1 /*

     2  *

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

     4  *

     5  */

     6 

     7 #include "LETypes.h"

     8 #include "MorphTables.h"

     9 #include "StateTables.h"

    10 #include "MorphStateTables.h"

    11 #include "SubtableProcessor.h"

    12 #include "StateTableProcessor.h"

    13 #include "ContextualGlyphSubstProc.h"

    14 #include "LEGlyphStorage.h"

    15 #include "LESwaps.h"

    16 

    17 U_NAMESPACE_BEGIN

    18 

    19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphSubstitutionProcessor)

    20 

    21 ContextualGlyphSubstitutionProcessor::ContextualGlyphSubstitutionProcessor(const MorphSubtableHeader *morphSubtableHeader)

    22   : StateTableProcessor(morphSubtableHeader)

    23 {

    24     contextualGlyphSubstitutionHeader = (const ContextualGlyphSubstitutionHeader *) morphSubtableHeader;

    25     substitutionTableOffset = SWAPW(contextualGlyphSubstitutionHeader->substitutionTableOffset);

    26 

    27     entryTable = (const ContextualGlyphSubstitutionStateEntry *) ((char *) &stateTableHeader->stHeader + entryTableOffset);

    28 }

    29 

    30 ContextualGlyphSubstitutionProcessor::~ContextualGlyphSubstitutionProcessor()

    31 {

    32 }

    33 

    34 void ContextualGlyphSubstitutionProcessor::beginStateTable()

    35 {

    36     markGlyph = 0;

    37 }

    38 

    39 ByteOffset ContextualGlyphSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)

    40 {

    41     const ContextualGlyphSubstitutionStateEntry *entry = &entryTable[index];

    42     ByteOffset newState = SWAPW(entry->newStateOffset);

    43     le_int16 flags = SWAPW(entry->flags);

    44     WordOffset markOffset = SWAPW(entry->markOffset);

    45     WordOffset currOffset = SWAPW(entry->currOffset);

    46 

    47     if (markOffset != 0) {

    48         const le_int16 *table = (const le_int16 *) ((char *) &stateTableHeader->stHeader + markOffset * 2);

    49         LEGlyphID mGlyph = glyphStorage[markGlyph];

    50         TTGlyphID newGlyph = SWAPW(table[LE_GET_GLYPH(mGlyph)]);

    51 

    52          glyphStorage[markGlyph] = LE_SET_GLYPH(mGlyph, newGlyph);

    53     }

    54 

    55     if (currOffset != 0) {

    56         const le_int16 *table = (const le_int16 *) ((char *) &stateTableHeader->stHeader + currOffset * 2);

    57         LEGlyphID thisGlyph = glyphStorage[currGlyph];

    58         TTGlyphID newGlyph = SWAPW(table[LE_GET_GLYPH(thisGlyph)]);

    59 

    60         glyphStorage[currGlyph] = LE_SET_GLYPH(thisGlyph, newGlyph);

    61     }

    62 

    63     if (flags & cgsSetMark) {

    64         markGlyph = currGlyph;

    65     }

    66 

    67     if (!(flags & cgsDontAdvance)) {

    68         // should handle reverse too!

    69         currGlyph += 1;

    70     }

    71 

    72     return newState;

    73 }

    74 

    75 void ContextualGlyphSubstitutionProcessor::endStateTable()

    76 {

    77 }

    78 

    79 U_NAMESPACE_END