001: /*
002:
003: Licensed to the Apache Software Foundation (ASF) under one or more
004: contributor license agreements. See the NOTICE file distributed with
005: this work for additional information regarding copyright ownership.
006: The ASF licenses this file to You under the Apache License, Version 2.0
007: (the "License"); you may not use this file except in compliance with
008: the License. You may obtain a copy of the License at
009:
010: http://www.apache.org/licenses/LICENSE-2.0
011:
012: Unless required by applicable law or agreed to in writing, software
013: distributed under the License is distributed on an "AS IS" BASIS,
014: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015: See the License for the specific language governing permissions and
016: limitations under the License.
017:
018: */
019: package org.apache.batik.bridge;
020:
021: import java.awt.geom.AffineTransform;
022: import java.awt.geom.Rectangle2D;
023: import java.util.Map;
024:
025: import org.apache.batik.ext.awt.image.PadMode;
026: import org.apache.batik.ext.awt.image.renderable.AffineRable8Bit;
027: import org.apache.batik.ext.awt.image.renderable.Filter;
028: import org.apache.batik.ext.awt.image.renderable.PadRable;
029: import org.apache.batik.ext.awt.image.renderable.PadRable8Bit;
030: import org.apache.batik.gvt.GraphicsNode;
031: import org.w3c.dom.Element;
032:
033: /**
034: * Bridge class for the <feOffset> element.
035: *
036: * @author <a href="mailto:tkormann@apache.org">Thierry Kormann</a>
037: * @version $Id: SVGFeOffsetElementBridge.java 475477 2006-11-15 22:44:28Z cam $
038: */
039: public class SVGFeOffsetElementBridge extends
040: AbstractSVGFilterPrimitiveElementBridge {
041:
042: /**
043: * Constructs a new bridge for the <feOffset> element.
044: */
045: public SVGFeOffsetElementBridge() {
046: }
047:
048: /**
049: * Returns 'feOffset'.
050: */
051: public String getLocalName() {
052: return SVG_FE_OFFSET_TAG;
053: }
054:
055: /**
056: * Creates a <tt>Filter</tt> primitive according to the specified
057: * parameters.
058: *
059: * @param ctx the bridge context to use
060: * @param filterElement the element that defines a filter
061: * @param filteredElement the element that references the filter
062: * @param filteredNode the graphics node to filter
063: *
064: * @param inputFilter the <tt>Filter</tt> that represents the current
065: * filter input if the filter chain.
066: * @param filterRegion the filter area defined for the filter chain
067: * the new node will be part of.
068: * @param filterMap a map where the mediator can map a name to the
069: * <tt>Filter</tt> it creates. Other <tt>FilterBridge</tt>s
070: * can then access a filter node from the filterMap if they
071: * know its name.
072: */
073: public Filter createFilter(BridgeContext ctx,
074: Element filterElement, Element filteredElement,
075: GraphicsNode filteredNode, Filter inputFilter,
076: Rectangle2D filterRegion, Map filterMap) {
077:
078: // 'in' attribute
079: Filter in = getIn(filterElement, filteredElement, filteredNode,
080: inputFilter, filterMap, ctx);
081: if (in == null) {
082: return null; // disable the filter
083: }
084:
085: // Default region is the size of in (if in is SourceGraphic or
086: // SourceAlpha it will already include a pad/crop to the
087: // proper filter region size).
088: Rectangle2D defaultRegion = in.getBounds2D();
089: Rectangle2D primitiveRegion = SVGUtilities
090: .convertFilterPrimitiveRegion(filterElement,
091: filteredElement, filteredNode, defaultRegion,
092: filterRegion, ctx);
093:
094: float dx = convertNumber(filterElement, SVG_DX_ATTRIBUTE, 0,
095: ctx);
096: float dy = convertNumber(filterElement, SVG_DY_ATTRIBUTE, 0,
097: ctx);
098: AffineTransform at = AffineTransform.getTranslateInstance(dx,
099: dy);
100:
101: // feOffset is a point operation. Therefore, to take the
102: // filter primitive region into account, only a pad operation
103: // on the input is required.
104: PadRable pad = new PadRable8Bit(in, primitiveRegion,
105: PadMode.ZERO_PAD);
106: Filter filter = new AffineRable8Bit(pad, at);
107: filter = new PadRable8Bit(filter, primitiveRegion,
108: PadMode.ZERO_PAD);
109:
110: // handle the 'color-interpolation-filters' property
111: handleColorInterpolationFilters(filter, filterElement);
112:
113: // update the filter Map
114: updateFilterMap(filterElement, filter, filterMap);
115:
116: return filter;
117: }
118: }
|