On 19/2/13 23:35, Lóránt Pintér wrote:
Using ZWNJ would be a great way of fixing it. And indeed it splits the
ligature all right, but it also destroys the kerning. Here's a little
test I did with HarfBuzz @ e0486fc1affd3796fb8f664e2e7fc208f1d2106c:
(the font has an "fi" ligature, and has some kerning between "F" and ",")
Splitting the ligature with the ZWNJ works:
Shaped "fif\u200Ci" with features: [ ]
Glyph: #682, x_advance: 652
Glyph: #71, x_advance: 380
Glyph: #3, x_advance: 0
Glyph: #74, x_advance: 292
Kerning across the ZWNJ does not:
Shaped "F,F\u200C," with features: [ ]
Glyph: #39, x_advance: 483
Glyph: #13, x_advance: 242
Glyph: #39, x_advance: 563
Glyph: #3, x_advance: 0
Glyph: #13, x_advance: 242
Is it possible that doing this will be supported later in HarfBuzz?
Hmm - is that font using a legacy 'kern' table, or a GPOS 'kern'
feature? For the former, I can understand that kerning would break, as
it's a naïve glyph-pair lookup, but for the latter, I thought we should
now ignore the ZWNJ.
JK
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