Re: [ft] CFF glyph height doubles with autohinting

[Derek B. Noonburg]

Sorry, mistyped that.  Correct URL is:

http://www.glyphandcog.com/tmp/f1.cff

- Derek


On 2014 Jan 23, Derek B. Noonburg wrote:
> I wonder if it got damaged in email.  I didn't have any trouble opening
> it with ftview.  I put a copy up on my web site - maybe that will work
> better:
> 
> http://www.glyphandcog.com/tmp/t1.cff
> 
> The font was embedded in a PDF file I received from a customer.  They
> reported a problem viewing the PDF in Xpdf (glyphs too large), and I was
> able to track it down to the FreeType autohinter.  I unfortunately don't
> have any other versions of the font, or even any info on where the font
> came from.
> 
> - Derek
> 
> 
> On 2014 Jan 23, Eben Sorkin wrote:
>> 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
>>> <f1.cff>_______________________________________________
>>> Freetype mailing list
>>> address@hidden
>>> https://lists.nongnu.org/mailman/listinfo/freetype
>> 
> 
> 
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