DirectDraw的高性能表面，DDraw是面向表面的作图系统，所谓面向表面就是说所有作图不是只是针对屏幕（显存）的，而是针对一块作图区域，你可以在作图区域上面画点，线绘图片然后可以在区域与区域之间拷贝图形，这种作图区域在微软的DirectX中被叫做表面（Surface），在其他开发包中被叫做位图（Bitmap）或者图层（Layer），总之都可以称为面向表面的作图系统，这是最灵活高效的作图方式。-High-performance DirectDraw surface, DDraw surface-oriented mapping systems, the so-called mapping for all of the surface that is not just for the screen (memory), but against a plot area, you can plot area above draw points, lines, drawing pictures and then you can copy graphics from region to region, this mapping in the region called Microsoft' s DirectX surface (Surface), in other development package is called a bitmap (Bitmap) or layer ( Layer), a word can be called for surface mapping system, which is drawing the most flexible and efficient way.