source/layout/ContextualGlyphSubstProc2.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp.  and others 1998-2016 - All Rights Reserved
   4  *
   5  */
   6
   7 #include "LETypes.h"
   8 #include "MorphTables.h"
   9 #include "StateTables.h"
  10 #include "MorphStateTables.h"
  11 #include "SubtableProcessor2.h"
  12 #include "StateTableProcessor2.h"
  13 #include "ContextualGlyphSubstProc2.h"
  14 #include "LEGlyphStorage.h"
  15 #include "LESwaps.h"
  16
  17 U_NAMESPACE_BEGIN
  18
  19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphSubstitutionProcessor2)
  20
  21 ContextualGlyphSubstitutionProcessor2::ContextualGlyphSubstitutionProcessor2(
  22                                   const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)
  23   : StateTableProcessor2(morphSubtableHeader, success), contextualGlyphHeader(morphSubtableHeader, success)
  24 {
  25     if(LE_FAILURE(success)) return;
  26     le_uint32 perGlyphTableOffset = SWAPL(contextualGlyphHeader->perGlyphTableOffset);
  27     perGlyphTable = LEReferenceToArrayOf<le_uint32> (stHeader, success, perGlyphTableOffset, LE_UNBOUNDED_ARRAY);
  28     entryTable = LEReferenceToArrayOf<ContextualGlyphStateEntry2>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);
  29 }
  30
  31 ContextualGlyphSubstitutionProcessor2::~ContextualGlyphSubstitutionProcessor2()
  32 {
  33 }
  34
  35 void ContextualGlyphSubstitutionProcessor2::beginStateTable()
  36 {
  37     markGlyph = 0;
  38 }
  39
  40 le_uint16 ContextualGlyphSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph,
  41     EntryTableIndex2 index, LEErrorCode &success)
  42 {
  43     if(LE_FAILURE(success)) return 0;
  44     const ContextualGlyphStateEntry2 *entry = entryTable.getAlias(index, success);
  45     if(LE_FAILURE(success)) return 0;
  46     le_uint16 newState = SWAPW(entry->newStateIndex);
  47     le_uint16 flags = SWAPW(entry->flags);
  48     le_int16 markIndex = SWAPW(entry->markIndex);
  49     le_int16 currIndex = SWAPW(entry->currIndex);
  50
  51     if (markIndex != -1) {
  52         le_uint32 offset = SWAPL(perGlyphTable(markIndex, success));
  53         LEGlyphID mGlyph = glyphStorage[markGlyph];
  54         TTGlyphID newGlyph = lookup(offset, mGlyph, success);
  55         glyphStorage[markGlyph] = LE_SET_GLYPH(mGlyph, newGlyph);
  56     }
  57
  58     if (currIndex != -1) {
  59         le_uint32 offset = SWAPL(perGlyphTable(currIndex, success));
  60         LEGlyphID thisGlyph = glyphStorage[currGlyph];
  61         TTGlyphID newGlyph = lookup(offset, thisGlyph, success);
  62         glyphStorage[currGlyph] = LE_SET_GLYPH(thisGlyph, newGlyph);
  63     }
  64
  65     if (flags & cgsSetMark) {
  66         markGlyph = currGlyph;
  67     }
  68
  69     if (!(flags & cgsDontAdvance)) {
  70         currGlyph += dir;
  71     }
  72
  73     return newState;
  74 }
  75
  76 TTGlyphID ContextualGlyphSubstitutionProcessor2::lookup(le_uint32 offset, LEGlyphID gid, LEErrorCode &success)
  77 {
  78     TTGlyphID newGlyph = 0xFFFF;
  79     if(LE_FAILURE(success))  return newGlyph;
  80     LEReferenceTo<LookupTableBase> lookupTable(perGlyphTable, success, offset);
  81     if(LE_FAILURE(success))  return newGlyph;
  82     le_int16 format = SWAPW(lookupTable->format);
  83
  84     switch (format) {
  85         case ltfSimpleArray: {
  86 #ifdef TEST_FORMAT
  87             // Disabled pending for design review
  88             LEReferenceTo<SimpleArrayLookupTable> lookupTable0(lookupTable, success);
  89             LEReferenceToArrayOf<LookupValue> valueArray(lookupTable0, success, &lookupTable0->valueArray[0], LE_UNBOUNDED_ARRAY);
  90             if(LE_FAILURE(success))  return newGlyph;
  91             TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);
  92             newGlyph = SWAPW(lookupTable0->valueArray(glyphCode, success));
  93 #endif
  94             break;
  95         }
  96         case ltfSegmentSingle: {
  97 #ifdef TEST_FORMAT
  98             // Disabled pending for design review
  99             LEReferenceTo<SegmentSingleLookupTable> lookupTable2 = (SegmentSingleLookupTable *) lookupTable;
 100             const LookupSegment *segment = lookupTable2->lookupSegment(lookupTable2->segments, gid);
 101             if (segment != NULL) {
 102                 newGlyph = SWAPW(segment->value);
 103             }
 104 #endif
 105             break;
 106         }
 107         case ltfSegmentArray: {
 108             //printf("Context Lookup Table Format4: specific interpretation needed!\n");
 109             break;
 110         }
 111         case ltfSingleTable:
 112         {
 113 #ifdef TEST_FORMAT
 114             // Disabled pending for design review
 115             LEReferenceTo<SingleTableLookupTable> lookupTable6 = (SingleTableLookupTable *) lookupTable;
 116             const LEReferenceTo<LookupSingle> segment = lookupTable6->lookupSingle(lookupTable6->entries, gid);
 117             if (segment != NULL) {
 118                 newGlyph = SWAPW(segment->value);
 119             }
 120 #endif
 121             break;
 122         }
 123         case ltfTrimmedArray: {
 124             LEReferenceTo<TrimmedArrayLookupTable> lookupTable8(lookupTable, success);
 125             if (LE_FAILURE(success)) return newGlyph;
 126             TTGlyphID firstGlyph = SWAPW(lookupTable8->firstGlyph);
 127             TTGlyphID glyphCount = SWAPW(lookupTable8->glyphCount);
 128             TTGlyphID lastGlyph  = firstGlyph + glyphCount;
 129             TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);
 130             if ((glyphCode >= firstGlyph) && (glyphCode < lastGlyph)) {
 131               LEReferenceToArrayOf<LookupValue> valueArray(lookupTable8, success, &lookupTable8->valueArray[0], glyphCount);
 132               newGlyph = SWAPW(valueArray(glyphCode - firstGlyph, success));
 133             }
 134         }
 135         default:
 136             break;
 137     }
 138     return newGlyph;
 139 }
 140
 141 void ContextualGlyphSubstitutionProcessor2::endStateTable()
 142 {
 143 }
 144
 145 U_NAMESPACE_END