bugFree UCS Outline Fonts - Bugs: bug #54003, ' RQD' tags in lookups


bug #54003: ' RQD' tags in lookups

Submitted by:  Steve White <Stevan_White>
Submitted on:  Tue 29 May 2018 08:47:59 AM UTC  
Category:  overall font problem Severity:  3 - Normal
Item Group:  character substitution issue Status:  Fixed
Privacy:  Public Assigned to:  Steve White <Stevan_White>
Open/Closed:  Closed Release:  development

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Sun 09 Jun 2019 03:34:30 PM UTC, comment #2: 

Hi Emmanuel,

Sorry for the delayed reply.

Near as I can tell, I since removed all ' RQD' tags from all the fonts.

Since you provided some explanation for the appearance of the thing, I'll call the issue closed.


Steve White <Stevan_White>
Project AdministratorIn charge of this item.
Tue 28 May 2019 01:59:50 AM UTC, comment #1: 

' RQD' is not an actual tag, it is a FontForge-specific manner to define a “required feature”, as defined in the OpenType spec. It should never appear in an actual generated .otf or .ttf or any other compiled font file.
If I understand correctly, a required feature can’t be disabled, as opposed to the others that have a feature tag, and are deemed “optional” at this point of the spec even if some are on by default (and are necessary for e.g. Indic scripts).

When should it be used?
I don’t think the spec discusses it at all, the only occurrences of “required feature” I have been able to find int it refer to tagged features that are being applied as required features (can’t be disabled) for a given language system.

Emmanuel Vallois <emmanuel_vallois>
Tue 29 May 2018 08:47:59 AM UTC, original submission:  

General problem

FontForge and its documentation refer to a feature tag ' RQD', which is described as a "required feature".  But it is not listed as a standard OpenType feature tag.  The tag is used in several places in GNU FreeFont.

Some font checking programs flag this tag as an error.

When should it be used?

Steve White <Stevan_White>
Project AdministratorIn charge of this item.


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-06-09 Stevan_White StatusNeed info => Fixed
        Open/ClosedOpen => Closed

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