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

[Simon Cozens]

On 14/03/2024 15:02, John Hudson via mpeg-otspec wrote:
> ‘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?

Sure, starting the JSTF axis at zero was just an example to how 
different things could be done along different expansion values. It 
works mutatis mutandis the other way around: if you want a font that 
runs JSTF=-1000 to JSTF=1000, just arrange for the glyphs to contract or 
switch to condensed shapes at appropriate points along the negative part 
of the axis.

S