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Fix bugtracker #340: small PDF text drawn too bold in Adobe Acrobat

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Qt 6 declares the PDF/X namespace (pdfxid) in the XMP metadata of every
PDF it writes, even when the file is not PDF/X. Adobe Acrobat then draws
small text too bold at some zoom levels. Qt only needs the declaration
for PDF/X-4 output, which QElectroTech never asks for.

Blank the declaration out after export, in place with spaces so no
offsets move, in both the export window and the --export-pdf path.
Diagnosis and the Acrobat testing by Alf, bugtracker #340.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G2d2Zi8BfrYRPX88zhaoFG
This commit is contained in:
ispyisail
2026-09-25 20:44:02 +12:00
parent 8aefdcc481
commit 4f309770f0
4 changed files with 34 additions and 0 deletions
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sources/pdf_links.cpp
+23
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@@ -388,6 +388,29 @@ void convertUriToGoTo(const QString &pdfPath)
out.close();
}
void removeUnusedPdfxNamespace(const QString &pdfPath)
{
QFile f(pdfPath);
if (!f.open(QIODevice::ReadOnly)) return;
QByteArray data = f.readAll();
f.close();
// Qt only fills the pdfxid namespace in when it writes PDF/X-4.
if (data.contains("pdfxid:GTS_PDFXVersion")) return;
static const QByteArray decl =
" xmlns:pdfxid=\"http://www.npes.org/pdfx/ns/id/\"";
const int pos = data.indexOf(decl);
if (pos == -1) return;
// Same length, so the stream /Length and the xref offsets stay valid.
data.replace(pos, decl.size(), QByteArray(decl.size(), ' '));
if (!f.open(QIODevice::WriteOnly | QIODevice::Truncate)) return;
f.write(data);
f.close();
}
void convertComponentInfoAnnotations(const QString &pdfPath,
const QList<ComponentInfo> &annotations)
{