[cairo] Clarifications Regarding Cairo

[Vignesh Viswanat]

 I am new to cairo and I require a few clarifications regarding it. I need
to know the flow off code when cairo implements any drawing function. For
example in cairo_stroke The last line of code before is
 status = cr->backend->stroke(cr).
 Here does the backend refer to backend surfaces such as a Xlib surface or
win32 surface? or does it refer to something else?

Also is in what specific instances is pixman used by caoio?
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