/// <summary>Removes and returns the <see cref="FloodFillRange"/> at the beginning of the queue.</summary>
public FloodFillRange Dequeue()
{
FloodFillRange range = new FloodFillRange();
if (size > 0)
{
range = array[head];
array[head] = new FloodFillRange();
head++; //advance head position
size--; //update size to exclude dequeued item
}
return(range);
}
