[cairo] font lifetime

[Keith Packard]

Around 12 o'clock on Jan 28, Jost Boekemeier wrote:

> The ps/pdf "file" could also be designed this way: Just give the file
> resource to cairo and let cairo call the "close" function.  Of course
> this doesn't work anymore if a FileProxy exists which tries to "close"
> the font itself.

Output files mutated by the library and application are different from 
resources read by the library like fonts; applications need to have 
synchronous knowledge about when the file is 'done' and, in fact, must be 
able to force completion through the API.  Otherwise, you'll find it quite 
a challenge to print the resulting output; you'd end up doing most of that 
work in a destroy notify function which seems extremely awkward.

-keith


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