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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">I’ve updated the docs in
<a href="https://github.com/MPEGGroup/OpenFontFormat/issues/20">issue 20</a>:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">The COLR section has been updated to reflect revisions in Google's proposal as well as certain corrections. Here
are the key changes from the previous draft:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#24292E;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo4;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Offsets that were 16-bit have been changed to 24-bit or 32-bit.<o:p></o:p></span></li><li class="MsoNormal" style="color:#24292E;margin-top:3.0pt;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo4;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Related to use of Offset24, ordering of fields in some structures has been changed.<o:p></o:p></span></li><li class="MsoNormal" style="color:#24292E;margin-top:3.0pt;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo4;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">The Affine2x2 structure has been removed.<o:p></o:p></span></li><li class="MsoNormal" style="color:#24292E;margin-top:3.0pt;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo4;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">The transformOffset field in the PaintRadialGradient structure is removed.<o:p></o:p></span></li><li class="MsoNormal" style="color:#24292E;margin-top:3.0pt;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo4;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Ordering of some paint tables (which type has which format number) has been updated.<o:p></o:p></span></li><li class="MsoNormal" style="color:#24292E;margin-top:3.0pt;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo4;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">The previous draft mentioned certain expected relationships between paint tables. These was based on my incomplete understanding of the model Google was using and have been removed.<o:p></o:p></span></li><li class="MsoNormal" style="color:#24292E;margin-top:3.0pt;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo4;background:white">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">Discussion of the bounding box for colour glyphs in the BaseGlyphV1List has been added.<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">Also, the Font File section has been added to the collection of docs. There is only a small change: addition of
the Offset24 data type.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Peter<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> mpeg-otspec <mpeg-otspec-bounces@lists.aau.at> <b>
On Behalf Of </b>Peter Constable<br>
<b>Sent:</b> Monday, September 28, 2020 2:22 PM<br>
<b>To:</b> MPEG OT Spec list (mpeg-otspec@lists.aau.at) <mpeg-otspec@lists.aau.at><br>
<b>Subject:</b> [MPEG-OTSPEC] proposal: COLR extension<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve created an issue in the repo for discussion: <a href="https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FMPEGGroup%2FOpenFontFormat%2Fissues%2F20&data=02%7C01%7C%7C18ea26753dad481dca1508d863f49418%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637369249390786671&sdata=5DbOJ97CdqSgrJ6gFYd%2BcXDb1SNq2i7b%2FFotOdkX%2BI4%3D&reserved=0">
Proposal: extension to COLR table (COLR v1)</a>.<o:p></o:p></p>
<div style="border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 1.0pt 0in">
<p class="MsoNormal"><o:p> </o:p></p>
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<p style="margin-bottom:12.0pt;background:white"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">Google has prepared a <a href="https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fgooglefonts%2Fcolr-gradients-spec%2Ftree%2Frs&data=02%7C01%7C%7C18ea26753dad481dca1508d863f49418%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637369249390796662&sdata=pEVVLwzglJ6gj3b62myG5vrxIdDiGeEoupkAUbnOnNo%3D&reserved=0"><span style="color:#0366D6">proposal</span></a> to
extend the COLR table with significantly enhanced capabilities. This followed from initial discussion at a meeting in 2019 that included people from various companies, with a general consensus to proceed. I was commissioned by Google to adapt that into proposed
revisions to the OpenType spec and to OFF.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">Attached are preliminary drafts related to this:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#24292E;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3;background:white;box-sizing: border-box">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">revisions to the COLR section—the bulk of the changes<o:p></o:p></span></li><li class="MsoNormal" style="color:#24292E;margin-top:3.0pt;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3;background:white;box-sizing: border-box">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">revisions to the Variations Common Table Formats section<o:p></o:p></span></li><li class="MsoNormal" style="color:#24292E;margin-top:3.0pt;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3;background:white;box-sizing: border-box">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">revisions to the CPAL section<o:p></o:p></span></li></ul>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">Two variants for each are attached: one showing changes from OpenType 1.8.3, which would be approximately the same as changes from OFF:2019 + Amd1; and one showing the net result,
with line numbering for easy reference.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">Google and I are proposing that this be the basis for a proposed new edition of OFF.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">Note: There is not a new edition in ISO's balloting process yet. That means that the technical content is not yet final, wrt ISO process. Assuming work on a new edition were approved
at the next WG3 and SC29 meetings, technical balloting on the new edition would go well into 2021.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">The draft for the proposed COLR table revisions is not yet complete, but there's enough in place that should allow a technical reader to get a pretty good understanding of proposed
new structures and how they work. Also, the specifics on how the color gradation is calculated for a radial gradient have yet to be added, but the description of the structure used for it should, I think, give a clear idea of what the capabilities are. Some
visual examples are forthcoming that will provide greater clarity.<o:p></o:p></span></p>
<div style="border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 1.0pt 0in">
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E">The Google proposal was prepared by Behdad Esfahbod, Dominik Röttsches, and Rod Sheeter, with input and review feedback from several others including: Dave Crossland, Laurence Penney,
Adam Twardoch, Cosimo Lupo, Rossen, Atanassov, Roel Nieskens, "Pomax", "bungeman", and myself. (Apologies if I missed anyone.)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Peter<o:p></o:p></p>
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