帧的局部经过位块传输后保存在缓冲区，最终在屏幕显示。 这种预转换通过帧间转换，对保持色彩状态十分重要。
This pre-conversion is critical for maintaining color state through transitions of different frames as their portions are blitted to the buffer and, eventually, the screen.
为了提高效率，一些应用程序可以将原始数据(而不是经过格式化的数据)保存到该缓冲区。
To improve efficiency, some applications keep raw data instead of putting the formatted data in the buffer.
如果链接名太长，不能保存到缓冲区中，就应该被截断。
If the linkname is too long to fit in the buffer, it should be truncated.
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