Open rimas-kudelis opened 2 weeks ago
The description in the cookbook is what was common practice in fonts at the time. I can't recall 100%, but I think this was a workaround for an implementation issue in InDesign way back when that was the only environment that supported GSUB and GPOS. Again, my memory is fuzzy because this was 20 years ago, but I seem to recall that "Small Caps" (invoking only smcp
) and "All Small Caps" (invoking only c2sc
) were binary options. Duplicating the rules of smcp
into c2sc
was needed for users to get "all" small caps.
Your description in https://github.com/typesupply/opentype-cookbook/blob/8d3a294b5cc1bb2a9dd4996993a4e49d23a7e357/docs/common-techniques.md?plain=1#L255 says that "[
c2cs
] is for situations in which the user wants everything possible, not just letters, to be converted to small cap forms."This description seems not entirely in line with what the OpenType spec says about this feature:
The way I understand it, this feature is not supposed to substitute small letters with small capitals, only capital letters (and okay, maybe numbers too). If it converted everything, acronyms with small letters in the middle (like
IPv6
orLotR
) would end up visually somewhat distorted and potentially even ambigous, and I don't think anyone would want that.