Function vtkImageCanvasSource2DFill

Imaging/Sources/vtkImageCanvasSource2D.cxx:1112–1363

//------------------------------------------------------------------------------
template <class T>
void vtkImageCanvasSource2DFill(vtkImageData* image, double* color, T* ptr, int x, int y)
{
  vtkImageCanvasSource2DPixel* pixel;
  vtkImageCanvasSource2DPixel *first, *last;
  vtkImageCanvasSource2DPixel* heap = nullptr;
  int min0, max0, min1, max1, min2, max2, maxV;
  int idxV;
  vtkIdType inc0, inc1, inc2;
  T fillColor[10];
  T drawColor[10];
  T *ptrV, *ptrC;
  int temp;

  image->GetExtent(min0, max0, min1, max1, min2, max2);
  maxV = image->GetNumberOfScalarComponents() - 1;
  image->GetIncrements(inc0, inc1, inc2);

  // Copy the fill color and make sure it differs from drawColor.
  ptrV = ptr;
  temp = 1;
  for (idxV = 0; idxV <= maxV; ++idxV)
  {
    // Save the fill color
    fillColor[idxV] = *ptrV;
    drawColor[idxV] = static_cast<T>(color[idxV]);
    if (*ptrV != drawColor[idxV])
    {
      temp = 0;
    }
    ptrV++;
  }
  if (temp)
  { // fill the same as draw
    vtkGenericWarningMacro("Fill: Cannot handle draw color same as fill color");
    return;
  }

  // Create the seed
  pixel = vtkImageCanvasSource2DPixel::New();
  pixel->X = x;
  pixel->Y = y;
  pixel->Pointer = static_cast<void*>(ptr);
  pixel->Next = nullptr;
  first = last = pixel;
  // change the seeds color
  ptrV = static_cast<T*>(last->Pointer);
  ptrC = drawColor;
  for (idxV = 0; idxV <= maxV; ++idxV)
  {
    *ptrV = *ptrC++;
    ptrV++;
  }

  while (first)
  {
    ptr = static_cast<T*>(first->Pointer);

    // check bounds for -x neighbor