We don't use boxBlurY.

src/opts/opts_check_x86.cpp

 /*
  * Copyright 2009 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 "SkBitmapFilter_opts_SSE2.h"
 #include "SkBitmapProcState_opts_SSE2.h"
 #include "SkBitmapProcState_opts_SSSE3.h"
@@ skipping 332 matching lines @@
         case kErodeY_SkMorphologyProcType:
             return SkErodeY_SSE2;
         default:
             return NULL;
     }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 bool SkBoxBlurGetPlatformProcs(SkBoxBlurProc* boxBlurX,
-                               SkBoxBlurProc* boxBlurY,
                                SkBoxBlurProc* boxBlurXY,
                                SkBoxBlurProc* boxBlurYX) {
-#ifdef SK_DISABLE_BLUR_DIVISION_OPTIMIZATION
-    return false;
-#else
     if (supports_simd(SK_CPU_SSE_LEVEL_SSE41)) {
-        return SkBoxBlurGetPlatformProcs_SSE4(boxBlurX, boxBlurY, boxBlurXY, boxBlurYX);
+        return SkBoxBlurGetPlatformProcs_SSE4(boxBlurX, boxBlurXY, boxBlurYX);
     }
     else if (supports_simd(SK_CPU_SSE_LEVEL_SSE2)) {
-        return SkBoxBlurGetPlatformProcs_SSE2(boxBlurX, boxBlurY, boxBlurXY, boxBlurYX);
+        return SkBoxBlurGetPlatformProcs_SSE2(boxBlurX, boxBlurXY, boxBlurYX);
     }
     return false;
-#endif
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 extern SkProcCoeffXfermode* SkPlatformXfermodeFactory_impl_SSE2(const ProcCoeff& rec,
                                                                 SkXfermode::Mode mode);
 
 SkProcCoeffXfermode* SkPlatformXfermodeFactory_impl(const ProcCoeff& rec,
                                                     SkXfermode::Mode mode);
 
@@ skipping 12 matching lines @@
     } else {
         return SkPlatformXfermodeFactory_impl(rec, mode);
     }
 }
 
 SkXfermodeProc SkPlatformXfermodeProcFactory(SkXfermode::Mode mode);
 
 SkXfermodeProc SkPlatformXfermodeProcFactory(SkXfermode::Mode mode) {
     return NULL;
 }