Shawn Weisfeld [MVP]

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marker = 100;
for (int row = 0; row < iright->GetBitmapHeight(); row++)
{
  for (int column = 0; column < iright->GetBitmapWidth(); column++)
  {
    if (iright->GetGreyPixel(column, row) == 255)
    {
      System::Collections::Generic::Queue<System::Drawing::Point> q = gcnew System::Collections::Generic::Queue<System::Drawing::Point>();
      q.Enqueue(System::Drawing::Point(column, row));
      iright->SetPixel(column, row, marker);
      while (q.Count > 0)
      {
        Point p = q.Dequeue();
        if (iright->AddToStack(p.X+1, p.Y, marker))
        {
          q.Enqueue(System::Drawing::Point(p.X+1, p.Y));
          iright->SetPixel(p.X+1, p.Y, marker);
        }
        if (iright->AddToStack(p.X, p.Y+1, marker))
        {
          q.Enqueue(System::Drawing::Point(p.X, p.Y+1));
          iright->SetPixel(p.X, p.Y+1, marker);
        }
        if (iright->AddToStack(p.X-1, p.Y, marker))
        {
          q.Enqueue(System::Drawing::Point(p.X-1, p.Y));
          iright->SetPixel(p.X-1, p.Y, marker);
        }
        if (iright->AddToStack(p.X, p.Y-1, marker))
        {
          q.Enqueue(System::Drawing::Point(p.X, p.Y-1));
          iright->SetPixel(p.X, p.Y-1, marker);
        }
      }
      marker += 20;
    }
  }
}
inline bool AddToStack(int x, int y, int marker)
{
  if ((x < 0) || (x >= this->GetBitmapWidth()))
  {
    return false;
  }
  if ((y < 0) || (y >= this->GetBitmapHeight()))
  {
    return false;
  }
  int px = this->GetGreyPixel(x, y);
  if (px == 255 && px != marker)
  {
    return true;
  }
  return false;
}