/*
* $RCSfile: MlibSubtractConstRIF.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:56:07 $
* $State: Exp $
*/
package com.sun.media.jai.mlib;
import java.awt.RenderingHints;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.awt.image.renderable.RenderedImageFactory;
import javax.media.jai.ImageLayout;
import java.util.Map;
import com.sun.media.jai.opimage.RIFUtil;
/**
* A <code>RIF</code> supporting the "SubtractConst" operation in the
* rendered image mode using MediaLib.
*
* @see javax.media.jai.operator.SubtractConstDescriptor
* @see MlibAddConstOpImage
*
*/
public class MlibSubtractConstRIF implements RenderedImageFactory {
/** Constructor. */
public MlibSubtractConstRIF() {}
/**
* Creates a new instance of <code>MlibAddConstOpImage</code> in
* the rendered image mode. By negating the constants, the result
* of "SubtractConst" is obtained.
*
* @param args The source image and the constants.
* @param hints May contain rendering hints and destination image layout.
*/
public RenderedImage create(ParameterBlock args,
RenderingHints hints) {
/* Get ImageLayout and TileCache from RenderingHints. */
ImageLayout layout = RIFUtil.getImageLayoutHint(hints);
if (!MediaLibAccessor.isMediaLibCompatible(args, layout) ||
!MediaLibAccessor.hasSameNumBands(args, layout)) {
return null;
}
/* Negate the constants vector. */
double[] constants = (double[])args.getObjectParameter(0);
int length = constants.length;
double[] negConstants = new double[length];
for (int i = 0; i < length; i++) {
negConstants[i] = -constants[i];
}
return new MlibAddConstOpImage(args.getRenderedSource(0),
hints, layout,
negConstants);
}
}