Method updateCompression

MyGUIEngine/src/MyGUI_LayerNode.cpp:267–305

	}

	void LayerNode::updateCompression()
	{
		if (mFirstRenderItems.size() <= 1)
			return;

		bool need_compression = false;
		for (const auto& firstRenderItem : mFirstRenderItems)
		{
			if (firstRenderItem->getNeedCompression())
			{
				firstRenderItem->setNeedCompression(false);
				need_compression = true;
				break;
			}
		}

		if (!need_compression)
		{
			mLastNotEmptyItem = mFirstRenderItems.size() - 1;
		}
		else
		{
			// pushing all empty buffers to the end of buffers list
			VectorRenderItem nonEmptyItems;
			nonEmptyItems.reserve(mFirstRenderItems.size());
			VectorRenderItem emptyItems;

			for (const auto& item : mFirstRenderItems)
			{
				if (item->getNeedVertexCount() == 0 && !item->getManualRender())
					emptyItems.push_back(item);
				else
					nonEmptyItems.push_back(item);
			}
			mLastNotEmptyItem = nonEmptyItems.size() - 1;
			nonEmptyItems.insert(nonEmptyItems.end(), emptyItems.begin(), emptyItems.end());
			std::swap(mFirstRenderItems, nonEmptyItems);
		}
	}

	ILayer* LayerNode::getLayer() const
	{