Re: [ft-devel] GX support now working

[Behdad Esfahbod]

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.


-- 
behdad
http://behdad.org/