<trackbot> Date: 20 May 2015

Khaled, did you get an invite to a hangout on your gmail?

action items

<Vlad> https://www.w3.org/Fonts/WG/track/actions/open

<Vlad> New topic: CFF support in WOFF2

<scribe> scribenick: RSheeter

(discussion of ability to optimize cff)

Vlad: if de-subroutinization allows better compression with brotli, would we have to re-sub on receiving end Jungshik: no, but memory use might be greater. Perhaps faster to use as well.
... summary, some parts can be just dumped during encoding to save bytes. Less constraints here (server/fast wkstn).
... impact on decoder is of greater concern. Eg the memory use cost in return for smaller compressed file.

Ken: concur we should not re-subroutinize when decoding
... could be ~10% increase in filesize without re-sub. Also re-sub is *very* slow [potentially hours]. And lots of memory used.

(looking for link to doc about gains from de-sub)

<Vlad> https://docs.google.com/spreadsheets/d/1jvJ3xUOg6rySiAtiXDvAf7Du43XytEBFJCr5YO12F7c/edit#gid=0

Vlad: So 5-10% filesize reduction in output woff2 if we desub. Is it worth adding as a mandatory step? (at cost of larger decompressed file)

Behdad: why Mandatory?

jfkthame: we shouldn't make this mandatory

<Ken_Lunde__Adobe_> I agree that desubroutinized CFFs should not be mandatory.

Vlad: agree; doesn't have to be normative. Maybe add a note to spec that describes tradeoffs of doing this but don't recommend; just informative.

Behdad: just note it in the spec

action to vlad Add description of tradeoffs in cff preprocessing (desub, etc)

<trackbot> Error finding 'to'. You can review and register nicknames at <http://www.w3.org/Fonts/WG/track/users>.

action vlad Add description of tradeoffs in cff preprocessing (desub, etc)

<trackbot> Created ACTION-175 - Add description of tradeoffs in cff preprocessing (desub, etc) [on Vladimir Levantovsky - due 2015-05-27].

Welcome mystery guest!

<cosimolupo> sorry the sip phone is not working.. didn't mean to disturb, please go on.

hmtx preprocessing

Behdad: if lsb is same as glyf we can drop it and save bytes. Easy to rebuild hmtx back from glyf. Low complexity.

Vlad: won't somebody think of the swashes?!

jfkthame: negative lsb would just be reflected in x-min of bbox

Behdad: lsb allows you to move glyf without moving points. Usually lsb == x-min. If the same for all glyfs we can just drop it. Estimated 90%+ use same value.
... That is, of 10 fonts 9 will have *all* lsb == x-min.

Vlad: seems easy; just need to know how to tell decoder it was dropped.

(clarification that there is no per-table transform marker but we do have reserved bits that could be used for flags)

Behdad: maybe we should test run htmx mangling over a test corpus

Vlad: Can we test with Google Fonts? [yes]

action rsheeter Test hmtx transformation over Google Fonts corpus (how many lsb == x-min for all glyfs, what savings)

<trackbot> Created ACTION-176 - Test hmtx transformation over google fonts corpus (how many lsb == x-min for all glyfs, what savings) [on Roderick Sheeter - due 2015-05-27].

Action Items

<Vlad> https://www.w3.org/Fonts/WG/track/actions/open

Vlad: Did you read my diff?

close action-173

<trackbot> Closed action-173.

action-116

<trackbot> action-116 -- David Kuettel to Decoder performance analysis on mobile devices -- due 2015-04-22 -- OPEN

<trackbot> http://www.w3.org/Fonts/WG/track/actions/116

Vlad: summarize your findings

Kuettel: Chrome instrumented. Got data. Compression team hard at work improving numbers. Caveat: environment not entirely controlled (wild users). WOFF1 could be optimistic in some cases.

[we may have lost audio]

unfortunately we have now disconnected Khaled :(

Vlad: can we measure how smaller file vs slower decode might play out (eg are we ahead)?

Kuettel: will ping Kenji

(exploration of further testing, ways to get overall latency impact)

action-148

<trackbot> action-148 -- Vladimir Levantovsky to Review and edit the conformance test for extraneous data -- due 2015-05-06 -- OPEN

<trackbot> http://www.w3.org/Fonts/WG/track/actions/148

action-168

<trackbot> action-168 -- Roderick Sheeter to Measure RAM usage for woff2 vs. woff1 -- due 2015-05-13 -- OPEN

<trackbot> http://www.w3.org/Fonts/WG/track/actions/168

Vlad: Everyone please review all normative statements to ensure they are testable

Victory declared over action items

CTS

[more or less out of time]

Vlad: Ken want to come to Boston?

Ken: bit difficult

[next f2f after Boston will be ATypI. Come one, come all]

Ken: Maybe David Lemon could come to atypi f2f

This is scribe.perl Revision: 1.140  of Date: 2014-11-06 18:16:30  
Check for newer version at http://dev.w3.org/cvsweb/~checkout~/2002/scribe/

Guessing input format: RRSAgent_Text_Format (score 1.00)

Found ScribeNick: RSheeter
Inferring Scribes: RSheeter
Default Present: +1.408.927.aaaa, +1.650.214.aabb, [Microsoft], Vlad, jfkthame, +1.650.352.aacc, Ken_Lunde__Adobe_, kuettel+RSHeeter, Behdad, +1.650.253.aadd, +1.650.253.aaee
Present: +1.408.927.aaaa +1.650.214.aabb [Microsoft] Vlad jfkthame +1.650.352.aacc Ken_Lunde__Adobe_ kuettel+RSHeeter Behdad +1.650.253.aadd +1.650.253.aaee
Regrets: John_Hudson Chris_Lilley

WARNING: No meeting chair found!
You should specify the meeting chair like this:
<dbooth> Chair: dbooth

Found Date: 20 May 2015
Guessing minutes URL: http://www.w3.org/2015/05/20-webfonts-minutes.html
People with action items: 

WARNING: Input appears to use implicit continuation lines.
You may need the "-implicitContinuations" option.