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http://www.360doc.com/content/11/1015/09/992979_156314240.shtml
http://www.cppblog.com/Shihira/archive/2012/07/24/183204.html http://www.cnblogs.com/liyiwen/archive/2010/06/03/1751094.html
AGGAGGAPIwindowsLinuxAPIRendering缓冲区
1.1 PPM PPMPortable像素地图Windows IrfanViewwww.irfanview.com gg P6 256 RGB RGB-buffer
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unsigned char * p=rbuf.row (i);
unsigned char * p=rbuf.row_ptr (i);