[jira] [Commented] (PDFBOX-2563) [PATCH] Use cmap for Type0/TTF fallback

["John Hewson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-2563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14244998#comment-14244998 ] 

John Hewson commented on PDFBOX-2563:
-------------------------------------

We need a generic way to find substitute fonts, rather than hardcoding them. We only hardcoded the standard 14 fonts and use heuristics to find all other missing fonts.

There's a problem with trying to find substitutes using the Unicode characters, due to [Han unification|http://www.unicode.org/faq/han_cjk.html], where the same glyph might look very different in Japanese vs Korean vs Chinese.

TTF fonts don't explicitly label the languages which they contain. One idea I could suggest it to sniff the languages in the 'name' table, which is the only place in a TTF which is language-specific. We need to categorise each font on disk C, J, or K, or none. I'd be interested to know how Evince is doing this.

> [PATCH] Use cmap for Type0/TTF fallback
> ---------------------------------------
>
>                 Key: PDFBOX-2563
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2563
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.0
>            Reporter: simon steiner
>            Assignee: John Hewson
>             Fix For: 2.0.0
>
>         Attachments: VariousKFontsNotembeded218.PDF, ttfcmapfallback.patch
>
>
> java -jar ~/pdf-box-svn/app/target/pdfbox-app-2.0.0-SNAPSHOT.jar PDFToImage VariousKFontsNotembeded218.PDF
> This patch addresses some of the issues in PDFBOX-2509.



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