[cairo] How to texturing a self-defined pattern(or image) along line and fill a polygon?

[quanzhao198757 at sina.com]

I want to use cairo to draw vector-maps, and it shows the strong ability to draw lines and polygons etc., but now I need to texturing a self-defined pattern(may like -^--^--^--^-) along a winding line and fill polygon with it, how should I do? 
Now the drawing program runs both in Android and iOS mobiles written in C.
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