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Apache XML Graphics Commons is a library that consists of several reusable components used by Apache Batik and Apache FOP. Many of these components can easily be used separately outside the domains of SVG and XSL-FO.

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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.
 */

/* $Id: ImageConverterRendered2PNG.java 1681108 2015-05-22 13:26:12Z ssteiner $ */

package org.apache.xmlgraphics.image.loader.impl;

import java.io.IOException;
import java.util.Map;

import org.apache.commons.io.output.ByteArrayOutputStream;

import org.apache.xmlgraphics.image.loader.Image;
import org.apache.xmlgraphics.image.loader.ImageException;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.writer.ImageWriter;
import org.apache.xmlgraphics.image.writer.ImageWriterParams;
import org.apache.xmlgraphics.image.writer.ImageWriterRegistry;
import org.apache.xmlgraphics.util.MimeConstants;

/**
 * This ImageConverter converts Rendered to PNG images.
 */
public class ImageConverterRendered2PNG extends AbstractImageConverter {

    /** {@inheritDoc} */
    public Image convert(Image src, Map hints) throws ImageException, IOException {
        checkSourceFlavor(src);
        assert src instanceof ImageRendered;
        ImageRendered rendered = (ImageRendered)src;
        ImageWriter writer = ImageWriterRegistry.getInstance().getWriterFor(MimeConstants.MIME_PNG);
        if (writer == null) {
            throw new ImageException("Cannot convert image to PNG. No suitable ImageWriter found.");
        }
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        ImageWriterParams params = new ImageWriterParams();
        params.setResolution((int)Math.round(src.getSize().getDpiHorizontal()));
        writer.writeImage(rendered.getRenderedImage(), baout, params);
        return new ImageRawStream(src.getInfo(), getTargetFlavor(),
                new java.io.ByteArrayInputStream(baout.toByteArray()));
    }

    /** {@inheritDoc} */
    public ImageFlavor getSourceFlavor() {
        return ImageFlavor.RENDERED_IMAGE;
    }

    /** {@inheritDoc} */
    public ImageFlavor getTargetFlavor() {
        return ImageFlavor.RAW_PNG;
    }

}