icuSources/layout/ContextualGlyphInsertionProc2.cpp

   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 "ContextualGlyphInsertionProc2.h"
  14 #include "LEGlyphStorage.h"
  15 #include "LESwaps.h"
  16
  17 U_NAMESPACE_BEGIN
  18
  19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphInsertionProcessor2)
  20
  21 ContextualGlyphInsertionProcessor2::ContextualGlyphInsertionProcessor2(
  22          const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)
  23   : StateTableProcessor2(morphSubtableHeader, success)
  24 {
  25   contextualGlyphHeader = LEReferenceTo<ContextualGlyphInsertionHeader2>(morphSubtableHeader, success);
  26   if(LE_FAILURE(success) || !contextualGlyphHeader.isValid()) return;
  27   le_uint32 insertionTableOffset = SWAPL(contextualGlyphHeader->insertionTableOffset);
  28   insertionTable = LEReferenceToArrayOf<le_uint16>(stHeader, success, insertionTableOffset, LE_UNBOUNDED_ARRAY);
  29   entryTable = LEReferenceToArrayOf<ContextualGlyphInsertionStateEntry2>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);
  30 }
  31
  32 ContextualGlyphInsertionProcessor2::~ContextualGlyphInsertionProcessor2()
  33 {
  34 }
  35
  36 void ContextualGlyphInsertionProcessor2::beginStateTable()
  37 {
  38     markGlyph = 0;
  39 }
  40
  41 void ContextualGlyphInsertionProcessor2::doInsertion(LEGlyphStorage &glyphStorage,
  42                                                      le_int16 atGlyph,
  43                                                      le_int16 &index,
  44                                                      le_int16 count,
  45                                                      le_bool /* isKashidaLike */,
  46                                                      le_bool isBefore,
  47                                                      LEErrorCode &success) {
  48   LEGlyphID *insertGlyphs = glyphStorage.insertGlyphs(atGlyph, count + 1, success);
  49
  50   if(LE_FAILURE(success) || insertGlyphs==NULL) {
  51     return;
  52   }
  53
  54   // Note: Kashida vs Split Vowel seems to only affect selection and highlighting.
  55   // We note the flag, but do not layout different.
  56   // https://developer.apple.com/fonts/TTRefMan/RM06/Chap6mort.html
  57
  58   le_int16 targetIndex = 0;
  59   if(isBefore) {
  60     // insert at beginning
  61     insertGlyphs[targetIndex++] = glyphStorage[atGlyph];
  62   } else {
  63     // insert at end
  64     insertGlyphs[count] = glyphStorage[atGlyph];
  65   }
  66
  67   while(count--) {
  68     insertGlyphs[targetIndex++] = insertionTable.getObject(index++, success);
  69   }
  70   glyphStorage.applyInsertions();
  71 }
  72
  73 le_uint16 ContextualGlyphInsertionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph,
  74                                                                 EntryTableIndex2 index, LEErrorCode &success)
  75 {
  76     const ContextualGlyphInsertionStateEntry2 *entry = entryTable.getAlias(index, success);
  77
  78     if(LE_FAILURE(success)) return 0; // TODO- which state?
  79
  80     le_uint16 newState = SWAPW(entry->newStateIndex);
  81     le_uint16 flags = SWAPW(entry->flags);
  82
  83     le_int16 markIndex = SWAPW(entry->markedInsertionListIndex);
  84     if (markIndex > 0) {
  85         le_int16 count = (flags & cgiMarkedInsertCountMask) >> 5;
  86         le_bool isKashidaLike = (flags & cgiMarkedIsKashidaLike);
  87         le_bool isBefore = (flags & cgiMarkInsertBefore);
  88         doInsertion(glyphStorage, markGlyph, markIndex, count, isKashidaLike, isBefore, success);
  89     }
  90
  91     le_int16 currIndex = SWAPW(entry->currentInsertionListIndex);
  92     if (currIndex > 0) {
  93         le_int16 count = flags & cgiCurrentInsertCountMask;
  94         le_bool isKashidaLike = (flags & cgiCurrentIsKashidaLike);
  95         le_bool isBefore = (flags & cgiCurrentInsertBefore);
  96         doInsertion(glyphStorage, currGlyph, currIndex, count, isKashidaLike, isBefore, success);
  97     }
  98
  99     if (flags & cgiSetMark) {
 100         markGlyph = currGlyph;
 101     }
 102
 103     if (!(flags & cgiDontAdvance)) {
 104         currGlyph += dir;
 105     }
 106
 107     return newState;
 108 }
 109
 110 void ContextualGlyphInsertionProcessor2::endStateTable()
 111 {
 112 }
 113
 114 U_NAMESPACE_END