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https://issues.apache.org/jira/browse/FOP-3271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Gibson updated FOP-3271:
------------------------------
Attachment: reproduction.zip
> pdf-images: Fail to render accessible pdf image in accessible PDF output when
> "Artifact" elements present in image
> ------------------------------------------------------------------------------------------------------------------
>
> Key: FOP-3271
> URL: https://issues.apache.org/jira/browse/FOP-3271
> Project: FOP
> Issue Type: Bug
> Components: renderer/pdf
> Affects Versions: 2.10, 2.11
> Reporter: Mark Gibson
> Priority: Major
> Attachments: image1-artifactNotInParentsChildren.png,
> image2-artifactNotInParentsChildren.png, reproduction.zip
>
>
> We have PDF images that are exported direct from Excel (with accessibility
> enabled). When rendering an accessible PDF output, the images fail to get
> rendered in final PDF output.
> FOP logs show an index out of bounds exception:
> {code:java}
> Caused by: java.lang.IndexOutOfBoundsException: Index -1 out of bounds for
> length 6
> at
> java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:100)
> at
> java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:106)
> at
> java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302)
> at java.base/java.util.Objects.checkIndex(Objects.java:385)
> at java.base/java.util.ArrayList.get(ArrayList.java:427)
> at
> org.apache.fop.pdf.PDFStructElem.addKidInSpecificOrder(PDFStructElem.java:208)
> at
> org.apache.fop.render.pdf.pdfbox.StructureTreeMerger.createParents(StructureTreeMerger.java:209)
> at
> org.apache.fop.render.pdf.pdfbox.StructureTreeMerger.createParents(StructureTreeMerger.java:154)
> at
> org.apache.fop.render.pdf.pdfbox.StructureTreeMerger.copyStructure(StructureTreeMerger.java:89)
> at
> org.apache.fop.render.pdf.pdfbox.TaggedPDFConductor.handleLogicalStructure(TaggedPDFConductor.java:68)
> at
> org.apache.fop.render.pdf.pdfbox.AbstractPDFBoxHandler.createStreamForPDF(AbstractPDFBoxHandler.java:114)
> at
> org.apache.fop.render.pdf.pdfbox.PDFBoxImageHandler.handleImage(PDFBoxImageHandler.java:77)
> ... 62 more{code}
>
> Because the following method returns -1 ...
> {code:java}
> public final class StructureTreeMergerUtil {
> public static int findObjectPositionInKidsArray(COSObject kidObj) {
> COSDictionary kid = (COSDictionary) kidObj.getObject();
> COSObject parentObj = (COSObject) kid.getItem(COSName.P);
> COSDictionary parent = (COSDictionary) parentObj.getObject();
> COSBase kids = parent.getItem(COSName.K);
> if (kids instanceof COSArray) {
> COSArray kidsArray = (COSArray)kids;
> return kidsArray.indexOfObject(kid);
> } else {
> return 0;
> }
> } {code}
> It turns out that the Excel exported PDF images have records that do not
> exist in that record's parent's children. This can be seen in the attached
> images, and are always "Artifact" records (although I'm not sure that means
> all artifact records are always broken).
> I've also attached a reproduction with a simple fo file, and two pdf images
> that present this issue. Command to execute it is
> {code:java}
> fop.bat -a -fo test.fo -pdf test.pdf {code}
>
> My PDF spec knowledge is low. So I'm currently unsure whether Excel is
> producing broken PDFs, or whether there is a bug in FOP's pdf-image handling
> when copying over the structure tree on externally imported PDF images.
>
> Hoping someone can shed some light here.
>
> Maybe the fix would be as simple as returning 0 instead of -1 from the above
> method?
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