Re: Telcon reminder and agenda for Wednesday Sep. 23

On 23/9/15 16:06, Levantovsky, Vladimir wrote:
> Hello WG,
>
> We will have our telcon today at a regularly scheduled time. I modified
> the WOFF2 spec [1] adding the ‘hmtx’ transform description as the new
> subclause 5.4 – please review and we will discuss it during the call.

I'm not sure if I'll manage to call in this evening - depends on 
unpredictable family factors at home! - so here are my thoughts on this, 
in case I'm not on the call.

> As
> part of this editing cycle I introduced five new conformance requirements:
>
> class="conform ff"id="conform-reservedFlagsMustBeZero"
>
> class="conform at"id="conform-mustCheckLeftSideBearings"
>
> class="conform at"id="conform-mustEliminateLSBs"
>
> class="conform ua"id="conform-mustCheckLSBFlags"

As currently written, ISTM that the draft spec REQUIRES the encoder to 
check the LSBs against the 'glyf' table xMin values, and use transform 
v.1 if they match.

I was assuming the use of this transform would be optional; the encoder 
would always be allowed to use v.0 (i.e. the null transform), even if 
the LSBs are such that one or both of the lsb/leftSideBearing streams 
could be omitted.

JK

>
> class="conform dc"id="mustReconstructLSBs"
>
> I will edit the text plan pages before the call to add them and we will
> need to define the test plans for these new cases.
>
> I also added specific references to transform version “0” for glyf and
> loca tables but I am not sure if this would be sufficient – we may need
> to also add additional requirements to mandate a specific UA behavior
> when an improper transform number is specified for any of the ‘glyf’,
> ‘loca’ or ‘hmtx’ tables.
>
> WebEx call info:
>
> US West Coast - 13:00
>
> US East Coast - 16:00
>
> Central Europe - 22:00
>
> IRC channel is #webfonts, irc://irc.w3.org:6665/webfonts
>
> or http://irc.w3.org/?channels=webfonts
>
> (We will be using IRC for scribing)
>
> Meeting Number: 646 418 341
> Meeting Password: font
>
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> Thank you,
>
> Vlad
>
> [1] http://dev.w3.org/webfonts/WOFF2/spec/
>

Received on Wednesday, 23 September 2015 15:46:49 UTC