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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,
hb_sorted_vector_t<hb_codepoint_t> &new_coverage /* OUT */) const
{
TRACE_SUBSET (this);
const hb_map_t &glyph_map = c->plan->glyph_map_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 (glyph_map, hb_first))
{
const LigatureAttach& src = (this + _.second);
bool non_empty = + hb_range (src.rows * class_count)
| hb_filter ([=] (unsigned index) { return klass_mapping->has (index % class_count); })
| hb_map ([&] (const unsigned index) { return !src.offset_is_null (index / class_count, index % class_count, class_count); })
| hb_any;
if (!non_empty) continue;
auto *matrix = out->serialize_append (c->serializer);
if (unlikely (!matrix)) return_trace (false);
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);
hb_codepoint_t new_gid = glyph_map.get (_.first);
new_coverage.push (new_gid);
}
return_trace (ret);
}
};
}
}
}
#endif /* OT_LAYOUT_GPOS_LIGATUREARRAY_HH */