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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.render.pdf;
import java.awt.Color;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.io.IOException;
import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.bridge.GVTBuilder;
import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.batik.gvt.GraphicsNode;
import org.apache.batik.util.SVGConstants;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xmlgraphics.image.loader.Image;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.impl.ImageXMLDOM;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.image.loader.batik.BatikImageFlavors;
import org.apache.fop.image.loader.batik.BatikUtil;
import org.apache.fop.render.ImageHandler;
import org.apache.fop.render.RenderingContext;
import org.apache.fop.render.pdf.PDFLogicalStructureHandler.MarkedContentInfo;
import org.apache.fop.svg.PDFAElementBridge;
import org.apache.fop.svg.PDFBridgeContext;
import org.apache.fop.svg.PDFGraphics2D;
import org.apache.fop.svg.SVGEventProducer;
import org.apache.fop.svg.SVGUserAgent;
import org.w3c.dom.Document;
/**
* Image Handler implementation which handles SVG images.
*/
public class PDFImageHandlerSVG implements ImageHandler {
/** logging instance */
private static Log log = LogFactory.getLog(PDFImageHandlerSVG.class);
/** {@inheritDoc} */
public void handleImage(RenderingContext context, Image image, Rectangle pos)
throws IOException {
PDFRenderingContext pdfContext = (PDFRenderingContext)context;
PDFContentGenerator generator = pdfContext.getGenerator();
ImageXMLDOM imageSVG = (ImageXMLDOM)image;
FOUserAgent userAgent = context.getUserAgent();
final float deviceResolution = userAgent.getTargetResolution();
if (log.isDebugEnabled()) {
log.debug("Generating SVG at " + deviceResolution + "dpi.");
}
final float uaResolution = userAgent.getSourceResolution();
SVGUserAgent ua = new SVGUserAgent(userAgent, new AffineTransform());
GVTBuilder builder = new GVTBuilder();
//Controls whether text painted by Batik is generated using text or path operations
boolean strokeText = false;
//TODO connect with configuration elsewhere.
BridgeContext ctx = new PDFBridgeContext(ua,
(strokeText ? null : pdfContext.getFontInfo()),
userAgent.getFactory().getImageManager(),
userAgent.getImageSessionContext(),
new AffineTransform());
//Cloning SVG DOM as Batik attaches non-thread-safe facilities (like the CSS engine)
//to it.
Document clonedDoc = BatikUtil.cloneSVGDocument(imageSVG.getDocument());
GraphicsNode root;
try {
root = builder.build(ctx, clonedDoc);
builder = null;
} catch (Exception e) {
SVGEventProducer eventProducer = SVGEventProducer.Provider.get(
context.getUserAgent().getEventBroadcaster());
eventProducer.svgNotBuilt(this, e, image.getInfo().getOriginalURI());
return;
}
// get the 'width' and 'height' attributes of the SVG document
float w = image.getSize().getWidthMpt();
float h = image.getSize().getHeightMpt();
float sx = pos.width / w;
float sy = pos.height / h;
//Scaling and translation for the bounding box of the image
AffineTransform scaling = new AffineTransform(
sx, 0, 0, sy, pos.x / 1000f, pos.y / 1000f);
//Scale for higher resolution on-the-fly images from Batik
double s = uaResolution / deviceResolution;
AffineTransform resolutionScaling = new AffineTransform();
resolutionScaling.scale(s, s);
resolutionScaling.scale(1.0 / sx, 1.0 / sy);
//Transformation matrix that establishes the local coordinate system for the SVG graphic
//in relation to the current coordinate system
AffineTransform imageTransform = new AffineTransform();
imageTransform.concatenate(scaling);
imageTransform.concatenate(resolutionScaling);
/*
* Clip to the svg area.
* Note: To have the svg overlay (under) a text area then use
* an fo:block-container
*/
generator.comment("SVG setup");
generator.saveGraphicsState();
if (context.getUserAgent().isAccessibilityEnabled()) {
MarkedContentInfo mci = pdfContext.getMarkedContentInfo();
generator.beginMarkedContentSequence(mci.tag, mci.mcid);
}
generator.setColor(Color.black, false);
generator.setColor(Color.black, true);
if (!scaling.isIdentity()) {
generator.comment("viewbox");
generator.add(CTMHelper.toPDFString(scaling, false) + " cm\n");
}
//SVGSVGElement svg = ((SVGDocument)doc).getRootElement();
PDFGraphics2D graphics = new PDFGraphics2D(true, pdfContext.getFontInfo(),
generator.getDocument(),
generator.getResourceContext(), pdfContext.getPage().referencePDF(),
"", 0);
graphics.setGraphicContext(new org.apache.xmlgraphics.java2d.GraphicContext());
if (!resolutionScaling.isIdentity()) {
generator.comment("resolution scaling for " + uaResolution
+ " -> " + deviceResolution + "\n");
generator.add(
CTMHelper.toPDFString(resolutionScaling, false) + " cm\n");
graphics.scale(
1.0 / resolutionScaling.getScaleX(),
1.0 / resolutionScaling.getScaleY());
}
generator.comment("SVG start");
//Save state and update coordinate system for the SVG image
generator.getState().save();
generator.getState().concatenate(imageTransform);
//Now that we have the complete transformation matrix for the image, we can update the
//transformation matrix for the AElementBridge.
PDFAElementBridge aBridge = (PDFAElementBridge)ctx.getBridge(
SVGDOMImplementation.SVG_NAMESPACE_URI, SVGConstants.SVG_A_TAG);
aBridge.getCurrentTransform().setTransform(generator.getState().getTransform());
graphics.setPaintingState(generator.getState());
graphics.setOutputStream(generator.getOutputStream());
try {
root.paint(graphics);
generator.add(graphics.getString());
} catch (Exception e) {
SVGEventProducer eventProducer = SVGEventProducer.Provider.get(
context.getUserAgent().getEventBroadcaster());
eventProducer.svgRenderingError(this, e, image.getInfo().getOriginalURI());
}
generator.getState().restore();
if (context.getUserAgent().isAccessibilityEnabled()) {
generator.restoreGraphicsStateAccess();
} else {
generator.restoreGraphicsState();
}
generator.comment("SVG end");
}
/** {@inheritDoc} */
public int getPriority() {
return 400;
}
/** {@inheritDoc} */
public Class getSupportedImageClass() {
return ImageXMLDOM.class;
}
/** {@inheritDoc} */
public ImageFlavor[] getSupportedImageFlavors() {
return new ImageFlavor[] {
BatikImageFlavors.SVG_DOM
};
}
/** {@inheritDoc} */
public boolean isCompatible(RenderingContext targetContext, Image image) {
return (image == null
|| (image instanceof ImageXMLDOM
&& image.getFlavor().isCompatible(BatikImageFlavors.SVG_DOM)))
&& targetContext instanceof PDFRenderingContext;
}
}
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