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  1. PDFBox
  2. PDFBOX-4508

Unexpected slowness filling forms with CJK

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      As reported by William Pietri in the users mailing list:

      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.

      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).

      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");
              long end = System.currentTimeMillis();
              System.out.println("Filled " + textField.getFullyQualifiedName() + " in " + (end - start) + "ms");
              start = end;
      doc.save(new File("i-130-filled.pdf"));


        1. NotoSansCJKsc-Medium.ttf
          18.95 MB
          Tilman Hausherr
        2. i-130.pdf
          1.75 MB
          Tilman Hausherr



            • Assignee:
              tilman Tilman Hausherr
              tilman Tilman Hausherr


              • Created:

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