Tobias Fischer created PDFBOX-3757:
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Summary: TTFSubsetter scrambles PostScript names and unicode
codepoints when subset contains diaeresis
Key: PDFBOX-3757
URL: https://issues.apache.org/jira/browse/PDFBOX-3757
Project: PDFBox
Issue Type: Bug
Components: FontBox
Affects Versions: 2.0.5
Reporter: Tobias Fischer
Attachments: fontbox-2.0.5-ttfsubsetter_dieresis-scrambled-names.png,
fontbox-2.0.5-ttfsubsetter_scrambled-codepoints.png,
Subset-DejaVuSans__dieresis-scrambled-names.ttf,
Subset-DejaVuSans__scrambled-codepoints.ttf
I tried to build a standalone FontSubsetter with the great fontbox tools. It
works so far for OpenType/TrueType fonts, but when the glyph subset contains
characters with diaeresis (like german umlauts äöü), the TTFSubsetter class
scrambles PostScript names and unicode codepoints.
When creating a subset from DejaVuSans.ttf for example, with only those two
characters "Ö " (O umlaut and a hair space \u200A), the resulting font subset
is recognized as a valid font, but the unicode codepoint 200A in the resulting
font file has the postscript name "Dieresis" and the single dieresis are named
"uni200A". See screenshot
"fontbox-2.0.5-ttfsubsetter_dieresis-scrambled-names.png" and the subsetted
Font "Subset-DejaVuSans__dieresis-scrambled-names.ttf".
When there are more glyphs in the subset, more whitespace, special chars and
umlauts, the scrambling goes even further and also scrambles unicode codepoints
and not only postscript names:
glyphs in subset: "RabenköigKrmloEyGfthsTjHdAu cvFüD. w,äUp:IzWVZSN-ßLC
PB5M«»O2013Q©/;x978-()64XJ'!Ä?‹› ...ÜqY &Öé|_•{}[]>#*$^\\+"
Resulting font: "Subset-DejaVuSans__scrambled-codepoints.ttf"
Screenshot: "fontbox-2.0.5-ttfsubsetter_scrambled-codepoints.png"
I considder this a bug, as it does not appear when there are no umlauts or
diaeresis in the subset.
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