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Re: Zero width joiner can be omitted from GSUB?
HarfBuzz skips ZWJ and few other control code points (like soft hyphen) when applying GSUB lookups to better match the Unicode expected behavior. AFAIK no other commonly used layout engine does that.2 -
Re: How many glyphs sequence can an OpenType lookup/feature include?
You are probably pre-maturely optimizing here. Shaping is not usually that slow, even for relatively big paragraphs.Shaping a filewith 20574 words (one per line), using hb-shape utility from HarfBuzz…1 -
Re: How many glyphs sequence can an OpenType lookup/feature include?
See this discussion https://github.com/harfbuzz/harfbuzz/issues/14631 -
Re: Windows doesn't use bitmaps embedded in .TTF/.OTF (FontForge)
My mistake. OTS silently drops the tables it does not support, so you want see anything in the console in this case.1 -
Re: Windows doesn't use bitmaps embedded in .TTF/.OTF (FontForge)
Most likely OTS in Firefox and Chrome is dropping the bitmap tables, you should get something about this in the browser console.2
