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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Sitka Text"">Through a combination of the GETINFO instruction and the INSTCTRL instruction, glyphs or fonts can make educated decisions about whether to apply instructions under different circumstances
such as rotations, stretching, &c. Typically we recommend in the pre-program to disable hints under rotation, but if someone comes up with a clever algorithm for handling this, that is an option.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Sitka Text""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Sitka Text"">GregH<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Sitka Text""><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> mpeg-otspec <mpeg-otspec-bounces@lists.aau.at>
<b>On Behalf Of </b>Skef Iterum via mpeg-otspec<br>
<b>Sent:</b> Friday, January 26, 2024 11:33 AM<br>
<b>To:</b> Laurence Penney <lorp@lorp.org><br>
<b>Cc:</b> mpeg-otspec <mpeg-otspec@lists.aau.at><br>
<b>Subject:</b> Re: [MPEG-OTSPEC] VARC, glyf, and TT-instructions<o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#212121">You don't often get email from
<a href="mailto:mpeg-otspec@lists.aau.at">mpeg-otspec@lists.aau.at</a>. <a href="https://aka.ms/LearnAboutSenderIdentification">
Learn why this is important</a><o:p></o:p></span></p>
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<p><o:p> </o:p></p>
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<p class="MsoNormal">On 1/24/24 23:47, Laurence Penney wrote:<o:p></o:p></p>
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<p class="MsoNormal">On 25 Jan 2024, at 01:25, Skef Iterum via mpeg-otspec <a href="mailto:mpeg-otspec@lists.aau.at">
<mpeg-otspec@lists.aau.at></a> wrote:<o:p></o:p></p>
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<p class="MsoNormal">There is a distinction between whether the text path itself is skewed or<br>
rotated and whether a component in a composite is skewed or rotated.<br>
Asking around it seems as though with the existing glyf components<br>
instructions are <i>not</i> automatically turned off when "compositing", but<br>
perhaps that info is wrong. <o:p></o:p></p>
<p>Either way, though, that seems like something the specification should<br>
clarify.<o:p></o:p></p>
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<p class="MsoNormal">I asked similar questions when I was getting my head around TT hinting, and recall being told that skewed or rotated components were not hinted. The person I asked would most likely have been Greg Hitchcock.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Josh Hadley on our team got curious about this and did an experiment or two<br>
in VTT. As far as we can tell there is no automatic disabling of hints when using<br>
"not nice" transformations, at least in that tool. We can provide a specific<br>
example or two if anyone needs them.<br>
<br>
It's possible that the "client side" implementations work differently than the <br>
development tools but designers are likely to take the guidance of those tools<br>
unless there is very strong conventional wisdom pointing in a different<br>
direction.<o:p></o:p></p>
<p>Skef<o:p></o:p></p>
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