[MPEG-OTSPEC] revised B64K glyf table: new tag "LOCX" and "GLYX"

suzuki toshiya mpsuzuki at hiroshima-u.ac.jp
Wed Sep 27 05:07:06 CEST 2023

"LOC2", "GLY2" look good alternative for me, thank you!
Liam, how do you think of?


On 2023/09/27 11:29, Hin-Tak Leung wrote:
> Just a comment on uppercase/lowercase: it isn't mentioned anywhere in the spec I believe, but there was some sort of convention / understanding when Microsoft licensed the truetype font scaler code / tech from Apple, that new tables are to be added in upper-cases, while Apple's older tables were all in lower-cases, and Apple may add new tables in lowercases. Hence the current observed patterns of upper/lowercases. I don't know how legally binding that convention is to either party, or to 3rd parties. Maybe Apple/Microsoft folks can comment on this.
> That said, how about LOC2 / GLY2? If they are related to loca and glyf ? And if that's the case, why aren't they done in a new/expanded version of those?
> On Wednesday, 27 September 2023 at 03:09:15 BST, suzuki toshiya <mpsuzuki at hiroshima-u.ac.jp> wrote:
> Dear Liam,
> You proposed "LOCX" and "GLYX" as the tags for
> the new implementations. The tags "LOCX" and
> "GLYX" are natural for the proposed extension.
> I appreciate.
> But according to a header file of GhostScript/GhostPDL,
> https://github.com/ArtifexSoftware/ghostpdl/blob/master/devices/gxfcopy.h
> I have a concern that "gdir", "locx," and "glyx"
> might have been used in some PostScript documents
> to emit the TrueType font for the generation of PDF.
> Even if "locx" and "glyx" were once used, the
> difference between lowercase/uppercase is
> sufficient to avoid confusion?
> I wish Adobe experts could check whether old
> versions of AdobePS printer drivers used them
> for their internal use.
> Regards,
> mpsuzuki
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