Re: The current state of rendering and overlap

[Behdad Esfahbod]

CFF was even-odd. CFF2 is non-zero winding.

behdad
http://behdad.org/

On Tue, Dec 19, 2023 at 9:50 AM Hin-Tak Leung <htl10@users.sourceforge.net> wrote:

This is the same as the winding rule concept (overlap _once_ = wounded twice) ... I seem to remember one of them is even-odd and the other is non-zero, and quite fundamental difference between truetype and cff. 

On Tuesday, 19 December 2023 at 13:54:21 GMT, Alexei Podtelezhnikov <apodtele@gmail.com> wrote:



It's easy enough to add FT_OUTLINE_OVERLAP to any glyph loaded from a

CFF2 font. Whether that makes sense is one thing I'd like advice about.

There's currently no such code.

I would suggest that CFF2 invent a special charstring to mark overlaps
with FT_OUTLINE_OVERLAP only when necessary. Let us know to implement
it in FreeType.

https://www.w3.org/TR/WOFF2/#p1

WOFF2 is moving towards accepting explicit overlap flags. Perhaps CFF2 can spare  a reserved operator or a two-byte operator.