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https://issues.apache.org/jira/browse/FOP-3045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17495458#comment-17495458
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Stefan Knorr commented on FOP-3045:
-----------------------------------
Ftr, I had tried to create a patch for the mappings a while ago. I am a
complete Java illiterate however, so the only thing I know is that it does not
work.
If it's useful nonetheless, feel free to modify the patch and incorporate it
under CC0 (i.e. I'd rather like to skip the copyright & CLA process).
https://github.com/openSUSE/suse-xsl/files/7179954/0001-Fix-detection-for-thin-extra-light-black-fonts.log
> Auto Detection does not work for Poppins
> ----------------------------------------
>
> Key: FOP-3045
> URL: https://issues.apache.org/jira/browse/FOP-3045
> Project: FOP
> Issue Type: Bug
> Components: font/opentype, renderer/pdf
> Affects Versions: 2.6
> Environment: openSUSE Leap 15.3
> fop 2.6
> google-poppins-fonts 4.003-6.3.1
> Reporter: Quang Tran
> Priority: Major
> Attachments: Font and Font weight mapping.png, fop.xconf, out.pdf,
> poppins.fo, poppins.pdf
>
>
> The attached reproducer XLST-FO (poppins.fo) has sample text with font
> weights from 100 - 900.
> Although the font-weights 300 and 100 are substituted with the font-weight
> 200 the following font-weight 400 is being rendered much thinner.
> Snippet from output:
> ...
> {{WARNING: Font "Poppins,normal,300" not found. Substituting with
> "Poppins,normal,200".}}
> {{Jan 05, 2022 3:00:31 PM org.apache.fop.apps.FOUserAgent processEvent}}
> {{WARNING: Font "Poppins,normal,100" not found. Substituting with
> "Poppins,normal,200".}}
> {{Jan 05, 2022 3:00:31 PM org.apache.fop.apps.FOUserAgent processEvent}}
> {{WARNING: Font "Poppins,normal,900" not found. Substituting with
> "Poppins,normal,800".}}
> (Also the normal italic seems to be wrong, too. I'm not sure if it's
> correlated to this issue or another.)
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