Printing a pixmap full page: strange behavior on Windows

[Pieter from Belgium]

In my application I print a pixmap, full page. Under Linux this works fine, but on Windows, only part of the pixmap is printed, with a high zoom-in level.

In attachment, both pdfs.

The printing code fragment:

QPixmap pixmapToPrint = window->GetImageGraphicsView()->PaintToPixmap();
QPainter painter(GetPrinter());
QSize size = pixmapToPrint->size();
QRect viewport = painter.viewport();
 
   qDebug() << "pixmap size: " << size;   // output: QSize(382,393)
   qDebug() << "painter viewport: " << viewport;  // output: QRect(0,0 4958x7016)
 
size.scale(viewport.size(), Qt::KeepAspectRatio); 
painter.setViewport(viewport.x(),viewport.y(),size.width(),size.height());
painter.setWindow(pixmapToPrint->rect());
 
   qDebug() << "corrected painter viewport: " << painter.viewport();  // output: QRect(0,0 4958x5100)
   qDebug() << "corrected painter window: " << painter.window();  // output: QRect(0,0 382x393)
 
painter.drawPixmap(0,0,*pixmapToPrint);

QPixmap pixmapToPrint = window->GetImageGraphicsView()->PaintToPixmap();
QPainter painter(GetPrinter());
QSize size = pixmapToPrint->size();
QRect viewport = painter.viewport();

   qDebug() << "pixmap size: " << size;   // output: QSize(382,393)
   qDebug() << "painter viewport: " << viewport;  // output: QRect(0,0 4958x7016)

size.scale(viewport.size(), Qt::KeepAspectRatio); 
painter.setViewport(viewport.x(),viewport.y(),size.width(),size.height());
painter.setWindow(pixmapToPrint->rect());

   qDebug() << "corrected painter viewport: " << painter.viewport();  // output: QRect(0,0 4958x5100)
   qDebug() << "corrected painter window: " << painter.window();  // output: QRect(0,0 382x393)

painter.drawPixmap(0,0,*pixmapToPrint);

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