sl@0: /*
sl@0:  * HanLayoutEngine.cpp: OpenType processing for Han fonts.
sl@0:  *
sl@0:  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved.
sl@0:  */
sl@0: 
sl@0: #include "LETypes.h"
sl@0: #include "LEScripts.h"
sl@0: #include "LELanguages.h"
sl@0: 
sl@0: #include "LayoutEngine.h"
sl@0: #include "OpenTypeLayoutEngine.h"
sl@0: #include "HanLayoutEngine.h"
sl@0: #include "ScriptAndLanguageTags.h"
sl@0: #include "LEGlyphStorage.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HanOpenTypeLayoutEngine)
sl@0: 
sl@0: HanOpenTypeLayoutEngine::HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
sl@0:                         le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable)
sl@0:     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable)
sl@0: {
sl@0:     // nothing else to do...
sl@0: }
sl@0: 
sl@0: HanOpenTypeLayoutEngine::~HanOpenTypeLayoutEngine()
sl@0: {
sl@0:     // nothing to do
sl@0: }
sl@0: 
sl@0: static const LETag emptyTag = 0x00000000;
sl@0: 
sl@0: static const LETag loclFeatureTag = LE_LOCL_FEATURE_TAG;
sl@0: static const LETag smplFeatureTag = LE_SMPL_FEATURE_TAG;
sl@0: static const LETag tradFeatureTag = LE_TRAD_FEATURE_TAG;
sl@0: 
sl@0: static const LETag features[] = {loclFeatureTag, emptyTag};
sl@0: 
sl@0: le_int32 HanOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/,
sl@0:         LEUnicode *&/*outChars*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
sl@0: {
sl@0:     if (LE_FAILURE(success)) {
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
sl@0:         success = LE_ILLEGAL_ARGUMENT_ERROR;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     glyphStorage.allocateGlyphArray(count, FALSE, success);
sl@0:     glyphStorage.allocateAuxData(success);
sl@0: 
sl@0:     if (LE_FAILURE(success)) {
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     // FIXME: do we want to add the 'trad' feature for 'ZHT' and the
sl@0:     // 'smpl' feature for 'ZHS'? If we do this, we can remove the exact
sl@0:     // flag from the language tag lookups, so we can use these features
sl@0:     // with the default LangSys...
sl@0:     for (le_int32 i = 0; i < count; i += 1) {
sl@0:         glyphStorage.setAuxData(i, (void *) features, success);
sl@0:     }
sl@0: 
sl@0:     return count;
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END