SIMD implementation of Convolver for Lanczos filter etc.

skia/ext/convolver.h

 // 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.
 
 #ifndef SKIA_EXT_CONVOLVER_H_
 #define SKIA_EXT_CONVOLVER_H_
 #pragma once
 
 #include <cmath>
 #include <vector>
@@ skipping 80 matching lines @@
                                      int* filter_length) const {
     const FilterInstance& filter = filters_[value_offset];
     *filter_offset = filter.offset;
     *filter_length = filter.length;
     if (filter.length == 0) {
       return NULL;
     }
     return &filter_values_[filter.data_location];
   }
 
+  inline void PaddingForSIMD(int align) {
+    // Padding more coefficients to allow SIMD to load after the last one.
+    // This has to be done after all |AddFilter| calls.
+    for (int i = 0; i < align; ++i)
+      filter_values_.push_back(static_cast<Fixed>(0));
+  }
+
  private:
   struct FilterInstance {
     // Offset within filter_values for this instance of the filter.
     int data_location;
 
     // Distance from the left of the filter to the center. IN PIXELS
     int offset;
 
     // Number of values in this filter instance.
     int length;
@@ skipping 28 matching lines @@
 // percent faster if you know the image is opaque.
 //
 // The layout in memory is assumed to be 4-bytes per pixel in B-G-R-A order
 // (this is ARGB when loaded into 32-bit words on a little-endian machine).
 void BGRAConvolve2D(const unsigned char* source_data,
                     int source_byte_row_stride,
                     bool source_has_alpha,
                     const ConvolutionFilter1D& xfilter,
                     const ConvolutionFilter1D& yfilter,
                     int output_byte_row_stride,
-                    unsigned char* output);
+                    unsigned char* output,
+                    bool use_sse2 = false);
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_CONVOLVER_H_