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Java example source code file (HanLayoutEngine.cpp)

This example Java source code file (HanLayoutEngine.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

false, featuremap, hanopentypelayoutengine, hanopentypelayoutengine\:\:characterprocessing, hanopentypelayoutengine\:\:hanopentypelayoutengine, le_array_size, le_failure, le_locl_feature_tag, leerrorcode, lefontinstance, lereferenceto, leunicode, null, u_namespace_end

The HanLayoutEngine.cpp Java example source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

/*
 * HanLayoutEngine.cpp: OpenType processing for Han fonts.
 *
 * (C) Copyright IBM Corp. 1998-2008 - 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"
#include "OpenTypeTables.h"

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HanOpenTypeLayoutEngine)

#define loclFeatureTag LE_LOCL_FEATURE_TAG
#define smplFeatureTag LE_SMPL_FEATURE_TAG
#define tradFeatureTag LE_TRAD_FEATURE_TAG

#define loclFeatureMask 0x80000000UL
#define smplFeatureMask 0x40000000UL
#define tradFeatureMask 0x20000000UL

static const FeatureMap featureMap[] =
{
    {loclFeatureTag, loclFeatureMask},
    {smplFeatureTag, smplFeatureMask},
    {tradFeatureTag, tradFeatureMask}
};

static const le_int32 featureMapCount = LE_ARRAY_SIZE(featureMap);

#define features (loclFeatureMask)

HanOpenTypeLayoutEngine::HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
                                                 le_int32 typoFlags, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success)
    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success)
{
    fFeatureMap      = featureMap;
    fFeatureMapCount = featureMapCount;
}

HanOpenTypeLayoutEngine::~HanOpenTypeLayoutEngine()
{
    // nothing to do
}

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, features, success);
    }

    return count;
}

U_NAMESPACE_END

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