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https://issues.apache.org/jira/browse/PDFBOX-4951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18093602#comment-18093602
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Tilman Hausherr commented on PDFBOX-4951:
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We're over 90% test coverage now, which is great. There's only one little
mystery that is near the end of GlyphLayoutProcessorAwt, the {{if (Math.abs(dx)
>= delta)}} segment, which is never reached. Was this something you got from
some other software you developed, or did it occur in your work here and if
yes, do you remember with which font and what text (because I made some font
changes)? I assume it means that there is some additional advancement.
> Sequences of DIN SPEC 91379 with combining letters are rendered incorrectly
> ---------------------------------------------------------------------------
>
> Key: PDFBOX-4951
> URL: https://issues.apache.org/jira/browse/PDFBOX-4951
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.21
> Reporter: Volker Kunert
> Priority: Major
> Attachments: DIN_SPEC_91379_Sequences-aa.pdf,
> DIN_SPEC_91379_Sequences-ab.pdf, DIN_SPEC_91379_Sequences-ac.pdf,
> DIN_SPEC_91379_Sequences.txt, DefaultScriptProcessor.java, DejaVuSans.ttf,
> DoGlyphLayoutBidi.pdf, DoGlyphLayoutDinSpec91379.pdf,
> DoGlyphLayoutDinSpec91379Form.pdf, DoGlyphPositionBengali.pdf,
> ExamplePdfboxFopPos-By-Tilman.pdf, ExamplePdfboxFopPos.java,
> ExamplePdfboxFopPos.pdf, ExamplePdfboxFopPosForm.java,
> ExamplePdfboxFopPosForm.pdf, FiraCode-Regular.ttf,
> FontForge-Lohit-Bengali.png, TestPdfbox.java, TestPdfboxFop2.java,
> TestPdfboxFop2.pdf, TestPdfboxJava2D.java, TestPdfboxJava2D.pdf, bidi-1.png,
> bidi-2.png, bidi.png, example-PDFBOX-3147-NotoSansThaiLooped-Regular.png,
> image-2026-05-23-16-16-53-442.png, image-2026-05-23-16-17-28-172.png,
> image-2026-05-26-16-49-45-529.png, ligatures-kerning.png,
> patch-2020-10-02.txt, pdfbox.patch, pdfbox.pdf, screenshot-1.png
>
>
> Accented Letters composed of Unicode base letter and combining accent are
> rendered wrong. E.g. with 0041 030B LATIN CAPITAL LETTER A WITH COMBINING
> DOUBLE ACUTE ACCENT the accent appears at the right hand side of the letter
> A, not above the letter A.
> The position is wrong for most of the sequences defined in the following spec:
> DIN SPEC 91379: Characters in Unicode for the electronic processing of names
> and data
> exchange in Europe; with digital attachment
> [https://www.xoev.de/downloads-2316#StringLatin]
> [https://www.din.de/de/wdc-beuth:din21:301228458]
>
> The correct rendering should look like the output of hb-view 2.6.8, see files
> DIN_SPEC_91379_Sequences*.pdf.
> The output of PDFBox is appended in pdfbox.pdf, which is created by running
> TestPdfbox.java. The sequences are read from file
> DIN_SPEC_91379_Sequences.txt.
>
> Font used for testing: NotoSansMono-Regular.ttf, see
> [https://www.google.com/get/noto/]
> download:
> [https://noto-website-2.storage.googleapis.com/pkgs/NotoSansMono-hinted.zip]
> See also FOP-2969
>
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