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https://issues.apache.org/jira/browse/PDFBOX-5704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17809113#comment-17809113
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Andreas Lehmkühler commented on PDFBOX-5704:
--------------------------------------------

Mike Li mentioned the pdf.js implementation on dev@. Their parser tries to 
detect the embedded font type by reading the font itself and applies a fix if 
the font type of the font doesn't match with the type from the dictionary.

I've added a fix for CID fonts inspired by that implementation and now the 
attached pdf renders as expected.

[~tilman] please run your rendering test to see if there are some issues, 
thanks in advance

> char not rendered
> -----------------
>
>                 Key: PDFBOX-5704
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5704
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.29, 3.0.0 PDFBox
>            Reporter: sunnyawake
>            Assignee: Andreas Lehmkühler
>            Priority: Major
>             Fix For: 4.0.0
>
>         Attachments: 1.pdf
>
>
> the red char in the attached pdf can't be rendered.
> after debug pdfjs(which renders the char correctly), the font the char uses 
> is a cff font,not PDCIDFontType2



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