gsub

Can I implement this in opentype: an overbar if a "t" is in a word

I'm prototyping a cursive font where, at least on paper, any word with a "t" in it has the crossbar on the t extended to the left and right over letters as long as this fits; verticals in h, l, d, etc. will cut off the bar, so something like:

becomes something like:

I'm not entirely sure how to implement this, though. I was thinking of using many-to-many GSUB rules based on glyph classes, but no matter how I look at it, it turns into needing recursive GSUB behaviour...

1) t [low] ->[t with bar that continues right] [low with left-connecting overbar]

liga GSUB in webfont (otf-cff) works in Firefox, doesn't work in Chrome or IE

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Hey all,

I'm working on an on-page glyphet font generator in JavaScript, and am making decent headway, except I've run into a problem with GSUB ligature substitution...

If you load http://pomax.github.io/CFF-glyphlet-fonts in Firefox, you'll note that the "small" font, without GSUB table, renders the character "~" as a rectangle with a cutout. The second font has a GSUB table for the 'liga' feature with a lookup type 4 to turn the sequence "c,u,s,t,o,m" into "~", http://github.com/Pomax/CFF-glyphlet-fonts/blob/gh-pages/binaries/with%20GSUB/customfont.gsub.ttx#L271, which works in Firefox, but not in Chrome or IE (of course IE doesn't like plain .otf, so the fonts are repackaged as uncompressed WOFF as well, as fallback option).