Fixed a multi-threading bug for SVG images included through svg:image inside SVG document. Similar to the fix required in PDFImageHandlerSVG. The SVG DOM must be cloned because Batik attaches the CSS parser to the DOM tree and manipulates the same.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1141461 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/svg/AbstractFOPImageElementBridge.java

@@ -23,11 +23,15 @@ import java.awt.Graphics2D;
 import java.awt.Shape;
 import java.awt.geom.Rectangle2D;
 
+import org.w3c.dom.Element;
+import org.w3c.dom.svg.SVGDocument;
+
 import org.apache.batik.bridge.BridgeContext;
 import org.apache.batik.bridge.SVGImageElementBridge;
 import org.apache.batik.gvt.AbstractGraphicsNode;
 import org.apache.batik.gvt.GraphicsNode;
 import org.apache.batik.util.ParsedURL;
+
 import org.apache.xmlgraphics.image.loader.Image;
 import org.apache.xmlgraphics.image.loader.ImageException;
 import org.apache.xmlgraphics.image.loader.ImageFlavor;
@@ -39,8 +43,8 @@ import org.apache.xmlgraphics.image.loader.impl.ImageRawCCITTFax;
 import org.apache.xmlgraphics.image.loader.impl.ImageRawJPEG;
 import org.apache.xmlgraphics.image.loader.impl.ImageXMLDOM;
 import org.apache.xmlgraphics.java2d.Graphics2DImagePainter;
-import org.w3c.dom.Element;
-import org.w3c.dom.svg.SVGDocument;
+
+import org.apache.fop.image.loader.batik.BatikUtil;
 
 /**
  * Bridge class for the <image> element when jpeg images.
@@ -63,6 +67,7 @@ public abstract class AbstractFOPImageElementBridge extends SVGImageElementBridg
      * @param purl the parsed url for the image resource
      * @return a new graphics node
      */
+    @Override
     protected GraphicsNode createImageGraphicsNode
                 (BridgeContext ctx, Element imageElement, ParsedURL purl) {
         AbstractFOPBridgeContext bridgeCtx = (AbstractFOPBridgeContext)ctx;
@@ -80,8 +85,11 @@ public abstract class AbstractFOPImageElementBridge extends SVGImageElementBridg
             if (image instanceof ImageXMLDOM) {
                 ImageXMLDOM xmlImage = (ImageXMLDOM)image;
                 if (xmlImage.getDocument() instanceof SVGDocument) {
-                    return createSVGImageNode(ctx, imageElement,
-                            (SVGDocument)xmlImage.getDocument());
+                    //Clone DOM because the Batik's CSS Parser attaches to the DOM and is therefore
+                    //no thread-safe.
+                    SVGDocument clonedDoc = (SVGDocument)BatikUtil.cloneSVGDocument(
+                            xmlImage.getDocument());
+                    return createSVGImageNode(ctx, imageElement, clonedDoc);
                 } else {
                     //Convert image to Graphics2D
                     image = manager.convertImage(xmlImage,

status.xml

@@ -60,6 +60,9 @@
       documents. Example: the fix of marks layering will be such a case when it's done.
     -->
     <release version="FOP Trunk" date="TBD">
+      <action context="Renderers" dev="JM" type="fix">
+        Fixed a multi-threading bug for SVG images included through svg:image inside SVG documents.
+      </action>
       <action context="Renderers" dev="PH" type="add">
         Added an IFDocumentHandler filter for triggering rendering events.  Created an Event that
         captures an end page event with the page number.