[BATIK-1207] NPE with different PNGTranscoder.KEY_WIDTH, PNGTranscoder.KEY_HEIGHT

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Not A Problem
• Affects Version/s: 1.9
• Component/s: SVG Rasterizer
• Labels: KEY_HEIGHT KEY_WIDTH PNGTranscoder
• Environment: Debian 9 ; SDK 1.8.0_151
• Assignee: Unassigned
• Reporter: Pascual Lorente
• Created: 06/Nov/17 15:40
• Updated: 23/Nov/17 12:53
• Resolved: 23/Nov/17 12:53

Description

I'm having a tough time with PNGTranscoder. I am rendering an SVG document into a PNG image of different sizes. For that, I use a factor.

final float factor = 1.0f;

// Load document
final SAXSVGDocumentFactory DOCUMENT_FACTORY = new SAXSVGDocumentFactory(XMLResourceDescriptor.getXMLParserClassName());
SVGDocument document = DOCUMENT_FACTORY.createSVGDocument("ehld.svg");

// Extract original height and width
final SVGSVGElement root = document.getRootElement();
final String viewBox = root.getAttributes().getNamedItem("viewBox").getNodeValue();
final Scanner scanner = new Scanner(viewBox);
scanner.useLocale(Locale.UK);
float x = scanner.nextFloat();
float y = scanner.nextFloat();
float width = scanner.nextFloat();
float height = scanner.nextFloat();

// Set png width and height
final float w = width * factor;
final float h = height * factor;
final ImageTranscoder transcoder = new PNGTranscoder();
transcoder.addTranscodingHint(PNGTranscoder.KEY_WIDTH, w);
transcoder.addTranscodingHint(PNGTranscoder.KEY_HEIGHT, h);

// Export
final TranscoderInput input = new TranscoderInput(document);
final File file = new File("output.png");
final TranscoderOutput output = new TranscoderOutput(new FileOutputStream(file));
transcoder.transcode(input, output);

For some factors, it works nicely, but there are some of them that crash with:

Enclosed Exception:
Unable to transform src image
at org.apache.batik.transcoder.image.ImageTranscoder.transcode(ImageTranscoder.java:132)
at org.apache.batik.transcoder.XMLAbstractTranscoder.transcode(XMLAbstractTranscoder.java:142)
at org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:156)
at visual.VisualTesting.test(VisualTesting.java:298)
at visual.VisualTesting.main(VisualTesting.java:64)

From 0.1 to 2.0 (step 0.1) it does NOT work with 0.7, 1.3, 1.4, 1.5, 1.7.

When I remove the filter in the SVG document (style="filter:url(#selection-filter)", line 1188) problems dissapear.

Not sure if a bug or a misusage. Thanks