76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
#ifndef OT_LAYOUT_GSUB_SINGLESUBST_HH
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#define OT_LAYOUT_GSUB_SINGLESUBST_HH
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#include "Common.hh"
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#include "SingleSubstFormat1.hh"
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#include "SingleSubstFormat2.hh"
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namespace OT {
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namespace Layout {
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namespace GSUB_impl {
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struct SingleSubst
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{
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protected:
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union {
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HBUINT16 format; /* Format identifier */
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SingleSubstFormat1 format1;
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SingleSubstFormat2 format2;
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} u;
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public:
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template <typename context_t, typename ...Ts>
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typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
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{
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TRACE_DISPATCH (this, u.format);
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if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
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switch (u.format) {
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case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...));
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case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...));
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default:return_trace (c->default_return_value ());
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}
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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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const hb_codepoint_pair_t))>
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bool serialize (hb_serialize_context_t *c,
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Iterator glyphs)
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{
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TRACE_SERIALIZE (this);
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if (unlikely (!c->extend_min (u.format))) return_trace (false);
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unsigned format = 2;
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unsigned delta = 0;
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if (glyphs)
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{
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format = 1;
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auto get_delta = [=] (hb_codepoint_pair_t _)
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{ return (unsigned) (_.second - _.first) & 0xFFFF; };
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delta = get_delta (*glyphs);
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if (!hb_all (++(+glyphs), delta, get_delta)) format = 2;
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}
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u.format = format;
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switch (u.format) {
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case 1: return_trace (u.format1.serialize (c,
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+ glyphs
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| hb_map_retains_sorting (hb_first),
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delta));
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case 2: return_trace (u.format2.serialize (c, glyphs));
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default:return_trace (false);
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}
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}
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};
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template<typename Iterator>
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static void
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SingleSubst_serialize (hb_serialize_context_t *c,
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Iterator it)
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{ c->start_embed<SingleSubst> ()->serialize (c, it); }
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}
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}
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}
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#endif /* OT_LAYOUT_GSUB_SINGLESUBST_HH */
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