Fabrice Calafat created PDFBOX-6279:
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Summary: Missing ToUnicode entries for glyphs produced by GSUB
substitutions
Key: PDFBOX-6279
URL: https://issues.apache.org/jira/browse/PDFBOX-6279
Project: PDFBox
Issue Type: Bug
Components: PDModel
Affects Versions: 3.0.8 PDFBox
Reporter: Fabrice Calafat
Attachments: CormorantInfant-Medium.ttf
When text is written with showText() and the font has GSUB ligatures, the
ligature glyph has no cmap entry, so PDCIDFontType2Embedder writes no ToUnicode
entry for it. Copy-paste and text extraction then lose those letters.
For example, with a script font that has "er" and "nd" ligatures, "Registered"
is extracted as "Registed" and "Brandenstein" as "Braenstein". The rendering is
correct.
The same happens with Devanagari conjuncts and with letters followed by a
combining accent.
*Solution:*
When a glyph has no cmap entry, use the GSUB table to find the glyphs it
replaces and write their text in the ToUnicode map.
*Testing:*
Unit tests added using Lohit-Devanagari.ttf and the IPA Gothic font
(ipag.ttf) that is already downloaded for the tests. I've also attached
CormorantInfant-Medium.ttf (OFL, cut down to ASCII), which has Latin ligatures
("Th", "ft", "gg") with no cmap entry, if you want a Latin ligature test.
*Related:*
PDFBOX-5599 (comment about "ti" not being extracted correctly with Calibri)
PDFBOX-5875 (same idea, on the text extraction side)
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