[jira] [Updated] (FOP-1777) Support for Font Kerning is Broken

["Thanasis Giannimaras (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FOP-1777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thanasis Giannimaras updated FOP-1777:
--------------------------------------
    Attachment: kerningTrunk.pdf
                kerningTrunk.patch
                fop.xconf
                bchr.README
                bchr.pfb
                bchr.afm

> Support for Font Kerning is Broken
> ----------------------------------
>
>                 Key: FOP-1777
>                 URL: https://issues.apache.org/jira/browse/FOP-1777
>             Project: FOP
>          Issue Type: Bug
>          Components: font/unqualified
>    Affects Versions: trunk
>         Environment: Operating System: All
> Platform: All
>            Reporter: Vincent Hennebert
>         Attachments: bchr.README, bchr.afm, bchr.pfb, fop.xconf, kerning.fo, kerning.pdf, kerningTrunk.patch, kerningTrunk.pdf, screenshot-openoffice-writer.png
>
>
> The method o.a.f.fonts.Font.getKernValue expects two Unicode code points and returns the amount of kerning between the two corresponding glyphs. However, the implementation for Type 1 fonts interprets the two integers as character codes in the font's internal encoding (see o.a.f.fonts.type1.AFMFile.java). Those usually have nothing to do with Unicode code points.
> Moreover, trying to get kerning between two characters is inherently wrong: kerning applies to glyphs and not characters. A font may have several glyph variants for a same character, and kerning is likely to be different for each variant.



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