change scale down by 4 to use rounding.

include/libyuv/scale_row.h

 /*
  *  Copyright 2013 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 41 matching lines @@
 #define HAS_SCALEARGBCOLS_SSE2
 #define HAS_SCALEARGBCOLSUP2_SSE2
 #define HAS_SCALEARGBFILTERCOLS_SSSE3
 #define HAS_SCALEARGBROWDOWN2_SSE2
 #define HAS_SCALEARGBROWDOWNEVEN_SSE2
 #define HAS_SCALECOLSUP2_SSE2
 #define HAS_SCALEFILTERCOLS_SSSE3
 #define HAS_SCALEROWDOWN2_SSSE3
 #define HAS_SCALEROWDOWN34_SSSE3
 #define HAS_SCALEROWDOWN38_SSSE3
-#define HAS_SCALEROWDOWN4_SSE2
+#define HAS_SCALEROWDOWN4_SSSE3
 #define HAS_SCALEADDROW_SSE2
 #endif
 
 // The following are available on all x86 platforms, but
 // require VS2012, clang 3.4 or gcc 4.7.
 // The code supports NaCL but requires a new compiler and validator.
 #if !defined(LIBYUV_DISABLE_X86) && (defined(VISUALC_HAS_AVX2) || \
     defined(CLANG_HAS_AVX2) || defined(GCC_HAS_AVX2))
 #define HAS_SCALEADDROW_AVX2
 #define HAS_SCALEROWDOWN2_AVX2
@@ skipping 164 matching lines @@
 void ScaleRowDown2Linear_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
                                uint8* dst_ptr, int dst_width);
 void ScaleRowDown2Box_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
                             uint8* dst_ptr, int dst_width);
 void ScaleRowDown2_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                         uint8* dst_ptr, int dst_width);
 void ScaleRowDown2Linear_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                               uint8* dst_ptr, int dst_width);
 void ScaleRowDown2Box_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                            uint8* dst_ptr, int dst_width);
-void ScaleRowDown4_SSE2(const uint8* src_ptr, ptrdiff_t src_stride,
-                        uint8* dst_ptr, int dst_width);
-void ScaleRowDown4Box_SSE2(const uint8* src_ptr, ptrdiff_t src_stride,
-                           uint8* dst_ptr, int dst_width);
+void ScaleRowDown4_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
+                         uint8* dst_ptr, int dst_width);
+void ScaleRowDown4Box_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
+                            uint8* dst_ptr, int dst_width);
 void ScaleRowDown4_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                         uint8* dst_ptr, int dst_width);
 void ScaleRowDown4Box_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                            uint8* dst_ptr, int dst_width);
 
 void ScaleRowDown34_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
                           uint8* dst_ptr, int dst_width);
 void ScaleRowDown34_1_Box_SSSE3(const uint8* src_ptr,
                                 ptrdiff_t src_stride,
                                 uint8* dst_ptr, int dst_width);
@@ skipping 13 matching lines @@
 void ScaleRowDown2Linear_Any_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
                                    uint8* dst_ptr, int dst_width);
 void ScaleRowDown2Box_Any_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
                                uint8* dst_ptr, int dst_width);
 void ScaleRowDown2_Any_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                             uint8* dst_ptr, int dst_width);
 void ScaleRowDown2Linear_Any_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                                   uint8* dst_ptr, int dst_width);
 void ScaleRowDown2Box_Any_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                            uint8* dst_ptr, int dst_width);
-void ScaleRowDown4_Any_SSE2(const uint8* src_ptr, ptrdiff_t src_stride,
-                            uint8* dst_ptr, int dst_width);
-void ScaleRowDown4Box_Any_SSE2(const uint8* src_ptr, ptrdiff_t src_stride,
-                               uint8* dst_ptr, int dst_width);
+void ScaleRowDown4_Any_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
+                             uint8* dst_ptr, int dst_width);
+void ScaleRowDown4Box_Any_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
+                                uint8* dst_ptr, int dst_width);
 void ScaleRowDown4_Any_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                             uint8* dst_ptr, int dst_width);
 void ScaleRowDown4Box_Any_AVX2(const uint8* src_ptr, ptrdiff_t src_stride,
                                uint8* dst_ptr, int dst_width);
 
 void ScaleRowDown34_Any_SSSE3(const uint8* src_ptr, ptrdiff_t src_stride,
                               uint8* dst_ptr, int dst_width);
 void ScaleRowDown34_1_Box_Any_SSSE3(const uint8* src_ptr,
                                     ptrdiff_t src_stride,
                                     uint8* dst_ptr, int dst_width);
@@ skipping 189 matching lines @@
 void ScaleRowDown38_3_Box_MIPS_DSPR2(const uint8* src_ptr,
                                      ptrdiff_t src_stride,
                                      uint8* dst_ptr, int dst_width);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_SCALE_ROW_H_  NOLINT