Function FindPointsToSend

Filters/ParallelDIY2/vtkPResampleWithDataSet.cxx:700–753

Send input points that overlap remote's source bounds

// Send input points that overlap remote's source bounds
void FindPointsToSend(DiyBlock* block, const diy::Master::ProxyWithLink& cp)
{
  diy::Link* link = cp.link();
  for (int l = 0; l < link->size(); ++l)
  {
    diy::BlockID neighbor = link->target(l);
    PointsList points;

    vtkBoundingBox fullBounds;
    std::vector<double>& boundsArray = block->SourceBlocksBounds[neighbor.proc];
    for (size_t next = 0; next < boundsArray.size(); next += 6)
    {
      double* sbounds = &boundsArray[next];
      block->PointsLookup->FindPointsInBounds(sbounds, points.Explicit);
      fullBounds.AddBounds(sbounds);
    }
    // group the points by BlockId
    std::sort(points.Explicit.begin(), points.Explicit.end(), ComparePointsByBlockId);

    for (size_t i = 0; i < block->InputBlocks.size(); ++i)
    {
      vtkImageData* img = vtkImageData::SafeDownCast(block->InputBlocks[i]);
      if (img)
      {
        vtkBoundingBox imgBounds(img->GetBounds());
        if (imgBounds.IntersectBox(fullBounds))
        {
          int* inExtents = img->GetExtent();
          double* inOrigin = img->GetOrigin();
          double* inSpacing = img->GetSpacing();

          double sendBounds[6];
          imgBounds.GetBounds(sendBounds);
          int sendExtents[6];
          ComputeExtentsForBounds(inOrigin, inSpacing, inExtents, sendBounds, sendExtents);

          ImplicitPoints pts;
          std::copy(sendExtents, sendExtents + 6, pts.Extents);
          std::copy(inOrigin, inOrigin + 3, pts.Origin);
          std::copy(inSpacing, inSpacing + 3, pts.Spacing);
          for (int j = 0; j < 3; ++j)
          {
            pts.BlockStart[j] = inExtents[2 * j];
            pts.BlockDim[j] = inExtents[2 * j + 1] - inExtents[2 * j] + 1;
          }
          pts.BlockId = static_cast<int>(i);
          points.Implicit.push_back(pts);
        }
      }
    }

    cp.enqueue(neighbor, points);
  }
}

class EnqueueDataArray
{