/*
* Copyright (c) 2008 Los Alamos National Security, LLC.
*
* Los Alamos National Laboratory
* Research Library
* Digital Library Research & Prototyping Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
package gov.lanl.adore.djatoka.io.writer;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.Properties;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import gov.lanl.adore.djatoka.io.FormatIOException;
import gov.lanl.adore.djatoka.io.IWriter;
/**
* JPG File Writer. Uses ImageIO to write BufferedImage as JPG
*
* @author Ryan Chute
* @author Kevin S. Clarke <<a href="mailto:ksclarke@gmail.com">ksclarke@gmail.com</a>>
*/
public class JPGWriter implements IWriter {
public static final int DEFAULT_QUALITY_LEVEL = 90;
private int q = DEFAULT_QUALITY_LEVEL;
/**
* Write a BufferedImage instance using implementation to the provided OutputStream.
*
* @param aImage BufferedImage instance to be serialized
* @param aOutStream OutputStream to output the image to
* @throws FormatIOException
*/
@Override
public void write(final BufferedImage aImage, final OutputStream aOutStream) throws FormatIOException {
final Iterator<ImageWriter> iterator = ImageIO.getImageWritersByFormatName("jpeg");
try {
final ImageWriter jpgWriter = iterator.next();
final ImageWriteParam iwp = jpgWriter.getDefaultWriteParam();
iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwp.setCompressionQuality((float) (q / 100.0));
jpgWriter.setOutput(ImageIO.createImageOutputStream(aOutStream));
jpgWriter.write(null, new IIOImage(aImage, null, null), iwp);
jpgWriter.dispose();
} catch (final IOException details) {
throw new FormatIOException(details);
}
}
/**
* Set the Writer Implementations Serialization properties. Only JPGWriter.quality_level is supported in this
* implementation.
*
* @param aProps writer serialization properties
*/
@Override
public void setWriterProperties(final Properties aProps) {
if (aProps.containsKey("JPGWriter.quality_level")) {
q = Integer.parseInt((String) aProps.get("JPGWriter.quality_level"));
}
}
}