On Fri, Jun 18, 2010 at 09:40:55AM +0200, Taco Hoekwater wrote:
> Khaled Hosny wrote:
> >On Fri, Jun 18, 2010 at 09:10:47AM +0200, Taco Hoekwater wrote:
> >>Oliver Buerschaper wrote:
> >>>Do you think it would be a good idea to store a checksum of the
> >>>actual font file used while generating the cache?
> >>This sounds useful. As it will need backend support in luatex,
> >>I will add a tracker item for this.
> >
> >Why? Can't one just store the checksum in the cached lua file, and when
> >loading check if it matches the actual font file, if no discard the
> >cache and reload the file (I thought context is already doing that).
> 
> Sure, but using the backend is more secure. Once the backend opens the
> font file, it cannot be altered any more. In a large document, there may
> be as much as a minute between front end and back end. Using the backend
> is also faster.

Aha, I didn't think about this use case, I was thinking more about a
context cached font changing before processing the document.


-- 
 Khaled Hosny
 Arabic localiser and member of Arabeyes.org team
 Free font developer
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