/*
* 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.
*/
/* $Id: ImageConverterSVG2G2D.java 1296526 2012-03-03 00:18:45Z gadams $ */
package org.apache.fop.image.loader.batik;
import java.awt.Dimension;
import java.awt.geom.AffineTransform;
import java.util.Map;
import org.w3c.dom.Document;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.bridge.GVTBuilder;
import org.apache.batik.bridge.UserAgent;
import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.batik.gvt.GraphicsNode;
import org.apache.xmlgraphics.image.GraphicsConstants;
import org.apache.xmlgraphics.image.loader.Image;
import org.apache.xmlgraphics.image.loader.ImageException;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.ImageInfo;
import org.apache.xmlgraphics.image.loader.ImageManager;
import org.apache.xmlgraphics.image.loader.ImageProcessingHints;
import org.apache.xmlgraphics.image.loader.ImageSessionContext;
import org.apache.xmlgraphics.image.loader.XMLNamespaceEnabledImageFlavor;
import org.apache.xmlgraphics.image.loader.impl.AbstractImageConverter;
import org.apache.xmlgraphics.image.loader.impl.ImageGraphics2D;
import org.apache.xmlgraphics.image.loader.impl.ImageXMLDOM;
import org.apache.xmlgraphics.java2d.Graphics2DImagePainter;
import org.apache.xmlgraphics.util.UnitConv;
import org.apache.fop.svg.SimpleSVGUserAgent;
/**
* This ImageConverter converts SVG images to Java2D.
* <p>
* Note: The target flavor is "generic" Java2D. No Batik-specific bridges are hooked into the
* conversion process. Specialized renderers may want to provide specialized adapters to profit
* from target-format features (for example with PDF or PS). This converter is mainly for formats
* which only support bitmap images or rudimentary Java2D support.
*/
public class ImageConverterSVG2G2D extends AbstractImageConverter {
/** logger */
private static Log log = LogFactory.getLog(ImageConverterSVG2G2D.class);
/** {@inheritDoc} */
public Image convert(final Image src, Map hints) throws ImageException {
checkSourceFlavor(src);
final ImageXMLDOM svg = (ImageXMLDOM)src;
if (!SVGDOMImplementation.SVG_NAMESPACE_URI.equals(svg.getRootNamespace())) {
throw new IllegalArgumentException("XML DOM is not in the SVG namespace: "
+ svg.getRootNamespace());
}
//Prepare
float pxToMillimeter = UnitConv.IN2MM / GraphicsConstants.DEFAULT_DPI;
Number ptm = (Number)hints.get(ImageProcessingHints.SOURCE_RESOLUTION);
if (ptm != null) {
pxToMillimeter = (float)(UnitConv.IN2MM / ptm.doubleValue());
}
UserAgent ua = createBatikUserAgent(pxToMillimeter);
GVTBuilder builder = new GVTBuilder();
final ImageManager imageManager = (ImageManager)hints.get(
ImageProcessingHints.IMAGE_MANAGER);
final ImageSessionContext sessionContext = (ImageSessionContext)hints.get(
ImageProcessingHints.IMAGE_SESSION_CONTEXT);
boolean useEnhancedBridgeContext = (imageManager != null && sessionContext != null);
final BridgeContext ctx = (useEnhancedBridgeContext
? new GenericFOPBridgeContext(ua, null, imageManager, sessionContext)
: new BridgeContext(ua));
Document doc = svg.getDocument();
//Cloning SVG DOM as Batik attaches non-thread-safe facilities (like the CSS engine)
//to it.
Document clonedDoc = BatikUtil.cloneSVGDocument(doc);
//Build the GVT tree
final GraphicsNode root;
try {
root = builder.build(ctx, clonedDoc);
} catch (Exception e) {
throw new ImageException("GVT tree could not be built for SVG graphic", e);
}
//Create the painter
int width = svg.getSize().getWidthMpt();
int height = svg.getSize().getHeightMpt();
Dimension imageSize = new Dimension(width, height);
Graphics2DImagePainter painter = createPainter(ctx, root, imageSize);
//Create g2d image
ImageInfo imageInfo = src.getInfo();
ImageGraphics2D g2dImage = new ImageGraphics2D(imageInfo, painter);
return g2dImage;
}
/**
* Creates a user agent for Batik. Override to provide your own user agent.
* @param pxToMillimeter the source resolution (in px per millimeter)
* @return the newly created user agent
*/
protected SimpleSVGUserAgent createBatikUserAgent(float pxToMillimeter) {
return new SimpleSVGUserAgent(
pxToMillimeter,
new AffineTransform()) {
/** {@inheritDoc} */
public void displayMessage(String message) {
//TODO Refine and pipe through to caller
log.info(message);
}
/** {@inheritDoc} */
public void displayError(Exception e) {
log.error("Error converting SVG to a Java2D graphic", e);
}
/** {@inheritDoc} */
public void displayError(String message) {
log.error(message);
}
};
}
/**
* Creates a Graphics 2D image painter
*
* @param ctx the bridge context
* @param root the graphics node root
* @param imageSize the image size
* @return the newly created graphics 2d image painter
*/
protected Graphics2DImagePainter createPainter(
BridgeContext ctx, GraphicsNode root, Dimension imageSize) {
return new Graphics2DImagePainterImpl(root, ctx, imageSize);
}
/** {@inheritDoc} */
public ImageFlavor getSourceFlavor() {
return XMLNamespaceEnabledImageFlavor.SVG_DOM;
}
/** {@inheritDoc} */
public ImageFlavor getTargetFlavor() {
return ImageFlavor.GRAPHICS2D;
}
}