Hagen - Pragma ADE

66
Features
single substitutions or alternates to swap in another rendering so that the dot of the i
stays free of the preceding f. And for some fonts relative positioning can be used to
achieve a ligature effect.
The next examples demonstrate how the liga feature deals with ffi. Possible solutions
are: replace all three at once, replace the first two first and in a next step, combine
a ligature and following character, replace one or more components by variants that have
no interference with the dot of the ‘i’.
\showotfcomposition{dejavu-serif*default at 48pt}{}{ffi}
\showotfcomposition{cambria*default at 48pt}{}{ffi}
\showotfcomposition{lmroman10regular*default at 48pt}{}{ffi}
\showotfcomposition{texgyrepagellaregular*default at 48pt}{}{ffi}
font 71: DejaVuSerif.ttf @ 48.0pt
features analyze=yes, curs=yes, devanagari=yes, extrafeatures=yes,
kern=yes, liga=yes, mark=yes, mkmk=yes, mode=node, script=dflt,
tlig=yes, trep=yes
step 1 ffi
step 2 ffi
result ffi
U+66:fU+66:fU+69:i
feature 'liga', lookup 'ls_l_3_s', replacing U+00066 (f) upto
U+00066 (f) by ligature U+0FB00 (uniFB00) case 2
U+FB00:ffU+69:i
feature 'liga', lookup 'ls_l_4_s', replacing U+0FB00 (uniFB00)
upto U+00069 (i) by ligature U+0FB03 (uniFB03) case 2
U+FB03:ffi
font 72: cambria.ttf @ 48.0pt
features analyze=yes, curs=yes, devanagari=yes, extrafeatures=yes,
kern=yes, liga=yes, mark=yes, mkmk=yes, mode=node, script=latn,
tlig=yes, trep=yes
ffi step 1 U+66:fU+66:fU+69:i