[cairo] [PATCH] tessellator: Fix boxes tessellator to handle num_boxes <= 1 correctly

[Taekyun Kim]

Hi all,

It looks like that _cairo_bentley_ottmann_tessellate_boxes() does not handle
zero or single box input correctly.

I think clearing 'out' when 'in->num_boxes == 0' would be more correct
rather than just returning CAIRO_STATUS_SUCCESS because we cannot assume
that 'out' is already empty and 'in' and 'out' might be equal.

For a single box input, we should copy 'in' to 'out'. I assumed that
cairo_boxes_t have no empty chunk if it has at least a box (therefore the
first box is at boxes->chunks.base[0]). May I have this assumption though?

Please review my patch and leave some comments.
Thanks.

-- 
Best Regards,
Taekyun Kim
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