Probably this bug https://github.com/googlei18n/noto-fonts/issues/212 is related.
On Tue, Dec 8, 2015, 2:44 PM Khaled Hosny <khaledho...@eglug.org> wrote: > On Mon, Dec 07, 2015 at 09:13:23PM +0530, Deepak Jois wrote: > > Maybe this is a bit related to Khaled’s question earlier about control > > characters inside ligatures, but I wanted to start a new thread. > > > > When I shape text with Noto Nastaliq, I notice a bunch of zero-width > > glyphs generated > > > > $> hb-unicode-encode U+06CC,U+06C1 | hb-shape notonastaliq.ttf > > [HehFin=1+472|TwoDotsBelowNS=0@310,-383+0|sp2=0+0|BehxIni.outS1=0@0 > ,-68+731] > > > > 1. What is the purpose of these zero-width glyphs? > > That is something internal to the font, they are not glyphs inserted by > HarfBuzz. > > > 2. If I am rendering the shaped output to a PDF file (for e.g. when > > using Harfbuzz with LuaTeX), do I need to care about these zero-width > > glyphs at all? How will they affect rendering > > You should just output the glyph as returned by HarfBuzz, > second-guessing it is likely to be wrong. If a character should be > invisible HarfBuzz will replace it by the space glyph, so you need not > worry about this, unless you really know what you are doing. > > Regards, > Khaled > _______________________________________________ > HarfBuzz mailing list > HarfBuzz@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/harfbuzz >
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