src/hb-ot-kern-table.hh - third_party/harfbuzz - Git at Google

 /*
  * Copyright © 2017  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
  * all copies of this software.
  *
  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  * DAMAGE.
  *
  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  *
  * Google Author(s): Behdad Esfahbod
  */

 #ifndef HB_OT_KERN_TABLE_HH
 #define HB_OT_KERN_TABLE_HH

 #include "hb-aat-layout-kerx-table.hh"


 /*
  * kern -- Kerning
  * https://docs.microsoft.com/en-us/typography/opentype/spec/kern
  * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6kern.html
  */
 #define HB_OT_TAG_kern HB_TAG('k','e','r','n')


 namespace OT {


 template <typename KernSubTableHeader>
 struct KernSubTableFormat3
 {
   int get_kerning (hb_codepoint_t left, hb_codepoint_t right) const
   {
     hb_array_t<const FWORD> kernValue = kernValueZ.as_array (kernValueCount);
     hb_array_t<const HBUINT8> leftClass = StructAfter<const UnsizedArrayOf<HBUINT8>> (kernValue).as_array (glyphCount);
     hb_array_t<const HBUINT8> rightClass = StructAfter<const UnsizedArrayOf<HBUINT8>> (leftClass).as_array (glyphCount);
     hb_array_t<const HBUINT8> kernIndex = StructAfter<const UnsizedArrayOf<HBUINT8>> (rightClass).as_array (leftClassCount * rightClassCount);

     unsigned int leftC = leftClass[left];
     unsigned int rightC = rightClass[right];
     if (unlikely (leftC >= leftClassCount || rightC >= rightClassCount))
       return 0;
     unsigned int i = leftC * rightClassCount + rightC;
     return kernValue[kernIndex[i]];
   }

   bool apply (AAT::hb_aat_apply_context_t *c) const
   {
     TRACE_APPLY (this);

     if (!c->plan->requested_kerning)
       return false;

     if (header.coverage & header.Backwards)
       return false;

     hb_kern_machine_t<KernSubTableFormat3> machine (*this, header.coverage & header.CrossStream);
     machine.kern (c->font, c->buffer, c->plan->kern_mask);

     return_trace (true);
   }

   bool sanitize (hb_sanitize_context_t *c) const
   {
     TRACE_SANITIZE (this);
     return_trace (c->check_struct (this) &&
 		  c->check_range (kernValueZ,
 				  kernValueCount * sizeof (FWORD) +
 				  glyphCount * 2 +
 				  leftClassCount * rightClassCount));
   }

   protected:
   KernSubTableHeader
 		header;
   HBUINT16	glyphCount;	/* The number of glyphs in this font. */
   HBUINT8	kernValueCount;	/* The number of kerning values. */
   HBUINT8	leftClassCount;	/* The number of left-hand classes. */
   HBUINT8	rightClassCount;/* The number of right-hand classes. */
   HBUINT8	flags;		/* Set to zero (reserved for future use). */
   UnsizedArrayOf<FWORD>
 		kernValueZ;	/* The kerning values.
 				 * Length kernValueCount. */
 #if 0
   UnsizedArrayOf<HBUINT8>
 		leftClass;	/* The left-hand classes.
 				 * Length glyphCount. */
   UnsizedArrayOf<HBUINT8>
 		rightClass;	/* The right-hand classes.
 				 * Length glyphCount. */
   UnsizedArrayOf<HBUINT8>kernIndex;
 				/* The indices into the kernValue array.
 				 * Length leftClassCount * rightClassCount */
 #endif
   public:
   DEFINE_SIZE_ARRAY (KernSubTableHeader::static_size + 6, kernValueZ);
 };

 template <typename KernSubTableHeader>
 struct KernSubTable
 {
   unsigned int get_size () const { return u.header.length; }
   unsigned int get_type () const { return u.header.format; }

   int get_kerning (hb_codepoint_t left, hb_codepoint_t right) const
   {
     switch (get_type ()) {
     /* This method hooks up to hb_font_t's get_h_kerning.  Only support Format0. */
     case 0: return u.format0.get_kerning (left, right);
     default:return 0;
     }
   }

   template <typename context_t, typename ...Ts>
   typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
   {
     unsigned int subtable_type = get_type ();
     TRACE_DISPATCH (this, subtable_type);
     switch (subtable_type) {
     case 0:	return_trace (c->dispatch (u.format0));
 #ifndef HB_NO_AAT_SHAPE
     case 1:	return_trace (u.header.apple ? c->dispatch (u.format1, std::forward<Ts> (ds)...) : c->default_return_value ());
 #endif
     case 2:	return_trace (c->dispatch (u.format2));
 #ifndef HB_NO_AAT_SHAPE
     case 3:	return_trace (u.header.apple ? c->dispatch (u.format3, std::forward<Ts> (ds)...) : c->default_return_value ());
 #endif
     default:	return_trace (c->default_return_value ());
     }
   }

   bool sanitize (hb_sanitize_context_t *c) const
   {
     TRACE_SANITIZE (this);
     if (unlikely (!u.header.sanitize (c) ||
 		  u.header.length < u.header.min_size ||
 		  !c->check_range (this, u.header.length))) return_trace (false);

     return_trace (dispatch (c));
   }

   public:
   union {
   KernSubTableHeader				header;
   AAT::KerxSubTableFormat0<KernSubTableHeader>	format0;
   AAT::KerxSubTableFormat1<KernSubTableHeader>	format1;
   AAT::KerxSubTableFormat2<KernSubTableHeader>	format2;
   KernSubTableFormat3<KernSubTableHeader>	format3;
   } u;
   public:
   DEFINE_SIZE_MIN (KernSubTableHeader::static_size);
 };


 struct KernOTSubTableHeader
 {
   static constexpr bool apple = false;
   typedef AAT::ObsoleteTypes Types;

   unsigned   tuple_count () const { return 0; }
   bool     is_horizontal () const { return (coverage & Horizontal); }

   enum Coverage
   {
     Horizontal	= 0x01u,
     Minimum	= 0x02u,
     CrossStream	= 0x04u,
     Override	= 0x08u,

     /* Not supported: */
     Backwards	= 0x00u,
     Variation	= 0x00u,
   };

   bool sanitize (hb_sanitize_context_t *c) const
   {
     TRACE_SANITIZE (this);
     return_trace (c->check_struct (this));
   }

   public:
   HBUINT16	versionZ;	/* Unused. */
   HBUINT16	length;		/* Length of the subtable (including this header). */
   HBUINT8	format;		/* Subtable format. */
   HBUINT8	coverage;	/* Coverage bits. */
   public:
   DEFINE_SIZE_STATIC (6);
 };

 struct KernOT : AAT::KerxTable<KernOT>
 {
   friend struct AAT::KerxTable<KernOT>;

   static constexpr hb_tag_t tableTag = HB_OT_TAG_kern;
   static constexpr unsigned minVersion = 0u;

   typedef KernOTSubTableHeader SubTableHeader;
   typedef SubTableHeader::Types Types;
   typedef KernSubTable<SubTableHeader> SubTable;

   protected:
   HBUINT16	version;	/* Version--0x0000u */
   HBUINT16	tableCount;	/* Number of subtables in the kerning table. */
   SubTable	firstSubTable;	/* Subtables. */
   public:
   DEFINE_SIZE_MIN (4);
 };


 struct KernAATSubTableHeader
 {
   static constexpr bool apple = true;
   typedef AAT::ObsoleteTypes Types;

   unsigned   tuple_count () const { return 0; }
   bool     is_horizontal () const { return !(coverage & Vertical); }

   enum Coverage
   {
     Vertical	= 0x80u,
     CrossStream	= 0x40u,
     Variation	= 0x20u,

     /* Not supported: */
     Backwards	= 0x00u,
   };

   bool sanitize (hb_sanitize_context_t *c) const
   {
     TRACE_SANITIZE (this);
     return_trace (c->check_struct (this));
   }

   public:
   HBUINT32	length;		/* Length of the subtable (including this header). */
   HBUINT8	coverage;	/* Coverage bits. */
   HBUINT8	format;		/* Subtable format. */
   HBUINT16	tupleIndex;	/* The tuple index (used for variations fonts).
 				 * This value specifies which tuple this subtable covers.
 				 * Note: We don't implement. */
   public:
   DEFINE_SIZE_STATIC (8);
 };

 struct KernAAT : AAT::KerxTable<KernAAT>
 {
   friend struct AAT::KerxTable<KernAAT>;

   static constexpr hb_tag_t tableTag = HB_OT_TAG_kern;
   static constexpr unsigned minVersion = 0x00010000u;

   typedef KernAATSubTableHeader SubTableHeader;
   typedef SubTableHeader::Types Types;
   typedef KernSubTable<SubTableHeader> SubTable;

   protected:
   HBUINT32	version;	/* Version--0x00010000u */
   HBUINT32	tableCount;	/* Number of subtables in the kerning table. */
   SubTable	firstSubTable;	/* Subtables. */
   public:
   DEFINE_SIZE_MIN (8);
 };

 struct kern
 {
   static constexpr hb_tag_t tableTag = HB_OT_TAG_kern;

   bool     has_data () const { return u.version32; }
   unsigned get_type () const { return u.major; }

   bool has_state_machine () const
   {
     switch (get_type ()) {
     case 0: return u.ot.has_state_machine ();
 #ifndef HB_NO_AAT_SHAPE
     case 1: return u.aat.has_state_machine ();
 #endif
     default:return false;
     }
   }

   bool has_cross_stream () const
   {
     switch (get_type ()) {
     case 0: return u.ot.has_cross_stream ();
 #ifndef HB_NO_AAT_SHAPE
     case 1: return u.aat.has_cross_stream ();
 #endif
     default:return false;
     }
   }

   int get_h_kerning (hb_codepoint_t left, hb_codepoint_t right) const
   {
     switch (get_type ()) {
     case 0: return u.ot.get_h_kerning (left, right);
 #ifndef HB_NO_AAT_SHAPE
     case 1: return u.aat.get_h_kerning (left, right);
 #endif
     default:return 0;
     }
   }

   bool apply (AAT::hb_aat_apply_context_t *c) const
   { return dispatch (c); }

   template <typename context_t, typename ...Ts>
   typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
   {
     unsigned int subtable_type = get_type ();
     TRACE_DISPATCH (this, subtable_type);
     switch (subtable_type) {
     case 0:	return_trace (c->dispatch (u.ot, std::forward<Ts> (ds)...));
 #ifndef HB_NO_AAT_SHAPE
     case 1:	return_trace (c->dispatch (u.aat, std::forward<Ts> (ds)...));
 #endif
     default:	return_trace (c->default_return_value ());
     }
   }

   bool sanitize (hb_sanitize_context_t *c) const
   {
     TRACE_SANITIZE (this);
     if (!u.version32.sanitize (c)) return_trace (false);
     return_trace (dispatch (c));
   }

   protected:
   union {
   HBUINT32		version32;
   HBUINT16		major;
   KernOT		ot;
 #ifndef HB_NO_AAT_SHAPE
   KernAAT		aat;
 #endif
   } u;
   public:
   DEFINE_SIZE_UNION (4, version32);
 };

 } /* namespace OT */


 #endif /* HB_OT_KERN_TABLE_HH */
	/*
	* Copyright © 2017 Google, Inc.
	*
	* This is part of HarfBuzz, a text shaping library.
	*
	* Permission is hereby granted, without written agreement and without
	* license or royalty fees, to use, copy, modify, and distribute this
	* software and its documentation for any purpose, provided that the
	* above copyright notice and the following two paragraphs appear in
	* all copies of this software.
	*
	* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
	* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
	* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
	* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
	* DAMAGE.
	*
	* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
	* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
	* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
	* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
	* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
	*
	* Google Author(s): Behdad Esfahbod
	*/

	#ifndef HB_OT_KERN_TABLE_HH
	#define HB_OT_KERN_TABLE_HH

	#include "hb-aat-layout-kerx-table.hh"


	/*
	* kern -- Kerning
	* https://docs.microsoft.com/en-us/typography/opentype/spec/kern
	* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6kern.html
	*/
	#define HB_OT_TAG_kern HB_TAG('k','e','r','n')


	namespace OT {


	template <typename KernSubTableHeader>
	struct KernSubTableFormat3
	{
	int get_kerning (hb_codepoint_t left, hb_codepoint_t right) const
	{
	hb_array_t<const FWORD> kernValue = kernValueZ.as_array (kernValueCount);
	hb_array_t<const HBUINT8> leftClass = StructAfter<const UnsizedArrayOf<HBUINT8>> (kernValue).as_array (glyphCount);
	hb_array_t<const HBUINT8> rightClass = StructAfter<const UnsizedArrayOf<HBUINT8>> (leftClass).as_array (glyphCount);
	hb_array_t<const HBUINT8> kernIndex = StructAfter<const UnsizedArrayOf<HBUINT8>> (rightClass).as_array (leftClassCount * rightClassCount);

	unsigned int leftC = leftClass[left];
	unsigned int rightC = rightClass[right];
	if (unlikely (leftC >= leftClassCount \|\| rightC >= rightClassCount))
	return 0;
	unsigned int i = leftC * rightClassCount + rightC;
	return kernValue[kernIndex[i]];
	}

	bool apply (AAT::hb_aat_apply_context_t *c) const
	{
	TRACE_APPLY (this);

	if (!c->plan->requested_kerning)
	return false;

	if (header.coverage & header.Backwards)
	return false;

	hb_kern_machine_t<KernSubTableFormat3> machine (*this, header.coverage & header.CrossStream);
	machine.kern (c->font, c->buffer, c->plan->kern_mask);

	return_trace (true);
	}

	bool sanitize (hb_sanitize_context_t *c) const
	{
	TRACE_SANITIZE (this);
	return_trace (c->check_struct (this) &&
	c->check_range (kernValueZ,
	kernValueCount * sizeof (FWORD) +
	glyphCount * 2 +
	leftClassCount * rightClassCount));
	}

	protected:
	KernSubTableHeader
	header;
	HBUINT16 glyphCount; /* The number of glyphs in this font. */
	HBUINT8 kernValueCount; /* The number of kerning values. */
	HBUINT8 leftClassCount; /* The number of left-hand classes. */
	HBUINT8 rightClassCount;/* The number of right-hand classes. */
	HBUINT8 flags; /* Set to zero (reserved for future use). */
	UnsizedArrayOf<FWORD>
	kernValueZ; /* The kerning values.
	* Length kernValueCount. */
	#if 0
	UnsizedArrayOf<HBUINT8>
	leftClass; /* The left-hand classes.
	* Length glyphCount. */
	UnsizedArrayOf<HBUINT8>
	rightClass; /* The right-hand classes.
	* Length glyphCount. */
	UnsizedArrayOf<HBUINT8>kernIndex;
	/* The indices into the kernValue array.
	* Length leftClassCount * rightClassCount */
	#endif
	public:
	DEFINE_SIZE_ARRAY (KernSubTableHeader::static_size + 6, kernValueZ);
	};

	template <typename KernSubTableHeader>
	struct KernSubTable
	{
	unsigned int get_size () const { return u.header.length; }
	unsigned int get_type () const { return u.header.format; }

	int get_kerning (hb_codepoint_t left, hb_codepoint_t right) const
	{
	switch (get_type ()) {
	/* This method hooks up to hb_font_t's get_h_kerning. Only support Format0. */
	case 0: return u.format0.get_kerning (left, right);
	default:return 0;
	}
	}

	template <typename context_t, typename ...Ts>
	typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
	{
	unsigned int subtable_type = get_type ();
	TRACE_DISPATCH (this, subtable_type);
	switch (subtable_type) {
	case 0: return_trace (c->dispatch (u.format0));
	#ifndef HB_NO_AAT_SHAPE
	case 1: return_trace (u.header.apple ? c->dispatch (u.format1, std::forward<Ts> (ds)...) : c->default_return_value ());
	#endif
	case 2: return_trace (c->dispatch (u.format2));
	#ifndef HB_NO_AAT_SHAPE
	case 3: return_trace (u.header.apple ? c->dispatch (u.format3, std::forward<Ts> (ds)...) : c->default_return_value ());
	#endif
	default: return_trace (c->default_return_value ());
	}
	}

	bool sanitize (hb_sanitize_context_t *c) const
	{
	TRACE_SANITIZE (this);
	if (unlikely (!u.header.sanitize (c) \|\|
	u.header.length < u.header.min_size \|\|
	!c->check_range (this, u.header.length))) return_trace (false);

	return_trace (dispatch (c));
	}

	public:
	union {
	KernSubTableHeader header;
	AAT::KerxSubTableFormat0<KernSubTableHeader> format0;
	AAT::KerxSubTableFormat1<KernSubTableHeader> format1;
	AAT::KerxSubTableFormat2<KernSubTableHeader> format2;
	KernSubTableFormat3<KernSubTableHeader> format3;
	} u;
	public:
	DEFINE_SIZE_MIN (KernSubTableHeader::static_size);
	};


	struct KernOTSubTableHeader
	{
	static constexpr bool apple = false;
	typedef AAT::ObsoleteTypes Types;

	unsigned tuple_count () const { return 0; }
	bool is_horizontal () const { return (coverage & Horizontal); }

	enum Coverage
	{
	Horizontal = 0x01u,
	Minimum = 0x02u,
	CrossStream = 0x04u,
	Override = 0x08u,

	/* Not supported: */
	Backwards = 0x00u,
	Variation = 0x00u,
	};

	bool sanitize (hb_sanitize_context_t *c) const
	{
	TRACE_SANITIZE (this);
	return_trace (c->check_struct (this));
	}

	public:
	HBUINT16 versionZ; /* Unused. */
	HBUINT16 length; /* Length of the subtable (including this header). */
	HBUINT8 format; /* Subtable format. */
	HBUINT8 coverage; /* Coverage bits. */
	public:
	DEFINE_SIZE_STATIC (6);
	};

	struct KernOT : AAT::KerxTable<KernOT>
	{
	friend struct AAT::KerxTable<KernOT>;

	static constexpr hb_tag_t tableTag = HB_OT_TAG_kern;
	static constexpr unsigned minVersion = 0u;

	typedef KernOTSubTableHeader SubTableHeader;
	typedef SubTableHeader::Types Types;
	typedef KernSubTable<SubTableHeader> SubTable;

	protected:
	HBUINT16 version; /* Version--0x0000u */
	HBUINT16 tableCount; /* Number of subtables in the kerning table. */
	SubTable firstSubTable; /* Subtables. */
	public:
	DEFINE_SIZE_MIN (4);
	};


	struct KernAATSubTableHeader
	{
	static constexpr bool apple = true;
	typedef AAT::ObsoleteTypes Types;

	unsigned tuple_count () const { return 0; }
	bool is_horizontal () const { return !(coverage & Vertical); }

	enum Coverage
	{
	Vertical = 0x80u,
	CrossStream = 0x40u,
	Variation = 0x20u,

	/* Not supported: */
	Backwards = 0x00u,
	};

	bool sanitize (hb_sanitize_context_t *c) const
	{
	TRACE_SANITIZE (this);
	return_trace (c->check_struct (this));
	}

	public:
	HBUINT32 length; /* Length of the subtable (including this header). */
	HBUINT8 coverage; /* Coverage bits. */
	HBUINT8 format; /* Subtable format. */
	HBUINT16 tupleIndex; /* The tuple index (used for variations fonts).
	* This value specifies which tuple this subtable covers.
	* Note: We don't implement. */
	public:
	DEFINE_SIZE_STATIC (8);
	};

	struct KernAAT : AAT::KerxTable<KernAAT>
	{
	friend struct AAT::KerxTable<KernAAT>;

	static constexpr hb_tag_t tableTag = HB_OT_TAG_kern;
	static constexpr unsigned minVersion = 0x00010000u;

	typedef KernAATSubTableHeader SubTableHeader;
	typedef SubTableHeader::Types Types;
	typedef KernSubTable<SubTableHeader> SubTable;

	protected:
	HBUINT32 version; /* Version--0x00010000u */
	HBUINT32 tableCount; /* Number of subtables in the kerning table. */
	SubTable firstSubTable; /* Subtables. */
	public:
	DEFINE_SIZE_MIN (8);
	};

	struct kern
	{
	static constexpr hb_tag_t tableTag = HB_OT_TAG_kern;

	bool has_data () const { return u.version32; }
	unsigned get_type () const { return u.major; }

	bool has_state_machine () const
	{
	switch (get_type ()) {
	case 0: return u.ot.has_state_machine ();
	#ifndef HB_NO_AAT_SHAPE
	case 1: return u.aat.has_state_machine ();
	#endif
	default:return false;
	}
	}

	bool has_cross_stream () const
	{
	switch (get_type ()) {
	case 0: return u.ot.has_cross_stream ();
	#ifndef HB_NO_AAT_SHAPE
	case 1: return u.aat.has_cross_stream ();
	#endif
	default:return false;
	}
	}

	int get_h_kerning (hb_codepoint_t left, hb_codepoint_t right) const
	{
	switch (get_type ()) {
	case 0: return u.ot.get_h_kerning (left, right);
	#ifndef HB_NO_AAT_SHAPE
	case 1: return u.aat.get_h_kerning (left, right);
	#endif
	default:return 0;
	}
	}

	bool apply (AAT::hb_aat_apply_context_t *c) const
	{ return dispatch (c); }

	template <typename context_t, typename ...Ts>
	typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
	{
	unsigned int subtable_type = get_type ();
	TRACE_DISPATCH (this, subtable_type);
	switch (subtable_type) {
	case 0: return_trace (c->dispatch (u.ot, std::forward<Ts> (ds)...));
	#ifndef HB_NO_AAT_SHAPE
	case 1: return_trace (c->dispatch (u.aat, std::forward<Ts> (ds)...));
	#endif
	default: return_trace (c->default_return_value ());
	}
	}

	bool sanitize (hb_sanitize_context_t *c) const
	{
	TRACE_SANITIZE (this);
	if (!u.version32.sanitize (c)) return_trace (false);
	return_trace (dispatch (c));
	}

	protected:
	union {
	HBUINT32 version32;
	HBUINT16 major;
	KernOT ot;
	#ifndef HB_NO_AAT_SHAPE
	KernAAT aat;
	#endif
	} u;
	public:
	DEFINE_SIZE_UNION (4, version32);
	};

	} /* namespace OT */


	#endif /* HB_OT_KERN_TABLE_HH */