/*
* $RCSfile: MlibGradientRIF.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:55:57 $
* $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.ImageLayout;
import com.lightcrafts.mediax.jai.KernelJAI;
import com.lightcrafts.media.jai.opimage.RIFUtil;
/**
* A <code>RIF</code> supporting the "Gradient" operation in the
* rendered image mode using MediaLib.
*
* @see com.lightcrafts.mediax.jai.operator.GradientDescriptor
* @see MlibGradientOpImage
*/
public class MlibGradientRIF implements RenderedImageFactory {
/** Constructor. */
public MlibGradientRIF() {}
/**
* Creates a new instance of <code>MlibGradientOpImage</code> in
* the rendered image mode.
*
* @param args The source image and convolution kernel.
* @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;
}
/* Get BorderExtender from hints if any. */
BorderExtender extender = RIFUtil.getBorderExtenderHint(hints);
RenderedImage source = args.getRenderedSource(0);
/*
* Get the Horizontal & Vertical kernels.
* At this point these kernels should have the same width & height
*/
KernelJAI kern_h = (KernelJAI)args.getObjectParameter(0);
KernelJAI kern_v = (KernelJAI)args.getObjectParameter(1);
/* Get the width & height of the kernels. */
int kWidth = kern_h.getWidth();
int kHeight = kern_v.getHeight();
/* Check and see if the operation is a Sobel. */
float khdata[], kvdata[];
khdata = kern_h.getKernelData();
kvdata = kern_v.getKernelData();
if ((khdata[0] == -1.0F && khdata[1] == -2.0F && khdata[2] == -1.0F &&
khdata[3] == 0.0F && khdata[4] == 0.0F && khdata[5] == 0.0F &&
khdata[6] == 1.0F && khdata[7] == 2.0F && khdata[8] == 1.0F) &&
(kvdata[0] == -1.0F && kvdata[1] == 0.0F && kvdata[2] == 1.0F &&
kvdata[3] == -2.0F && kvdata[4] == 0.0F && kvdata[5] == 2.0F &&
kvdata[6] == -1.0F && kvdata[7] == 0.0F && kvdata[8] == 1.0F) &&
kWidth == 3 && kHeight == 3) {
return new MlibSobelOpImage(source,
extender, hints, layout,
kern_h);
}
/* Call the Generic version. */
return new MlibGradientOpImage(source,
extender, hints, layout,
kern_h,
kern_v);
}
}