Hm, you mean stop movement in backwards compatibility mode but allow
when in "native ClearType" mode?
Yes.
Hm. Let's see if this is as easy as I think it is ;)
What do you mean with `classically hinted fonts'? AFAIK, Arial
doesn't activate native ClearType mode (i.e., setting selector 3,
value 4 with INSTCTRL). Actually, I'm not aware of a single widely
known font that does this, but it will certainly change in the future.
Classical in the sense that it was originally (super)hinted for
black-and-white display, e.g. Arial, Times New Roman, Verdana, Georgia.
The spacing they do looks off when stopping movement on the x-axis.
Fonts developed with ClearType in mind do this a lot less and sometimes
even react to the subpixel positioning GETINFO flag. The trouble is that
I know of no way to tell the two groups apart beforehand.
The "native ClearType" fonts I found on a Windows 10 Update 1511
installation are: Constantia, Corbel, Sitka, Malgun Gothic, Microsoft
JhengHei (Bold and UI Bold), Microsoft YaHei (Bold and UI Bold), SimSun,
NSimSun and Yu Gothic. I found two web fonts, one's name was scrambled,
the other is Neutraface, both are used on the "The New Yorker" site.
PS: TrueType hinting terminology is very confusing.
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