1 /*

     2  *

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

     4  *

     5  */

     6 

     7 #ifndef __LOOKUPTABLES_H

     8 #define __LOOKUPTABLES_H

     9 

    10 /**

    11  * \file

    12  * \internal

    13  */

    14 

    15 #include "LETypes.h"

    16 #include "LayoutTables.h"

    17 

    18 U_NAMESPACE_BEGIN

    19 

    20 enum LookupTableFormat

    21 {

    22     ltfSimpleArray      = 0,

    23     ltfSegmentSingle    = 2,

    24     ltfSegmentArray     = 4,

    25     ltfSingleTable      = 6,

    26     ltfTrimmedArray     = 8

    27 };

    28 

    29 typedef le_int16 LookupValue;

    30 

    31 struct LookupTable

    32 {

    33     le_int16 format;

    34 };

    35 

    36 struct LookupSegment

    37 {

    38     TTGlyphID   lastGlyph;

    39     TTGlyphID   firstGlyph;

    40     LookupValue value;

    41 };

    42 

    43 struct LookupSingle

    44 {

    45     TTGlyphID   glyph;

    46     LookupValue value;

    47 };

    48 

    49 struct BinarySearchLookupTable : LookupTable

    50 {

    51     le_int16 unitSize;

    52     le_int16 nUnits;

    53     le_int16 searchRange;

    54     le_int16 entrySelector;

    55     le_int16 rangeShift;

    56 

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

    58 

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

    60 };

    61 

    62 struct SimpleArrayLookupTable : LookupTable

    63 {

    64     LookupValue valueArray[ANY_NUMBER];

    65 };

    66 

    67 struct SegmentSingleLookupTable : BinarySearchLookupTable

    68 {

    69     LookupSegment segments[ANY_NUMBER];

    70 };

    71 

    72 struct SegmentArrayLookupTable : BinarySearchLookupTable

    73 {

    74     LookupSegment segments[ANY_NUMBER];

    75 };

    76 

    77 struct SingleTableLookupTable : BinarySearchLookupTable

    78 {

    79     LookupSingle entries[ANY_NUMBER];

    80 };

    81 

    82 struct TrimmedArrayLookupTable : LookupTable

    83 {

    84     TTGlyphID   firstGlyph;

    85     TTGlyphID   glyphCount;

    86     LookupValue valueArray[ANY_NUMBER];

    87 };

    88 

    89 U_NAMESPACE_END

    90 #endif