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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*
 *  ====================================================================
 *    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.poi.xslf.util;

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.lang.ref.WeakReference;

import javax.imageio.ImageIO;

import org.apache.poi.sl.draw.Drawable;
import org.apache.poi.util.Internal;

@Internal
public class BitmapFormat implements OutputFormat {
    private final String format;
    private BufferedImage img;
    private Graphics2D graphics;

    public BitmapFormat(String format) {
        this.format = format;
    }

    @Override
    public Graphics2D addSlide(double width, double height) {
        int type;
        switch (format) {
            case "png":
            case "gif":
                type = BufferedImage.TYPE_INT_ARGB;
                break;
            default:
                type = BufferedImage.TYPE_INT_RGB;
                break;
        }
        img = new BufferedImage((int)width, (int)height, type);
        graphics = img.createGraphics();
        graphics.setRenderingHint(Drawable.BUFFERED_IMAGE, new WeakReference<>(img));
        return graphics;
    }

    @Override
    public void writeSlide(MFProxy proxy, File outFile) throws IOException {
        if (!"null".equals(format)) {
            ImageIO.write(img, format, outFile);
        }
    }

    @Override
    public void close() throws IOException {
        if (graphics != null) {
            graphics.dispose();
            img.flush();
        }
    }
}