131 lines
4.2 KiB
C++
131 lines
4.2 KiB
C++
#ifndef OT_LAYOUT_GSUB_ALTERNATESUBSTFORMAT1_HH
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#define OT_LAYOUT_GSUB_ALTERNATESUBSTFORMAT1_HH
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#include "AlternateSet.hh"
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#include "Common.hh"
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namespace OT {
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namespace Layout {
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namespace GSUB {
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struct AlternateSubstFormat1
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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 Substitution table */
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Array16OfOffset16To<AlternateSet>
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alternateSet; /* Array of AlternateSet tables
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* ordered by Coverage Index */
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public:
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DEFINE_SIZE_ARRAY (6, alternateSet);
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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 (coverage.sanitize (c, this) && alternateSet.sanitize (c, this));
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}
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inline bool is_inplace () const { return true; }
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bool intersects (const hb_set_t *glyphs) const
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{ return (this+coverage).intersects (glyphs); }
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bool may_have_non_1to1 () const
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{ return false; }
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void closure (hb_closure_context_t *c) const
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{
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+ hb_zip (this+coverage, alternateSet)
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| hb_filter (c->parent_active_glyphs (), hb_first)
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| hb_map (hb_second)
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| hb_map (hb_add (this))
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| hb_apply ([c] (const AlternateSet &_) { _.closure (c); })
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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_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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+ hb_zip (this+coverage, alternateSet)
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| hb_map (hb_second)
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| hb_map (hb_add (this))
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| hb_apply ([c] (const AlternateSet &_) { _.collect_glyphs (c); })
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;
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}
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const Coverage &get_coverage () const { return this+coverage; }
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bool would_apply (hb_would_apply_context_t *c) const
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{ return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; }
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unsigned
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get_glyph_alternates (hb_codepoint_t gid,
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unsigned start_offset,
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unsigned *alternate_count /* IN/OUT. May be NULL. */,
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hb_codepoint_t *alternate_glyphs /* OUT. May be NULL. */) const
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{ return (this+alternateSet[(this+coverage).get_coverage (gid)])
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.get_alternates (start_offset, alternate_count, alternate_glyphs); }
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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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unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint);
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if (likely (index == NOT_COVERED)) return_trace (false);
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return_trace ((this+alternateSet[index]).apply (c));
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}
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bool serialize (hb_serialize_context_t *c,
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hb_sorted_array_t<const HBGlyphID16> glyphs,
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hb_array_t<const unsigned int> alternate_len_list,
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hb_array_t<const HBGlyphID16> alternate_glyphs_list)
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{
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TRACE_SERIALIZE (this);
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if (unlikely (!c->extend_min (this))) return_trace (false);
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if (unlikely (!alternateSet.serialize (c, glyphs.length))) return_trace (false);
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for (unsigned int i = 0; i < glyphs.length; i++)
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{
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unsigned int alternate_len = alternate_len_list[i];
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if (unlikely (!alternateSet[i]
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.serialize_serialize (c, alternate_glyphs_list.sub_array (0, alternate_len))))
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return_trace (false);
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alternate_glyphs_list += alternate_len;
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}
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return_trace (coverage.serialize_serialize (c, glyphs));
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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_sorted_vector_t<hb_codepoint_t> new_coverage;
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+ hb_zip (this+coverage, alternateSet)
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| hb_filter (glyphset, hb_first)
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| hb_filter (subset_offset_array (c, out->alternateSet, this), 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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};
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}
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}
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}
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#endif /* OT_LAYOUT_GSUB_ALTERNATESUBSTFORMAT1_HH */
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