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#ifndef OT_LAYOUT_GPOS_LIGATUREARRAY_HH
#define OT_LAYOUT_GPOS_LIGATUREARRAY_HH
namespace OT {
namespace Layout {
namespace GPOS_impl {
typedef AnchorMatrix LigatureAttach; /* component-major--
* in order of writing direction--,
* mark-minor--
* ordered by class--zero-based. */
/* Array of LigatureAttach tables ordered by LigatureCoverage Index */
struct LigatureArray : List16OfOffset16To<LigatureAttach>
{
template <typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
bool subset (hb_subset_context_t *c,
Iterator coverage,
unsigned class_count,
const hb_map_t *klass_mapping) const
{
TRACE_SUBSET (this);
const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
auto *out = c->serializer->start_embed (this);
if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
bool ret = false;
for (const auto _ : + hb_zip (coverage, *this)
| hb_filter (glyphset, hb_first))
{
auto *matrix = out->serialize_append (c->serializer);
if (unlikely (!matrix)) return_trace (false);
const LigatureAttach& src = (this + _.second);
auto indexes =
+ hb_range (src.rows * class_count)
| hb_filter ([=] (unsigned index) { return klass_mapping->has (index % class_count); })
;
ret |= matrix->serialize_subset (c,
_.second,
this,
src.rows,
indexes);
}
return_trace (ret);
}
};
}
}
}
#endif /* OT_LAYOUT_GPOS_LIGATUREARRAY_HH */