The docs for CGShadingCreateAxial don't mention if the
CGFunctionRef passed to it is retained by the shading or not.
At the moment (10.4.1) it seems that CGShadingCreateAxial is
retaining the CGFunctionRef (or only using it before the create
function returns), as I can release it after passing it to
CGShadingCreateAxial and everything behaves. Is this behaviour
guaranteed, or just an aspect of the current implementation?
Whenever this question pops up, just check the ref count (I'm fairly
sure CFGetRetainCount works for all CG*Ref types) before and after
you pass a ref to some routine that takes a ref. If it goes up by one
(or maybe even more for some reason), then it should be safe to
release it.
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