2022-06-25 00:01:02 +02:00
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#ifndef OT_LAYOUT_GPOS_PAIRPOSFORMAT1_HH
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#define OT_LAYOUT_GPOS_PAIRPOSFORMAT1_HH
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2022-07-07 22:06:44 +02:00
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#include "PairSet.hh"
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2022-06-25 00:01:02 +02:00
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namespace OT {
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namespace Layout {
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2022-06-29 01:26:49 +02:00
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namespace GPOS_impl {
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2022-06-25 00:01:02 +02:00
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struct PairPosFormat1
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{
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protected:
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HBUINT16 format; /* Format identifier--format = 1 */
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Offset16To<Coverage>
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coverage; /* Offset to Coverage table--from
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* beginning of subtable */
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ValueFormat valueFormat[2]; /* [0] Defines the types of data in
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* ValueRecord1--for the first glyph
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* in the pair--may be zero (0) */
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/* [1] Defines the types of data in
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* ValueRecord2--for the second glyph
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* in the pair--may be zero (0) */
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Array16OfOffset16To<PairSet>
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pairSet; /* Array of PairSet tables
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* ordered by Coverage Index */
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public:
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DEFINE_SIZE_ARRAY (10, pairSet);
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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if (!c->check_struct (this)) return_trace (false);
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unsigned int len1 = valueFormat[0].get_len ();
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unsigned int len2 = valueFormat[1].get_len ();
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PairSet::sanitize_closure_t closure =
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{
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valueFormat,
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len1,
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1 + len1 + len2
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};
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return_trace (coverage.sanitize (c, this) && pairSet.sanitize (c, this, &closure));
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}
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bool intersects (const hb_set_t *glyphs) const
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{
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return
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+ hb_zip (this+coverage, pairSet)
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| hb_filter (*glyphs, hb_first)
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| hb_map (hb_second)
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| hb_map ([glyphs, this] (const Offset16To<PairSet> &_)
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{ return (this+_).intersects (glyphs, valueFormat); })
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| hb_any
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;
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}
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void closure_lookups (hb_closure_lookups_context_t *c) const {}
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void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
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{
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if ((!valueFormat[0].has_device ()) && (!valueFormat[1].has_device ())) return;
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auto it =
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+ hb_zip (this+coverage, pairSet)
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| hb_filter (c->glyph_set, hb_first)
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| hb_map (hb_second)
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;
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if (!it) return;
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+ it
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| hb_map (hb_add (this))
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| hb_apply ([&] (const PairSet& _) { _.collect_variation_indices (c, valueFormat); })
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;
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}
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void collect_glyphs (hb_collect_glyphs_context_t *c) const
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{
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if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
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unsigned int count = pairSet.len;
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for (unsigned int i = 0; i < count; i++)
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(this+pairSet[i]).collect_glyphs (c, valueFormat);
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}
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const Coverage &get_coverage () const { return this+coverage; }
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bool apply (hb_ot_apply_context_t *c) const
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{
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TRACE_APPLY (this);
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hb_buffer_t *buffer = c->buffer;
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unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint);
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if (likely (index == NOT_COVERED)) return_trace (false);
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hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
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skippy_iter.reset (buffer->idx, 1);
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unsigned unsafe_to;
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if (!skippy_iter.next (&unsafe_to))
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{
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buffer->unsafe_to_concat (buffer->idx, unsafe_to);
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return_trace (false);
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}
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return_trace ((this+pairSet[index]).apply (c, valueFormat, skippy_iter.idx));
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}
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bool subset (hb_subset_context_t *c) const
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{
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TRACE_SUBSET (this);
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const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
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const hb_map_t &glyph_map = *c->plan->glyph_map;
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auto *out = c->serializer->start_embed (*this);
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if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
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out->format = format;
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out->valueFormat[0] = valueFormat[0];
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out->valueFormat[1] = valueFormat[1];
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if (c->plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
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{
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hb_pair_t<unsigned, unsigned> newFormats = compute_effective_value_formats (glyphset);
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out->valueFormat[0] = newFormats.first;
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out->valueFormat[1] = newFormats.second;
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}
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hb_sorted_vector_t<hb_codepoint_t> new_coverage;
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+ hb_zip (this+coverage, pairSet)
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| hb_filter (glyphset, hb_first)
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| hb_filter ([this, c, out] (const Offset16To<PairSet>& _)
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{
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auto snap = c->serializer->snapshot ();
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auto *o = out->pairSet.serialize_append (c->serializer);
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if (unlikely (!o)) return false;
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bool ret = o->serialize_subset (c, _, this, valueFormat, out->valueFormat);
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if (!ret)
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{
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out->pairSet.pop ();
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c->serializer->revert (snap);
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}
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return ret;
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},
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hb_second)
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| hb_map (hb_first)
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| hb_map (glyph_map)
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| hb_sink (new_coverage)
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;
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out->coverage.serialize_serialize (c->serializer, new_coverage.iter ());
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return_trace (bool (new_coverage));
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}
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hb_pair_t<unsigned, unsigned> compute_effective_value_formats (const hb_set_t& glyphset) const
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{
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unsigned len1 = valueFormat[0].get_len ();
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unsigned len2 = valueFormat[1].get_len ();
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unsigned record_size = HBUINT16::static_size + Value::static_size * (len1 + len2);
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unsigned format1 = 0;
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unsigned format2 = 0;
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for (const Offset16To<PairSet>& _ :
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+ hb_zip (this+coverage, pairSet) | hb_filter (glyphset, hb_first) | hb_map (hb_second))
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{
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const PairSet& set = (this + _);
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const PairValueRecord *record = &set.firstPairValueRecord;
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for (unsigned i = 0; i < set.len; i++)
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{
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if (record->intersects (glyphset))
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{
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format1 = format1 | valueFormat[0].get_effective_format (record->get_values_1 ());
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format2 = format2 | valueFormat[1].get_effective_format (record->get_values_2 (valueFormat[0]));
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}
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record = &StructAtOffset<const PairValueRecord> (record, record_size);
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}
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}
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return hb_pair (format1, format2);
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}
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};
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}
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}
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}
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#endif // OT_LAYOUT_GPOS_PAIRPOSFORMAT1_HH
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