Make SSE2/Neon convolution functions not to read extra bytes

src/core/SkConvolver.h

 // 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.
 
 #ifndef SK_CONVOLVER_H
 #define SK_CONVOLVER_H
 
 #include "SkSize.h"
 #include "SkTDArray.h"
 
@@ skipping 139 matching lines @@
 typedef void (*SkConvolve4RowsHorizontally_pointer)(
     const unsigned char* srcData[4],
     const SkConvolutionFilter1D& filter,
     unsigned char* outRow[4],
     size_t outRowBytes);
 typedef void (*SkConvolveHorizontally_pointer)(
     const unsigned char* srcData,
     const SkConvolutionFilter1D& filter,
     unsigned char* outRow,
     bool hasAlpha);
-typedef void (*SkConvolveFilterPadding_pointer)(
-    SkConvolutionFilter1D* filter);
 
 struct SkConvolutionProcs {
-  // This is how many extra pixels may be read by the
-  // conolve*horizontally functions.
-    int fExtraHorizontalReads;
     SkConvolveVertically_pointer fConvolveVertically;
     SkConvolve4RowsHorizontally_pointer fConvolve4RowsHorizontally;
     SkConvolveHorizontally_pointer fConvolveHorizontally;
-    SkConvolveFilterPadding_pointer fApplySIMDPadding;
 };
 
 
 
 // Does a two-dimensional convolution on the given source image.
 //
 // It is assumed the source pixel offsets referenced in the input filters
 // reference only valid pixels, so the source image size is not required. Each
 // row of the source image starts |sourceByteRowStride| after the previous
 // one (this allows you to have rows with some padding at the end).
@@ skipping 17 matching lines @@
     int sourceByteRowStride,
     bool sourceHasAlpha,
     const SkConvolutionFilter1D& xfilter,
     const SkConvolutionFilter1D& yfilter,
     int outputByteRowStride,
     unsigned char* output,
     const SkConvolutionProcs&,
     bool useSimdIfPossible);
 
 #endif  // SK_CONVOLVER_H