icuSources/layout/ContextualGlyphSubstProc.cpp

   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