[cairo] API Shakeup: A hidden offset for the xlib backend

[Keith Packard]

Around 10 o'clock on Feb 23, Bill Spitzak wrote:

> Isn't this the same as doing a transform before any drawing? I would 
> think a library interested in this could do the correct cairo translate 
> before passing the cairo context to the other code.

Nope.  Device space remains visible to the application and causes mouse 
coordinate translation to break.

Gtk+ creates window-less widgets, this additional offset allows this 
subterfuge to be completely hidden from the application.  The alternative 
is to wrap quite a bit of the cairo API in Gtk+ specific functions, which 
seems like a significantly worse alternative.

-keith


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