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https://issues.apache.org/jira/browse/PDFBOX-6199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18076801#comment-18076801
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Tilman Hausherr commented on PDFBOX-6199:
-----------------------------------------
This is how it looks currently:
!image-2026-04-28-12-27-28-955.png!
I asked copilot about this. Besides advice that are not relevant IMHO, it
suggested to move the "grReferenceValue = ..." segment in
decodeTypicalPredictedLineTemplate1() above the line "for (int minorX = 0;
minorX < minorWidth; minorX++)". The explanation: "previously
{{grReferenceValue}} was effectively “drifting” and not being re-anchored to
the current 3-line byte window at each byte boundary."
Doing so brings this:
!image-2026-04-28-12-28-19-575.png!
So the triangles are gone. Moving "context = ..." as well brings this:
!image-2026-04-28-12-29-21-038.png!
> Template 1 handling with TPGRON not supported
> ---------------------------------------------
>
> Key: PDFBOX-6199
> URL: https://issues.apache.org/jira/browse/PDFBOX-6199
> Project: PDFBox
> Issue Type: Sub-task
> Components: JBIG2
> Affects Versions: 3.0.4 JBIG2
> Reporter: Maruan Sahyoun
> Priority: Minor
> Attachments: image-2026-04-28-12-27-28-955.png,
> image-2026-04-28-12-28-19-575.png, image-2026-04-28-12-29-21-038.png
>
>
> {{bitmap-refine-template1-tpgron.jbig2}} tests the folling features of JBIG2:
> - Refinement region
> - Template 1
> - TPGRON
> - Reference bitmap reuse
> We currently produce garbled output when decoding
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