Note that Type 1 and CFF fonts that follow the "Black Book" guidelines and
avoid self-intersecting outlines will render correctly with either fill rule. Adobe
rasterizers typically use even-odd at small sizes and non-zero at larger sizes.
-Dave
On 6/4/2015 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 <beh...@behdad.org> 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.
More so, the outer outline is always filled on the inside regardless of
the direction (ftgrays.c:1285).
Right. That's what non-zero means. Doesn't matter if positive or negative.
FreeType is less sophisticated and resort
to what works the best even for broken fonts.
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