C++ LEReferenceTo::isValid方法代码示例

U_NAMESPACE_BEGIN

GlyphIterator::GlyphIterator(LEGlyphStorage &theGlyphStorage, GlyphPositionAdjustments *theGlyphPositionAdjustments, le_bool rightToLeft, le_uint16 theLookupFlags,
                             FeatureMask theFeatureMask, const LEReferenceTo<GlyphDefinitionTableHeader> &theGlyphDefinitionTableHeader)
  : direction(1), position(-1), nextLimit(-1), prevLimit(-1),
    glyphStorage(theGlyphStorage), glyphPositionAdjustments(theGlyphPositionAdjustments),
    srcIndex(-1), destIndex(-1), lookupFlags(theLookupFlags), featureMask(theFeatureMask), glyphGroup(0),
    glyphClassDefinitionTable(), markAttachClassDefinitionTable()

{
  LEErrorCode success = LE_NO_ERROR; // TODO
    le_int32 glyphCount = glyphStorage.getGlyphCount();

    if (theGlyphDefinitionTableHeader.isValid()) {
      glyphClassDefinitionTable = theGlyphDefinitionTableHeader
        -> getGlyphClassDefinitionTable(theGlyphDefinitionTableHeader, success);
      markAttachClassDefinitionTable = theGlyphDefinitionTableHeader
        ->getMarkAttachClassDefinitionTable(theGlyphDefinitionTableHeader, success);
    }

    nextLimit = glyphCount;

    if (rightToLeft) {
        direction = -1;
        position = glyphCount;
        nextLimit = -1;
        prevLimit = glyphCount;
    }
    filterResetCache();
}

le_bool GlyphLookupTableHeader::coversScriptAndLanguage(const LETableReference &base, LETag scriptTag, LETag languageTag, LEErrorCode &success, le_bool exactMatch) const
{
  LEReferenceTo<ScriptListTable> scriptListTable(base, success, SWAPW(scriptListOffset));
  LEReferenceTo<LangSysTable> langSysTable = scriptListTable->findLanguage(scriptListTable,
                                    scriptTag, languageTag, success, exactMatch);

    // FIXME: could check featureListOffset, lookupListOffset, and lookup count...
    // Note: don't have to SWAPW langSysTable->featureCount to check for non-zero.
  return LE_SUCCESS(success)&&langSysTable.isValid() && langSysTable->featureCount != 0;
}

le_int32 LookupProcessor::process(LEGlyphStorage &glyphStorage, GlyphPositionAdjustments *glyphPositionAdjustments,
                                  le_bool rightToLeft, const LEReferenceTo<GlyphDefinitionTableHeader> &glyphDefinitionTableHeader,
                              const LEFontInstance *fontInstance, LEErrorCode& success) const
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    le_int32 glyphCount = glyphStorage.getGlyphCount();

    if (lookupSelectArray == NULL) {
        return glyphCount;
    }

    GlyphIterator glyphIterator(glyphStorage, glyphPositionAdjustments,
                                rightToLeft, 0, 0, glyphDefinitionTableHeader, success);
    le_int32 newGlyphCount = glyphCount;

    for (le_uint16 order = 0; order < lookupOrderCount && LE_SUCCESS(success); order += 1) {
        le_uint16 lookup = lookupOrderArray[order];
        FeatureMask selectMask = lookupSelectArray[lookup];

        if (selectMask != 0) {
          _LETRACE("Processing order#%d/%d", order, lookupOrderCount);
          const LEReferenceTo<LookupTable> lookupTable = lookupListTable->getLookupTable(lookupListTable, lookup, success);
          if (!lookupTable.isValid() ||LE_FAILURE(success) ) {
                continue;
            }
            le_uint16 lookupFlags = SWAPW(lookupTable->lookupFlags);

            glyphIterator.reset(lookupFlags, selectMask);

            while (glyphIterator.findFeatureTag()) {
                applyLookupTable(lookupTable, &glyphIterator, fontInstance, success);
                if (LE_FAILURE(success)) {
#if LE_TRACE
                    _LETRACE("Failure for lookup 0x%x - %s\n", lookup, u_errorName((UErrorCode)success));
#endif
                    return 0;
                }
            }

            newGlyphCount = glyphIterator.applyInsertions();
        }
    }

    return newGlyphCount;
}

le_uint32 LookupProcessor::applySingleLookup(le_uint16 lookupTableIndex, GlyphIterator *glyphIterator,
                                          const LEFontInstance *fontInstance, LEErrorCode& success) const
{
    if (LE_FAILURE(success)) {
        return 0;
    }

    const LEReferenceTo<LookupTable> lookupTable = lookupListTable->getLookupTable(lookupListTable, lookupTableIndex, success);
    if (!lookupTable.isValid()) {
        success = LE_INTERNAL_ERROR;
        return 0;
    }
    le_uint16 lookupFlags = SWAPW(lookupTable->lookupFlags);
    GlyphIterator tempIterator(*glyphIterator, lookupFlags);
    le_uint32 delta = applyLookupTable(lookupTable, &tempIterator, fontInstance, success);

    return delta;
}

le_int32 LookupProcessor::selectLookups(const LEReferenceTo<FeatureTable> &featureTable, FeatureMask featureMask, le_int32 order, LEErrorCode &success)
{
  le_uint16 lookupCount = featureTable.isValid()? SWAPW(featureTable->lookupCount) : 0;
    le_int32  store = order;
    
    LEReferenceToArrayOf<le_uint16> lookupListIndexArray(featureTable, success, featureTable->lookupListIndexArray, lookupCount);

    for (le_uint16 lookup = 0; LE_SUCCESS(success) && lookup < lookupCount; lookup += 1) {
      le_uint16 lookupListIndex = SWAPW(lookupListIndexArray.getObject(lookup,success));
      if (lookupListIndex >= lookupSelectCount) {
        continue;
      }
      
      lookupSelectArray[lookupListIndex] |= featureMask;
      lookupOrderArray[store++] = lookupListIndex;
    }

    return store - order;
}

LookupProcessor::LookupProcessor(const LETableReference &baseAddress,
        Offset scriptListOffset, Offset featureListOffset, Offset lookupListOffset,
        LETag scriptTag, LETag languageTag, const FeatureMap *featureMap, le_int32 featureMapCount, le_bool orderFeatures,
        LEErrorCode& success)
    : lookupListTable(), featureListTable(), lookupSelectArray(NULL), lookupSelectCount(0),
      lookupOrderArray(NULL), lookupOrderCount(0), fReference(baseAddress)
{
  LEReferenceTo<ScriptListTable> scriptListTable;
  LEReferenceTo<LangSysTable> langSysTable;
    le_uint16 featureCount = 0;
    le_uint16 lookupListCount = 0;
    le_uint16 requiredFeatureIndex = 0xFFFF;

    if (LE_FAILURE(success)) {
        return;
    }

    if (scriptListOffset != 0) {
      scriptListTable = LEReferenceTo<ScriptListTable>(baseAddress, success, scriptListOffset);
      langSysTable = scriptListTable->findLanguage(scriptListTable, scriptTag, languageTag, success);

      if (langSysTable.isValid() && LE_SUCCESS(success)) {
        featureCount = SWAPW(langSysTable->featureCount);
      }
    }

    if (featureListOffset != 0) {
      featureListTable = LEReferenceTo<FeatureListTable>(baseAddress, success, featureListOffset);
    }

    if (lookupListOffset != 0) {
      lookupListTable = LEReferenceTo<LookupListTable>(baseAddress,success, lookupListOffset);
      if(LE_SUCCESS(success) && lookupListTable.isValid()) {
        lookupListCount = SWAPW(lookupListTable->lookupCount);
      }
    }

    if (langSysTable.isEmpty() || featureListTable.isEmpty() || lookupListTable.isEmpty() ||
        featureCount == 0 || lookupListCount == 0) {
        return;
    }

    if(langSysTable.isValid()) {
      requiredFeatureIndex = SWAPW(langSysTable->reqFeatureIndex);
    }

    lookupSelectArray = LE_NEW_ARRAY(FeatureMask, lookupListCount);
    if (lookupSelectArray == NULL) {
        success = LE_MEMORY_ALLOCATION_ERROR;
        return;
    }

    for (int i = 0; i < lookupListCount; i += 1) {
        lookupSelectArray[i] = 0;
    }

    lookupSelectCount = lookupListCount;

    le_int32 count, order = 0;
    le_uint32 featureReferences = 0;
    LEReferenceTo<FeatureTable> featureTable;
    LETag featureTag;

    LEReferenceTo<FeatureTable> requiredFeatureTable;
    LETag requiredFeatureTag = 0x00000000U;

    // Count the total number of lookups referenced by all features. This will
    // be the maximum number of entries in the lookupOrderArray. We can't use
    // lookupListCount because some lookups might be referenced by more than
    // one feature.
    if(featureListTable.isValid() && LE_SUCCESS(success)) {
      LEReferenceToArrayOf<le_uint16> featureIndexArray(langSysTable, success, langSysTable->featureIndexArray, featureCount);

      for (le_uint32 feature = 0; LE_SUCCESS(success)&&(feature < featureCount); feature += 1) {
        le_uint16 featureIndex = SWAPW(featureIndexArray.getObject(feature, success));

        featureTable = featureListTable->getFeatureTable(featureListTable, featureIndex,  &featureTag, success);
        if (!featureTable.isValid() || LE_FAILURE(success)) {
          continue;
        }
        featureReferences += SWAPW(featureTable->lookupCount);
      }
    }

    if (!featureTable.isValid() || LE_FAILURE(success)) {
        success = LE_INTERNAL_ERROR;
        return;
    }

    if (requiredFeatureIndex != 0xFFFF) {
      requiredFeatureTable = featureListTable->getFeatureTable(featureListTable, requiredFeatureIndex, &requiredFeatureTag, success);
      if (LE_FAILURE(success)) return;
      featureReferences += SWAPW(requiredFeatureTable->lookupCount);
    }

    lookupOrderArray = LE_NEW_ARRAY(le_uint16, featureReferences);
    if (lookupOrderArray == NULL) {
        success = LE_MEMORY_ALLOCATION_ERROR;
        return;
    }
//.........这里部分代码省略.........