Michael Klink created PDFBOX-4236:
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Summary: PDFTextStripper diacritic merge sometimes chooses wrong
base glyph
Key: PDFBOX-4236
URL: https://issues.apache.org/jira/browse/PDFBOX-4236
Project: PDFBox
Issue Type: Bug
Components: Text extraction
Affects Versions: 3.0.0 PDFBox
Reporter: Michael Klink
Attachments: SA-U-NA.png, pattern3.pdf
In the course of answering [this stack overflow
question|https://stackoverflow.com/q/50664162/1729265] I saw that text
extraction from the example file pattern3.pdf exposes an error in the diacritic
merging code, the wrong base glyph is chosen.
>From the bottom of [my answer|https://stackoverflow.com/a/50679508/1729265]
>there:
{quote}By the way, your test file exposes an error in the PDFBox determination
of the base glyph to merge a diacritic with: The "स[1434]ु[1441]न[1418]" is
meant to be rendered as "सुन", i.e. the vowel sign u "ु" is combined with the
letter sa "स", but PDFBox combines it with the subsequent letter na "न" as
"सनु".
The cause is that it determines the letter to combine the diacritic with by its
origin which here indeed is in the range of the latter letter na "न", but as
the vowel sign glyph is rendered before its origin (it is drawn in an area with
a negative x coordinate), PDFBox determines the wrong association.
{quote}
Also see SA-U-NA.png, screen shots of the glyph coordinate ranges.
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