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https://issues.apache.org/jira/browse/PDFBOX-5252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17395248#comment-17395248
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Tilman Hausherr commented on PDFBOX-5252:
-----------------------------------------
Can you attach your file? This is more for "archiving" purpose, in case we
decide to work on this in the future. Or does this happen with every file you
tried?
> Corrupted fonts with rendering inside SwingWorker
> -------------------------------------------------
>
> Key: PDFBOX-5252
> URL: https://issues.apache.org/jira/browse/PDFBOX-5252
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox, Rendering
> Affects Versions: 2.0.24
> Reporter: Maxim
> Priority: Major
> Labels: concurrency, multithreading
> Attachments: MainWindow.java, Снимок.PNG
>
>
> Page rendering is a time-consuming operation, so I try to perform it in
> separate thread (via Swing Worker). It's mostly working, but sometimes I face
> error messages in my log. Then, in some cases fonts on rendered page might
> become corrupted (just like on attached picture, where word "istream" is
> rendered like "istrea" with wide "a"). I don't remember such issues using
> single-thread, but that's not suitable for me (application UI freezes if I
> perform rendering in the same thread).
> Here's a link to my PDF: https://disk.yandex.ru/i/bZMPleH_GosWug
> {code:java}
> авг 07, 2021 12:16:56 PM org.apache.pdfbox.filter.FlateFilter decompressавг
> 07, 2021 12:16:56 PM org.apache.pdfbox.filter.FlateFilter decompressWARNING:
> FlateFilter: premature end of stream due to a DataFormatExceptionавг 07, 2021
> 12:16:56 PM org.apache.pdfbox.pdmodel.font.PDCIDFontType0 <init>SEVERE: Can't
> read the embedded CFF font Fd2121547java.io.IOException: illegal offset value
> 132698 in CFF font at
> org.apache.fontbox.cff.CFFParser.readIndexDataOffsets(CFFParser.java:192) at
> org.apache.fontbox.cff.CFFParser.readIndexData(CFFParser.java:201) at
> org.apache.fontbox.cff.CFFParser.parseFont(CFFParser.java:486) at
> org.apache.fontbox.cff.CFFParser.parse(CFFParser.java:122) at
> org.apache.fontbox.cff.CFFParser.parse(CFFParser.java:75) at
> org.apache.pdfbox.pdmodel.font.PDCIDFontType0.<init>(PDCIDFontType0.java:100)
> at
> org.apache.pdfbox.pdmodel.font.PDFontFactory.createDescendantFont(PDFontFactory.java:135)
> at org.apache.pdfbox.pdmodel.font.PDType0Font.<init>(PDType0Font.java:196)
> at
> org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:97)
> at org.apache.pdfbox.pdmodel.PDResources.getFont(PDResources.java:146) at
> org.apache.pdfbox.contentstream.operator.text.SetFontAndSize.process(SetFontAndSize.java:66)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:933)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:514)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:492)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:155)
> at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:277) at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:347) at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:268) at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:228) at
> MainWindow$pageLoader.doInBackground(MainWindow.java:286) at
> MainWindow$pageLoader.doInBackground(MainWindow.java:1) at
> javax.swing.SwingWorker$1.call(Unknown Source) at
> java.util.concurrent.FutureTask.run(Unknown Source) at
> javax.swing.SwingWorker.run(Unknown Source) at
> java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at
> java.lang.Thread.run(Unknown Source)
> авг 07, 2021 12:16:57 PM org.apache.pdfbox.pdmodel.font.PDCIDFontType0
> <init>WARNING: Using fallback LiberationSans for CID-keyed font
> Fd2121547{code}
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