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Pet peeve: empty .notdef character.

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    RichardWRichardW Posts: 100
    Do all tools define glyph classes and coverages by alphabetic order or brute listing?  In rolling my own compiler, I've found it useful so far to be able to build sets from runs of glyphs in glyph number order.  As to optimising cmaps, it was only in June 2020 that I found that iOS didn't understand one of the cmap format 4 tricks to compact the glyphIdArray.
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    Florian PircherFlorian Pircher Posts: 173
    Which cmap subtable format 4 compression trick does not work on iOS?
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    RichardWRichardW Posts: 100
    Having both idDelta and idRangeOffset non-zero, the trick for using the same part of glyphIndexArray for two different segments.  The problem occurred with iOS 12.4.6 on iPhone 6 and 7.  The font affected is LKLUG_T Version 0.001, available as lklugt_001.ttf.  Other issues were found with it, as mentioned in the change notice at http://wrdingham.co.uk/fonts/lklugt.html, but it was basically working for NFD text with both Windows and HarfBuzz renderers.


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