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https://issues.apache.org/jira/browse/PDFBOX-4793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17051977#comment-17051977
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Tilman Hausherr commented on PDFBOX-4793:
-----------------------------------------
You could try deleting the cache file but I expect this to stay as it is... the
weird thing is I have MalgunGothic Semilight too on my machine and it isn't
chosen.
But wait, it gets weirder...
I looked into my developing code of {{getFontMatches()}} and found this:
{code}
// Idee: ausschluss mapping
//System.out.println("fontDescriptor.getFontName(): " +
fontDescriptor.getFontName() + ", info.getPostScriptName(): " +
info.getPostScriptName());
// https://github.com/mozilla/pdf.js/issues/10699
// fontDescriptor.getFontName(): AdobeSongStd-Light,
info.getPostScriptName(): MalgunGothic-Semilight
//if (info.getPostScriptName().startsWith("MalgunGothic"))
//{
// continue;
//}
{code}
I also had a look at the score values. For your file all scores are 0. So it's
just bad luck that Malgun was chosen:
getFontMatches: AdobeSongStd-Light
ArialUnicodeMS (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\ARIALUNI.TTF 0.0
MalgunGothic-Semilight (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\malgunsl.ttf 0.0
MalgunGothic-Semilight (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\malgunsl.ttf 0.0
MicrosoftYaHei (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyh.ttc 0.0
MicrosoftYaHeiUI (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyh.ttc 0.0
MicrosoftYaHei-Bold (TTF, mac: 0x1, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhbd.ttc 0.0
MicrosoftYaHei-Bold (TTF, mac: 0x1, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhbd.ttc 0.0
MicrosoftYaHeiUI-Bold (TTF, mac: 0x1, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhbd.ttc 0.0
MicrosoftYaHeiUI-Bold (TTF, mac: 0x1, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhbd.ttc 0.0
MicrosoftYaHeiLight (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhl.ttc 0.0
MicrosoftYaHeiUILight (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhl.ttc 0.0
SimSun (TTF, mac: 0x0, os/2: 0x0, cid: null) C:\WINDOWS\FONTS\simsun.ttc 0.0
NSimSun (TTF, mac: 0x0, os/2: 0x0, cid: null) C:\WINDOWS\FONTS\simsun.ttc 0.0
SimSun-ExtB (TTF, mac: 0x0, os/2: 0x0, cid: null) C:\WINDOWS\FONTS\simsunb.ttf
0.0
SimSun-ExtB (TTF, mac: 0x0, os/2: 0x0, cid: null) C:\WINDOWS\FONTS\simsunb.ttf
0.0
Then I did the same for the file from PDF.js mentioned in the comment. There it
looks like this:
getFontMatches: AdobeSongStd-Light
MalgunGothic-Semilight (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\malgunsl.ttf 1.0
MicrosoftYaHeiLight (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhl.ttc 0.9499999992549419
MalgunGothic-Semilight (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\malgunsl.ttf 1.0
MicrosoftYaHei (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyh.ttc 0.5
MicrosoftYaHeiUILight (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhl.ttc 0.9499999992549419
SimSun (TTF, mac: 0x0, os/2: 0x0, cid: null) C:\WINDOWS\FONTS\simsun.ttc 0.5
SimSun-ExtB (TTF, mac: 0x0, os/2: 0x0, cid: null) C:\WINDOWS\FONTS\simsunb.ttf
0.5
MicrosoftYaHeiUI-Bold (TTF, mac: 0x1, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhbd.ttc -1.0
MicrosoftYaHeiUI-Bold (TTF, mac: 0x1, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhbd.ttc -1.0
MicrosoftYaHeiUI (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyh.ttc 0.5
ArialUnicodeMS (TTF, mac: 0x0, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\ARIALUNI.TTF 0.5
MicrosoftYaHei-Bold (TTF, mac: 0x1, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhbd.ttc -1.0
NSimSun (TTF, mac: 0x0, os/2: 0x0, cid: null) C:\WINDOWS\FONTS\simsun.ttc 0.5
MicrosoftYaHei-Bold (TTF, mac: 0x1, os/2: 0x805, cid: null)
C:\WINDOWS\FONTS\msyhbd.ttc -1.0
SimSun-ExtB (TTF, mac: 0x0, os/2: 0x0, cid: null) C:\WINDOWS\FONTS\simsunb.ttf
0.5
> Questionable fallback font for some embedded chinese fonts
> ----------------------------------------------------------
>
> Key: PDFBOX-4793
> URL: https://issues.apache.org/jira/browse/PDFBOX-4793
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.18
> Reporter: Christian Appl
> Priority: Major
> Attachments: image-2020-03-04-09-49-42-323.png,
> image-2020-03-04-09-58-01-055.png, image-2020-03-04-10-09-25-343.png,
> image-2020-03-04-10-31-03-065.png, pdf_font-zhcn.pdf, screenshot-2.png,
> screenshot-3.png, screenshot-4.png, screenshot-5.png, screenshot-6.png
>
>
> *Issue:*
> I tried to render PDFs, that contain embedded chinese fonts. Neither the PDF
> Debugger, nor printouts of the document (PDFPrintable), nor the PDFRenderer
> can display/render the chinese glyphs correctly and will render placeholders
> instead.
> *Assumptions:*
> I assume, that said embedded fonts are incomplete and don't contain all
> glyphs, that would be required to render the text properly and therefore
> PDFbox attempts to use the previously determined fallback font. (!?)
> !image-2020-03-04-09-49-42-323.png!
> !image-2020-03-04-09-58-01-055.png!
> And fails to find the glyphs in said fallback font.
> Which is not surprising, as the Fallback font "MalgunGothic-Semilight"
> (Windows standard font) does not contain chinese characters.
> !image-2020-03-04-10-09-25-343.png!
> *Debugging:*
> I tried to understand how the fallback font is determined and what could be
> done to solve this problem on my end. But I was unable to find a satisfying
> solution.
> My best guess so far is, that the CIDFontMapping (FontMapperImpl) is to blame
> for determining an unfit fallback font.
> Although it seems to check, whether required codepages are contained in a
> fallback font, it still does rank the Malgun font as the topscorer and best
> substitute font, even though it does clearly not contain all required
> codepages.
> *My opinion:*
> This is troubling, as better fit fonts exist and could have been selected.
> (ie.: Adobe Stong Std) And are indeed included in the CIDFontMapping, but
> seemingly are scoring lower for some reason.
> *Further information:*
> I can not disclose the document in question, however I found a document
> (pdf_font-zhcn.pdf) in another issue (PDFBOX-3132), that can be used to
> reproduce the issue (ie.: by dropping it into the PDF Debugger)
> !image-2020-03-04-10-31-03-065.png!
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