/*****************************************************************************
* Copyright (C) The Apache Software Foundation. All rights reserved. *
* ------------------------------------------------------------------------- *
* This software is published under the terms of the Apache Software License *
* version 1.1, a copy of which has been included with this distribution in *
* the LICENSE file. *
*****************************************************************************/
package org.apache.batik.bridge;
import java.awt.geom.Rectangle2D;
import java.util.Map;
import java.util.StringTokenizer;
import org.apache.batik.ext.awt.image.PadMode;
import org.apache.batik.ext.awt.image.renderable.Filter;
import org.apache.batik.ext.awt.image.renderable.GaussianBlurRable8Bit;
import org.apache.batik.ext.awt.image.renderable.PadRable;
import org.apache.batik.ext.awt.image.renderable.PadRable8Bit;
import org.apache.batik.gvt.GraphicsNode;
import org.w3c.dom.Element;
/**
* Bridge class for the <feGaussianBlur> element.
*
* @author <a href="mailto:tkormann@apache.org">Thierry Kormann</a>
* @version $Id: SVGFeGaussianBlurElementBridge.java,v 1.16 2003/04/11 13:54:47 vhardy Exp $
*/
public class SVGFeGaussianBlurElementBridge
extends AbstractSVGFilterPrimitiveElementBridge {
/**
* Constructs a new bridge for the <feGaussianBlur> element.
*/
public SVGFeGaussianBlurElementBridge() {}
/**
* Returns 'feGaussianBlur'.
*/
public String getLocalName() {
return SVG_FE_GAUSSIAN_BLUR_TAG;
}
/**
* Creates a <tt>Filter</tt> primitive according to the specified
* parameters.
*
* @param ctx the bridge context to use
* @param filterElement the element that defines a filter
* @param filteredElement the element that references the filter
* @param filteredNode the graphics node to filter
*
* @param inputFilter the <tt>Filter</tt> that represents the current
* filter input if the filter chain.
* @param filterRegion the filter area defined for the filter chain
* the new node will be part of.
* @param filterMap a map where the mediator can map a name to the
* <tt>Filter</tt> it creates. Other <tt>FilterBridge</tt>s
* can then access a filter node from the filterMap if they
* know its name.
*/
public Filter createFilter(BridgeContext ctx,
Element filterElement,
Element filteredElement,
GraphicsNode filteredNode,
Filter inputFilter,
Rectangle2D filterRegion,
Map filterMap) {
// 'stdDeviation' attribute - default is [0, 0]
float [] stdDeviationXY = convertStdDeviation(filterElement);
if (stdDeviationXY[0] < 0 || stdDeviationXY[1] < 0) {
throw new BridgeException(filterElement,
ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_STD_DEVIATION_ATTRIBUTE,
"" + stdDeviationXY[0] +
stdDeviationXY[1]});
}
// 'in' attribute
Filter in = getIn(filterElement,
filteredElement,
filteredNode,
inputFilter,
filterMap,
ctx);
if (in == null) {
return null; // disable the filter
}
// Default region is the size of in (if in is SourceGraphic or
// SourceAlpha it will already include a pad/crop to the
// proper filter region size).
Rectangle2D defaultRegion = in.getBounds2D();
Rectangle2D primitiveRegion
= SVGUtilities.convertFilterPrimitiveRegion(filterElement,
filteredElement,
filteredNode,
defaultRegion,
filterRegion,
ctx);
// Take the filter primitive region into account, we need to
// pad/crop the input and output.
PadRable pad = new PadRable8Bit(in, primitiveRegion, PadMode.ZERO_PAD);
// build filter
Filter blur = new GaussianBlurRable8Bit
(pad, stdDeviationXY[0], stdDeviationXY[1]);
// handle the 'color-interpolation-filters' property
handleColorInterpolationFilters(blur, filterElement);
PadRable filter
= new PadRable8Bit(blur, primitiveRegion, PadMode.ZERO_PAD);
// update the filter Map
updateFilterMap(filterElement, filter, filterMap);
return filter;
}
/**
* Returns the standard deviation of the specified feGaussianBlur
* filter primitive element.
*
* @param filterElement the feGaussianBlur filter primitive element
*/
protected static float [] convertStdDeviation(Element filterElement) {
String s
= filterElement.getAttributeNS(null, SVG_STD_DEVIATION_ATTRIBUTE);
if (s.length() == 0) {
return new float[] {0, 0};
}
float [] stdDevs = new float[2];
StringTokenizer tokens = new StringTokenizer(s, " ,");
try {
stdDevs[0] = SVGUtilities.convertSVGNumber(tokens.nextToken());
if (tokens.hasMoreTokens()) {
stdDevs[1] = SVGUtilities.convertSVGNumber(tokens.nextToken());
} else {
stdDevs[1] = stdDevs[0];
}
} catch (NumberFormatException ex) {
throw new BridgeException
(filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_STD_DEVIATION_ATTRIBUTE, s, ex});
}
if (tokens.hasMoreTokens()) {
throw new BridgeException
(filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_STD_DEVIATION_ATTRIBUTE, s});
}
return stdDevs;
}
}