Add SSE4 version of BlurImage optimizations.

src/opts/SkBlurImage_opts_SSE2.cpp

 /*
  * Copyright 2013 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <emmintrin.h>
 #include "SkBitmap.h"
 #include "SkBlurImage_opts_SSE2.h"
@@ skipping 37 matching lines @@
         __m128i sum = zero;
         const SkPMColor* p = src;
         for (int i = 0; i < rightBorder; ++i) {
             sum = _mm_add_epi32(sum, expand(*p));
             p += srcStrideX;
         }
 
         const SkPMColor* sptr = src;
         SkColor* dptr = dst;
         for (int x = 0; x < width; ++x) {
-#if 0
-            // In SSE4.1, this would be
-            __m128i result = _mm_mullo_epi32(sum, scale);
-#else
-            // But SSE2 has no PMULLUD, so we must do AG and RB separately.
+            // SSE2 has no PMULLUD, so we must do AG and RB separately.
             __m128i tmp1 = _mm_mul_epu32(sum, scale);
             __m128i tmp2 = _mm_mul_epu32(_mm_srli_si128(sum, 4),
                                          _mm_srli_si128(scale, 4));
             __m128i result = _mm_unpacklo_epi32(_mm_shuffle_epi32(tmp1, _MM_SHUFFLE(0,0,2,0)),
                                                 _mm_shuffle_epi32(tmp2, _MM_SHUFFLE(0,0,2,0)));
-#endif
+
             // sumA*scale+.5 sumB*scale+.5 sumG*scale+.5 sumB*scale+.5
             result = _mm_add_epi32(result, half);
 
             // 0 0 0 A   0 0 0 R   0 0 0 G   0 0 0 B
             result = _mm_srli_epi32(result, 24);
 
             // 0 0 0 0   0 0 0 0   0 A 0 R   0 G 0 B
             result = _mm_packs_epi32(result, zero);
 
             // 0 0 0 0   0 0 0 0   0 0 0 0   A R G B
@@ skipping 24 matching lines @@
 bool SkBoxBlurGetPlatformProcs_SSE2(SkBoxBlurProc* boxBlurX,
                                     SkBoxBlurProc* boxBlurY,
                                     SkBoxBlurProc* boxBlurXY,
                                     SkBoxBlurProc* boxBlurYX) {
     *boxBlurX = SkBoxBlur_SSE2<kX, kX>;
     *boxBlurY = SkBoxBlur_SSE2<kY, kY>;
     *boxBlurXY = SkBoxBlur_SSE2<kX, kY>;
     *boxBlurYX = SkBoxBlur_SSE2<kY, kX>;
     return true;
 }