icuSources/layout/MPreFixups.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 2002-2008 - All Rights Reserved
   4  *
   5  */
   6
   7 #include "LETypes.h"
   8 #include "LEGlyphStorage.h"
   9 #include "MPreFixups.h"
  10
  11 U_NAMESPACE_BEGIN
  12
  13 struct FixupData
  14 {
  15     le_int32 fBaseIndex;
  16     le_int32 fMPreIndex;
  17 };
  18
  19 MPreFixups::MPreFixups(le_int32 charCount)
  20     : fFixupData(NULL), fFixupCount(0)
  21 {
  22     fFixupData = LE_NEW_ARRAY(FixupData, charCount);
  23 }
  24
  25 MPreFixups::~MPreFixups()
  26 {
  27     LE_DELETE_ARRAY(fFixupData);
  28     fFixupData = NULL;
  29 }
  30
  31 void MPreFixups::add(le_int32 baseIndex, le_int32 mpreIndex)
  32 {
  33     // NOTE: don't add the fixup data if the mpre is right
  34     // before the base consonant glyph.
  35     if (baseIndex - mpreIndex > 1) {
  36         fFixupData[fFixupCount].fBaseIndex = baseIndex;
  37         fFixupData[fFixupCount].fMPreIndex = mpreIndex;
  38
  39         fFixupCount += 1;
  40     }
  41 }
  42
  43 void MPreFixups::apply(LEGlyphStorage &glyphStorage, LEErrorCode& success)
  44 {
  45     if (LE_FAILURE(success)) {
  46         return;
  47     }
  48
  49     for (le_int32 fixup = 0; fixup < fFixupCount; fixup += 1) {
  50         le_int32 baseIndex = fFixupData[fixup].fBaseIndex;
  51         le_int32 mpreIndex = fFixupData[fixup].fMPreIndex;
  52         le_int32 mpreLimit = mpreIndex + 1;
  53
  54         while (glyphStorage[baseIndex] == 0xFFFF || glyphStorage[baseIndex] == 0xFFFE) {
  55             baseIndex -= 1;
  56         }
  57
  58         while (glyphStorage[mpreLimit] == 0xFFFF || glyphStorage[mpreLimit] == 0xFFFE) {
  59             mpreLimit += 1;
  60         }
  61
  62         if (mpreLimit == baseIndex) {
  63             continue;
  64         }
  65
  66         LEErrorCode success = LE_NO_ERROR;
  67         le_int32   mpreCount = mpreLimit - mpreIndex;
  68         le_int32   moveCount = baseIndex - mpreLimit;
  69         le_int32   mpreDest  = baseIndex - mpreCount;
  70         LEGlyphID *mpreSave  = LE_NEW_ARRAY(LEGlyphID, mpreCount);
  71         le_int32  *indexSave = LE_NEW_ARRAY(le_int32, mpreCount);
  72
  73         if (mpreSave == NULL || indexSave == NULL) {
  74             LE_DELETE_ARRAY(mpreSave);
  75             LE_DELETE_ARRAY(indexSave);
  76             success = LE_MEMORY_ALLOCATION_ERROR;
  77             return;
  78         }
  79
  80         le_int32   i;
  81
  82         for (i = 0; i < mpreCount; i += 1) {
  83             mpreSave[i]  = glyphStorage[mpreIndex + i];
  84             indexSave[i] = glyphStorage.getCharIndex(mpreIndex + i, success); //charIndices[mpreIndex + i];
  85         }
  86
  87         for (i = 0; i < moveCount; i += 1) {
  88             LEGlyphID glyph = glyphStorage[mpreLimit + i];
  89             le_int32 charIndex = glyphStorage.getCharIndex(mpreLimit + i, success);
  90
  91             glyphStorage[mpreIndex + i] = glyph;
  92             glyphStorage.setCharIndex(mpreIndex + i, charIndex, success);
  93         }
  94
  95         for (i = 0; i < mpreCount; i += 1) {
  96             glyphStorage[mpreDest + i] = mpreSave[i];
  97             glyphStorage.setCharIndex(mpreDest, indexSave[i], success);
  98         }
  99
 100         LE_DELETE_ARRAY(indexSave);
 101         LE_DELETE_ARRAY(mpreSave);
 102     }
 103 }
 104
 105 U_NAMESPACE_END