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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[wysota]

Does GetPrinter() include setting up the printer?

[Pieter from Belgium]

GetPrinter() returns an instance variable created when first needed using

mpPrinter = new QPrinter(QPrinter::PrinterResolution);

mpPrinter = new QPrinter(QPrinter::PrinterResolution);

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And configurated using a QPrintDialog:

QPrintDialog setupPrinterDialog(GetPrinter(),this);
 if (setupPrinterDialog.exec())
{
   [I]<<here the code mentioned earlier>>[/I]
}

QPrintDialog setupPrinterDialog(GetPrinter(),this);
 if (setupPrinterDialog.exec())
{
   [I]<<here the code mentioned earlier>>[/I]
}

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[matthy]

I've got the same problem. Thought it relied on the printer. Hope now that anybody could help me.

[wysota]

Are you sure this is correct?

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

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

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It shouldn't even compile...

[Pieter from Belgium]

I'm sorry. I distilled the code fragment from the actual code, leaving out irrelevant elements, and changed a pointer to a pixmap into a pixmap, but not in a consequent manner.

Should have been:

painter.drawPixmap(0,0,pixmapToPrint);

painter.drawPixmap(0,0,pixmapToPrint);

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[matthy]

My Code is similar to the code in the Image Viewer example:
QPrinter *printer = new QPrinter(QPrinter::HighResolution);
QPrintDialog dialog(printer, this);

printer->setOrientation(QPrinter::Landscape);

if (dialog.exec()) {
QPainter painter(printer);
QRect rect = painter.viewport();
QSize size = diagram->imageLabel->pixmap()->size();

size.scale(rect.size(), Qt::KeepAspectRatio);
painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
painter.setWindow(diagram->imageLabel->pixmap()->rect());
painter.drawPixmap(0, 0, *diagram->imageLabel->pixmap());
}

I have to say, that the Imageviewer example has the same problem after I installed QT4.3.0. With QT 4.1.1 the example and my code worked.

[matthy]

After installation of the new Qt version 4.3.2 it worked again.

[Pieter from Belgium]

Some time ago I've found what the problem is:
I used the deprecated QPrinter::PrinterResolution printer mode, which has been documented to behave in a non-portable way. I've changed it to QPrinter::HighResolution and everything works fine.

Thanks for your ideas.