source/layout/SubstitutionLookups.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
   4  *
   5  */
   6
   7 #include "LETypes.h"
   8 #include "LEFontInstance.h"
   9 #include "OpenTypeTables.h"
  10 #include "GlyphSubstitutionTables.h"
  11 #include "GlyphIterator.h"
  12 #include "LookupProcessor.h"
  13 #include "SubstitutionLookups.h"
  14 #include "CoverageTables.h"
  15 #include "LESwaps.h"
  16
  17 U_NAMESPACE_BEGIN
  18
  19 /*
  20     NOTE: This could be optimized somewhat by keeping track
  21     of the previous sequenceIndex in the loop and doing next()
  22     or prev() of the delta between that and the current
  23     sequenceIndex instead of always resetting to the front.
  24 */
  25 void SubstitutionLookup::applySubstitutionLookups(
  26         LookupProcessor *lookupProcessor,
  27         SubstitutionLookupRecord *substLookupRecordArray,
  28         le_uint16 substCount,
  29         GlyphIterator *glyphIterator,
  30         const LEFontInstance *fontInstance,
  31         le_int32 position,
  32         LEErrorCode& success)
  33 {
  34     if (LE_FAILURE(success)) {
  35         return;
  36     }
  37
  38     GlyphIterator tempIterator(*glyphIterator);
  39
  40     for (le_uint16 subst = 0; subst < substCount && LE_SUCCESS(success); subst += 1) {
  41         le_uint16 sequenceIndex = SWAPW(substLookupRecordArray[subst].sequenceIndex);
  42         le_uint16 lookupListIndex = SWAPW(substLookupRecordArray[subst].lookupListIndex);
  43
  44         tempIterator.setCurrStreamPosition(position);
  45         tempIterator.next(sequenceIndex);
  46
  47         lookupProcessor->applySingleLookup(lookupListIndex, &tempIterator, fontInstance, success);
  48     }
  49 }
  50
  51 U_NAMESPACE_END