Dan Caprioara created FOP-2701:
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Summary: Some of the latin ligatures make text not searchable in
PDF
Key: FOP-2701
URL: https://issues.apache.org/jira/browse/FOP-2701
Project: FOP
Issue Type: Bug
Components: font/opentype
Affects Versions: 2.1
Environment: Windows 10, Calibri font.
Reporter: Dan Caprioara
Attachments: latn-ligatures-Antenna-House.pdf, latn-ligatures-FOP.pdf
This problem happens using the Calibri font, that is packed in the MS Office
suite and Windows 10.
I tested with the following text: {{file settings}}.
The resulted PDF text contains ligatures: {{(fi)le se(tti)ngs}}
Searching for {{file}} in Acrobat Reader results in the first word being
selected. This is Ok. But searching for {{set}}, or {{settings}} gives no
results.
The same example, run with Antenna House works fine, you get results when
searching for {{settings}}.
Here is the complete FO file:
{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format";>
<fo:layout-master-set>
<fo:simple-page-master master-name="a">
<fo:region-body/>
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="a">
<fo:flow flow-name="xsl-region-body">
<fo:block font-family="Calibri" font-size="40pt">file
settings</fo:block>
</fo:flow>
</fo:page-sequence>
</fo:root>
{code}
Some considerations:
# A workaround would be to reject all the substitutions that are not part of
org.apache.fop.fonts.type1.AdobeStandardEncoding. This would leave the (fi)
ligature, but reject the (tti) one. But this seems to work only for Calibri and
not for Roboto!!
# I think there might be some issues with the font embedding, and some
substitution mapping data is lost. It is just a guess, I am not sure how PDF
deals with substitutions.
I know that setting in FO xml:lang to "en" disables the ligatures, but is not a
solution for my project. I would appreciate any suggestions.
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