extract_indices.hpp

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#ifndef PCL_FILTERS_IMPL_EXTRACT_INDICES_HPP_
#define PCL_FILTERS_IMPL_EXTRACT_INDICES_HPP_

#include <pcl/filters/extract_indices.h>
#include <pcl/common/io.h>

template <typename PointT> void
pcl::ExtractIndices<PointT>::filterDirectly (PointCloudPtr &cloud)
{
  std::vector<int> indices;
  bool temp = extract_removed_indices_;
  extract_removed_indices_ = true;
  this->setInputCloud (cloud);
  applyFilterIndices (indices);
  extract_removed_indices_ = temp;

  std::vector<pcl::PCLPointField> fields;
  pcl::for_each_type<FieldList> (pcl::detail::FieldAdder<PointT> (fields));
  for (int rii = 0; rii < static_cast<int> (removed_indices_->size ()); ++rii)  // rii = removed indices iterator
  {
    uint8_t* pt_data = reinterpret_cast<uint8_t*> (&cloud->points[(*removed_indices_)[rii]]);
    for (int fi = 0; fi < static_cast<int> (fields.size ()); ++fi)  // fi = field iterator
      memcpy (pt_data + fields[fi].offset, &user_filter_value_, sizeof (float));
  }
  if (!pcl_isfinite (user_filter_value_))
    cloud->is_dense = false;
}

template <typename PointT> void
pcl::ExtractIndices<PointT>::applyFilter (PointCloud &output)
{
  std::vector<int> indices;
  if (keep_organized_)
  {
    bool temp = extract_removed_indices_;
    extract_removed_indices_ = true;
    applyFilterIndices (indices);
    extract_removed_indices_ = temp;

    output = *input_;
    std::vector<pcl::PCLPointField> fields;
    pcl::for_each_type<FieldList> (pcl::detail::FieldAdder<PointT> (fields));
    for (int rii = 0; rii < static_cast<int> (removed_indices_->size ()); ++rii)  // rii = removed indices iterator
    {
      uint8_t* pt_data = reinterpret_cast<uint8_t*> (&output.points[(*removed_indices_)[rii]]);
      for (int fi = 0; fi < static_cast<int> (fields.size ()); ++fi)  // fi = field iterator
        memcpy (pt_data + fields[fi].offset, &user_filter_value_, sizeof (float));
    }
    if (!pcl_isfinite (user_filter_value_))
      output.is_dense = false;
  }
  else
  {
    applyFilterIndices (indices);
    copyPointCloud (*input_, indices, output);
  }
}

template <typename PointT> void
pcl::ExtractIndices<PointT>::applyFilterIndices (std::vector<int> &indices)
{
  if (indices_->size () > input_->points.size ())
  {
    PCL_ERROR ("[pcl::%s::applyFilter] The indices size exceeds the size of the input.\n", getClassName ().c_str ());
    indices.clear ();
    removed_indices_->clear ();
    return;
  }

  if (!negative_)  // Normal functionality
  {
    indices = *indices_;

    if (extract_removed_indices_)
    {
      // Set up the full indices set
      std::vector<int> full_indices (input_->points.size ());
      for (int fii = 0; fii < static_cast<int> (full_indices.size ()); ++fii)  // fii = full indices iterator
        full_indices[fii] = fii;

      // Set up the sorted input indices
      std::vector<int> sorted_input_indices = *indices_;
      std::sort (sorted_input_indices.begin (), sorted_input_indices.end ());

      // Store the difference in removed_indices
      removed_indices_->clear ();
      set_difference (full_indices.begin (), full_indices.end (), sorted_input_indices.begin (), sorted_input_indices.end (), inserter (*removed_indices_, removed_indices_->begin ()));
    }
  }
  else  // Inverted functionality
  {
    // Set up the full indices set
    std::vector<int> full_indices (input_->points.size ());
    for (int fii = 0; fii < static_cast<int> (full_indices.size ()); ++fii)  // fii = full indices iterator
      full_indices[fii] = fii;

    // Set up the sorted input indices
    std::vector<int> sorted_input_indices = *indices_;
    std::sort (sorted_input_indices.begin (), sorted_input_indices.end ());

    // Store the difference in indices
    indices.clear ();
    set_difference (full_indices.begin (), full_indices.end (), sorted_input_indices.begin (), sorted_input_indices.end (), inserter (indices, indices.begin ()));

    if (extract_removed_indices_)
      removed_indices_ = indices_;
  }
}

#define PCL_INSTANTIATE_ExtractIndices(T) template class PCL_EXPORTS pcl::ExtractIndices<T>;

#endif  // PCL_FILTERS_IMPL_EXTRACT_INDICES_HPP_