| /* |
| |
| 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.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 <a href="mailto:tkormann@apache.org">Thierry Kormann</a> |
| * @version $Id$ |
| */ |
| public class SVGFeGaussianBlurElementBridge |
| extends AbstractSVGFilterPrimitiveElementBridge { |
| |
| |
| /** |
| * Constructs a new bridge for the <feGaussianBlur> element. |
| */ |
| public SVGFeGaussianBlurElementBridge() {} |
| |
| /** |
| * Returns 'feGaussianBlur'. |
| */ |
| public String getLocalName() { |
| return SVG_FE_GAUSSIAN_BLUR_TAG; |
| } |
| |
| /** |
| * 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. |
| * |
| * @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; |
| } |
| } |