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https://issues.apache.org/jira/browse/PDFBOX-4508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16811797#comment-16811797
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ASF subversion and git services commented on PDFBOX-4508:
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Commit 1857074 from Tilman Hausherr in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1857074 ]
PDFBOX-4508: add comment
> 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, Documentation
> 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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