[cairo] Question about cairo without a native backend

[Piero B. Contezini]

I have a question about how Cairo works, if anyone can give me a glue
it would be very kind.

I'm compiling cairo for iPhone, it works when I disable all the native
backends, but the result is that I can't get it to render anything. Is
cairo always dependent upon a native backend?

My idea is to use it to draw 2d images, only using the image backend,
but it always give me blank screens, everything seems to work fine,
only the resulting cairo_surface never gets touched.

I've compiled the same code in OSX, without any backend and it doesnt
work too, however, when I activate openGL, it works!

I'm lost here, as my perception is that it should work.

Thanks

Piero