[mpeg-OTspec] Draft text of DIS OFF standard [1 Attachment]

[Sairus Patel]

Vlad,

If additional fields are added to the end of the OS/2 table, as is the case here, then yes the version number should be bumped since that's the mechanism that's been used in the OS/2 and for other minor version fields in OFF [OFF sec. 4.4 "Table version numbers"].

( Looking at the size of the table would be an alternate way to do things, though not as good of a way since it wouldn't handle new information added to the table without the size being changed, e.g. flag bits being added to existing flag fields, where the unset (reserved) needs to be distinguished from the unset (defined and unset) case. )

Sairus

From: <'Levantovsky>, "Vladimir' vladimir.levantovsky at monotype.com<mailto:vladimir.levantovsky at monotype.com> [mpeg-OTspec]" <mpeg-OTspec-noreply at yahoogroups.com<mailto:mpeg-OTspec-noreply at yahoogroups.com>>
Reply-To: Vladimir Levantovsky <Vladimir.Levantovsky at monotype.com<mailto:Vladimir.Levantovsky at monotype.com>>
Date: Wednesday, July 9, 2014 at 5:28 AM
To: "mpeg-OTspec at yahoogroups.com<mailto:mpeg-OTspec at yahoogroups.com>" <mpeg-OTspec at yahoogroups.com<mailto:mpeg-OTspec at yahoogroups.com>>
Subject: [mpeg-OTspec] Draft text of DIS OFF standard [1 Attachment]


[Attachment(s) from Levantovsky, Vladimir included below]
Dear all,

Please see attached the draft text of the DIS version of the OFF (ISO/IEC 14496-22 3rd edition) with all the changes implemented and tracked. Please review the document and let me know by Friday morning if I missed anything.

I'd like to bring up one question related to most recent OS/2 changes - should we up the OS/2 version number?

We added two new data fields (usLowerOpticalPointSize and usUpperOpticalPointSize) in the end of the table. Technically, if we keep the OS/2 version number as is - this change should not affect any existing implementations since they will stop reading the table data after the last known data field and two additional data fields will simply be ignored [and processed only by updated implementations]. However, I believe that while making similar changes in the past we did increase the OS/2 version number - we need to decide if we want to do the same now, with the current changes in place.

Please respond to this email with your suggestions and comments.

Thank you,
Vladimir



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