COM_ConvolutionEdgeFilterOperation.cc

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/* SPDX-FileCopyrightText: 2011 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "COM_ConvolutionEdgeFilterOperation.h"
 
namespace blender::compositor {
 
void ConvolutionEdgeFilterOperation::update_memory_buffer_partial(MemoryBuffer *output,
                                                                  const rcti &area,
                                                                  Span<MemoryBuffer *> inputs)
{
  const MemoryBuffer *image = inputs[IMAGE_INPUT_INDEX];
  const int last_x = get_width() - 1;
  const int last_y = get_height() - 1;
  for (BuffersIterator<float> it = output->iterate_with(inputs, area); !it.is_end(); ++it) {
    const int left_offset = (it.x == 0) ? 0 : -image->elem_stride;
    const int right_offset = (it.x == last_x) ? 0 : image->elem_stride;
    const int down_offset = (it.y == 0) ? 0 : -image->row_stride;
    const int up_offset = (it.y == last_y) ? 0 : image->row_stride;
 
    const float *center_color = it.in(IMAGE_INPUT_INDEX);
    float res1[4] = {0};
    float res2[4] = {0};
 
    const float *color = center_color + down_offset + left_offset;
    madd_v3_v3fl(res1, color, filter_[0]);
    copy_v3_v3(res2, res1);
 
    color = center_color + down_offset;
    madd_v3_v3fl(res1, color, filter_[1]);
    madd_v3_v3fl(res2, color, filter_[3]);
 
    color = center_color + down_offset + right_offset;
    madd_v3_v3fl(res1, color, filter_[2]);
    madd_v3_v3fl(res2, color, filter_[6]);
 
    color = center_color + left_offset;
    madd_v3_v3fl(res1, color, filter_[3]);
    madd_v3_v3fl(res2, color, filter_[1]);
 
    {
      float rgb_filtered[3];
      mul_v3_v3fl(rgb_filtered, center_color, filter_[4]);
      add_v3_v3(res1, rgb_filtered);
      add_v3_v3(res2, rgb_filtered);
    }
 
    color = center_color + right_offset;
    madd_v3_v3fl(res1, color, filter_[5]);
    madd_v3_v3fl(res2, color, filter_[7]);
 
    color = center_color + up_offset + left_offset;
    madd_v3_v3fl(res1, color, filter_[6]);
    madd_v3_v3fl(res2, color, filter_[2]);
 
    color = center_color + up_offset;
    madd_v3_v3fl(res1, color, filter_[7]);
    madd_v3_v3fl(res2, color, filter_[5]);
 
    {
      color = center_color + up_offset + right_offset;
      float rgb_filtered[3];
      mul_v3_v3fl(rgb_filtered, color, filter_[8]);
      add_v3_v3(res1, rgb_filtered);
      add_v3_v3(res2, rgb_filtered);
    }
 
    it.out[0] = sqrt(res1[0] * res1[0] + res2[0] * res2[0]);
    it.out[1] = sqrt(res1[1] * res1[1] + res2[1] * res2[1]);
    it.out[2] = sqrt(res1[2] * res1[2] + res2[2] * res2[2]);
 
    const float factor = *it.in(FACTOR_INPUT_INDEX);
    const float factor_ = 1.0f - factor;
    it.out[0] = it.out[0] * factor + center_color[0] * factor_;
    it.out[1] = it.out[1] * factor + center_color[1] * factor_;
    it.out[2] = it.out[2] * factor + center_color[2] * factor_;
 
    it.out[3] = center_color[3];
 
    /* Make sure we don't return negative color. */
    CLAMP4_MIN(it.out, 0.0f);
  }
}
 
}  // namespace blender::compositor