/*

 *

 * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved

 *

 */

#ifndef __LOOKUPTABLES_H

#define __LOOKUPTABLES_H

/**

 * \file

 * \internal

 */

#include "LETypes.h"

#include "LayoutTables.h"

U_NAMESPACE_BEGIN

enum LookupTableFormat

{

    ltfSimpleArray      = 0,

    ltfSegmentSingle    = 2,

    ltfSegmentArray     = 4,

    ltfSingleTable      = 6,

    ltfTrimmedArray     = 8

};

typedef le_int16 LookupValue;

struct LookupTable

{

    le_int16 format;

};

struct LookupSegment

{

    TTGlyphID   lastGlyph;

    TTGlyphID   firstGlyph;

    LookupValue value;

};

struct LookupSingle

{

    TTGlyphID   glyph;

    LookupValue value;

};

struct BinarySearchLookupTable : LookupTable

{

    le_int16 unitSize;

    le_int16 nUnits;

    le_int16 searchRange;

    le_int16 entrySelector;

    le_int16 rangeShift;

    const LookupSegment *lookupSegment(const LookupSegment *segments, LEGlyphID glyph) const;

    const LookupSingle *lookupSingle(const LookupSingle *entries, LEGlyphID glyph) const;

};

struct SimpleArrayLookupTable : LookupTable

{

    LookupValue valueArray[ANY_NUMBER];

};

struct SegmentSingleLookupTable : BinarySearchLookupTable

{

    LookupSegment segments[ANY_NUMBER];

};

struct SegmentArrayLookupTable : BinarySearchLookupTable

{

    LookupSegment segments[ANY_NUMBER];

};

struct SingleTableLookupTable : BinarySearchLookupTable

{

    LookupSingle entries[ANY_NUMBER];

};

struct TrimmedArrayLookupTable : LookupTable

{

    TTGlyphID   firstGlyph;

    TTGlyphID   glyphCount;

    LookupValue valueArray[ANY_NUMBER];

};

U_NAMESPACE_END

#endif