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https://issues.apache.org/jira/browse/PDFBOX-3293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15232679#comment-15232679
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John Hewson edited comment on PDFBOX-3293 at 4/8/16 6:36 PM:
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No, FontBox does not support hinting, because that would require us to
implement the TrueType virtual machine, which would be an awful lot of work. So
I don't think that's going to happen, especially as it shouldn't be necessary
when dealing with "good" fonts.
But it would be disappointing for PDFBox to be unable to render your files,
especially given that Acrobat and many other readers can do so. Perhaps we
should look at other approaches - for example, going back to using AWT to
render certain fonts (AWT in general has proven to be buggy and not reliable
for rendering all fonts, especially PostScript fonts - but it does much better
with TTF). That's not a trivial change to make but it's at least more
achievable than implementing hinting in FontBox.
One other thought: maybe there's a minimal subset of hinting instructions which
we can implement to handle these fonts specifically? As they're essentially
already a special case. I don't know enough about TrueType hinting to know if
that's feasible or not.
WDYT?
was (Author: jahewson):
No, FontBox does not support hinting, because that would require us to
implement the TrueType virtual machine, which would be an awful lot of work. So
I don't think that's going to happen, especially as it shouldn't be necessary
when dealing with "good" fonts.
But it would be disappointing for PDFBox to be unable to render your files,
especially given that Acrobat and many other readers can do so. Perhaps we
should look at other approaches - for example, going back to using AWT to
render certain fonts (AWT in general has proven to be buggy and not reliable
for rendering all fonts, especially PostScript fonts - but it does much better
with TTF). That's not a trivial change to make but it's at least more
achievable than implementing hinting in FontBox.
One other thought: maybe there's a minimal subset of hinting instructions which
we can implement to handle these fonts specifically? As they're essentially
already a special case.
WDYT?
> Font glyphs with overlapping paths not rendered correctly
> ---------------------------------------------------------
>
> Key: PDFBOX-3293
> URL: https://issues.apache.org/jira/browse/PDFBOX-3293
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox, Rendering
> Affects Versions: 2.0.0
> Reporter: Pei-Tang Huang
> Attachments: PDFBOX-3293.ttf, PDFBOX-3293_reduced.pdf, fontforge.png,
> glyf.png, hinted.png, sample.pdf, sample_rendered.tif, unhinted.png
>
>
> Font glyphs with overlapping paths may be rendered in correctly, especially
> when the font size is small.
> Sadly, the Traditional Chinese edition of Windows bundled fonts 細明體&新細明體
> (MingLiU & PMingLiU) and 標楷體 (DFKai-SB) all suffer from this problem.
> See attached sample.pdf and the rendered sample_rendered.tif.
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