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

[John Hudson]

On 2024-03-13 10:59 am, Simon Cozens via mpeg-otspec wrote:
>
>> How does the axis handle prioritisation of justification techniques?
>
> A combination of Feature Variations ("alternate layers") and per-glyph 
> masters ("intermediate layers") means that you can prioritize 
> different techniques at different parts of the design space.
>
> For example, perhaps at JSTF=0 - JSTF=100 the space glyph expands to 
> its full width; but meanwhile at JSTF=50 the kashida glyph begins to 
> expand until it reaches its full width at JSTF=1000; at JSTF=500 final 
> kafs and final nuns begin to expand; then at JSTF=800 they switch over 
> to swash forms...
>
> With per-glyph masters, one axis can be seen as the union of multiple 
> per-glyphs axes...

Interesting. Will need to think about this.

‘JSTF=0 - JSTF=1000’ implies that justification always means 
expanding-to-fill. Conceptually, the model could handle contraction 
also, I think. Has this been considered in the implementation? I am 
thinking about paragraph level justification, where justification may 
involve re-wrapping text, and designs that have mechanisms that compress 
text horizontally.

JH


-- 

John Hudson
Tiro Typeworks Ltd    www.tiro.com

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

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