[cairo] A hidden offset for the Xlib backend

[Keith Packard]

Around 9 o'clock on Mar 12, Owen Taylor wrote:

> (*) If implementing cairo_surface_set_device_offset() this way, you'd 
> need to document that changing the device offset after creating a
> cairo_t for a surface gives surprising results, since we can't
> change the CTM for the cairo_t at that point. Not a really a practical
> problem, but a little ugly.

It needn't give surprising results; we could document that the function 
ammended the offset by the supplied amount and then invert the matrix 
multiply order so that the translate applied in device space rather than 
user space.

-keith


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