John Hewson commented on PDFBOX-3293:

I found a good [blog 
 on CJK fonts which use hints to position brush strokes.

> Chinese 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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