/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2006-2008, Open Source Geospatial Foundation (OSGeo)
*
* 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;
* version 2.1 of the License.
*
* 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.
*/
package org.geotools.coverage.processing.operation;
import java.awt.RenderingHints;
import java.awt.image.DataBuffer;
import java.awt.image.RenderedImage;
import javax.media.jai.Interpolation;
import javax.media.jai.InterpolationNearest;
import javax.media.jai.JAI;
import javax.media.jai.ParameterBlockJAI;
import javax.media.jai.PlanarImage;
import org.geotools.coverage.processing.BaseScaleOperationJAI;
import org.geotools.coverage.processing.OperationJAI;
import org.geotools.image.jai.Registry;
/**
* This operation is simply a wrapper for the JAI scale operation which allows
* me to arbitrarily scale and translate a rendered image.
*
* @source $URL$
* @version $Id$
* @author Simone Giannecchini
* @since 2.3
*
* @see javax.media.jai.operator.ScaleDescriptor
*/
public class Scale extends BaseScaleOperationJAI {
/**
* Serial number for cross-version compatibility.
*/
private static final long serialVersionUID = -3212656385631097713L;
/** Lock for unsetting native acceleration. */
private final static int[] lock = new int[1];
/**
* Default constructor.
*/
public Scale() {
super("Scale");
}
@Override
protected RenderedImage createRenderedImage(ParameterBlockJAI parameters, RenderingHints hints) {
final RenderedImage source = (RenderedImage) parameters.getSource(0);
final Interpolation interpolation;
if(parameters.getObjectParameter("interpolation")!=null)
interpolation=(Interpolation) parameters.getObjectParameter("interpolation");
else
if(hints.get(JAI.KEY_INTERPOLATION)!=null)
interpolation=(Interpolation) hints.get(JAI.KEY_INTERPOLATION);
else
{
//I am pretty sure this should not happen. However I am not sure we should throw an error
interpolation=null;
}
final int transferType = source.getSampleModel().getDataType();
final JAI processor = OperationJAI.getJAI(hints);
PlanarImage image;
if (interpolation!=null&&!(interpolation instanceof InterpolationNearest)
&& (transferType == DataBuffer.TYPE_FLOAT || transferType == DataBuffer.TYPE_DOUBLE)) {
synchronized (lock) {
/**
* Disables the native acceleration for the "Scale" operation.
* In JAI 1.1.2, the "Scale" operation on TYPE_FLOAT datatype
* with INTERP_BILINEAR interpolation cause an exception in the
* native code of medialib, which halt the Java Virtual Machine.
* Using the pure Java implementation instead resolve the
* problem.
*
* @todo Remove this hack when Sun will fix the medialib bug.
* See
* http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4906854
*/
Registry.setNativeAccelerationAllowed(getName(), false);
image = processor.createNS(getName(),
parameters, hints).getRendering();
/**
* see above
*/
Registry.setNativeAccelerationAllowed(getName(), true);
}
} else
image = processor.createNS(getName(), parameters, hints);
return image;
}
}