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https://issues.apache.org/jira/browse/PDFBOX-4508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16811761#comment-16811761
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Tilman Hausherr commented on PDFBOX-4508:
-----------------------------------------
The trick with the COSObject doesn't work (build tests fail). The reason is
that now identical objects are added twice or more. I'll do nothing further,
I'll improve the javadoc and will mention it in the two SO issues that explain
how to change fonts.
> Unexpected slowness filling forms with CJK
> ------------------------------------------
>
> Key: PDFBOX-4508
> URL: https://issues.apache.org/jira/browse/PDFBOX-4508
> Project: PDFBox
> Issue Type: Improvement
> Components: AcroForm
> Affects Versions: 2.0.14
> Reporter: Tilman Hausherr
> Priority: Major
> Labels: Optimization
> Attachments: NotoSansCJKsc-Medium.ttf, i-130.pdf
>
>
> As reported by William Pietri in the users mailing list:
> {quote}If I go through this and fill every field with roman text using the
> default font, it takes circa 2 seconds, which is fine. If I fill it with an
> added Arabic font, it takes circa 7 seconds. And if I use a CJK font, it
> takes circa 140 seconds, which seems like a lot. This is with PDFBox 2.0.14
> and the Oracle 1.8.201 JDK on Linux.
> {quote}
> And the message "OpenType Layout tables used in font NotoSansCJKsc-Medium are
> not implemented in PDFBox and will be ignored " comes up for every field,
> which suggests that the font is opened each time.
> I can confirm this, also with a different font (ArialUni).
> {code:java}
> PDDocument doc = PDDocument.load(new File("i-130.pdf"));
> PDResources res =
> doc.getDocumentCatalog().getAcroForm().getDefaultResources();
> PDFont font = PDType0Font.load(doc, new FileInputStream(new
> File("NotoSansCJKsc-Medium.ttf")), false);
> String fontName = res.add(font).getName();
> long start = System.currentTimeMillis();
> for (Iterator<PDField> it =
> doc.getDocumentCatalog().getAcroForm().getFieldIterator(); it.hasNext();)
> {
> PDField field = it.next();
> if (field instanceof PDTextField)
> {
> PDTextField textField = (PDTextField) field;
> textField.setDefaultAppearance("/" + fontName + " 0 Tf 0 g");
> textField.setValue("中国");
> long end = System.currentTimeMillis();
> System.out.println("Filled " + textField.getFullyQualifiedName() + "
> in " + (end - start) + "ms");
> start = end;
> }
> }
> doc.save(new File("i-130-filled.pdf"));
> {code}
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