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I have a QImage and a QPainter that paints on this image. After painting I tried to insert this QImage to QTextDocument with QTextCursor's insertImage method : 

QImage image(width ,height,QImage::Format_RGB32);
QPainter paint;
paint.begin(&image);
paint.drawText(25,25,someText);
paint.end();
QTextCursor cursor(doc);
cursor.movePosition(QTextCursor::End);
cursor.insertImage(image);

But after doing this what I got is a text with a low resolution or a line width saggy pixels like in this image :

!(http://imgim.com/4698inciz7774617.png)line image

I tried setting QTextDocument's layout's paint device but it gave an error because of null pointer, this is most probably because of the document does not have a layout I tried setting render hints of painter but it does not work too. I inserted some html before the image in the document but they are good in terms of resolution, also there are no problem in flat lines. When I show this document in a QTextEdit it seems fine, but when this is in a pdf file in a preview or something something goes wrong. My printer is defined like that in preview : 

QPrinter printer(QPrinter::HighResolution);
QPrinter highprinter(QPrinter::ScreenResolution);
printer.setPaperSize(QPrinter::A4);

And I call QTextDocument's print method for printing. Do you have any solutions for this? thanks

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1 Answers1

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Saggy pixels can be eliminated somehow with : QPainter::setRenderHint(QPainter::Antialiasing, true); however it seems it does not eliminate saggy pixels in letters very much. Other way of eliminating saggy pixels fully is creating a document with large pixel sizes (resolution) and increasing size of the image.After that we can increase font point size and line widths it prevents aliasing as I saw in my trials.

//increasing line width when drawing line
paint.setPen(QPen(Qt::gray,20, Qt::SolidLine, Qt::RoundCap, Qt::MiterJoin));
//increasing font's point size  when using text
qFont2.setPointSize(100);
paint.setFont(qFont2);

However increasing font point size does not prevent aliasing when the image's pixel size (resolution) remains same

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