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#ifndef OT_LAYOUT_GSUB_ALTERNATESUBST_HH
#define OT_LAYOUT_GSUB_ALTERNATESUBST_HH
#include "AlternateSubstFormat1.hh"
#include "Common.hh"
namespace OT {
namespace Layout {
namespace GSUB_impl {
struct AlternateSubst
{
protected:
union {
HBUINT16 format; /* Format identifier */
AlternateSubstFormat1_2<SmallTypes> format1;
#ifndef HB_NO_BEYOND_64K
AlternateSubstFormat1_2<MediumTypes> format2;
#endif
} u;
public:
template <typename context_t, typename ...Ts>
typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
{
if (unlikely (!c->may_dispatch (this, &u.format))) return c->no_dispatch_return_value ();
TRACE_DISPATCH (this, u.format);
switch (u.format) {
case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...));
#ifndef HB_NO_BEYOND_64K
case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...));
#endif
default:return_trace (c->default_return_value ());
}
}
/* TODO This function is unused and not updated to 24bit GIDs. Should be done by using
* iterators. While at it perhaps using iterator of arrays of hb_codepoint_t instead. */
bool serialize (hb_serialize_context_t *c,
hb_sorted_array_t<const HBGlyphID16> glyphs,
hb_array_t<const unsigned int> alternate_len_list,
hb_array_t<const HBGlyphID16> alternate_glyphs_list)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (u.format))) return_trace (false);
unsigned int format = 1;
u.format = format;
switch (u.format) {
case 1: return_trace (u.format1.serialize (c, glyphs, alternate_len_list, alternate_glyphs_list));
default:return_trace (false);
}
}
/* TODO subset() should choose format. */
};
}
}
}
#endif /* OT_LAYOUT_GSUB_ALTERNATESUBST_HH */
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