[cairo] reference counting vs garbage collection

[Keith Packard]

Around 15 o'clock on Jan 3, =?UTF-8?B?S3Jpc3RpYW4gSMO4Z3NiZXJn?= wrote:

> Also, I don't think its a good idea to "overload" show_page in this way -
> show_page should introduce a new blank page in a paginated backend and be a
> no-op for single-page media.

As we can't re-write the page image, we really have to know when the page
is complete.  So, the semantics for single-page static media (like PNG
files) appears to resemble the multi-page static media (like PS or PDF) in 
that an end-of-drawing indication is required.  Having the back-end 
implicitly call 'copy_page' if the application hasn't already done so 
seems like a reasonable way to define how the close operation works, even 
if we don't expect applications to call copy_page on their own.

-keith


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