DDA画线算法, 此处加上了延时，更便于观察画线过程，演示效果好。-DDA line drawing algorithm, here coupled with the delay, but also easy to observe the process of drawing lines to demonstrate good results.

x264-vc6.0编译通过的加上详细的代码注释,可以深入的了解x264编码解码过程-coupled with detailed code comments x264-vc6.0 compiled by the x264 encoder, in-depth understanding of the decoding process