org.apache.xmlgraphics.image.loader.impl.ImageConverterRendered2PNG Maven / Gradle / Ivy
/*
* 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;
}
}