sl@0: 
sl@0: /*
sl@0:  *
sl@0:  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved 
sl@0:  *
sl@0:  * This file is a modification of the ICU file IndicLayoutEngine.cpp
sl@0:  * by Jens Herden and Javier Sola for Khmer language 
sl@0:  *
sl@0:  */
sl@0: 
sl@0: 
sl@0: #include "OpenTypeLayoutEngine.h"
sl@0: #include "KhmerLayoutEngine.h"
sl@0: #include "LEGlyphStorage.h"
sl@0: #include "KhmerReordering.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: UOBJECT_DEFINE_RTTI_IMPLEMENTATION(KhmerOpenTypeLayoutEngine)
sl@0: 
sl@0: KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(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:     fFeatureOrder = KhmerReordering::getFeatureOrder();
sl@0: }
sl@0: 
sl@0: KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
sl@0: 						     le_int32 typoFlags)
sl@0:     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)
sl@0: {
sl@0:     fFeatureOrder = KhmerReordering::getFeatureOrder();
sl@0: }
sl@0: 
sl@0: KhmerOpenTypeLayoutEngine::~KhmerOpenTypeLayoutEngine()
sl@0: {
sl@0:     // nothing to do
sl@0: }
sl@0: 
sl@0: // Input: characters
sl@0: // Output: characters, char indices, tags
sl@0: // Returns: output character count
sl@0: le_int32 KhmerOpenTypeLayoutEngine::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:     le_int32 worstCase = count * 3;  // worst case is 3 for Khmer  TODO check if 2 is enough
sl@0: 
sl@0:     outChars = LE_NEW_ARRAY(LEUnicode, worstCase);
sl@0: 
sl@0:     if (outChars == NULL) {
sl@0:         success = LE_MEMORY_ALLOCATION_ERROR;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);
sl@0:     glyphStorage.allocateAuxData(success);
sl@0: 
sl@0:     if (LE_FAILURE(success)) {
sl@0:         LE_DELETE_ARRAY(outChars);
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     // NOTE: assumes this allocates featureTags...
sl@0:     // (probably better than doing the worst case stuff here...)
sl@0:     le_int32 outCharCount = KhmerReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage);
sl@0: 
sl@0:     glyphStorage.adoptGlyphCount(outCharCount);
sl@0:     return outCharCount;
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END