/*
* $RCSfile: MlibIDFTRIF.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:55:58 $
* $State: Exp $
*/
package com.lightcrafts.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 com.lightcrafts.mediax.jai.BorderExtender;
import com.lightcrafts.mediax.jai.EnumeratedParameter;
import com.lightcrafts.mediax.jai.ImageLayout;
import com.lightcrafts.mediax.jai.JAI;
import com.lightcrafts.mediax.jai.operator.DFTDescriptor;
import com.lightcrafts.media.jai.opimage.DFTOpImage;
import com.lightcrafts.media.jai.opimage.FFT;
import com.lightcrafts.media.jai.opimage.RIFUtil;
import com.lightcrafts.media.jai.util.MathJAI;
/**
* A <code>RIF</code> supporting the "IDFT" operation in the
* rendered image mode using MediaLib.
*
* @see com.lightcrafts.mediax.jai.operator.DFTDescriptor
* @see com.lightcrafts.mediax.jai.operator.IDFTDescriptor
* @see com.lightcrafts.media.jai.opimage.DFTOpImage
*
* @since EA4
*
*/
public class MlibIDFTRIF implements RenderedImageFactory {
/** Constructor. */
public MlibIDFTRIF() {}
/**
* Creates a new instance of <code>DFTOpImage</code> in
* the rendered image mode.
*
* @param args The source image.
* @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(new ParameterBlock())) {
return null;
}
RenderedImage source = args.getRenderedSource(0);
EnumeratedParameter scalingType =
(EnumeratedParameter)args.getObjectParameter(0);
EnumeratedParameter dataNature =
(EnumeratedParameter)args.getObjectParameter(1);
boolean isComplexSource =
!dataNature.equals(DFTDescriptor.REAL_TO_COMPLEX);
int numSourceBands = source.getSampleModel().getNumBands();
// Use the two-dimensional mediaLib DFT if possible: it supports
// only data which have a single component (real or complex)
// per pixel and which have dimensions which are equal to a positive
// power of 2.
if(((isComplexSource && numSourceBands == 2) ||
(!isComplexSource && numSourceBands == 1)) &&
MlibDFTOpImage.isAcceptableSampleModel(source.getSampleModel())) {
// If necessary, pad the source to ensure that
// both dimensions are positive powers of 2.
int sourceWidth = source.getWidth();
int sourceHeight = source.getHeight();
if(!MathJAI.isPositivePowerOf2(sourceWidth) ||
!MathJAI.isPositivePowerOf2(sourceHeight)) {
ParameterBlock pb = new ParameterBlock();
pb.addSource(source);
pb.add(0);
pb.add(MathJAI.nextPositivePowerOf2(sourceWidth) -
sourceWidth);
pb.add(0);
pb.add(MathJAI.nextPositivePowerOf2(sourceHeight) -
sourceHeight);
pb.add(BorderExtender.createInstance(BorderExtender.BORDER_ZERO));
source = JAI.create("border", pb);
}
return new MlibDFTOpImage(source, hints, layout, dataNature,
false, scalingType);
} else { // General case
FFT fft = new FFTmediaLib(false,
new Integer(scalingType.getValue()), 2);
return new DFTOpImage(source, hints, layout, dataNature, fft);
}
}
}