FairyGUI.Container.DoFairyBatching C# (CSharp) Method

        private void DoFairyBatching()
        {
            _fBatchingRequested = false;

            if (_descendants == null)
                _descendants = new List<DisplayObject>();
            else
                _descendants.Clear();
            CollectChildren(this);

            int cnt = _descendants.Count;
            //Debug.Log("DoFairyBatching " + cnt + "," + this.cachedTransform.GetInstanceID());

            int i, j, k, m;
            object curMat, testMat, lastMat;
            DisplayObject current, test;
            Rect bound;
            for (i = 0; i < cnt; i++)
            {
                current = _descendants[i];
                bound = current._internal_bounds;
                curMat = current.material;
                if (curMat == null || current._skipInFairyBatching)
                    continue;

                k = -1;
                lastMat = null;
                m = i;
                for (j = i - 1; j >= 0; j--)
                {
                    test = _descendants[j];
                    if (test._skipInFairyBatching)
                        break;

                    testMat = test.material;
                    if (testMat != null)
                    {
                        if (lastMat != testMat)
                        {
                            lastMat = testMat;
                            m = j + 1;
                        }

                        if (curMat == testMat)
                            k = m;
                    }

                    if (bound.Overlaps(test._internal_bounds))
                    {
                        if (k == -1)
                            k = m;
                        break;
                    }
                }
                if (k != -1 && i != k)
                {
                    _descendants.RemoveAt(i);
                    _descendants.Insert(k, current);
                }
            }
        }

        private void CollectChildren(Container initiator)
        {
            int count = _children.Count;

            for (int i = 0; i < count; i++)
            {
                DisplayObject child = _children[i];
                if (child is Container)
                {
                    Container container = (Container)child;
                    if (container._fBatchingRoot)
                    {
                        initiator._descendants.Add(container);
                        container._internal_bounds = container.GetBounds(initiator);
                        if (container._fBatchingRequested)
                        {
                            container.DoFairyBatching();
                        }
                    }
                    else
                    {
                        container.CollectChildren(initiator);
                    }
                }
                else if (child != initiator._mask)
                {
                    child._internal_bounds = child.GetBounds(initiator);
                    initiator._descendants.Add(child);
                }
            }
        }