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#ifndef OT_LAYOUT_GSUB_SUBSTLOOKUPSUBTABLE_HH
#define OT_LAYOUT_GSUB_SUBSTLOOKUPSUBTABLE_HH
#include "Common.hh"
#include "SingleSubst.hh"
#include "MultipleSubst.hh"
#include "AlternateSubst.hh"
#include "LigatureSubst.hh"
#include "ContextSubst.hh"
#include "ChainContextSubst.hh"
#include "ExtensionSubst.hh"
#include "ReverseChainSingleSubst.hh"
namespace OT {
namespace Layout {
namespace GSUB {
struct SubstLookupSubTable
{
friend struct ::OT::Lookup;
friend struct SubstLookup;
protected:
union {
SingleSubst single;
MultipleSubst multiple;
AlternateSubst alternate;
LigatureSubst ligature;
ContextSubst context;
ChainContextSubst chainContext;
ExtensionSubst extension;
ReverseChainSingleSubst reverseChainContextSingle;
} u;
public:
DEFINE_SIZE_MIN (0);
enum Type {
Single = 1,
Multiple = 2,
Alternate = 3,
Ligature = 4,
Context = 5,
ChainContext = 6,
Extension = 7,
ReverseChainSingle = 8
};
template <typename context_t, typename ...Ts>
typename context_t::return_t dispatch (context_t *c, unsigned int lookup_type, Ts&&... ds) const
{
TRACE_DISPATCH (this, lookup_type);
switch (lookup_type) {
case Single: return_trace (u.single.dispatch (c, std::forward<Ts> (ds)...));
case Multiple: return_trace (u.multiple.dispatch (c, std::forward<Ts> (ds)...));
case Alternate: return_trace (u.alternate.dispatch (c, std::forward<Ts> (ds)...));
case Ligature: return_trace (u.ligature.dispatch (c, std::forward<Ts> (ds)...));
case Context: return_trace (u.context.dispatch (c, std::forward<Ts> (ds)...));
case ChainContext: return_trace (u.chainContext.dispatch (c, std::forward<Ts> (ds)...));
case Extension: return_trace (u.extension.dispatch (c, std::forward<Ts> (ds)...));
case ReverseChainSingle: return_trace (u.reverseChainContextSingle.dispatch (c, std::forward<Ts> (ds)...));
default: return_trace (c->default_return_value ());
}
}
bool intersects (const hb_set_t *glyphs, unsigned int lookup_type) const
{
hb_intersects_context_t c (glyphs);
return dispatch (&c, lookup_type);
}
};
}
}
}
#endif /* HB_OT_LAYOUT_GSUB_SUBSTLOOKUPSUBTABLE_HH */
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