<div dir="ltr"><div dir="ltr">Hi Skef,<br><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jan 24, 2024 at 11:34 AM Skef Iterum <<a href="mailto:skef@skef.org">skef@skef.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
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<div>On 1/24/24 01:05, Dominik Röttsches
wrote:<br>
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<div dir="ltr">Hi Skef,</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Jan 24, 2024 at
10:54 AM Skef Iterum via mpeg-otspec <<a href="mailto:mpeg-otspec@lists.aau.at" target="_blank">mpeg-otspec@lists.aau.at</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I
was looking through the COLR portions of the spec and didn't
find any <br>
guidance on applying transformations to CFF or CFF2 glyph
sources, what <br>
with those formats various horizontal- and vertical-
specific operators.<br>
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<div>What do you mean by: "what with those formats various
horizontal- and vertical- specific operators."?</div>
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<p>E.g. the h* and v* operators such as hlineto, vlineto, hhcurveto
that would need to be converted to different operators in the face
of almost any rotation and some skews. </p>
<p>(An intermediate and "absolute" moveto/lineto/curveto
representation (no relative values) would have the advantage that
all points could have the transformation applied in the same way,
which is why I brought it up.)</p></div></blockquote><div><br></div><div>Yes, in our COLRv1 implementation(s), the path is retrieved at a ppem particular size and then stored into an internal representation before any transformations are applied. In that sense we treat `glyf` and CFF contours the same way, they are retrieved from the respective glyph table, before they are used and placed into the paint operations for COLRv1.</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>
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<p>However, I didn't find a discussion of that sort of issue in the
spec, implying that there's some level of this stuff implicitly
"left to the reader". I'm trying to get a sense for what that
level is so that what I say about hinting can conform to it.<br></p></div></blockquote><div><br></div><div>Ok, let me know if you have any more questions.</div><div><br></div><div>Dominik</div><div> </div><div><br></div><div> </div></div></div>