[cairo] virtual surfaces and composition

Fri May 27 07:46:54 UTC 2016

On Thu, 10 Dec 2015 10:28:46 +1300, I wrote:

> Someone added a region object to Cairo, but it doesn’t seem to be
> used for anything.

Just discovered another way in which regions were clearly an
afterthought in the Cairo API: there is no
cairo_region_get_reference_count. It is the only reference-counted
object in Cairo to be missing a get-reference-count call.