Re: WOFF-ACTION-196: Review treatment of empty glyphs vs 0-contour glyphs

I'm OK with just rejecting glyphs with bounding boxes for 0 contours.
Another option might be to require encoder to zero out BB for glyphs with 0
contours.

On Tue, Feb 16, 2016 at 1:18 PM, Levantovsky, Vladimir <
Vladimir.Levantovsky@monotype.com> wrote:

> Folks,
>
> After spending some time musing on the subject matter I decided it might
> be a good idea (but you be the judge) to at least mention the degenerate
> case of "glyph with zero outlines" in the spec. One thing leads to another
> and I ended up adding a new conformance test case where an authoring tool
> would have to check that glyph with zero contours has no bounding box (i.e.
> all values are zeros) and reject the input font if this is not the case.
> (see http://dev.w3.org/webfonts/WOFF2/spec/#conform-mustRejectNonEmptyBBox
> )
> Once this check is performed, the existing test case (
> http://dev.w3.org/webfonts/WOFF2/spec/#conform-mustClearEmptyBBox) is now
> extended to cover both empty glyph records and glyphs with zero contours.
>
> I realize that having a glyph record with zero contours is highly unlikely
> (but not impossible) so having the spec mention both cases would be
> justified, if only to prevent an uncertainty associated with the undefined
> cases and possible malicious content.
> Comments?
> (Once I hear you say "Yeah, let's keep this in the spec", my next step
> would be to come up with the test descriptions for both cases.)
>
> On a separate issue regarding our scheduled telcon tomorrow - any progress
> to talk about? Considering that some folks are on vacation this week and
> the low level of WG activities that require group discussions - should we
> cancel the call tomorrow and postpone it until March 2nd? (Reminder - I
> will be traveling next week.)
>
> Thank you,
> Vlad
>
>
> -----Original Message-----
> From: WebFonts Working Group Issue Tracker [mailto:sysbot+tracker@w3.org]
> Sent: Wednesday, February 10, 2016 4:44 PM
> To: public-webfonts-wg@w3.org
> Subject: WOFF-ACTION-196: Review treatment of empty glyphs vs 0-contour
> glyphs
>
> WOFF-ACTION-196: Review treatment of empty glyphs vs 0-contour glyphs
>
> http://www.w3.org/Fonts/WG/track/actions/196
>
> Assigned to: Vladimir Levantovsky
>
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