FW: [Proposal] Improve the definition of the 'CFF ' table

[Levantovsky, Vladimir]

Dear all,

A proposal to improve the definition of the CFF table was submitted to the public OpenType email list (see below). I would like to ask for your opinion - I believe that the proposed clarification is useful and since it attempts to clarify the existing ambiguity in the standard it can be done by corrigendum to the current text of ISO standard.

Thank you,
Vladimir


-----Original Message-----
From: listmaster at indx.co.uk [mailto:listmaster at indx.co.uk] On Behalf Of Manlio Perillo 
Sent: Sunday, November 29, 2009 1:21 PM
To: multiple recipients of OpenType - sent by
Subject: [OpenType] [Proposal] Improve the definition of the 'CFF ' table

Message from OpenType list:


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Hi.

In the current Open Font Format specification, I think that the
definition of the CFF table is not complete.

The current text is:

This table contains a compact representation of a PostScript Type 1, or
CIDFont and is structured according
to Adobe Technical Note #5176: "The Compact Font Format Specification"
[5] and Adobe Technical Note
#5177: "Type 2 Charstring Format" [4].
Existing TrueType fonts use a glyph index to specify and access glyphs
within a font, e.g. to index the loca
table and thereby access glyph data in the glyf table. This concept is
retained in OFF PostScript fonts except
that glyph data is accessed through the CharStrings INDEX of the CFF table.



I propose the following text to be added:

Although CFF enables multiple font or CIDFont programs to be bundled
together in a single file, the CFF table must consist of exactly one
font or CIDFont (as appropriate for the associated font dictionary).


Note that this text come from the PDF 1.7 Reference, section 5.8, page 468.


I think that other restrictions should be placed on the CFF data
embedded in the CFF table; I have posted a message some time ago.



Manlio Perillo
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