Cannot add Raleway font with Unicode encoding

[aleksvidak]

Describe the bug

I am trying to add Regular and Bold variants of https://fonts.google.com/specimen/Raleway font. Not directly through the this library, but by using FlyingSaucer. I think though, it might be an issue with LibrePDF.

I get exception:

java.lang.ArrayIndexOutOfBoundsException: Index 4100 out of bounds for length 1068
	at com.lowagie.text.pdf.TrueTypeFontSubSet.checkGlyphComposite(TrueTypeFontSubSet.java:365)
	at com.lowagie.text.pdf.TrueTypeFontSubSet.flatGlyphs(TrueTypeFontSubSet.java:360)
	at com.lowagie.text.pdf.TrueTypeFontSubSet.process(TrueTypeFontSubSet.java:148)
	at com.lowagie.text.pdf.TrueTypeFontUnicode.writeFont(TrueTypeFontUnicode.java:478)
	at com.lowagie.text.pdf.FontDetails.writeFont(FontDetails.java:410)
	at com.lowagie.text.pdf.PdfWriter.addSharedObjectsToBody(PdfWriter.java:1333)
	at com.lowagie.text.pdf.PdfWriter.close(PdfWriter.java:1266)
	at com.lowagie.text.pdf.PdfDocument.close(PdfDocument.java:851)
	at com.lowagie.text.Document.close(Document.java:535)
	at org.xhtmlrenderer.pdf.ITextRenderer.createPDF(ITextRenderer.java:406)
	at org.xhtmlrenderer.pdf.ITextRenderer.createPDF(ITextRenderer.java:326)
	at internal.project.package.PdfRenderer.renderPdf(PdfRenderer.java:45)

To Reproduce

Code to reproduce the issue

public class Test {
  public static void main(String[] args) {

    System.out.println("True Types (embedded)");

    // step 1: creation of a document-object
    Document document = new Document();

    try {

      // step 2: creation of the writer-object
      PdfWriter.getInstance(document, new FileOutputStream("unicode.pdf"));

      // step 3: we open the document
      document.open();

      // step 4: we add content to the document
      Font font =
          FontFactory.getFont(
              "fonts/Raleway-Regular.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED, 12);
      String text1 = "This is the quite popular True Type font 'Raleway'.";
      document.add(new Paragraph(text1, font));
    } catch (DocumentException | IOException de) {
      System.err.println(de.getMessage());
    }

    // step 5: we close the document
    document.close();
  }
}

Original code with Flyingsaucer:

@Service
@Slf4j
public class PdfRenderer {

  private static final List<String> FONTS =
      List.of("fonts/Raleway-Regular.ttf", "fonts/Raleway-Bold.ttf");

  private final TemplateEngine templateEngine;

  public PdfRenderer(TemplateEngine templateEngine) {
    ClassLoaderTemplateResolver resolver = new ClassLoaderTemplateResolver();
    resolver.setPrefix("templates/");
    resolver.setSuffix(".html");
    resolver.setTemplateMode(TemplateMode.HTML);

    templateEngine.setTemplateResolver(resolver);

    this.templateEngine = templateEngine;
  }

  public byte[] renderPdf(String templateName, Context context) {
    try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
      ITextRenderer renderer = new ITextRenderer();

      for (String font : FONTS) {
        renderer.getFontResolver().addFont(font, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
      }

      renderer.setDocumentFromString(templateEngine.process(templateName, context));
      renderer.layout();
      renderer.createPDF(outputStream);
      return outputStream.toByteArray();
    } catch (Exception e) {
      e.printStackTrace();
      throw new PdfGenerationException("Error generating PDF", e);
    }
  }
}

Expected behavior

I would expect that Fonts are loaded and rendered. Trying test given above with direct usage of LibrePDF lib, it yields empty pdf. If I try another font, e.g. https://fonts.google.com/noto/specimen/Noto+Sans, it works.

System

• OS: MacOS
• Used font: https://fonts.google.com/specimen/Raleway
• OpenPDF version: 2.0.3
• Flyingsaucer version: 9.11.4