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      1 /*
      2  *
      3  * (C) Copyright IBM Corp.  and others 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 "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<LookupTable> 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
    146