convolver.cc | Explore in Territory

// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include <algorithm>

#include "base/check_op.h"
#include "base/notreached.h"
#include "skia/ext/convolver.h"
#include "skia/ext/convolver_SSE2.h"
#include "skia/ext/convolver_mips_dspr2.h"
#include "skia/ext/convolver_neon.h"
#include "skia/ext/convolver_LSX.h"
#include "third_party/skia/include/core/SkSize.h"
#include "third_party/skia/include/core/SkTypes.h"

namespace skia {

namespace {

// Converts the argument to an 8-bit unsigned value by clamping to the range
// 0-255.
inline unsigned char ClampTo8(int a) { … }

// Takes the value produced by accumulating element-wise product of image with
// a kernel and brings it back into range.
// All of the filter scaling factors are in fixed point with kShiftBits bits of
// fractional part.
inline unsigned char BringBackTo8(int a, bool take_absolute) { … }

// Stores a list of rows in a circular buffer. The usage is you write into it
// by calling AdvanceRow. It will keep track of which row in the buffer it
// should use next, and the total number of rows added.
class CircularRowBuffer { … };

// Convolves horizontally along a single row. The row data is given in
// |src_data| and continues for the num_values() of the filter.
template<bool has_alpha>
void ConvolveHorizontally(const unsigned char* src_data,
                          const ConvolutionFilter1D& filter,
                          unsigned char* out_row) { … }

// 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.
template<bool has_alpha>
void ConvolveVertically(const ConvolutionFilter1D::Fixed* filter_values,
                        int filter_length,
                        unsigned char* const* source_data_rows,
                        int pixel_width,
                        unsigned char* out_row) { … }

void ConvolveVertically(const ConvolutionFilter1D::Fixed* filter_values,
                        int filter_length,
                        unsigned char* const* source_data_rows,
                        int pixel_width,
                        unsigned char* out_row,
                        bool source_has_alpha) { … }

}  // namespace

// ConvolutionFilter1D ---------------------------------------------------------

ConvolutionFilter1D::ConvolutionFilter1D()
    : … { … }

ConvolutionFilter1D::~ConvolutionFilter1D() = default;

void ConvolutionFilter1D::AddFilter(int filter_offset,
                                    const float* filter_values,
                                    int filter_length) { … }

void ConvolutionFilter1D::AddFilter(int filter_offset,
                                    const Fixed* filter_values,
                                    int filter_length) { … }

const ConvolutionFilter1D::Fixed* ConvolutionFilter1D::GetSingleFilter(
    int* specified_filter_length,
    int* filter_offset,
    int* filter_length) const { … }

ConvolveVertically_pointer;
Convolve4RowsHorizontally_pointer;
ConvolveHorizontally_pointer;

struct ConvolveProcs { … };

void SetupSIMD(ConvolveProcs *procs) { … }

void BGRAConvolve2D(const unsigned char* source_data,
                    int source_byte_row_stride,
                    bool source_has_alpha,
                    const ConvolutionFilter1D& filter_x,
                    const ConvolutionFilter1D& filter_y,
                    int output_byte_row_stride,
                    unsigned char* output,
                    bool use_simd_if_possible) { … }

void SingleChannelConvolveX1D(const unsigned char* source_data,
                              int source_byte_row_stride,
                              int input_channel_index,
                              int input_channel_count,
                              const ConvolutionFilter1D& filter,
                              const SkISize& image_size,
                              unsigned char* output,
                              int output_byte_row_stride,
                              int output_channel_index,
                              int output_channel_count,
                              bool absolute_values) { … }

void SingleChannelConvolveY1D(const unsigned char* source_data,
                              int source_byte_row_stride,
                              int input_channel_index,
                              int input_channel_count,
                              const ConvolutionFilter1D& filter,
                              const SkISize& image_size,
                              unsigned char* output,
                              int output_byte_row_stride,
                              int output_channel_index,
                              int output_channel_count,
                              bool absolute_values) { … }

void SetUpGaussianConvolutionKernel(ConvolutionFilter1D* filter,
                                    float kernel_sigma,
                                    bool derivative) { … }

}  // namespace skia
chromium/skia/ext/convolver.cc
