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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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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:Thierry Kormann
Version:$Id: SVGFeGaussianBlurElementBridge.java 1805408 2017-08-18 12:21:52Z ssteiner $
/** * Bridge class for the &lt;feGaussianBlur&gt; element. * * @author <a href="mailto:tkormann@apache.org">Thierry Kormann</a> * @version $Id: SVGFeGaussianBlurElementBridge.java 1805408 2017-08-18 12:21:52Z ssteiner $ */
public class SVGFeGaussianBlurElementBridge extends AbstractSVGFilterPrimitiveElementBridge {
Constructs a new bridge for the <feGaussianBlur> element.
/** * Constructs a new bridge for the &lt;feGaussianBlur&gt; element. */
public SVGFeGaussianBlurElementBridge() {}
Returns 'feGaussianBlur'.
/** * Returns 'feGaussianBlur'. */
public String getLocalName() { return SVG_FE_GAUSSIAN_BLUR_TAG; }
Creates a Filter primitive according to the specified parameters.
Params:
  • ctx – the bridge context to use
  • filterElement – the element that defines a filter
  • filteredElement – the element that references the filter
  • filteredNode – the graphics node to filter
  • inputFilter – the Filter that represents the current filter input if the filter chain.
  • filterRegion – the filter area defined for the filter chain the new node will be part of.
  • filterMap – a map where the mediator can map a name to the Filter it creates. Other FilterBridges can then access a filter node from the filterMap if they know its name.
/** * Creates a <code>Filter</code> 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 <code>Filter</code> 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 * <code>Filter</code> it creates. Other <code>FilterBridge</code>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, ctx); if (stdDeviationXY[0] < 0 || stdDeviationXY[1] < 0) { throw new BridgeException(ctx, filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED, new Object[] {SVG_STD_DEVIATION_ATTRIBUTE, String.valueOf( 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.
Params:
  • filterElement – the feGaussianBlur filter primitive element
  • ctx – the BridgeContext to use for error information
/** * Returns the standard deviation of the specified feGaussianBlur * filter primitive element. * * @param filterElement the feGaussianBlur filter primitive element * @param ctx the BridgeContext to use for error information */
protected static float[] convertStdDeviation(Element filterElement, BridgeContext ctx) { 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 nfEx ) { throw new BridgeException (ctx, filterElement, nfEx, ERR_ATTRIBUTE_VALUE_MALFORMED, new Object[] {SVG_STD_DEVIATION_ATTRIBUTE, s, nfEx }); } if (tokens.hasMoreTokens()) { throw new BridgeException (ctx, filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED, new Object[] {SVG_STD_DEVIATION_ATTRIBUTE, s}); } return stdDevs; } }