pdfbox-trunk/fontbox/src/test/java/org/apache/fontbox/ttf/GSUBTableDebugger.java
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.fontbox.ttf;

import static org.junit.jupiter.api.Assertions.fail;

import java.io.IOException;

import org.apache.fontbox.ttf.gsub.GSUBTablePrintUtil;
import org.apache.fontbox.ttf.model.GsubData;
import org.apache.pdfbox.io.RandomAccessReadBuffer;
import org.junit.jupiter.api.Test;

/**
 * This class is to be used mainly for debugging purposes. Prints the GSUB Feature table for debugging.
 * 
 * @author Palash Ray
 */
public class GSUBTableDebugger
{

    private static final String LOHIT_BENGALI_FONT_FILE = "/ttf/Lohit-Bengali.ttf";

    @Test
    void printLohitBengaliTTF()
    {
        try
        {
            RandomAccessReadBuffer randomAccessReadBuffer = new RandomAccessReadBuffer(
                    GSUBTableDebugger.class.getResourceAsStream(LOHIT_BENGALI_FONT_FILE));
            RandomAccessReadDataStream randomAccessReadBufferDataStream = new RandomAccessReadDataStream(
                    randomAccessReadBuffer);
    
            randomAccessReadBufferDataStream.seek(GlyphSubstitutionTableTest.DATA_POSITION_FOR_GSUB_TABLE);
    
            GlyphSubstitutionTable glyphSubstitutionTable = new GlyphSubstitutionTable();
    
            glyphSubstitutionTable.read(null, randomAccessReadBufferDataStream);
    
            TrueTypeFont trueTypeFont = new TTFParser()
                    .parse(new RandomAccessReadBuffer(
                            GSUBTableDebugger.class.getResourceAsStream(LOHIT_BENGALI_FONT_FILE)));
    
            GsubData gsubData = glyphSubstitutionTable.getGsubData();
            new GSUBTablePrintUtil().printCharacterToGlyph(gsubData,
                    trueTypeFont.getUnicodeCmapLookup());
        }
        catch (IOException exception)
        {
            fail(exception);
        }
    }

}
