Re: Specifying font resource size limits in IMSC

I have captured a strawman proposal at:
https://github.com/w3c/imsc/issues/472#issuecomment-531626430

On Thu, Sep 5, 2019 at 12:27 AM Pierre-Anthony Lemieux <pal@sandflow.com>
wrote:

> FYI. As a data point, D-Cinema has the following constraints: one font
> resource that is no larger than 10 MB.
>
> Best,
>
> -- Pierre
>
> On Sun, Sep 1, 2019 at 1:30 PM Pierre-Anthony Lemieux <pal@sandflow.com>
> wrote:
> >
> > Good morning/evening,
> >
> > Issue #472 [1] suggests adding support for font resource to IMSC.
> >
> > IMSC implicitly specifies size limits for image resources through its
> HRM [2].
> >
> > The primary question in my mind is: are there any reason not to
> > specify similar limits on font resources?
> >
> > If not, then some follow-up questions:
> >
> > - what are reasonable limits?
> > - Should the limits be expressed in bytes and/or number of glyphs?
> > - does a font/otf resource need to be processed/downloaded in its
> > entirety if only a subset of glyps are used?
> >
> > I recommend reaching out to other groups for their input, either now
> > or explicitly after FPWD.
> >
> > Looking forward to your feedback.
> >
> > Best,
> >
> > [1] https://www.w3.org/TR/ttml-imsc1.1/#hypothetical-render-model
> > [2] https://github.com/w3c/imsc/issues/472
>