OpenType font variation (V2)

[CyanoHao]

• [x] Migrate to fonttools-based build system ot-builder for better support for variable font.
  • [x] Manipulate CFF directly.
  • [x] ot-builder fixes and improvements.
• [x] Add a rond axis of 0 (not rounded) to 100 (fully rounded, default).
  • [x] CFF2 instancer.
  • [ ] CFF2 → TT conversion.

Formats (TBD)

• OpenType/CFF2, variable font (default)
• OpenType/CFF2, static instance
  • Cooool!
  • But, is it necessary?
• OpenType/CFF1, static instance
• OpenType/TT, variable font
  • Useful.
  • Can be difficult.
  • A “not so accurate” algorithm is better, I think.
• OpenType/TT, static instance
• OpenType/TT, static instance for MS Office
  • Short family names.

Subset releases (TBD)

• OTF w/o features. (~32000 glyphs)
• URO (GBK) character subset w/o features. (~23000 glyphs)
• Hanyi’s W character subset w/o features. (~12000 glyphs)
• Latin/Cyrillic/Greek character subset with features. (based on Source Sans VF)