org.apache.batik.bridge.SVGMaskElementBridge Maven / Gradle / Ivy
/*
Licensed to the Apache Software Foundation (ASF) under one or more
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.AffineTransform;
import java.awt.geom.Rectangle2D;
import org.apache.batik.ext.awt.image.renderable.Filter;
import org.apache.batik.gvt.CompositeGraphicsNode;
import org.apache.batik.gvt.GraphicsNode;
import org.apache.batik.gvt.filter.Mask;
import org.apache.batik.gvt.filter.MaskRable8Bit;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* Bridge class for the <mask> element.
*
* @author Thierry Kormann
* @version $Id: SVGMaskElementBridge.java 1805408 2017-08-18 12:21:52Z ssteiner $
*/
public class SVGMaskElementBridge extends AnimatableGenericSVGBridge
implements MaskBridge {
/**
* Constructs a new bridge for the <mask> element.
*/
public SVGMaskElementBridge() {}
/**
* Returns 'mask'.
*/
public String getLocalName() {
return SVG_MASK_TAG;
}
/**
* Creates a Mask according to the specified parameters.
*
* @param ctx the bridge context to use
* @param maskElement the element that defines the mask
* @param maskedElement the element that references the mask element
* @param maskedNode the graphics node to mask
*/
public Mask createMask(BridgeContext ctx,
Element maskElement,
Element maskedElement,
GraphicsNode maskedNode) {
String s;
// get mask region using 'maskUnits'
Rectangle2D maskRegion = SVGUtilities.convertMaskRegion
(maskElement, maskedElement, maskedNode, ctx);
//
// Build the GVT tree that represents the mask
//
GVTBuilder builder = ctx.getGVTBuilder();
CompositeGraphicsNode maskNode = new CompositeGraphicsNode();
CompositeGraphicsNode maskNodeContent = new CompositeGraphicsNode();
maskNode.getChildren().add(maskNodeContent);
boolean hasChildren = false;
for(Node node = maskElement.getFirstChild();
node != null;
node = node.getNextSibling()){
// check if the node is a valid Element
if(node.getNodeType() != Node.ELEMENT_NODE) {
continue;
}
Element child = (Element)node;
GraphicsNode gn = builder.build(ctx, child) ;
if(gn == null) {
continue;
}
hasChildren = true;
maskNodeContent.getChildren().add(gn);
}
if (!hasChildren) {
return null; // empty mask
}
// 'transform' attribute
AffineTransform Tx;
s = maskElement.getAttributeNS(null, SVG_TRANSFORM_ATTRIBUTE);
if (s.length() != 0) {
Tx = SVGUtilities.convertTransform
(maskElement, SVG_TRANSFORM_ATTRIBUTE, s, ctx);
} else {
Tx = new AffineTransform();
}
// 'maskContentUnits' attribute - default is userSpaceOnUse
short coordSystemType;
s = maskElement.getAttributeNS(null, SVG_MASK_CONTENT_UNITS_ATTRIBUTE);
if (s.length() == 0) {
coordSystemType = SVGUtilities.USER_SPACE_ON_USE;
} else {
coordSystemType = SVGUtilities.parseCoordinateSystem
(maskElement, SVG_MASK_CONTENT_UNITS_ATTRIBUTE, s, ctx);
}
// additional transform to move to objectBoundingBox coordinate system
if (coordSystemType == SVGUtilities.OBJECT_BOUNDING_BOX) {
Tx = SVGUtilities.toObjectBBox(Tx, maskedNode);
}
maskNodeContent.setTransform(Tx);
Filter filter = maskedNode.getFilter();
if (filter == null) {
// Make the initial source as a RenderableImage
filter = maskedNode.getGraphicsNodeRable(true);
}
return new MaskRable8Bit(filter, maskNode, maskRegion);
}
}