229 lines
7.8 KiB
C++
229 lines
7.8 KiB
C++
#ifndef OT_LAYOUT_GPOS_MARKMARKPOSFORMAT1_HH
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#define OT_LAYOUT_GPOS_MARKMARKPOSFORMAT1_HH
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#include "MarkMarkPosFormat1.hh"
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namespace OT {
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namespace Layout {
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namespace GPOS_impl {
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typedef AnchorMatrix Mark2Array; /* mark2-major--
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* in order of Mark2Coverage Index--,
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* mark1-minor--
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* ordered by class--zero-based. */
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template <typename Types>
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struct MarkMarkPosFormat1_2
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{
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protected:
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HBUINT16 format; /* Format identifier--format = 1 */
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typename Types::template OffsetTo<Coverage>
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mark1Coverage; /* Offset to Combining Mark1 Coverage
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* table--from beginning of MarkMarkPos
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* subtable */
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typename Types::template OffsetTo<Coverage>
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mark2Coverage; /* Offset to Combining Mark2 Coverage
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* table--from beginning of MarkMarkPos
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* subtable */
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HBUINT16 classCount; /* Number of defined mark classes */
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typename Types::template OffsetTo<MarkArray>
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mark1Array; /* Offset to Mark1Array table--from
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* beginning of MarkMarkPos subtable */
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typename Types::template OffsetTo<Mark2Array>
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mark2Array; /* Offset to Mark2Array table--from
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* beginning of MarkMarkPos subtable */
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public:
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DEFINE_SIZE_STATIC (4 + 4 * Types::size);
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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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return_trace (c->check_struct (this) &&
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mark1Coverage.sanitize (c, this) &&
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mark2Coverage.sanitize (c, this) &&
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mark1Array.sanitize (c, this) &&
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mark2Array.sanitize (c, this, (unsigned int) classCount));
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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 (this+mark1Coverage).intersects (glyphs) &&
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(this+mark2Coverage).intersects (glyphs);
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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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+ hb_zip (this+mark1Coverage, this+mark1Array)
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| hb_filter (c->glyph_set, hb_first)
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| hb_map (hb_second)
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| hb_apply ([&] (const MarkRecord& record) { record.collect_variation_indices (c, &(this+mark1Array)); })
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;
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hb_map_t klass_mapping;
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Markclass_closure_and_remap_indexes (this+mark1Coverage, this+mark1Array, *c->glyph_set, &klass_mapping);
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unsigned mark2_count = (this+mark2Array).rows;
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auto mark2_iter =
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+ hb_zip (this+mark2Coverage, hb_range (mark2_count))
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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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hb_sorted_vector_t<unsigned> mark2_indexes;
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for (const unsigned row : mark2_iter)
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{
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+ hb_range ((unsigned) classCount)
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| hb_filter (klass_mapping)
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| hb_map ([&] (const unsigned col) { return row * (unsigned) classCount + col; })
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| hb_sink (mark2_indexes)
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;
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}
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(this+mark2Array).collect_variation_indices (c, mark2_indexes.iter ());
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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+mark1Coverage).collect_coverage (c->input))) return;
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if (unlikely (!(this+mark2Coverage).collect_coverage (c->input))) return;
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}
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const Coverage &get_coverage () const { return this+mark1Coverage; }
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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 mark1_index = (this+mark1Coverage).get_coverage (buffer->cur().codepoint);
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if (likely (mark1_index == NOT_COVERED)) return_trace (false);
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/* now we search backwards for a suitable mark glyph until a non-mark glyph */
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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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skippy_iter.set_lookup_props (c->lookup_props & ~(uint32_t)LookupFlag::IgnoreFlags);
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unsigned unsafe_from;
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if (!skippy_iter.prev (&unsafe_from))
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{
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buffer->unsafe_to_concat_from_outbuffer (unsafe_from, buffer->idx + 1);
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return_trace (false);
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}
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if (!_hb_glyph_info_is_mark (&buffer->info[skippy_iter.idx]))
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{
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buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
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return_trace (false);
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}
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unsigned int j = skippy_iter.idx;
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unsigned int id1 = _hb_glyph_info_get_lig_id (&buffer->cur());
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unsigned int id2 = _hb_glyph_info_get_lig_id (&buffer->info[j]);
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unsigned int comp1 = _hb_glyph_info_get_lig_comp (&buffer->cur());
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unsigned int comp2 = _hb_glyph_info_get_lig_comp (&buffer->info[j]);
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if (likely (id1 == id2))
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{
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if (id1 == 0) /* Marks belonging to the same base. */
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goto good;
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else if (comp1 == comp2) /* Marks belonging to the same ligature component. */
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goto good;
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}
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else
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{
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/* If ligature ids don't match, it may be the case that one of the marks
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* itself is a ligature. In which case match. */
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if ((id1 > 0 && !comp1) || (id2 > 0 && !comp2))
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goto good;
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}
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/* Didn't match. */
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buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
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return_trace (false);
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good:
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unsigned int mark2_index = (this+mark2Coverage).get_coverage (buffer->info[j].codepoint);
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if (mark2_index == NOT_COVERED)
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{
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buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
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return_trace (false);
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}
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return_trace ((this+mark1Array).apply (c, mark1_index, mark2_index, this+mark2Array, classCount, j));
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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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hb_map_t klass_mapping;
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Markclass_closure_and_remap_indexes (this+mark1Coverage, this+mark1Array, glyphset, &klass_mapping);
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if (!klass_mapping.get_population ()) return_trace (false);
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out->classCount = klass_mapping.get_population ();
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auto mark1_iter =
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+ hb_zip (this+mark1Coverage, this+mark1Array)
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| hb_filter (glyphset, hb_first)
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;
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hb_sorted_vector_t<hb_codepoint_t> new_coverage;
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+ mark1_iter
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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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if (!out->mark1Coverage.serialize_serialize (c->serializer, new_coverage.iter ()))
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return_trace (false);
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out->mark1Array.serialize_subset (c, mark1Array, this,
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(this+mark1Coverage).iter (),
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&klass_mapping);
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unsigned mark2count = (this+mark2Array).rows;
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auto mark2_iter =
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+ hb_zip (this+mark2Coverage, hb_range (mark2count))
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| hb_filter (glyphset, hb_first)
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;
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new_coverage.reset ();
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+ mark2_iter
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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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if (!out->mark2Coverage.serialize_serialize (c->serializer, new_coverage.iter ()))
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return_trace (false);
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hb_sorted_vector_t<unsigned> mark2_indexes;
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for (const unsigned row : + mark2_iter
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| hb_map (hb_second))
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{
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+ hb_range ((unsigned) classCount)
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| hb_filter (klass_mapping)
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| hb_map ([&] (const unsigned col) { return row * (unsigned) classCount + col; })
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| hb_sink (mark2_indexes)
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;
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}
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out->mark2Array.serialize_subset (c, mark2Array, this, mark2_iter.len (), mark2_indexes.iter ());
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return_trace (true);
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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_MARKMARKPOSFORMAT1_HH */
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