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/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2009 Pentaho Corporation. All rights reserved.
*/
package org.pentaho.reporting.libraries.base.encoder;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
/**
* Todo: Document Me
*
* @author Thomas Morgner
*/
public class JpegImageEncoder implements ImageEncoder
{
private static final String ENCODER_CLASS = "com.sun.image.codec.jpeg.JPEGCodec";
private static final String ENCODER_PARAM_CLASS = "com.sun.image.codec.jpeg.JPEGEncodeParam";
public JpegImageEncoder()
{
}
public void encodeImage(final Image image,
final OutputStream outputStream,
final float quality,
final boolean encodeAlpha) throws IOException, UnsupportedEncoderException
{
final BufferedImage bimage = new BufferedImage(image.getWidth(null), image.getHeight(null),
BufferedImage.TYPE_INT_RGB);
final Graphics g = bimage.createGraphics();
g.drawImage(image, 0, 0, Color.WHITE, null);
g.dispose();
//// This is what we try to do via reflection. Yes, reflection is ugly, but it guarantees that
//// we dont run into strange errors just because a non-Sun-JDK is used.
//
// final JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(bimage);
// jep.setQuality(quality, false);
// final JPEGImageEncoder jpegImageEncoder = JPEGCodec.createJPEGEncoder(outputStream, jep);
// jpegImageEncoder.encode(bimage);
try
{
final ClassLoader loader = ObjectUtilities.getClassLoader(JpegImageEncoder.class);
final Class codecClass = Class.forName(ENCODER_CLASS, false, loader);
final Class paramClass = Class.forName(ENCODER_PARAM_CLASS, false, loader);
final Method createParameterMethod = codecClass.getMethod
("getDefaultJPEGEncodeParam", new Class[]{BufferedImage.class});
final Object encoderParam = createParameterMethod.invoke(null, new Object[]{bimage});
final Method setQualityMethod = paramClass.getMethod
("setQuality", new Class[]{Float.TYPE, Boolean.TYPE});
setQualityMethod.invoke(encoderParam, new Object[]{new Float(quality), Boolean.FALSE});
final Method createEncoderMethod = codecClass.getMethod
("createJPEGEncoder", new Class[]{OutputStream.class, paramClass});
final Object encoder = createEncoderMethod.invoke(null, new Object[]{outputStream, encoderParam});
final Class encoderClass = encoder.getClass();
final Method encodeMethod = encoderClass.getMethod("encode", new Class[]{BufferedImage.class});
encodeMethod.invoke(encoder, new Object[]{bimage});
}
catch (InvocationTargetException ie)
{
final Throwable throwable = ie.getTargetException();
if (throwable instanceof IOException)
{
// Yeah, it is ugly, but the use of reflection hides the exception..
throw (IOException) throwable;
}
// ignore the throwable ..
throw new UnsupportedEncoderException("Failed to run the encoder", throwable);
}
catch (Throwable t)
{
// ignore the throwable ..
throw new UnsupportedEncoderException("Failed to run the encoder", t);
}
}
public void encodeImage(final Image image,
final OutputStream outputStream) throws IOException, UnsupportedEncoderException
{
try
{
final ClassLoader loader = ObjectUtilities.getClassLoader(JpegImageEncoder.class);
final Class codecClass = Class.forName(ENCODER_CLASS, false, loader);
final Method createEncoderMethod = codecClass.getMethod("createJPEGEncoder", new Class[]{OutputStream.class});
final Object encoder = createEncoderMethod.invoke(null, new Object[]{outputStream});
final Class encoderClass = encoder.getClass();
final Method encodeMethod = encoderClass.getMethod("encode", new Class[]{Image.class});
encodeMethod.invoke(encoder, new Object[]{image});
}
catch (InvocationTargetException ie)
{
final Throwable throwable = ie.getTargetException();
if (throwable instanceof IOException)
{
// Yeah, it is ugly, but the use of reflection hides the exception..
throw (IOException) throwable;
}
// ignore the throwable ..
throw new UnsupportedEncoderException("Failed to run the encoder", throwable);
}
catch (Throwable t)
{
// ignore the throwable ..
throw new UnsupportedEncoderException("Failed to run the encoder", t);
}
}
public String getMimeType()
{
return "image/jpg";
}
public static boolean isJpegEncodingAvailable()
{
try
{
final ClassLoader loader = ObjectUtilities.getClassLoader(JpegImageEncoder.class);
final Class aClass = Class.forName(ENCODER_CLASS, false, loader);
return aClass != null;
}
catch (Throwable t)
{
// ignore the throwable ..
return false;
}
}
}
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