| /* |
| |
| 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.ComponentTransferFunction; |
| import org.apache.batik.ext.awt.image.ConcreteComponentTransferFunction; |
| import org.apache.batik.ext.awt.image.PadMode; |
| import org.apache.batik.ext.awt.image.renderable.ComponentTransferRable8Bit; |
| import org.apache.batik.ext.awt.image.renderable.Filter; |
| import org.apache.batik.ext.awt.image.renderable.PadRable8Bit; |
| import org.apache.batik.gvt.GraphicsNode; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Node; |
| |
| /** |
| * Bridge class for the <feComponentTransfer> element. |
| * |
| * @author <a href="mailto:tkormann@apache.org">Thierry Kormann</a> |
| * @version $Id$ |
| */ |
| public class SVGFeComponentTransferElementBridge |
| extends AbstractSVGFilterPrimitiveElementBridge { |
| |
| /** |
| * Constructs a new bridge for the <feComponentTransfer> element. |
| */ |
| public SVGFeComponentTransferElementBridge() {} |
| |
| /** |
| * Returns 'feComponentTransfer'. |
| */ |
| public String getLocalName() { |
| return SVG_FE_COMPONENT_TRANSFER_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) { |
| |
| // '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); |
| |
| // Now, extract the various transfer functions. They are |
| // defined in the filterElement's children. |
| // Functions are ordered as follow: r, g, b, a. |
| ComponentTransferFunction funcR = null; |
| ComponentTransferFunction funcG = null; |
| ComponentTransferFunction funcB = null; |
| ComponentTransferFunction funcA = null; |
| |
| for (Node n = filterElement.getFirstChild(); |
| n != null; |
| n = n.getNextSibling()) { |
| |
| if (n.getNodeType() != Node.ELEMENT_NODE) { |
| continue; |
| } |
| |
| Element e = (Element)n; |
| Bridge bridge = ctx.getBridge(e); |
| if (bridge == null || !(bridge instanceof SVGFeFuncElementBridge)) { |
| continue; |
| } |
| SVGFeFuncElementBridge funcBridge |
| = (SVGFeFuncElementBridge)bridge; |
| ComponentTransferFunction func |
| = funcBridge.createComponentTransferFunction(filterElement, e); |
| if (funcBridge instanceof SVGFeFuncRElementBridge) { |
| funcR = func; |
| } else if (funcBridge instanceof SVGFeFuncGElementBridge) { |
| funcG = func; |
| } else if (funcBridge instanceof SVGFeFuncBElementBridge) { |
| funcB = func; |
| } else if (funcBridge instanceof SVGFeFuncAElementBridge) { |
| funcA = func; |
| } |
| } |
| |
| Filter filter = new ComponentTransferRable8Bit |
| (in, funcA, funcR, funcG, funcB); |
| |
| // handle the 'color-interpolation-filters' property |
| handleColorInterpolationFilters(filter, filterElement); |
| |
| filter = new PadRable8Bit(filter, primitiveRegion, PadMode.ZERO_PAD); |
| |
| // update the filter Map |
| updateFilterMap(filterElement, filter, filterMap); |
| |
| return filter; |
| } |
| |
| /** |
| * Bridge class for the <feFuncA> element. |
| */ |
| public static class SVGFeFuncAElementBridge extends SVGFeFuncElementBridge { |
| |
| /** |
| * Constructs a new bridge for the <code>feFuncA</code> element. |
| */ |
| public SVGFeFuncAElementBridge() {} |
| |
| /** |
| * Returns 'feFuncA'. |
| */ |
| public String getLocalName() { |
| return SVG_FE_FUNC_A_TAG; |
| } |
| } |
| |
| /** |
| * Bridge class for the <feFuncR> element. |
| */ |
| public static class SVGFeFuncRElementBridge extends SVGFeFuncElementBridge { |
| |
| /** |
| * Constructs a new bridge for the <code>feFuncR</code> element. |
| */ |
| public SVGFeFuncRElementBridge() {} |
| |
| /** |
| * Returns 'feFuncR'. |
| */ |
| public String getLocalName() { |
| return SVG_FE_FUNC_R_TAG; |
| } |
| } |
| |
| /** |
| * Bridge class for the <feFuncG> element. |
| */ |
| public static class SVGFeFuncGElementBridge extends SVGFeFuncElementBridge { |
| |
| /** |
| * Constructs a new bridge for the <code>feFuncG</code> element. |
| */ |
| public SVGFeFuncGElementBridge() {} |
| |
| /** |
| * Returns 'feFuncG'. |
| */ |
| public String getLocalName() { |
| return SVG_FE_FUNC_G_TAG; |
| } |
| } |
| |
| /** |
| * Bridge class for the <feFuncB> element. |
| */ |
| public static class SVGFeFuncBElementBridge extends SVGFeFuncElementBridge { |
| |
| /** |
| * Constructs a new bridge for the <code>feFuncB</code> element. |
| */ |
| public SVGFeFuncBElementBridge() {} |
| |
| /** |
| * Returns 'feFuncB'. |
| */ |
| public String getLocalName() { |
| return SVG_FE_FUNC_B_TAG; |
| } |
| } |
| |
| /** |
| * The base bridge class for component transfer function. |
| */ |
| protected abstract static class SVGFeFuncElementBridge |
| extends AnimatableGenericSVGBridge { |
| |
| /** |
| * Constructs a new bridge for component transfer function. |
| */ |
| protected SVGFeFuncElementBridge() {} |
| |
| /** |
| * Creates a <code>ComponentTransferFunction</code> according to |
| * the specified parameters. |
| * |
| * @param filterElement the feComponentTransfer filter primitive element |
| * @param funcElement the feFuncX element |
| */ |
| public ComponentTransferFunction createComponentTransferFunction |
| (Element filterElement, Element funcElement) { |
| |
| int type = convertType(funcElement, ctx); |
| switch (type) { |
| case ComponentTransferFunction.DISCRETE: { |
| float [] v = convertTableValues(funcElement, ctx); |
| if (v == null) { |
| return ConcreteComponentTransferFunction.getIdentityTransfer(); |
| } else { |
| return ConcreteComponentTransferFunction.getDiscreteTransfer(v); |
| } |
| } |
| case ComponentTransferFunction.IDENTITY: { |
| return ConcreteComponentTransferFunction.getIdentityTransfer(); |
| } |
| case ComponentTransferFunction.GAMMA: { |
| // 'amplitude' attribute - default is 1 |
| float amplitude |
| = convertNumber(funcElement, SVG_AMPLITUDE_ATTRIBUTE, 1, ctx); |
| // 'exponent' attribute - default is 1 |
| float exponent |
| = convertNumber(funcElement, SVG_EXPONENT_ATTRIBUTE, 1, ctx); |
| // 'offset' attribute - default is 0 |
| float offset |
| = convertNumber(funcElement, SVG_OFFSET_ATTRIBUTE, 0, ctx); |
| |
| return ConcreteComponentTransferFunction.getGammaTransfer |
| (amplitude, exponent, offset); |
| } |
| case ComponentTransferFunction.LINEAR: { |
| // 'slope' attribute - default is 1 |
| float slope |
| = convertNumber(funcElement, SVG_SLOPE_ATTRIBUTE, 1, ctx); |
| // 'intercept' attribute - default is 0 |
| float intercept |
| = convertNumber(funcElement, SVG_INTERCEPT_ATTRIBUTE, 0, ctx); |
| |
| return ConcreteComponentTransferFunction.getLinearTransfer |
| (slope, intercept); |
| } |
| case ComponentTransferFunction.TABLE: { |
| float [] v = convertTableValues(funcElement, ctx); |
| if (v == null) { |
| return ConcreteComponentTransferFunction.getIdentityTransfer(); |
| } else { |
| return ConcreteComponentTransferFunction.getTableTransfer(v); |
| } |
| } |
| default: |
| throw new RuntimeException("invalid convertType:" + type ); // can't be reached |
| } |
| |
| } |
| |
| /** |
| * Converts the 'tableValues' attribute of the specified component |
| * transfer function element. |
| * |
| * @param e the element that represents a component transfer function |
| * @param ctx the BridgeContext to use for error information |
| */ |
| protected static float [] convertTableValues(Element e, BridgeContext ctx) { |
| String s = e.getAttributeNS(null, SVG_TABLE_VALUES_ATTRIBUTE); |
| if (s.length() == 0) { |
| return null; |
| } |
| StringTokenizer tokens = new StringTokenizer(s, " ,"); |
| float [] v = new float[tokens.countTokens()]; |
| try { |
| for (int i = 0; tokens.hasMoreTokens(); ++i) { |
| v[i] = SVGUtilities.convertSVGNumber(tokens.nextToken()); |
| } |
| } catch (NumberFormatException nfEx ) { |
| throw new BridgeException |
| (ctx, e, nfEx, ERR_ATTRIBUTE_VALUE_MALFORMED, |
| new Object[] {SVG_TABLE_VALUES_ATTRIBUTE, s}); |
| } |
| return v; |
| } |
| |
| /** |
| * Converts the type of the specified component transfert |
| * function element. |
| * |
| * @param e the element that represents a component transfer function |
| * @param ctx the BridgeContext to use for error information |
| */ |
| protected static int convertType(Element e, BridgeContext ctx) { |
| String s = e.getAttributeNS(null, SVG_TYPE_ATTRIBUTE); |
| if (s.length() == 0) { |
| throw new BridgeException(ctx, e, ERR_ATTRIBUTE_MISSING, |
| new Object[] {SVG_TYPE_ATTRIBUTE}); |
| } |
| if (SVG_DISCRETE_VALUE.equals(s)) { |
| return ComponentTransferFunction.DISCRETE; |
| } |
| if (SVG_IDENTITY_VALUE.equals(s)) { |
| return ComponentTransferFunction.IDENTITY; |
| } |
| if (SVG_GAMMA_VALUE.equals(s)) { |
| return ComponentTransferFunction.GAMMA; |
| } |
| if (SVG_LINEAR_VALUE.equals(s)) { |
| return ComponentTransferFunction.LINEAR; |
| } |
| if (SVG_TABLE_VALUE.equals(s)) { |
| return ComponentTransferFunction.TABLE; |
| } |
| throw new BridgeException(ctx, e, ERR_ATTRIBUTE_VALUE_MALFORMED, |
| new Object[] {SVG_TYPE_ATTRIBUTE, s}); |
| } |
| } |
| } |