text: /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   *
   */
  
  
  /*
   *
   * (C) Copyright IBM Corp. 1998-2009 - All Rights Reserved
   *
   */
  
  #include "LETypes.h"
  #include "LayoutEngine.h"
  #include "OpenTypeLayoutEngine.h"
  #include "IndicLayoutEngine.h"
  #include "ScriptAndLanguageTags.h"
  
  #include "GlyphSubstitutionTables.h"
  #include "GlyphDefinitionTables.h"
  #include "GlyphPositioningTables.h"
  
  #include "GDEFMarkFilter.h"
  #include "LEGlyphStorage.h"
  
  #include "IndicReordering.h"
  
  U_NAMESPACE_BEGIN
  
  UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndicOpenTypeLayoutEngine)
  
  IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
                                                       le_int32 typoFlags, le_bool version2, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success)
      : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success), fMPreFixups(NULL)
  {
    if ( version2 ) {
      fFeatureMap = IndicReordering::getv2FeatureMap(fFeatureMapCount);
    } else {
      fFeatureMap = IndicReordering::getFeatureMap(fFeatureMapCount);
    }
    fFeatureOrder = TRUE;
    fVersion2 = version2;
    fFilterZeroWidth = IndicReordering::getFilterZeroWidth(fScriptCode);
  }
  
  IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success)
      : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success), fMPreFixups(NULL)
  {
      fFeatureMap = IndicReordering::getFeatureMap(fFeatureMapCount);
      fFeatureOrder = TRUE;
      fVersion2 =  FALSE;
  }
  
  IndicOpenTypeLayoutEngine::~IndicOpenTypeLayoutEngine()
  {
      // nothing to do
  }
  
  // Input: characters, tags
  // Output: glyphs, char indices
  le_int32 IndicOpenTypeLayoutEngine::glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
                      LEGlyphStorage &glyphStorage, LEErrorCode &success)
  {
      if (LE_FAILURE(success)) {
          return 0;
      }
  
      if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
          success = LE_ILLEGAL_ARGUMENT_ERROR;
          return 0;
      }
  
      _LETRACE("IOTLE::gp, calling parent");
      le_int32 retCount = OpenTypeLayoutEngine::glyphProcessing(chars, offset, count, max, rightToLeft, glyphStorage, success);
  
      if (LE_FAILURE(success)) {
          return 0;
      }
  
      if (fVersion2) {
        _LETRACE("IOTLE::gp, v2 final,");
        IndicReordering::finalReordering(glyphStorage,retCount);
        _LETRACE("IOTLE::gp, v2 pres");
        IndicReordering::applyPresentationForms(glyphStorage,retCount);
        _LETRACE("IOTLE::gp, parent gsub");
        OpenTypeLayoutEngine::glyphSubstitution(count,max, rightToLeft, glyphStorage, success);
      } else {
        _LETRACE("IOTLE::gp, adjust mpres");
        IndicReordering::adjustMPres(fMPreFixups, glyphStorage, success);
      }
      return retCount;
  }
  
  // Input: characters
  // Output: characters, char indices, tags
  // Returns: output character count
  le_int32 IndicOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
          LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)
  {
      if (LE_FAILURE(success)) {
          return 0;
      }
  
      _LETRACE("IOTLE: charProc");
  
      if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
          success = LE_ILLEGAL_ARGUMENT_ERROR;
          return 0;
      }
  
      le_int32 worstCase = count * IndicReordering::getWorstCaseExpansion(fScriptCode);
  
      outChars = LE_NEW_ARRAY(LEUnicode, worstCase);
  
      if (outChars == NULL) {
          success = LE_MEMORY_ALLOCATION_ERROR;
          return 0;
      }
  
      glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);
      glyphStorage.allocateAuxData(success);
  
      if (LE_FAILURE(success)) {
          LE_DELETE_ARRAY(outChars);
          return 0;
      }
  
      // NOTE: assumes this allocates featureTags...
      // (probably better than doing the worst case stuff here...)
  
      le_int32 outCharCount;
      if (fVersion2) {
          _LETRACE("v2process");
          outCharCount = IndicReordering::v2process(&chars[offset], count, fScriptCode, outChars, glyphStorage);
      } else {
          _LETRACE("reorder");
          outCharCount = IndicReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage, &fMPreFixups, success);
      }
  
      if (LE_FAILURE(success)) {
          LE_DELETE_ARRAY(outChars);
          return 0;
      }
  
      glyphStorage.adoptGlyphCount(outCharCount);
      return outCharCount;
  }
  
  U_NAMESPACE_END
  