<div dir="ltr"><div dir="ltr">On Fri, Nov 1, 2024 at 7:09 PM Skef Iterum via mpeg-otspec <<a href="mailto:mpeg-otspec@lists.aau.at">mpeg-otspec@lists.aau.at</a>> wrote:</div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
<div>On 11/1/24 10:03 AM, Behdad Esfahbod
wrote:</div>
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<li>We will need to consider whether to allow the change
in the PrivateDict as well, and what that means for
fallback (what the first proposal clarifies). All of
this means that this is not the time to be discussing
that change.</li>
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<div>I think multiple vsindex'es are already permitted in
PrivateDict. At least, there's no text saying otherwise. The
relevant text in the spec is:</div>
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<div>"The vsindex operator may be used only once in a
CharString and must precede the first use of the blend
operator."</div>
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I suspect many if not all existing implementations would break if
you tried it<br>
in a PrivateDICT, and it's just something the authors didn't
imagine. There are<br>
a lot of operators that can only be used once to reasonable effect
that don't<br>
make that explicit.<br></div></blockquote><div><br></div><div>I won't jump to that conclusion fast. I brought up this issue back in 2018 or 2019 with then Adobe folks at a meeting I had with them at Adobe. Read Roberts and Dave Arnolds were present, and I remember when I brought this issue up, Dave said it only applies to CharStrings, and multiple vsindex are allowed in Private DICT.</div><div><br></div><div>That said, I just checked the HarfBuzz code written by Michiharu Ariza, and for PrivateDict it allows multiple vsindex'es but only processes the first one.</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
Note that if multiple operators were allowed, you'd need some
language to<br>
sort out which one applied to the CharStrings (e.g. the first one or
the last<br>
one). The language that talks about that relationship is generally
singular.</div></blockquote><div><br></div><div>I would think the last one matters.</div><div><br></div><div>behdad</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
<p>Skef<br>
</p>
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<div>Thanks,</div>
<div>behdad</div>
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<p>Perhaps we can discuss the two editorial(esque) changes
at our next meeting.</p>
<p>Thanks,<br>
</p>
<div>Skef Iterum<br>
Adobe, Inc.<br>
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<div>On 10/22/24 3:17 PM, Behdad Esfahbod via mpeg-otspec
wrote:<br>
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<div>Hi everyone,</div>
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CFF2 has a file size advantage over TrueType-flavored
variable fonts, specially if one doesn't care about
hinting (Android, Apple platforms, etc) but does care
about (uncompressed) size.<br>
<br>
CFF2 also alleviates some other limitations of
variable-fonts built against the gvar table.
Unfortunately, it imposes its own limitations. These
are among the issues I'm going to raise.<br>
<br>
Please see:
<div><br>
</div>
<div> <a href="https://github.com/harfbuzz/boring-expansion-spec/issues/155" target="_blank">https://github.com/harfbuzz/boring-expansion-spec/issues/155</a></div>
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<div>for details of the changes I am proposing.
Ideally, Adobe folks choose to turn these ideas into
proposals and push it through the OFF
standardization / OpenType integration process.
Failing that, we might want to go ahead and do it at
Google</div>
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<div>Thanks,<br>
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<div>
<div dir="ltr" class="gmail_signature">behdad<br>
<a href="http://behdad.org/" target="_blank">http://behdad.org/</a></div>
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