[MPEG-OTSPEC] B64K: sbix 'dupe' tag

[Behdad Esfahbod]

`DUPE` sounds good to me.

It has also been brought to our attention that newer Apple systems support
a `flip` tag. Should `flip` and a respective `FLIP` also be added to the
proposal?

  https://github.com/fonttools/fonttools/pull/3433

behdad
http://behdad.org/


On Fri, Feb 9, 2024 at 1:58 PM Ned Holbrook via mpeg-otspec <
mpeg-otspec at lists.aau.at> wrote:

> Or stick with the favored convention for SFNT tables and call it 'DUPE' ?
>
> On Feb 9, 2024, at 12:03 PM, Peter Constable via mpeg-otspec <
> mpeg-otspec at lists.aau.at> wrote:
>
> Within the sbix glyph data, graphicType = ‘dupe’ indicates that the data
> that follows is a 16-bit glyph ID. (This type means that the bitmap data of
> the referenced glyph is used for the current glyph ID.) Since the docs
> currently assume that sbix data can be used for >64K glyphs, then I think a
> new tag ‘dp24’ (or ‘dp32’?) should be defined.
>
> In 5.5.7.3, the existing paragraph that begins “The special graphicType of
> ‘dupe’…” could be replaced with the following:
> The special graphicType value 'dupe' and 'dp24' indicate that the data
> field contains a two- or three-byte, big-endian glyph ID. With either type,
> the bitmap data for the indicated glyph shall be used for the current
> glyph. The type 'dp24' shall only be used in fonts that have a MAXP table
> and use 24-bit glyph IDs. If an application supports the ‘sbix’ table but
> does not support 24-bit glyph IDs, glyph data with graphicType = 'dp24' may
> be ignored.
>
>
>
> Peter
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