/*

 * 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