[mpeg-OTspec] Abstract for ISO/IEC 14496-28 CFR

[Ken Lunde]

Suzuki-san,

I am glad to hear that you prefer the revision that I supplied. Some clarifications:

I didn't change the 64K nor 100,000 figures in the revision that I supplied. Those figures remain as-is, mainly because I felt that their use was appropriate. The 64K limit can actually fluctuate somewhat. For example, in CFF, the limit is 64,000 for name-keyed, and 65,535 (CIDs 0 through 65534) for CID-keyed. It also didn't seem appropriate to refer to a specific version of Unicode and its number of characters, because such a statement would become outdated as soon as a new version of Unicode is released.

It would be quite appropriate to use "number of fonts" in terms of TTC contents, because multiple fonts are encapsulated in a single font resource. And, the fact that CFR can support font formats other than OFF suggests that an overarching term, such as "font resource," is appropriate.

Regards...

-- Ken

On Feb 7, 2012, at 10:44 PM, <mpsuzuki at hiroshima-u.ac.jp> wrote:

> I prefer the text revised by Ken; saying "64K" is more
> appropriate than "100,000".
> 
> About the replacement of "a single font" by "a single
> font resource", although ISO/IEC 14496-22 text does
> not use "font resource" as a word to count something
> (e.g. in TTC description, the counted is font, like,
> "number of fonts"), ISO/IEC 14496-28 uses "font resource"
> to mean such, the revised text is more harmonized with
> the mentioned standard.
> 
> Regards,
> suzuki toshiya, Hiroshima University, Japan
> 
> On Mon, 6 Feb 2012 16:26:34 -0800
> Ken Lunde <lunde at adobe.com> wrote:
> 
> >Vladimir,
> >
> >How about the following revision?
> >
> >>Recent additions of new characters that represent most of the world's
> >>writing systems resulted in a significant increase of the Unicode
> >>character repertoire, which now encodes more than 100,000 characters.
> >>However, due to limitations of many bitfields, the existing ISO/IEC
> >>14496-22 "Open Font Format" (OFF) specification allows a single font
> >>resource to support only up to 64K glyphs. In other words, there are
> >>significantly more characters in Unicode than the number of glyphs that
> >>can be included in a single font resource. The ISO/IEC 14496-28
> >>"Composite Font Representation" standard overcomes these limitations by
> >>standardizing an XML-based representation that allows linking of
> >>existing fonts resources -- not limited only to OFF -- into a single
> >>"Composite Font" that can be used as a virtual font.
> >
> >Regards...
> >
> >-- Ken
> >
> >On Feb 6, 2012, at 4:00 PM, Levantovsky, Vladimir wrote:
> >
> >> [Attachment(s) from Levantovsky, Vladimir included below]
> >> 
> >> Dear all,
> >> 
> >> 
> >> 
> >> Please see the attached draft text of the Abstract, which will be
> >published on ISO website (both in ISO online catalog and ISO web
> >store). > 
> >> The text must be finalized by the end of this week and submitted on
> >Friday, Feb., 10 along with the text of the standard. Your comments are
> >very much appreciated; in absence of any comments received I will
> >assume that the abstract is approved and can be submitted as is. > 
> >> 
> >> 
> >> Thank you,
> >> 
> >> Vladimir
> >> 
> >> 
> >> 
> >> 
> >> 
> >
> >
> >
> >------------------------------------
> >
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