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      1 /*
      2  *
      3  * (C) Copyright IBM Corp. 1998-2013 - 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 LEReferenceTo<MorphSubtableHeader> &morphSubtableHeader, LEErrorCode &success)
     22   : StateTableProcessor(morphSubtableHeader, success), entryTable(), contextualGlyphSubstitutionHeader(morphSubtableHeader, success)
     23 {
     24   contextualGlyphSubstitutionHeader.orphan();
     25   substitutionTableOffset = SWAPW(contextualGlyphSubstitutionHeader->substitutionTableOffset);
     26 
     27 
     28   entryTable = LEReferenceToArrayOf<ContextualGlyphSubstitutionStateEntry>(stateTableHeader, success,
     29                                                                            (const ContextualGlyphSubstitutionStateEntry*)(&stateTableHeader->stHeader),
     30                                                                            entryTableOffset, LE_UNBOUNDED_ARRAY);
     31   int16Table = LEReferenceToArrayOf<le_int16>(stateTableHeader, success, (const le_int16*)(&stateTableHeader->stHeader),
     32                                               0, LE_UNBOUNDED_ARRAY); // rest of the table as le_int16s
     33 }
     34 
     35 ContextualGlyphSubstitutionProcessor::~ContextualGlyphSubstitutionProcessor()
     36 {
     37 }
     38 
     39 void ContextualGlyphSubstitutionProcessor::beginStateTable()
     40 {
     41     markGlyph = 0;
     42 }
     43 
     44 ByteOffset ContextualGlyphSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)
     45 {
     46   LEErrorCode success = LE_NO_ERROR;
     47   const ContextualGlyphSubstitutionStateEntry *entry = entryTable.getAlias(index, success);
     48   ByteOffset newState = SWAPW(entry->newStateOffset);
     49   le_int16 flags = SWAPW(entry->flags);
     50   WordOffset markOffset = SWAPW(entry->markOffset);
     51   WordOffset currOffset = SWAPW(entry->currOffset);
     52 
     53   if (markOffset != 0 && LE_SUCCESS(success)) {
     54     LEGlyphID mGlyph = glyphStorage[markGlyph];
     55     TTGlyphID newGlyph = SWAPW(int16Table.getObject(markOffset + LE_GET_GLYPH(mGlyph), success)); // whew.
     56 
     57     glyphStorage[markGlyph] = LE_SET_GLYPH(mGlyph, newGlyph);
     58   }
     59 
     60   if (currOffset != 0) {
     61     LEGlyphID thisGlyph = glyphStorage[currGlyph];
     62     TTGlyphID newGlyph = SWAPW(int16Table.getObject(currOffset + LE_GET_GLYPH(thisGlyph), success)); // whew.
     63 
     64     glyphStorage[currGlyph] = LE_SET_GLYPH(thisGlyph, newGlyph);
     65   }
     66 
     67     if (flags & cgsSetMark) {
     68         markGlyph = currGlyph;
     69     }
     70 
     71     if (!(flags & cgsDontAdvance)) {
     72         // should handle reverse too!
     73         currGlyph += 1;
     74     }
     75 
     76     return newState;
     77 }
     78 
     79 void ContextualGlyphSubstitutionProcessor::endStateTable()
     80 {
     81 }
     82 
     83 U_NAMESPACE_END
     84