// Copyright (c) 2014-2015 The Chromium Authors. All rights reserved.
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#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,
                               int begin, int end,
                               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],
                                int begin, int end,
                                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 begin, int end,
                             unsigned char* out_row, bool has_alpha);

}  // namespace skia

#endif  // SKIA_EXT_CONVOLVER_LS3_H_