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+// Copyright (c) 2014-2015 The Chromium Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in
+//    the documentation and/or other materials provided with the
+//    distribution.
+//  * Neither the name of Google, Inc. nor the names of its contributors
+//    may be used to endorse or promote products derived from this
+//    software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+// SUCH DAMAGE.
+
+#ifndef SKIA_EXT_CONVOLVER_LS3_H_
+#define SKIA_EXT_CONVOLVER_LS3_H_
+
+#include "convolver.h"
+
+#include <algorithm>
+
+#include "skia/include/core/SkTypes.h"
+
+namespace skia {
+
+// Convolves horizontally along a single row. The row data is given in
+// |src_data| and continues for the [begin, end) of the filter.
+void ConvolveHorizontally_LS3(const unsigned char* src_data,
+                               const ConvolutionFilter1D& filter,
+                               unsigned char* out_row);
+
+// Convolves horizontally along a single row. The row data is given in
+// |src_data| and continues for the [begin, end) of the filter.
+// Process one pixel at a time.
+void ConvolveHorizontally1_LS3(const unsigned char* src_data,
+                               const ConvolutionFilter1D& filter,
+                               unsigned char* out_row);
+
+// Convolves horizontally along four rows. The row data is given in
+// |src_data| and continues for the [begin, end) of the filter.
+// The algorithm is almost same as |ConvolveHorizontally_LS3|. Please
+// refer to that function for detailed comments.
+void ConvolveHorizontally4_LS3(const unsigned char* src_data[4],
+                                const ConvolutionFilter1D& filter,
+                                unsigned char* out_row[4]);
+
+// Does vertical convolution to produce one output row. The filter values and
+// length are given in the first two parameters. These are applied to each
+// of the rows pointed to in the |source_data_rows| array, with each row
+// being |pixel_width| wide.
+//
+// The output must have room for |pixel_width * 4| bytes.
+void ConvolveVertically_LS3(const ConvolutionFilter1D::Fixed* filter_values,
+                             int filter_length,
+                             unsigned char* const* source_data_rows,
+                             int pixel_width,
+                             unsigned char* out_row, bool has_alpha);
+
+}  // namespace skia
+
+#endif  // SKIA_EXT_CONVOLVER_LS3_H_