Tilman Hausherr created PDFBOX-6155:
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Summary: AT (Adaptive template pixels) -1 byte skipped
Key: PDFBOX-6155
URL: https://issues.apache.org/jira/browse/PDFBOX-6155
Project: PDFBox
Issue Type: Sub-task
Components: JBIG2
Affects Versions: 3.0.4 JBIG2
Reporter: Tilman Hausherr
Assignee: Tilman Hausherr
Attachments: bitmap-symbol-textrefine-customat.pdf,
bitmap-symbol-textrefine-negative-delta-width.pdf, bitmap-symbol-textrefine.pdf
bitmap-symbol-textrefine-customat.pdf has a garbled shape, however
bitmap-symbol-textrefine.pdf doesn't. The difference is that one has 4 AT bytes.
After a lot of reading and searching I was able to trace it to
{{GenericRefinementRegion.updateOverride()}} which ignores AT bytes if they are
-1. However the specification says no such thing:
6.3.5.3 Fixed templates and adaptive templates
The AT pixel RA1 can be located anywhere in the field shown in Figure 7, not
including the current pixel. The AT pixel
RA2 can be located anywhere in the range (-128, -128) to (127, 127) in the
reference bitmap.
Just removing the two lines fixes the problem but ruins
bitmap-symbol-textrefine-negative-delta-width.pdf, which has all -1 so I'll
research that.
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