Custom fonts don't work within an SVG

[clyde-gustafson]

Describe the bug I have an SVG string that has a custom font. I've tested the font on text and it works. I've added the font to the document fonts, but it still doesn't render the SVG properly.

To Reproduce Code snippet to reproduce the behavior: Here's my svg: https://pastebin.com/dzw0yqbd (Had to put it in a pastebin because it was too long)

The font is here: https://github.com/grame-cncm/guidolib/blob/dev/src/guido2.ttf

Here's my code:

   Future<void> exportPdf(String desiredPath) async {
    int pageCount = 1

    final pdf = pw.Document();
    final Uint8List fontData = await File('assets/external-libraries/guido2.ttf').readAsBytes();

    PdfTtfFont font = PdfTtfFont(pdf.document, fontData.buffer.asByteData());

    pdf.document.fonts.add(font);

    for (int i = 1; i <= pageCount; i++) {
      String svgImage = await File('assets/samples/basic.svg').readAsString();

      pdf.addPage(pw.Page(build: (pw.Context context) {
        return pw.Center(
          child: pw.SvgImage(
            svg: svgImage,
          ),
        ); // Center
      }));
    }

    final file = File('$desiredPath.pdf');
    await file.writeAsBytes(await pdf.save());
  }

Expected behavior The font is valid, because when I try to just use the font in text it works fine. But when I try to use the font within an svg this is what shows up:

Here's the text example:

This is generated using this code:

     pdf.addPage(pw.Page(build: (pw.Context context) {
        return pw.Center(
          child: pw.Text('W', style: pw.TextStyle(font: ttf, fontSize: 100))
        ); // Center
      }));

Flutter Doctor

[√] Flutter (Channel stable, 3.19.3, on Microsoft Windows [Version 10.0.22631.4037], locale en-US)
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[√] Connected device (3 available)
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! Doctor found issues in 1 category.

Desktop (please complete the following information):

• [ ] iOS
• [ ] Android
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• [ ] Linux

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