icuSources/layout/StateTableProcessor2.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp.  and others 1998-2016 - 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 "LEGlyphStorage.h"
  14 #include "LESwaps.h"
  15 #include "LookupTables.h"
  16
  17 U_NAMESPACE_BEGIN
  18
  19 StateTableProcessor2::StateTableProcessor2()
  20 {
  21 }
  22
  23 StateTableProcessor2::StateTableProcessor2(const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)
  24   : SubtableProcessor2(morphSubtableHeader, success),
  25     dir(1),
  26     format(0),
  27     nClasses(0),
  28     classTableOffset(0),
  29     stateArrayOffset(0),
  30     entryTableOffset(0),
  31     classTable(),
  32     stateArray(),
  33     stateTableHeader(morphSubtableHeader, success),
  34     stHeader(stateTableHeader, success, (const StateTableHeader2*)&stateTableHeader->stHeader)
  35 {
  36   if (LE_FAILURE(success)) {
  37     return;
  38   }
  39   nClasses = SWAPL(stHeader->nClasses);
  40   classTableOffset = SWAPL(stHeader->classTableOffset);
  41   stateArrayOffset = SWAPL(stHeader->stateArrayOffset);
  42   entryTableOffset = SWAPL(stHeader->entryTableOffset);
  43
  44   classTable = LEReferenceTo<LookupTableBase>(stHeader, success, classTableOffset);
  45   format = SWAPW(classTable->format);
  46
  47   stateArray = LEReferenceToArrayOf<EntryTableIndex2>(stHeader, success, stateArrayOffset, LE_UNBOUNDED_ARRAY);
  48 }
  49
  50 StateTableProcessor2::~StateTableProcessor2()
  51 {
  52 }
  53
  54 void StateTableProcessor2::process(LEGlyphStorage &glyphStorage, LEErrorCode &success)
  55 {
  56     if (LE_FAILURE(success)) return;
  57     // Start at state 0
  58     // XXX: How do we know when to start at state 1?
  59     le_uint16 currentState = 0;
  60     le_int32 glyphCount = glyphStorage.getGlyphCount();
  61
  62     LE_STATE_PATIENCE_INIT();
  63
  64     le_int32 currGlyph = 0;
  65     if ((coverage & scfReverse2) != 0) {  // process glyphs in descending order
  66         currGlyph = glyphCount - 1;
  67         dir = -1;
  68     } else {
  69         dir = 1;
  70     }
  71
  72     beginStateTable();
  73     switch (format) {
  74         case ltfSimpleArray: {
  75 #ifdef TEST_FORMAT
  76           LEReferenceTo<SimpleArrayLookupTable> lookupTable0(classTable, success);
  77           if(LE_FAILURE(success)) break;
  78             while ((dir == 1 && currGlyph <= glyphCount) || (dir == -1 && currGlyph >= -1)) {
  79                 if (LE_FAILURE(success)) break;
  80                 if (LE_STATE_PATIENCE_DECR()) {
  81                   LE_DEBUG_BAD_FONT("patience exceeded - state table not moving")
  82                   break; // patience exceeded.
  83                 }
  84                 LookupValue classCode = classCodeOOB;
  85                 if (currGlyph == glyphCount || currGlyph == -1) {
  86                     // XXX: How do we handle EOT vs. EOL?
  87                     classCode = classCodeEOT;
  88                 } else {
  89                     LEGlyphID gid = glyphStorage[currGlyph];
  90                     TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);
  91
  92                     if (glyphCode == 0xFFFF) {
  93                         classCode = classCodeDEL;
  94                     } else {
  95                         classCode = SWAPW(lookupTable0->valueArray[gid]);
  96                     }
  97                 }
  98                 EntryTableIndex2 entryTableIndex = SWAPW(stateArray(classCode + currentState * nClasses, success));
  99                 LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
 100                 currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex); // return a zero-based index instead of a byte offset
 101                 LE_STATE_PATIENCE_INCR(currGlyph);
 102             }
 103 #endif
 104             break;
 105         }
 106         case ltfSegmentSingle: {
 107           LEReferenceTo<SegmentSingleLookupTable> lookupTable2(classTable, success);
 108           if(LE_FAILURE(success)) break;
 109             while ((dir == 1 && currGlyph <= glyphCount) || (dir == -1 && currGlyph >= -1)) {
 110                 if (LE_FAILURE(success)) break;
 111                 if (LE_STATE_PATIENCE_DECR()) {
 112                   LE_DEBUG_BAD_FONT("patience exceeded  - state table not moving")
 113                   break; // patience exceeded.
 114                 }
 115                 LookupValue classCode = classCodeOOB;
 116                 if (currGlyph == glyphCount || currGlyph == -1) {
 117                     // XXX: How do we handle EOT vs. EOL?
 118                     classCode = classCodeEOT;
 119                 } else {
 120                     LEGlyphID gid = glyphStorage[currGlyph];
 121                     TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);
 122
 123                     if (glyphCode == 0xFFFF) {
 124                         classCode = classCodeDEL;
 125                     } else {
 126                       const LookupSegment *segment =
 127                         lookupTable2->lookupSegment(lookupTable2, lookupTable2->segments, gid, success);
 128                         if (segment != NULL && LE_SUCCESS(success)) {
 129                             classCode = SWAPW(segment->value);
 130                         }
 131                     }
 132                 }
 133                 EntryTableIndex2 entryTableIndex = SWAPW(stateArray(classCode + currentState * nClasses,success));
 134                 LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
 135                 currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex, success);
 136                 LE_STATE_PATIENCE_INCR(currGlyph);
 137             }
 138             break;
 139         }
 140         case ltfSegmentArray: {
 141           //printf("Lookup Table Format4: specific interpretation needed!\n");
 142             break;
 143         }
 144         case ltfSingleTable: {
 145             LEReferenceTo<SingleTableLookupTable> lookupTable6(classTable, success);
 146             while ((dir == 1 && currGlyph <= glyphCount) || (dir == -1 && currGlyph >= -1)) {
 147                 if (LE_FAILURE(success)) break;
 148                 if (LE_STATE_PATIENCE_DECR()) {
 149                   LE_DEBUG_BAD_FONT("patience exceeded - state table not moving")
 150                   break; // patience exceeded.
 151                 }
 152                 LookupValue classCode = classCodeOOB;
 153                 if (currGlyph == glyphCount || currGlyph == -1) {
 154                     // XXX: How do we handle EOT vs. EOL?
 155                     classCode = classCodeEOT;
 156                 } else if(currGlyph > glyphCount) {
 157                   // note if > glyphCount, we've run off the end (bad font)
 158                   currGlyph = glyphCount;
 159                   classCode = classCodeEOT;
 160                 } else {
 161                     LEGlyphID gid = glyphStorage[currGlyph];
 162                     TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);
 163
 164                     if (glyphCode == 0xFFFF) {
 165                         classCode = classCodeDEL;
 166                     } else {
 167                       const LookupSingle *segment = lookupTable6->lookupSingle(lookupTable6, lookupTable6->entries, gid, success);
 168                         if (segment != NULL) {
 169                             classCode = SWAPW(segment->value);
 170                         }
 171                     }
 172                 }
 173                 EntryTableIndex2 entryTableIndex = SWAPW(stateArray(classCode + currentState * nClasses, success));
 174                 LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
 175                 currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex, success);
 176                 LE_STATE_PATIENCE_INCR(currGlyph);
 177             }
 178             break;
 179         }
 180         case ltfTrimmedArray: {
 181             LEReferenceTo<TrimmedArrayLookupTable> lookupTable8(classTable, success);
 182             if (LE_FAILURE(success)) break;
 183             TTGlyphID firstGlyph = SWAPW(lookupTable8->firstGlyph);
 184             TTGlyphID lastGlyph  = firstGlyph + SWAPW(lookupTable8->glyphCount);
 185
 186             while ((dir == 1 && currGlyph <= glyphCount) || (dir == -1 && currGlyph >= -1)) {
 187                 if(LE_STATE_PATIENCE_DECR()) {
 188                   LE_DEBUG_BAD_FONT("patience exceeded - state table not moving")
 189                   break; // patience exceeded.
 190                 }
 191
 192                 LookupValue classCode = classCodeOOB;
 193                 if (currGlyph == glyphCount || currGlyph == -1) {
 194                     // XXX: How do we handle EOT vs. EOL?
 195                     classCode = classCodeEOT;
 196                 } else {
 197                     TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(glyphStorage[currGlyph]);
 198                     if (glyphCode == 0xFFFF) {
 199                         classCode = classCodeDEL;
 200                     } else if ((glyphCode >= firstGlyph) && (glyphCode < lastGlyph)) {
 201                         classCode = SWAPW(lookupTable8->valueArray[glyphCode - firstGlyph]);
 202                     }
 203                 }
 204                 EntryTableIndex2 entryTableIndex = SWAPW(stateArray(classCode + currentState * nClasses, success));
 205                 LE_STATE_PATIENCE_CURR(le_int32, currGlyph);
 206                 currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex, success);
 207                 LE_STATE_PATIENCE_INCR(currGlyph);
 208             }
 209             break;
 210         }
 211         default:
 212             break;
 213     }
 214
 215     endStateTable();
 216 }
 217
 218 U_NAMESPACE_END