按照官方的说法：Cairo is a vector graphics library with cross-device output support.

翻译过来，就是cairo是一个支持多种输出的向量图形库。

具体解释一下，也就是说，cairo是种画图的工具库，他可以向多种设备上画图，比如：

cairo可以输出到png,可以输出到pdf，可以输出到ps，可以输出到xlib，可以输出到XCB，可以输出到win32，以后还要输出到svg



我们可以展望一下，如果cairo能够统一linux下所有的画图接口，那么，所见所得可能就会成为显示。-according to the official statement : Cairo is a vector graphics library with cross-d evice output support. translated, cairo is the support of a variety of output vector graphics library. Explain, in other words, cairo drawing is a kind of tool library, he can draw on a variety of equipment, such as : cairo can export to png, pdf can output to be exported to ps, xlib can output to be exported to XCB, can output to win32. we still svg output to look ahead to what we can, cairo reunification can be achieved if all the linux interface drawing, then they may see will be shown.