JAVA : SVG converter to PNG get 'pattern' wrong

Question

I want to convert svg file to png format with batik1.7, my code like :

public static void convertSvgToPng(InputStream in, FileOutputStream fos) {
    try {
        PNGTranscoder t = new PNGTranscoder();
        TranscoderInput input = new TranscoderInput(in);
        TranscoderOutput output = new TranscoderOutput(fos);
        t.transcode(input, output);
        fos.flush();
        fos.close();
    } catch (IOException ex) {
        Logger.getLogger(CreateFile.class.getName()).log(Level.SEVERE, null, ex);
    } catch (TranscoderException ex) {
        Logger.getLogger(CreateFile.class.getName()).log(Level.SEVERE, null, ex);
    }
}

But some image can't convert, and get this wrong :

org.apache.batik.bridge.BridgeException: null:-1
  The URI "#Unnamed_Pattern"
  specified on the element <pattern> is invalidat     org.apache.batik.bridge.SVGPatternElementBridge.extractPatternContent(SVGPatternElementBridge.java:260)
at org.apache.batik.bridge.SVGPatternElementBridge.createPaint(SVGPatternElementBridge.java:86)
at org.apache.batik.bridge.PaintServer.convertURIPaint(PaintServer.java:359)
at org.apache.batik.bridge.PaintServer.convertPaint(PaintServer.java:259)
at org.apache.batik.bridge.PaintServer.convertFillPaint(PaintServer.java:228)
at org.apache.batik.bridge.PaintServer.convertFillAndStroke(PaintServer.java:146)
at org.apache.batik.bridge.SVGShapeElementBridge.createShapePainter(SVGShapeElementBridge.java:117)
at org.apache.batik.bridge.SVGDecoratedShapeElementBridge.createFillStrokePainter(SVGDecoratedShapeElementBridge.java:58) ....

When I open svg with TXT, there are mang "pattern" tag. After I delete all the "pattern" with a program, convert success, but lose some detall. I think it is not a good way to solve this problem.It have any other way to slove this problem? Please help me.

The problem file ：

jsfiddle.net/asdzheng/BtFbX/1/

Answer 1

I have make it work after @BigBadaboom suggestion to use batik-rasterizer.jar replace batik-transcoder.jar. My codes are following :

import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.batik.apps.rasterizer.DestinationType;
import org.apache.batik.apps.rasterizer.SVGConverter;
import org.apache.batik.dom.svg.SAXSVGDocumentFactory;
import org.apache.batik.util.XMLResourceDescriptor;
import org.w3c.dom.Document;


public class DOMRasterizer {

public Document createDocument(InputStream in) {
    Document doc = null ;
    try {
        // Create a new svg document.
        String parser = XMLResourceDescriptor.getXMLParserClassName();
        SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);
        doc = f.createSVGDocument(null, in);

    } catch (IOException ex) {
        Logger.getLogger(DOMRasterizer.class.getName()).log(Level.SEVERE, null, ex);
    }
    return doc;
}

public static void main(String[] args) throws Exception {

    DOMRasterizer rasterizer = new DOMRasterizer();
    InputStream in = new FileInputStream(new File("your svg path"));
    Document svgXmlDoc = rasterizer.createDocument(in);

    // Save this SVG into a file (required by SVG -> PNG transformation process)
    File svgFile = File.createTempFile("graphic-", ".svg");
    Transformer transformer = TransformerFactory.newInstance().newTransformer();
    DOMSource source = new DOMSource(svgXmlDoc);
    FileOutputStream fos = new FileOutputStream(svgFile);
    try {
        transformer.transform(source, new StreamResult(fos));
    } finally {
        fos.close();
    }
    // Convert the SVG into PNG
    File outputFile =new File("output path");
    SVGConverter converter = new SVGConverter();
    converter.setDestinationType(DestinationType.PNG);
    converter.setSources(new String[]{svgFile.toString()});
    converter.setDst(outputFile);
    converter.execute();
}
}

And I have the following JARs :

• batik-all-1.7.jar

• commons-io-1.3.1.jar

• commons-logging-1.0.4.jar

• xml-apis-ext.jar

Answer 2

From the error it sounds like the file has a reference to a pattern ("Unnamed_Pattern") that doesn't exist.

What you could try is to search the file for the reference ("Unnamed_Pattern"). When you find it, it will probably be something like this:

fill="url(#Unnamed_Pattern)"

Then either delete the attribute, or change it to fill="none". Note that there may be more than one reference to that non-existent pattern in the file.

But to be absolutely certain, we need to see the original file, as Robert says.