Looks like the win32 backend hasn't been compiled in several weeks.
Created attachment 10985 [details] [review] Make a quick guess at how extents work now It seems clear that the extent var is neither a pointer, nor does it contain x1,x2... I did not check to see if width/height should be +1
Pushed a fix for this -- there's actually one more thing that needs to be done other than the patch (the call to _cairo_region_boxes_fini needs to pass boxes as the last args)
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