/*
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contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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: Thierry Kormann Version: $Id: SVGFeMorphologyElementBridge.java 1805408 2017-08-18 12:21:52Z ssteiner $
/**
* Bridge class for the <feMorphology> element.
*
* @author <a href="mailto:tkormann@apache.org">Thierry Kormann</a>
* @version $Id: SVGFeMorphologyElementBridge.java 1805408 2017-08-18 12:21:52Z ssteiner $
*/
public class SVGFeMorphologyElementBridge
extends AbstractSVGFilterPrimitiveElementBridge {
Constructs a new bridge for the <feMorphology> element.
/**
* Constructs a new bridge for the <feMorphology> element.
*/
public SVGFeMorphologyElementBridge() {}
Returns 'feMorphology'.
/**
* Returns 'feMorphology'.
*/
public String getLocalName() {
return SVG_FE_MORPHOLOGY_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) {
// 'radius' attribute - default is [0, 0]
float[] radii = convertRadius(filterElement, ctx);
if (radii[0] == 0 || radii[1] == 0) {
return null; // disable the filter
}
// 'operator' attribute - default is 'erode'
boolean isDilate = convertOperator(filterElement, ctx);
// '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.
Params: - filterElement – the feMorphology filter primitive
- ctx – the BridgeContext to use for error information
/**
* Returns the radius (or radii) of the specified feMorphology
* filter primitive.
*
* @param filterElement the feMorphology filter primitive
* @param ctx the BridgeContext to use for error information
*/
protected static float[] convertRadius(Element filterElement,
BridgeContext ctx) {
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 nfEx ) {
throw new BridgeException
(ctx, filterElement, nfEx, ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_RADIUS_ATTRIBUTE, s, nfEx });
}
if (tokens.hasMoreTokens() || radii[0] < 0 || radii[1] < 0) {
throw new BridgeException
(ctx, filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_RADIUS_ATTRIBUTE, s});
}
return radii;
}
Returns the 'operator' of the specified feMorphology filter
primitive.
Params: - filterElement – the feMorphology filter primitive
- ctx – the BridgeContext to use for error information
/**
* Returns the 'operator' of the specified feMorphology filter
* primitive.
*
* @param filterElement the feMorphology filter primitive
* @param ctx the BridgeContext to use for error information
*/
protected static boolean convertOperator(Element filterElement,
BridgeContext ctx) {
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
(ctx, filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_OPERATOR_ATTRIBUTE, s});
}
}