[Poppler-bugs] [Bug 78990] PDF Text hinting does not work for embedded otf fonts (CID Type 0C), does work for truetype.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78990

--- Comment #4 from James Cloos <cloos at jhcloos.com> ---
> I've uploaded a corrected PDF as there was a mixup with the fonts I used
> for the example.

I’m interacting with bz via email, and missed the additional comments,
including that update, when I first replied.  Appologies.

b> In brief, the two fonts should render identically, and do when zoomed
b> in close enough.

There is no such thing as identical hinting between CFF and glyf fonts.

How did you generate the instructions for the glyf (aka ttf)? Fontforge?
Ttfautohint?  By hand?

I see that the metrics are different.  Did you lose kerning?

I expect a pdf viewer to disable all hinting for the rendered page.
AFAIK evince follows that philosophy.  But if not, freetype added a new
hinting engine in that last year, contributed by Adobe, which darkens
glyphs at low resolutions.  Perhaps that explains what you see?

Or, the difference between how cubic and quadratic splines render might
be noticible at those p/ex sizes.

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