[MPEG-OTSPEC] 'opbd' feature

[John Hudson]

On 16092020 2:50 pm, Peter Constable wrote:
>
> Since Adobe had registered this feature, I asked them to investigate 
> and come up with a recommendation. Sairus has just provided Adobe’s 
> recommendation in the issue discussion:
>
> “Adobe would like ‘opbd’ and its minions ‘lfbd’ & ‘rtbd’ to be marked 
> as deprecated in the features registry.”
>
> I’d like to hear from others if they would support or, at least, have 
> no objection to these being marked as deprecated.
>
I am 100% okay with opbd being deprecated.

The individual lfbd and rtbd features are, however, potentially useful 
without opbd if rewritten and, indeed, could constitute part of a model 
that might also involve tpbd (top) and (btbd) bottom optical bounds 
features for vertical text. The error of the original feature 
registration was the idea that a single feature was needed to be able to 
apply the others, as a kind of gateway between application function and 
the individual features and their lookups. The idea of using GPOS to 
define margin alignment isn't a terrible one in itself, especially for 
some scripts and styles that are not well served by algorithmic margin 
alignment such as currently available in InDesign.

That said, implementation of GPOS optical margin alignment, in both 
fonts and applications, requires some significant work, which I'm not 
holding my breath awaiting. I would rather, however, consider these 
features potential or pending, rather than deprecated. It would be silly 
to formally deprecate them and then decide down the road that we'd 
actually like to use them.

JH


-- 

John Hudson
Tiro Typeworks Ltd    www.tiro.com
Salish Sea, BC        tiro at tiro.com

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