利用DirectDraw创建双表面。DirectDraw允许用户直接对显示内存操作，支持硬件位块传输、硬件覆盖、表面翻转、纹理映射和镜像。
using DirectDraw create dual surface. DirectDraw allows users to direct memory operation, support hardware bit block transfers, hardware coverage, reversed the surface, texture mapping and image. (2005-04-05, C++ Builder, 453KB, 下载137次)