QPrinter & QPainter Font Differences Between LInux and WIndows

[tpf80]

I have a Qt 4.4.3 app that uses QPainter to draw to a PDF QPrinter. It works perfectly in linux, and in windows, however the font sizes are enlarged when the code runs on the windows version. How can I get the Windows and Linux PDF's to render fonts exactly the same size?

Heres the code that I used to create the PDF:

void PdfGenerate::generatePdf() {
 
	QString stufftowritetopdf;
 
	QPrinter printer; //create a printer
	setupLetterPoints(printer, "filename.pdf"); //set up reference points for our coordinate system
	QPainter painter(&printer); //make a painter, which uses this printer,
 
       ///////////////////////////////////////////
       /// in here draw some text
       /////////////////////////////////////////////
 
       stufftowritetopdf = "here we put a lot of text so that its long enough 
to force a word wrap. When this text is rendered in linux and windows, 
the resulting PDFs will have a different visable font size, even though the
 code and text is the same. If You put enough text here to fill up a page 
when compiled in linux, it will run off the bottom of the page in the windows
 compiled version due to the windows version using a larger font size.";
	totaldepth = totaldepth + drawrichtextinrect(&painter, leftmargin, totaldepth, horizmarginwidth, 0, stufftowritetopdf, normalsize);
 
       ///////////////////////////////////////////
       /// done drawing text
       /////////////////////////////////////////////
 
        printlastpage(painter); //end the final page:
}
 
//set up the point coordinates for a letter sheet of paper:
void PdfGenerate::setupLetterPoints(QPrinter& printer, QString filename) {
 
	printer.setOrientation(QPrinter::Portrait); //set theorientation of the paper
	printer.setOutputFormat(QPrinter::PdfFormat); //make that printer as a PDF
	printer.setOutputFileName(filename); //set the PDF file name
	printer.setPaperSize(QPrinter::Letter); //set paper size
	printer.setFullPage(false); //coordinates based on printable area
	printer.setPageMargins( 0.5, 0.5, 0.5, 0.5, QPrinter::Inch);
	printer.setResolution(72); //72 is standard
 
	//(72 points / inch)
	pagewidth = 540; //8.5 inch
	pageheight = 720; //11 inch
 
	margin = 0; // 0.5 inch margin
 
	topmargin = margin;
	bottommargin = pageheight - margin;
	leftmargin = margin;
	rightmargin = pagewidth - margin;
 
	vertmarginwidth = pageheight - (margin * 2);
	horizmarginwidth = pagewidth - (margin * 2);
 
	noindent = 0;
	indent1 = noindent + 15;
	indent2 = indent1 + 15;
 
	//font sizes:
	fontFamily = "Times New Roman";
	headersize = 15;
	titlesize = 12;
	stitlesize = 10;
	normalsize = 8;
	contractsize = 6;
	pagenumsize = 8;
 
	totaldepth = topmargin;
	pagenum = 1;
	totalpages = 5;
}
 
//draw rich text in a rect:
qreal PdfGenerate::drawrichtextinrect(QPainter *painter, qreal ulx, qreal uly, qreal rwidth, int flags, QString &text, int fontsize) {
	QRectF rect(ulx, uly - 2, rwidth, 0);
	qreal txtHeight = rect.height();
 
	QTextDocument textdocument;
	textdocument.setHtml(text);
	textdocument.setDefaultFont(QFont(fontFamily, fontsize));
 
	textdocument.setPageSize(QSize(rect.width(), QWIDGETSIZE_MAX));
 
	QAbstractTextDocumentLayout* layout = textdocument.documentLayout();
 
	//if our text takes up more than the rectangle height, then return the actual space taken up:
	if (layout->documentSize().height() > txtHeight) {
		txtHeight = layout->documentSize().height() - 4;
	}	
 
	const int height = qRound(layout->documentSize().height());
 
	int y = rect.y();
	if (flags & Qt::AlignBottom)
		y += (rect.height() - height);
	else if (flags & Qt::AlignVCenter)
		y += (rect.height() - height)/2;
 
	QAbstractTextDocumentLayout::PaintContext context;
	context.palette.setColor(QPalette::Text, painter->pen().color());
 
	painter->save();
 
	painter->translate(rect.x(), rect.y());
	layout->draw(painter, context);
 
	painter->restore();
 
	return txtHeight;
}
 
void PdfGenerate::printlastpage(QPainter& painter) {
	painter.end(); //done drawing, so save the PDF
}

void PdfGenerate::generatePdf() {

	QString stufftowritetopdf;

	QPrinter printer; //create a printer
	setupLetterPoints(printer, "filename.pdf"); //set up reference points for our coordinate system
	QPainter painter(&printer); //make a painter, which uses this printer,

       ///////////////////////////////////////////
       /// in here draw some text
       /////////////////////////////////////////////

       stufftowritetopdf = "here we put a lot of text so that its long enough 
to force a word wrap. When this text is rendered in linux and windows, 
the resulting PDFs will have a different visable font size, even though the
 code and text is the same. If You put enough text here to fill up a page 
when compiled in linux, it will run off the bottom of the page in the windows
 compiled version due to the windows version using a larger font size.";
	totaldepth = totaldepth + drawrichtextinrect(&painter, leftmargin, totaldepth, horizmarginwidth, 0, stufftowritetopdf, normalsize);

       ///////////////////////////////////////////
       /// done drawing text
       /////////////////////////////////////////////

        printlastpage(painter); //end the final page:
}

//set up the point coordinates for a letter sheet of paper:
void PdfGenerate::setupLetterPoints(QPrinter& printer, QString filename) {

	printer.setOrientation(QPrinter::Portrait); //set theorientation of the paper
	printer.setOutputFormat(QPrinter::PdfFormat); //make that printer as a PDF
	printer.setOutputFileName(filename); //set the PDF file name
	printer.setPaperSize(QPrinter::Letter); //set paper size
	printer.setFullPage(false); //coordinates based on printable area
	printer.setPageMargins( 0.5, 0.5, 0.5, 0.5, QPrinter::Inch);
	printer.setResolution(72); //72 is standard

	//(72 points / inch)
	pagewidth = 540; //8.5 inch
	pageheight = 720; //11 inch
	
	margin = 0; // 0.5 inch margin
	
	topmargin = margin;
	bottommargin = pageheight - margin;
	leftmargin = margin;
	rightmargin = pagewidth - margin;
	
	vertmarginwidth = pageheight - (margin * 2);
	horizmarginwidth = pagewidth - (margin * 2);
	
	noindent = 0;
	indent1 = noindent + 15;
	indent2 = indent1 + 15;
	
	//font sizes:
	fontFamily = "Times New Roman";
	headersize = 15;
	titlesize = 12;
	stitlesize = 10;
	normalsize = 8;
	contractsize = 6;
	pagenumsize = 8;
	
	totaldepth = topmargin;
	pagenum = 1;
	totalpages = 5;
}

//draw rich text in a rect:
qreal PdfGenerate::drawrichtextinrect(QPainter *painter, qreal ulx, qreal uly, qreal rwidth, int flags, QString &text, int fontsize) {
	QRectF rect(ulx, uly - 2, rwidth, 0);
	qreal txtHeight = rect.height();
	
	QTextDocument textdocument;
	textdocument.setHtml(text);
	textdocument.setDefaultFont(QFont(fontFamily, fontsize));

	textdocument.setPageSize(QSize(rect.width(), QWIDGETSIZE_MAX));

	QAbstractTextDocumentLayout* layout = textdocument.documentLayout();
	
	//if our text takes up more than the rectangle height, then return the actual space taken up:
	if (layout->documentSize().height() > txtHeight) {
		txtHeight = layout->documentSize().height() - 4;
	}	
	
	const int height = qRound(layout->documentSize().height());
	
	int y = rect.y();
	if (flags & Qt::AlignBottom)
		y += (rect.height() - height);
	else if (flags & Qt::AlignVCenter)
		y += (rect.height() - height)/2;

	QAbstractTextDocumentLayout::PaintContext context;
	context.palette.setColor(QPalette::Text, painter->pen().color());

	painter->save();

	painter->translate(rect.x(), rect.y());
	layout->draw(painter, context);

	painter->restore();
	
	return txtHeight;
}

void PdfGenerate::printlastpage(QPainter& painter) {
	painter.end(); //done drawing, so save the PDF
}

To copy to clipboard, switch view to plain text mode 

Also, the PDF that is generated on the linux machine looks the same on the windows machine as it does on the linux machine. Conversely the PDF generated on the windows machine will have larger fonts when viewed on the linux machine. This leads me to believe the problem lies either in my code, the font, or a difference in the PDF QPrinter from windows to linux.