Method NewFastGeomQuad

Filters/Geometry/vtkDataSetSurfaceFilter.cxx:2616–2667

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
vtkFastGeomQuad* vtkDataSetSurfaceFilter::NewFastGeomQuad(int numPts)
{
  if (this->FastGeomQuadArrayLength == 0)
  {
    vtkErrorMacro("Face hash allocation has not been initialized.");
    return nullptr;
  }

  // see if there's room for this one
  int polySize = sizeofFastQuad(numPts);
  if (this->NextQuadIndex + polySize > this->FastGeomQuadArrayLength)
  {
    ++(this->NextArrayIndex);
    this->NextQuadIndex = 0;
  }

  // Although this should not happen often, check first.
  if (this->NextArrayIndex >= this->NumberOfFastGeomQuadArrays)
  {
    int idx, num;
    unsigned char** newArrays;
    num = this->NumberOfFastGeomQuadArrays * 2;
    newArrays = new unsigned char*[num];
    for (idx = 0; idx < num; ++idx)
    {
      newArrays[idx] = nullptr;
      if (idx < this->NumberOfFastGeomQuadArrays)
      {
        newArrays[idx] = this->FastGeomQuadArrays[idx];
      }
    }
    delete[] this->FastGeomQuadArrays;
    this->FastGeomQuadArrays = newArrays;
    this->NumberOfFastGeomQuadArrays = num;
  }

  // Next: allocate a new array if necessary.
  if (this->FastGeomQuadArrays[this->NextArrayIndex] == nullptr)
  {
    this->FastGeomQuadArrays[this->NextArrayIndex] =
      new unsigned char[this->FastGeomQuadArrayLength];
  }

  vtkFastGeomQuad* q = reinterpret_cast<vtkFastGeomQuad*>(
    this->FastGeomQuadArrays[this->NextArrayIndex] + this->NextQuadIndex);
  q->numPts = numPts;
  q->ptArray = (vtkIdType*)q + FSizeDivSizeId;

  this->NextQuadIndex += polySize;

  return q;
}

//------------------------------------------------------------------------------
void vtkDataSetSurfaceFilter::InitQuadHashTraversal()