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[>64k:layout:MultipleSubst] Implement format 2 

Implements part of https://github.com/be-fonts/boring-expansion-spec/issues/32

Subset is NOT updated to lower format.
This commit is contained in:
Behdad Esfahbod 2022-07-06 13:58:35 -06:00
parent 684c8fcea7
commit a58a48622a
1 changed files with 11 additions and 0 deletions
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11
src/OT/Layout/GSUB/MultipleSubst.hh
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@ -14,6 +14,9 @@ struct MultipleSubst
union {
HBUINT16 format; /* Format identifier */
MultipleSubstFormat1_2<SmallTypes> format1;
#ifndef HB_NO_BORING_EXPANSION
MultipleSubstFormat1_2<MediumTypes> format2;
#endif
} u;
public:
@ -25,10 +28,15 @@ struct MultipleSubst
if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
switch (u.format) {
case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...));
#ifndef HB_NO_BORING_EXPANSION
case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...));
#endif
default:return_trace (c->default_return_value ());
}
}
/* TODO This function is unused and not updated to 24bit GIDs. Should be done by using
* iterators. While at it perhaps using iterator of arrays of hb_codepoint_t instead. */
bool serialize (hb_serialize_context_t *c,
hb_sorted_array_t<const HBGlyphID16> glyphs,
hb_array_t<const unsigned int> substitute_len_list,
@ -43,6 +51,9 @@ struct MultipleSubst
default:return_trace (false);
}
}
/* TODO subset() should choose format. */
};