Robert Amidon created PDFBOX-5905:
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Summary: Many ZapfDingbats symbols do not appear when page is
rendered.
Key: PDFBOX-5905
URL: https://issues.apache.org/jira/browse/PDFBOX-5905
Project: PDFBox
Issue Type: Bug
Affects Versions: 3.0.3 PDFBox, 2.0.32
Environment: Ubuntu 22.04
Reporter: Robert Amidon
Attachments: missing_symbols.png
We've encountered some PDFs that have characters written using the ZapfDingbats
symbol font. On Windows PdfBox recreates the symbols appropriately, but when
testing on Ubuntu 22.04 we've noticed that many symbols, such as the heavy
checkmark (U+2714) are missing. Instead an empty character is produced.
Upon debugging it appears that the PdfBox toolkit substitutes the ZapfDingbats
font for some other font instead. In our observation, the code attempts to
fallback to "Helvetica," but because this font is not present the last-resort
"LiberationSans" is selected instead. This font is not capable of displaying
the heavy checkmark symbol (a20/U+2714) and hence it is missing when the PDF
page is rendered to an image. The following appears in the Debug console:
{quote}
WARNING: Using fallback font LiberationSans for ZapfDingbats
{quote}
While debugging, if we inject the font name "DejaVuSans" into the variable for
"fallbackName" in the {{FontMapperImpl::getFontBoxFont(String,
PDFontDescriptor)}} method, then DejaVuSans is instead resolved as the base
font and the heavy checkmark symbol (and others) is drawn correctly.
It's not clear to us why a more appropriate font is not chosen in this
instance. It results in many ZapfDingbats symbols missing when the page is
rendered.
[This PDF
file|https://www.w3.org/Style/XSL/TestSuite/contrib/XEP/Tests/zapf-dingbats.pdf]
demonstrates the problem.
h2. Steps to Reproduce:
# Create a Java project and import PdfBox v2.0.32
# Execute the below code snippet, substituting the placeholder file paths for
real ones on your system, on Ubuntu 22.04
# Observe that the image file that is produced is missing many symbols.
{code}
String inputPath = "zapf-dingbats.pdf";
File pdfFile = new File(inputPath);
try (PDDocument pdfDoc = PDDocument.load(pdfFile)) {
PDFRenderer renderer = new PDFRenderer(pdfDoc);
BufferedImage image = renderer.renderImage(0);
String outputPath = "zapf-dingbats.ubuntu.png";
try (OutputStream outFile = new FileOutputStream(outputPath)) {
ImageIOUtil.writeImage(image, "PNG", outFile);
}
}
catch (IOException e) {
e.printStackTrace();
}
{code}
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