[HarfBuzz] bug in `hb_ot_layout_lookup_collect_lookups'

[Werner LEMBERG]

Behdad,


I guess I've found a bug in `hb_ot_layout_lookup_collect_glyphs'.  In
FreeType's `src/autofit/hbshim.c', I'm calling it like this:

  hb_ot_layout_collect_lookups( face,
                                HB_OT_TAG_GSUB,
                                script_tags,
                                NULL,
                                coverage_tags, 
                                gsub_lookups );

Testing it with `lohit_hi.ttf' (version 2.4.1), it returns the
following lookup indices for the `deva' script:

  0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
  26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
  49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
  72 73 74 80 83

However, there are more GSUB lookups, referenced via chained context
lookups, AFAICS.  Example: lookup 76, which gets referenced in
lookup 4.

I presume that this is not intentional behaviour.


    Werner