1 /*
   2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.  Oracle designates this
   7  * particular file as subject to the "Classpath" exception as provided
   8  * by Oracle in the LICENSE file that accompanied this code.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 /*
  27  *
  28  * (C) Copyright IBM Corp. 1998 - 2004 - All Rights Reserved
  29  *
  30  */
  31 
  32 
  33 #include "LETypes.h"
  34 #include "LayoutTables.h"
  35 #include "MorphTables.h"
  36 #include "SubtableProcessor.h"
  37 #include "IndicRearrangementProcessor.h"
  38 #include "ContextualGlyphSubstProc.h"
  39 #include "LigatureSubstProc.h"
  40 #include "NonContextualGlyphSubstProc.h"
  41 //#include "ContextualGlyphInsertionProcessor.h"
  42 #include "LEGlyphStorage.h"
  43 #include "LESwaps.h"
  44 
  45 void MorphTableHeader::process(LEGlyphStorage &glyphStorage) const
  46 {
  47     const ChainHeader *chainHeader = chains;
  48     le_uint32 chainCount = SWAPL(this->nChains);
  49     le_uint32 chain;
  50 
  51     for (chain = 0; chain < chainCount; chain += 1) {
  52         FeatureFlags defaultFlags = SWAPL(chainHeader->defaultFlags);
  53         le_uint32 chainLength = SWAPL(chainHeader->chainLength);
  54         le_int16 nFeatureEntries = SWAPW(chainHeader->nFeatureEntries);
  55         le_int16 nSubtables = SWAPW(chainHeader->nSubtables);
  56         const MorphSubtableHeader *subtableHeader =
  57             (const MorphSubtableHeader *)&chainHeader->featureTable[nFeatureEntries];
  58         le_int16 subtable;
  59 
  60         for (subtable = 0; subtable < nSubtables; subtable += 1) {
  61             le_int16 length = SWAPW(subtableHeader->length);
  62             SubtableCoverage coverage = SWAPW(subtableHeader->coverage);
  63             FeatureFlags subtableFeatures = SWAPL(subtableHeader->subtableFeatures);
  64 
  65             // should check coverage more carefully...
  66             if ((coverage & scfVertical) == 0 && (subtableFeatures & defaultFlags) != 0) {
  67                 subtableHeader->process(glyphStorage);
  68             }
  69 
  70             subtableHeader = (const MorphSubtableHeader *) ((char *)subtableHeader + length);
  71         }
  72 
  73         chainHeader = (const ChainHeader *)((char *)chainHeader + chainLength);
  74     }
  75 }
  76 
  77 void MorphSubtableHeader::process(LEGlyphStorage &glyphStorage) const
  78 {
  79     SubtableProcessor *processor = NULL;
  80 
  81     switch (SWAPW(coverage) & scfTypeMask)
  82     {
  83     case mstIndicRearrangement:
  84         processor = new IndicRearrangementProcessor(this);
  85         break;
  86 
  87     case mstContextualGlyphSubstitution:
  88         processor = new ContextualGlyphSubstitutionProcessor(this);
  89         break;
  90 
  91     case mstLigatureSubstitution:
  92         processor = new LigatureSubstitutionProcessor(this);
  93         break;
  94 
  95     case mstReservedUnused:
  96         break;
  97 
  98     case mstNonContextualGlyphSubstitution:
  99         processor = NonContextualGlyphSubstitutionProcessor::createInstance(this);
 100         break;
 101 
 102     /*
 103     case mstContextualGlyphInsertion:
 104         processor = new ContextualGlyphInsertionProcessor(this);
 105         break;
 106     */
 107 
 108     default:
 109         break;
 110     }
 111 
 112     if (processor != NULL) {
 113         processor->process(glyphStorage);
 114         delete processor;
 115     }
 116 }