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Re: [ft-devel] GX support now working

From: Behdad Esfahbod
Subject: Re: [ft-devel] GX support now working
Date: Thu, 04 Jun 2015 13:39:51 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 15-06-04 12:19 PM, Behdad Esfahbod wrote:
> On 15-06-04 12:15 PM, Alexei Podtelezhnikov wrote:
>> > On Wed, Jun 3, 2015 at 4:28 PM, Behdad Esfahbod <address@hidden> wrote:
>>> >> TrueType fonts have a 'non-zero winding' fill rule, whereas Postscript 
>>> >> has
>>> >> 'even-odd'.  That's what causes the artifacts.
>> > 
>> > FT_OUTLINE_EVEN_ODD_FILL is never set by freeetype. So actually
>> > FreeType always uses non-zero winding rule even for TrueType.
> I thought TrueType *is* non-zero.  I also thought Type1 / CFF are even-odd.

Looking more, looks like both TrueType and Type 1 / CFF use non-zero winding
rule. (I'm relieved!)  TrueType *recommends* that the outer-most outline be
clockwise (solid-to-the-right / fill-right), while Type 1 / CFF recommend the
other way around.  But AFAIU, both are just non-zero at the end, and fonts do
violate that recommendations quite frequently in the wild.


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