Re: [ft] CFF glyph height doubles with autohinting

[Eben Sorkin]

I cannot open this file. 

Do you have a TTF or OTF perhaps one that has and has not not been hinted yet?

-e.

On Jan 23, 2014, at 8:08 PM, Derek B. Noonburg <address@hidden> wrote:

> I'm seeing an odd case where glyph height in a CFF font doubles with
> autohinting (relative to using the Adobe engine).
> 
> I'm attaching the font in question.  It's a subset that was embedded in
> a PDF file -- the glyphs are various math symbols.
> 
> If I run "ftview 16 f1.cff", and then toggle autohinting on with the 'f'
> key, the glyphs get taller.  Actually it doesn't seem to be 2x -- closer
> to 1.5x taller.
> 
> I believe the shorter height is correct.  I.e., the Adobe CFF engine is
> getting it right, and the autohinter is getting it wrong.
> 
> I have no idea where this font came from -- I received the PDF file from
> a customer, and there's no useful info on how it was generated.  So it's
> also possible that the font is broken.  But I'm not sure how a broken
> font could trick the autohinter into increasing the height by that much.
> 
> I'm using FreeType 2.5.2.
> 
> Thanks for taking a look at this.
> 
> - Derek
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