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https://issues.apache.org/jira/browse/PDFBOX-3150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15038502#comment-15038502
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Tilman Hausherr commented on PDFBOX-3150:
-----------------------------------------
I agree with this - creating a PDF with a falback codepoint brings the risk
that the error isn't discovered. Especially with "\n" - users must understand
early that PDF doesn't understand newlines.
> IllegalArgumentException in getStringWidth/showText
> ---------------------------------------------------
>
> Key: PDFBOX-3150
> URL: https://issues.apache.org/jira/browse/PDFBOX-3150
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.0
> Environment: 2.0.0-RC2
> Reporter: Philip Helger
> Assignee: John Hewson
>
> I want to get the string width using a Type0 font. Because I'm using a
> character not in the font (e.g. '\n') I'm getting the following exception:
> {code}
> Exception in thread "main" java.lang.IllegalArgumentException: No glyph for
> U+000A in font OpenSans
> at
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2.encode(PDCIDFontType2.java:401)
> at
> org.apache.pdfbox.pdmodel.font.PDType0Font.encode(PDType0Font.java:351)
> at org.apache.pdfbox.pdmodel.font.PDFont.encode(PDFont.java:283)
> at org.apache.pdfbox.pdmodel.font.PDFont.getStringWidth(PDFont.java:312)
> {code}
> As this is a quite common scenario, I suggest you provide a possibility to
> provide a fallback codepoint that can be used for all non-printable
> characters.
> A similiar exception happens when trying to print the text via the
> PDPageContentStream:
> {code}
> Exception in thread "main" java.lang.IllegalArgumentException: No glyph for
> U+000A in font OpenSans
> at
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2.encode(PDCIDFontType2.java:401)
> at
> org.apache.pdfbox.pdmodel.font.PDType0Font.encode(PDType0Font.java:351)
> at org.apache.pdfbox.pdmodel.font.PDFont.encode(PDFont.java:283)
> at
> org.apache.pdfbox.pdmodel.PDPageContentStream.showText(PDPageContentStream.java:341)
> {code}
> I finally ended up creating my own "font.encode" method (with a lot of other
> hacks) that basically does the following:
> {code}
> final byte [] aFallbackBytes = aFont.encode (nFallbackCodepoint);
> byte [] aCPBytes;
> try
> {
> // This method is package private
> aCPBytes = aFont.encode (nCP);
> }
> catch (final IllegalArgumentException ex) {
> aCPBytes = aFallbackBytes;
> }
> {code}
> -> another issue is, that "PDFont.encode (int)" is not public - it would help
> to change this as well. Shall I create a separate issue?
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