/*
* $RCSfile: MlibSubsampleAverageRIF.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:56:06 $
* $State: Exp $
*/package com.sun.media.jai.mlib;
import java.awt.RenderingHints;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.RenderedImageFactory;
import java.awt.image.renderable.ParameterBlock;
import javax.media.jai.ImageLayout;
import com.sun.media.jai.opimage.RIFUtil;
/**
* A <code>RIF</code> supporting the "SubsampleAverage" operation in the
* rendered image mode using MediaLib.
*
* @see javax.media.jai.operator.SubsampleaverageDescriptor
* @see MlibSubsampleAverageOpImage
*/
public class MlibSubsampleAverageRIF implements RenderedImageFactory {
/** Constructor. */
public MlibSubsampleAverageRIF() {}
/**
* Creates a new instance of <code>MlibSubsampleAverageOpImage</code> in
* the rendered image mode.
*
* @param args The source image, scale factors,
* and the <code>Interpolation</code>.
* @param hints May contain rendering hints and destination image layout.
*/
public RenderedImage create(ParameterBlock args,
RenderingHints hints) {
// Get the scale factors.
double scaleX = args.getDoubleParameter(0);
double scaleY = args.getDoubleParameter(1);
// If unity scaling return the source directly.
if(scaleX == 1.0 && scaleY == 1.0) {
return args.getRenderedSource(0);
}
// Get the layout.
ImageLayout layout = RIFUtil.getImageLayoutHint(hints);
// Check mediaLib compatibility.
if (!MediaLibAccessor.isMediaLibCompatible(args, layout) ||
!MediaLibAccessor.hasSameNumBands(args, layout)) {
// Return null to indicate to fallback to next RIF.
return null;
}
// Create and return the OpImage.
return new MlibSubsampleAverageOpImage(args.getRenderedSource(0),
layout, hints,
scaleX, scaleY);
}
}