69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
/*
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* HanLayoutEngine.cpp: OpenType processing for Han fonts.
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*
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* (C) Copyright IBM Corp. 1998 - 2003 - All Rights Reserved.
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*
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* $Source: /xsrl/Nsvn/icu/icu/source/layout/HanLayoutEngine.cpp,v $ $Date: 2003/05/13 00:44:33 $ $Revision: 1.2 $
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*/
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#include "LETypes.h"
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#include "LEScripts.h"
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#include "LELanguages.h"
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#include "LayoutEngine.h"
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#include "OpenTypeLayoutEngine.h"
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#include "HanLayoutEngine.h"
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#include "ScriptAndLanguageTags.h"
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const char HanOpenTypeLayoutEngine::fgClassID=0;
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HanOpenTypeLayoutEngine::HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
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const GlyphSubstitutionTableHeader *gsubTable)
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: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, gsubTable)
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{
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// nothing else to do...
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}
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HanOpenTypeLayoutEngine::~HanOpenTypeLayoutEngine()
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{
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// nothing to do
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}
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const LETag emptyTag = 0x00000000;
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const LETag loclFeatureTag = LE_MAKE_TAG('l', 'o', 'c', 'l');
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const LETag smplFeatureTag = LE_MAKE_TAG('s', 'm', 'p', 'l');
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const LETag tradFeatureTag = LE_MAKE_TAG('t', 'r', 'a', 'd');
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const LETag features[] = {loclFeatureTag, emptyTag};
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le_int32 HanOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/,
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LEUnicode *&/*outChars*/, le_int32 *&/*charIndices*/, const LETag **&featureTags, 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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featureTags = LE_NEW_ARRAY(const LETag *, count);
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if (featureTags == NULL) {
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success = LE_MEMORY_ALLOCATION_ERROR;
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return 0;
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}
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// FIXME: do we want to add the 'trad' feature for 'ZHT' and the
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// 'smpl' feature for 'ZHS'? If we do this, we can remove the exact
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// flag from the language tag lookups, so we can use these features
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// with the default LangSys...
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for (le_int32 i = 0; i < count; i += 1) {
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featureTags[i] = features;
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}
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return count;
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}
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