Roderick McMullen created BATIK-1384:
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Summary: SVGDescriptor returned with overridden
DefaultExtensionHandler.handleComposite() is ignored the first time after
creation
Key: BATIK-1384
URL: https://issues.apache.org/jira/browse/BATIK-1384
Project: Batik
Issue Type: Bug
Components: SVGGraphics2D
Affects Versions: 1.19
Reporter: Roderick McMullen
Attachments: batik-blendmode-issue.zip
To convert PDF pages with blend mode ({{/BM}}) composites to SVG, we provide an
override to {{DefaultExtensionHandler.handleComposite}} that returns an
{{SVGCompositeDescriptor}} with overridden
{{SVGCompositeDescriptor.getAttributeMap}} that adds {{mix-blend-mode}}.
However, {{SVGCustomComposite.toSVG}} returns null rather than our object from
[SVGCustomComposite.java#L83|https://github.com/apache/xmlgraphics-batik/blob/55478175f63517cfb5ce9b16afe2591fd7caab96/batik-svggen/src/main/java/org/apache/batik/svggen/SVGCustomComposite.java#L83].
Unless the {{Composite}} is encountered again and the cached
{{SVGCompositeDescriptor}} is retrieved for use,
[SVGGraphicContextConverter.java#L103|https://github.com/apache/xmlgraphics-batik/blob/55478175f63517cfb5ce9b16afe2591fd7caab96/batik-svggen/src/main/java/org/apache/batik/svggen/SVGGraphicContextConverter.java#L103]
is not reached and overridden {{SVGCompositeDescriptor.getAttributeMap}} is
unused.
*Steps to reproduce*
# Unzip attached project [^batik-blendmode-issue.zip] and open folder with
VSCode.
# Compile the project.
# Run and Debug launch config 'blendmode-pdflib-apryse.pdf-page1' to create
'target/blendmode-pdflib-apryse.pdf-page1.svg'.
# Done.
*Expected*
3. Occurrences of CSS attribute {{mix-blend-mode}} are found in output SVG.
e.g. {{mix-blend-mode:multiply}}
*Actual*
3. No occurrences of {{mix-blend-mode}} found in output SVG.
attached project [^batik-blendmode-issue.zip]
{noformat}
batik-blendmode-issue.zip!\blendmode-pdflib-apryse.pdf
batik-blendmode-issue.zip!\blendmode-pdflib-apryse.pdf-page1-actual.svg
batik-blendmode-issue.zip!\blendmode-pdflib-apryse.pdf-page1-expected.svg
batik-blendmode-issue.zip!\pom.xml
batik-blendmode-issue.zip!\.vscode\launch.json
batik-blendmode-issue.zip!\src\main\java\com\snowbound\pdf\batik\RmjCompositeDescriptor.java
batik-blendmode-issue.zip!\src\main\java\com\snowbound\pdf\batik\RmjConstants.java
batik-blendmode-issue.zip!\src\main\java\com\snowbound\pdf\batik\RmjExtensionHandler.java
batik-blendmode-issue.zip!\src\main\java\com\snowbound\sample\pdf\SingleConversion.java
batik-blendmode-issue.zip1\target\blendmode-pdflib-apryse.pdf-page1.png
batik-blendmode-issue.zip1\target\blendmode-pdflib-apryse.pdf-page1.svg
{noformat}
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