I want to use Cairo graphics library whith Qt, but I can't find any documenattion. I just want to make the GUI whith Qt and use Cairo for drawing graphics in a Qt window.
Recent version of cairo supports Qt by allowing to draw to a surface created with
cairo_qt_surface_create(QPainter *painter): you can inspect the relevant header file here. There's no documentation because this feature is still experimental and disabled by default (you should compile cairo yourself explicitely enabling the Qt support with