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Re: Internal Error (overlap) for some fonts when running make

From: Werner LEMBERG
Subject: Re: Internal Error (overlap) for some fonts when running make
Date: Tue, 05 Nov 2019 13:53:14 +0100 (CET)

>> Now that Dan has made default make commands 'terser' I am noticing
>> while building our fonts that I see quite a few 'errors' that look
>> like this:
>> Internal Error (overlap) in clefs.petrucci.c5_change:
>>   Winding number did not return to 0 when x=25.9951
>> Internal Error (overlap) in clefs.petrucci.c5_change:
>>   monotonic is >> both needed and unneeded
>> (22.1885,310.434)->(25.9951,304.135). x=25.9951 (prev=8.40259)
>> Of course they have 'always' (probably) been there - I don't want to
>> claim anything like a regression.

It's not a regression, right.

>> But do we need to care?

We should.

> The first is pretty typical for Metafont/Metapost fonts, affecting
> cusps.  The latter looks like there might be a logic error in the
> programming for a variable called "monotonic".  Fixing those kinds
> of bugs would improve confidence in the font creation instructions,
> but the real test is whether people complain about the look of the
> resulting character.

Usually it is not noticeable.

Note that recently I saw some improvements w.r.t. monotonic stuff in
FontForge's git repository.  We thus should do two things for testing.

(1) Use a FontForge binary built from current git.

(2) Report any conversion errors to the FontForge maintainers.
    Hopefully, they now have the expertise to fix something (a few
    years ago, they didn't).


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