Re: Specifying font resource size limits in IMSC

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

Received on Wednesday, 4 September 2019 15:28:13 UTC