/*
Copyright 2001-2003 The Apache Software Foundation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
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.MorphologyRable8Bit;
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 <feMorphology> element.
*
* @author <a href="mailto:tkormann@apache.org">Thierry Kormann</a>
* @version $Id: SVGFeMorphologyElementBridge.java,v 1.15 2004/08/18 07:12:34 vhardy Exp $
*/
public class SVGFeMorphologyElementBridge
extends AbstractSVGFilterPrimitiveElementBridge {
/**
* Constructs a new bridge for the <feMorphology> element.
*/
public SVGFeMorphologyElementBridge() {}
/**
* Returns 'feMorphology'.
*/
public String getLocalName() {
return SVG_FE_MORPHOLOGY_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) {
// 'radius' attribute - default is [0, 0]
float [] radii = convertRadius(filterElement);
if (radii[0] == 0 || radii[1] == 0) {
return null; // disable the filter
}
// 'operator' attribute - default is 'erode'
boolean isDilate = convertOperator(filterElement);
// '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 tfilter
Filter morphology
= new MorphologyRable8Bit(pad, radii[0], radii[1], isDilate);
// handle the 'color-interpolation-filters' property
handleColorInterpolationFilters(morphology, filterElement);
PadRable filter = new PadRable8Bit
(morphology, primitiveRegion, PadMode.ZERO_PAD);
// update the filter Map
updateFilterMap(filterElement, filter, filterMap);
return filter;
}
/**
* Returns the radius (or radii) of the specified feMorphology
* filter primitive.
*
* @param filterElement the feMorphology filter primitive
*/
protected static float [] convertRadius(Element filterElement) {
String s = filterElement.getAttributeNS(null, SVG_RADIUS_ATTRIBUTE);
if (s.length() == 0) {
return new float[] {0, 0};
}
float [] radii = new float[2];
StringTokenizer tokens = new StringTokenizer(s, " ,");
try {
radii[0] = SVGUtilities.convertSVGNumber(tokens.nextToken());
if (tokens.hasMoreTokens()) {
radii[1] = SVGUtilities.convertSVGNumber(tokens.nextToken());
} else {
radii[1] = radii[0];
}
} catch (NumberFormatException ex) {
throw new BridgeException
(filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_RADIUS_ATTRIBUTE, s, ex});
}
if (tokens.hasMoreTokens() || radii[0] < 0 || radii[1] < 0) {
throw new BridgeException
(filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_RADIUS_ATTRIBUTE, s});
}
return radii;
}
/**
* Returns the 'operator' of the specified feMorphology filter
* primitive.
*
* @param filterElement the feMorphology filter primitive
*/
protected static boolean convertOperator(Element filterElement) {
String s = filterElement.getAttributeNS(null, SVG_OPERATOR_ATTRIBUTE);
if (s.length() == 0) {
return false;
}
if (SVG_ERODE_VALUE.equals(s)) {
return false;
}
if (SVG_DILATE_VALUE.equals(s)) {
return true;
}
throw new BridgeException(filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_OPERATOR_ATTRIBUTE, s});
}
}