/*

  * HanLayoutEngine.cpp: OpenType processing for Han fonts.

  *

  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved.

  */

 #include "LETypes.h"

 #include "LEScripts.h"

 #include "LELanguages.h"

 #include "LayoutEngine.h"

 #include "OpenTypeLayoutEngine.h"

 #include "HanLayoutEngine.h"

 #include "ScriptAndLanguageTags.h"

 #include "LEGlyphStorage.h"

 U_NAMESPACE_BEGIN

 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HanOpenTypeLayoutEngine)

 HanOpenTypeLayoutEngine::HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,

                         le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable)

     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable)

 {

     // nothing else to do...

 }

 HanOpenTypeLayoutEngine::~HanOpenTypeLayoutEngine()

 {

     // nothing to do

 }

 static const LETag emptyTag = 0x00000000;

 static const LETag loclFeatureTag = LE_LOCL_FEATURE_TAG;

 static const LETag smplFeatureTag = LE_SMPL_FEATURE_TAG;

 static const LETag tradFeatureTag = LE_TRAD_FEATURE_TAG;

 static const LETag features[] = {loclFeatureTag, emptyTag};

 le_int32 HanOpenTypeLayoutEngine::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;

     }

     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {

         success = LE_ILLEGAL_ARGUMENT_ERROR;

         return 0;

     }

     glyphStorage.allocateGlyphArray(count, FALSE, success);

     glyphStorage.allocateAuxData(success);

     if (LE_FAILURE(success)) {

         return 0;

     }

     // FIXME: do we want to add the 'trad' feature for 'ZHT' and the

     // 'smpl' feature for 'ZHS'? If we do this, we can remove the exact

     // flag from the language tag lookups, so we can use these features

     // with the default LangSys...

     for (le_int32 i = 0; i < count; i += 1) {

         glyphStorage.setAuxData(i, (void *) features, success);

     }

     return count;

 }

 U_NAMESPACE_END