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https://issues.apache.org/jira/browse/PDFBOX-2171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14047135#comment-14047135
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Tilman Hausherr commented on PDFBOX-2171:
-----------------------------------------
Yes this was discussed before. Historically the height was used for shading,
and is still used in 1.8 because there there is a vertical flip needed. Yes it
can be removed, but I prefer that this be done after GSoC2014 is finished so
that my student doesn't have to change her copy of the code at this time.
> UnsupportedOperationException for stencil image / pattern
> ---------------------------------------------------------
>
> Key: PDFBOX-2171
> URL: https://issues.apache.org/jira/browse/PDFBOX-2171
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Labels: pattern
> Fix For: 2.0.0
>
> Attachments: 002-002710-p14-bad.png, 002-002710-p14-good.png,
> 002-002710-p14.pdf
>
>
> I get this with the attached image, which is page 14 of the file 002710.pdf in
> http://digitalcorpora.org/corp/nps/files/govdocs1/zipfiles/002.zip
> {code}
> java.lang.UnsupportedOperationException
> at
> org.apache.pdfbox.pdmodel.graphics.color.PDPattern.toPaint(PDPattern.java:104)
> at
> org.apache.pdfbox.util.operator.pagedrawer.Invoke.process(Invoke.java:76)
> {code}
> Invoke.java has a comment "TODO: pass page height?".
> After changing the code by passing the height (see also rev 1580326), running
> code in PDPattern.java is called and I get a better image. To see the
> difference, look at "Sailor springs" and "New Harmony Consolidated". In the
> "good" image there's a pattern which isn't in the "bad" image.
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