/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 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.image.palette;
import java.awt.image.IndexColorModel;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import javax.media.jai.ImageLayout;
import javax.media.jai.PointOpImage;
/**
* {@link PointOpImage} to perform an efficient color inversion given a certain palette.
*
* @author Simone Giannecchini, GeoSolutions
*
*
* @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/coverage/src/main/java/org/geotools/image/palette/ColorInversion.java $
*/
@SuppressWarnings("unchecked")
public class ColorInversion extends PointOpImage {
private InverseColorMapRasterOp op;
public ColorInversion(RenderedImage image,IndexColorModel icm,
int quantizationColors, int alpaThreshold) {
super(image, new ImageLayout(image), null, false);
this.setSource(image, 0);
this.op=new InverseColorMapRasterOp(icm,quantizationColors,alpaThreshold);
// setlayout;
setImageLayout(
new ImageLayout(image).setColorModel(icm).setSampleModel(icm.createCompatibleSampleModel(image.getWidth(), image.getHeight())));
}
@Override
public Raster computeTile(int tx, int ty) {
final RenderedImage sourceImage = getSourceImage(0);
final Raster sourceRaster = sourceImage.getTile(tx, ty);
return op.filter(sourceRaster, null);
}
}