5] * y0_fraction + y1_ptr[5] * y1_fraction) >> 8;
+    ybuf[6] = (y0_ptr[6] * y0_fraction + y1_ptr[6] * y1_fraction) >> 8;
+    ybuf[7] = (y0_ptr[7] * y0_fraction + y1_ptr[7] * y1_fraction) >> 8;
+    y0_ptr += 8;
+    y1_ptr += 8;
+    ybuf += 8;
+  } while (ybuf < end);
+}
+
+}  // namespace media