[MPEG-OTSPEC] Removal of the CFF and CF2 from OFF standard

John Hudson john at tiro.ca
Thu Oct 8 19:30:37 CEST 2020

On 08102020 9:48 am, Behdad Esfahbod wrote:
> Hence my call to make OFF *complete*, by either deprecating & removing 
> parts that are not complete currently, or add as new work items to 
> spec them.
> Same about script-shaping specifications. For that, I'm proposing new 
> work items to develop script shaping specifications (Indic, Arabic, 
> USE, etc) that are currently NOT part of OFF.

Accepting that rasterisation and layout implementation specs should 
exist, whether they should exist as /part/ of OFF is less obvious to me.

The layout implementation spec is most critical, I think, because having 
different results in shaping and display—using the same input text and 
the same font—on different platforms is unacceptable to everyone. Having 
different rasterisation on different platforms is something we’re used 
to, and ‘acceptable to Adobe’ seems to me an peculiar criterion for 
determining which rasterisation needs to be specified. Does such a 
specification make other rasteriser implementations invalid? What if, 
for a specific platform or device, a non-conformant rasterisation is 
better? So perhaps what we need is an informational specification—/not a 
standard/—that enables reproducible implementation of what the code in 
FreeType does, while not favouring this over other implementations. And 
if not a standard, then ISO isn't the place for it.



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

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