org.mycore.tools.MCRPNGTools Maven / Gradle / Ivy
/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MyCoRe 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with MyCoRe. If not, see .
*/
package org.mycore.tools;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.mycore.common.content.MCRByteContent;
import org.mycore.common.content.MCRContent;
import org.mycore.common.content.streams.MCRByteArrayOutputStream;
public class MCRPNGTools implements AutoCloseable {
private static Logger LOGGER = LogManager.getLogger(MCRPNGTools.class);
private static AtomicInteger maxPngSize = new AtomicInteger(64 * 1024);
private ImageWriteParam imageWriteParam;
private ConcurrentLinkedQueue imageWriters = new ConcurrentLinkedQueue<>();
public MCRPNGTools() {
imageWriteParam = ImageIO.getImageWritersBySuffix("png").next().getDefaultWriteParam();
try {
imageWriteParam.setProgressiveMode(ImageWriteParam.MODE_DEFAULT);
} catch (UnsupportedOperationException e) {
LOGGER.warn("Your PNG encoder does not support progressive PNGs.");
}
}
public MCRContent toPNGContent(BufferedImage thumbnail) throws IOException {
if (thumbnail != null) {
ImageWriter imageWriter = getImageWriter();
try (MCRByteArrayOutputStream bout = new MCRByteArrayOutputStream(maxPngSize.get());
ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(bout)) {
imageWriter.setOutput(imageOutputStream);
IIOImage iioImage = new IIOImage(thumbnail, null, null);
imageWriter.write(null, iioImage, imageWriteParam);
int contentLength = bout.size();
maxPngSize.set(Math.max(maxPngSize.get(), contentLength));
MCRByteContent imageContent = new MCRByteContent(bout.getBuffer(), 0, bout.size());
imageContent.setMimeType("image/png");
return imageContent;
} finally {
imageWriter.reset();
imageWriters.add(imageWriter);
}
} else {
return null;
}
}
private ImageWriter getImageWriter() {
ImageWriter imageWriter = imageWriters.poll();
if (imageWriter == null) {
imageWriter = ImageIO.getImageWritersBySuffix("png").next();
}
return imageWriter;
}
@Override
public void close() throws Exception {
for (ImageWriter imageWriter : imageWriters) {
imageWriter.dispose();
}
}
}