[MPEG-OTSPEC] CSS WG liaison to SC29 on Open Font Format (from Feb. 2020)

[John Hudson]

On 2024-03-15 8:52 am, Skef Iterum via mpeg-otspec wrote:
>
> Just from a conceptual level, it seems like one thing that would be easy
> to do with an engine but hard to do with an axis is to control the number
> of times the /same/ contracting or expanding mechanism is used on a given
> line. So, to be over-simplistic, if there's a larger "fi" and a 
> smaller "fi" and two
> "fi" candidates on a line, making it so that only one uses the smaller 
> and
> one uses the larger.
>
> Another thing that seems harder to with an axis is to trade off expanding
> and contracting elements. So, for example, if you have a way of making
> "Qu" significantly larger and a way of making "ch" slightly smaller, 
> achieving
> a happy medium increase in length by using both of those.
>
So, for example, if an expansion substitution made the width slightly 
too much for the measure, a contraction substitution elsewhere in the 
line might bring it to where it needs to be? Yes, that seems problematic 
unless the engine is able to apply the JSTF axis selectively within a 
line rather than across the whole line.

JH

-- 

John Hudson
Tiro Typeworks Ltdwww.tiro.com

Tiro Typeworks is physically located on islands
in the Salish Sea, on the traditional territory
of the Snuneymuxw and Penelakut First Nations.

__________

EMAIL HOUR
In the interests of productivity, I am only dealing
with email towards the end of the day, typically
between 4PM and 5PM. If you need to contact me more
urgently, please use other means.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.aau.at/pipermail/mpeg-otspec/attachments/20240315/5226b32a/attachment.htm>