152 lines
4.2 KiB
C++
152 lines
4.2 KiB
C++
#ifndef OT_LAYOUT_GSUB_SINGLESUBSTFORMAT2_HH
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#define OT_LAYOUT_GSUB_SINGLESUBSTFORMAT2_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_impl {
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template <typename Types>
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struct SingleSubstFormat2_4
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{
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protected:
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HBUINT16 format; /* Format identifier--format = 2 */
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typename Types::template OffsetTo<Coverage>
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coverage; /* Offset to Coverage table--from
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* beginning of Substitution table */
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Array16Of<typename Types::HBGlyphID>
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substitute; /* Array of substitute
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* GlyphIDs--ordered by Coverage Index */
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public:
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DEFINE_SIZE_ARRAY (4 + Types::size, substitute);
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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) && substitute.sanitize (c));
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}
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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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auto &cov = this+coverage;
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auto &glyph_set = c->parent_active_glyphs ();
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if (substitute.len > glyph_set.get_population () * 4)
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{
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for (auto g : glyph_set)
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{
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unsigned i = cov.get_coverage (g);
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if (i == NOT_COVERED || i >= substitute.len)
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continue;
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c->output->add (substitute.arrayZ[i]);
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}
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return;
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}
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+ hb_zip (cov, substitute)
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| hb_filter (glyph_set, hb_first)
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| hb_map (hb_second)
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| hb_sink (c->output)
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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, substitute)
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| hb_map (hb_second)
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| hb_sink (c->output)
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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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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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if (unlikely (index >= substitute.len)) return_trace (false);
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if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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{
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c->buffer->sync_so_far ();
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c->buffer->message (c->font,
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"replacing glyph at %u (single substitution)",
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c->buffer->idx);
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}
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c->replace_glyph (substitute[index]);
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if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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{
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c->buffer->message (c->font,
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"replaced glyph at %u (single substitution)",
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c->buffer->idx - 1u);
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}
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return_trace (true);
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}
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template<typename Iterator,
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hb_requires (hb_is_sorted_source_of (Iterator,
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hb_codepoint_pair_t))>
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bool serialize (hb_serialize_context_t *c,
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Iterator it)
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{
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TRACE_SERIALIZE (this);
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auto substitutes =
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+ it
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| hb_map (hb_second)
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;
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auto glyphs =
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+ it
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| hb_map_retains_sorting (hb_first)
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;
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if (unlikely (!c->extend_min (this))) return_trace (false);
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if (unlikely (!substitute.serialize (c, substitutes))) return_trace (false);
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if (unlikely (!coverage.serialize_serialize (c, glyphs))) return_trace (false);
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return_trace (true);
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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 it =
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+ hb_zip (this+coverage, substitute)
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| hb_filter (glyphset, hb_first)
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| hb_filter (glyphset, hb_second)
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| hb_map_retains_sorting ([&] (hb_pair_t<hb_codepoint_t, const typename Types::HBGlyphID &> p) -> hb_codepoint_pair_t
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{ return hb_pair (glyph_map[p.first], glyph_map[p.second]); })
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;
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bool ret = bool (it);
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SingleSubst_serialize (c->serializer, it);
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return_trace (ret);
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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_SINGLESUBSTFORMAT2_HH */
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