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