icuSources/layout/CanonShaping.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
   4  *
   5  */
   6
   7 #include "LETypes.h"
   8 #include "LEGlyphStorage.h"
   9 #include "CanonShaping.h"
  10 #include "GlyphDefinitionTables.h"
  11 #include "ClassDefinitionTables.h"
  12
  13 U_NAMESPACE_BEGIN
  14
  15 void CanonShaping::sortMarks(le_int32 *indices, const le_int32 *combiningClasses, le_int32 index, le_int32 limit)
  16 {
  17     for (le_int32 j = index + 1; j < limit; j += 1) {
  18         le_int32 i;
  19         le_int32 v = indices[j];
  20         le_int32 c = combiningClasses[v];
  21
  22         for (i = j - 1; i >= index; i -= 1) {
  23             if (c >= combiningClasses[indices[i]]) {
  24                 break;
  25             }
  26
  27             indices[i + 1] = indices[i];
  28         }
  29
  30         indices[i + 1] = v;
  31     }
  32 }
  33
  34 void CanonShaping::reorderMarks(const LEUnicode *inChars, le_int32 charCount, le_bool rightToLeft,
  35                                 LEUnicode *outChars, LEGlyphStorage &glyphStorage)
  36 {
  37     LEErrorCode success = LE_NO_ERROR;
  38     LEReferenceTo<GlyphDefinitionTableHeader> gdefTable(CanonShaping::glyphDefinitionTable, CanonShaping::glyphDefinitionTableLen);
  39     LEReferenceTo<ClassDefinitionTable> classTable = gdefTable->getMarkAttachClassDefinitionTable(gdefTable, success);
  40     le_int32 *combiningClasses = LE_NEW_ARRAY(le_int32, charCount);
  41     le_int32 *indices = LE_NEW_ARRAY(le_int32, charCount);
  42     le_int32 i;
  43
  44     for (i = 0; i < charCount; i += 1) {
  45       combiningClasses[i] = classTable->getGlyphClass(classTable, (LEGlyphID) inChars[i], success);
  46         indices[i] = i;
  47     }
  48
  49     for (i = 0; i < charCount; i += 1) {
  50         if (combiningClasses[i] != 0) {
  51             le_int32 mark;
  52
  53             for (mark = i; mark < charCount; mark += 1) {
  54                 if (combiningClasses[mark] == 0) {
  55                     break;
  56                 }
  57             }
  58
  59             sortMarks(indices, combiningClasses, i, mark);
  60         }
  61     }
  62
  63     le_int32 out = 0, dir = 1;
  64
  65     if (rightToLeft) {
  66         out = charCount - 1;
  67         dir = -1;
  68     }
  69
  70     for (i = 0; i < charCount; i += 1, out += dir) {
  71         le_int32 index = indices[i];
  72
  73         outChars[i] = inChars[index];
  74         glyphStorage.setCharIndex(out, index, success);
  75     }
  76
  77     LE_DELETE_ARRAY(indices);
  78     LE_DELETE_ARRAY(combiningClasses);
  79 }
  80
  81 U_NAMESPACE_END