/*
* $RCSfile: BoxFilterRIF.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:56:16 $
* $State: Exp $
*/
package com.lightcrafts.media.jai.opimage;
import java.awt.RenderingHints;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.awt.image.renderable.RenderedImageFactory;
import java.util.Arrays;
import com.lightcrafts.mediax.jai.BorderExtender;
import com.lightcrafts.mediax.jai.ImageLayout;
import com.lightcrafts.mediax.jai.KernelJAI;
/**
* A <code>RIF</code> supporting the "BoxFilter" operation in the rendered
* image layer.
*
* @see com.lightcrafts.mediax.jai.operator.BoxFilterDescriptor
* @see com.lightcrafts.media.jai.opimage.SeparableConvolveOpImage
*
* @since EA4
*
*/
public class BoxFilterRIF implements RenderedImageFactory {
/** Constructor. */
public BoxFilterRIF() {}
/**
* Create a new instance of SeparableConvolveOpImage in the rendered layer.
* This method satisfies the implementation of RIF.
*
* @param paramBlock The source image and the convolution kernel.
*/
public RenderedImage create(ParameterBlock paramBlock,
RenderingHints renderHints) {
// Get ImageLayout from renderHints if any.
ImageLayout layout = RIFUtil.getImageLayoutHint(renderHints);
// Get BorderExtender from renderHints if any.
BorderExtender extender = RIFUtil.getBorderExtenderHint(renderHints);
// Get the operation parameters.
int width = paramBlock.getIntParameter(0);
int height = paramBlock.getIntParameter(1);
int xOrigin = paramBlock.getIntParameter(2);
int yOrigin = paramBlock.getIntParameter(3);
// Allocate and initialize arrays.
float[] dataH = new float[width];
Arrays.fill(dataH, 1.0F/(float)width);
float[] dataV = null;
if(height == width) {
dataV = dataH;
} else {
dataV = new float[height];
Arrays.fill(dataV, 1.0F/(float)height);
}
// Construct a separable kernel.
KernelJAI kernel = new KernelJAI(width, height, xOrigin, yOrigin,
dataH, dataV);
// Construct and return the OpImage.
return new SeparableConvolveOpImage(paramBlock.getRenderedSource(0),
extender,
renderHints,
layout,
kernel);
}
}