[Interest] QPdfWriter - ability to embed XML?

Jason H jhihn at gmx.com
Wed Jun 10 20:20:57 CEST 2015

I have a months-open bug. It took me forever to convince the trolls that it is a bug. What I discovered is that it assumes 72dpi, rather than using the proper DPI setting. Scaling your fonts by newDPI/72 *fontSize will get it to the correct size. Note that when printing I only ever use pointSize, not pixelSize.
Though the bug description I think is some-what over limiting. I have it on Linux too, where it was discovered. I don't know why/if it is limited to widgets. But I wrote a trivial function to find the QLabels and such to adjust their font size before rendering. (At this point in the discussion I should mention I do my print-outs as widgets, with a widget heirarchy)

> > void PdfReport::fixFonts(QObject *w, QPaintDevice *pd) {
> > qreal ratio = pd->logicalDpiX() / 72.0;
> > fixFonts(w,ratio);
> > }
> >
> > void PdfReport::fixFonts(QObject *w, qreal ratio) {
> > foreach (QObject *c, w->children())
> > {
> > QString cname = c->metaObject()->className();
> > if (cname == "QLabel") {
> > QLabel *l = qobject_cast<QLabel*>(c);
> > if (l) {
> > QFont f = l->font();
> > f.setPointSize(f.pointSize()*ratio);
> > l->setFont(f);
> > }
> > }
> > fixFonts(c, ratio);
> > }
> > }


Sent: Wednesday, June 10, 2015 at 1:35 PM
From: "Edward Sutton" <edward.sutton at subsite.com>
To: "Giuseppe D'Angelo" <dangelog at gmail.com>
Cc: "interest at qt-project.org" <interest at qt-project.org>
Subject: Re: [Interest] QPdfWriter - ability to embed XML?

Hi Giuseppe, 

On Jun 10, 2015, at 11:57 AM, Giuseppe D'Angelo <dangelog at gmail.com> wrote: 
On Wed, Jun 10, 2015 at 6:51 PM, Edward Sutton
<edward.sutton at subsite.com[edward.sutton at subsite.com]> wrote:

Crap. It looks like I could have used QPdfWriter on iOS and saved me a lot
of Objective-C headaches.  I replaced QPrinter with QPdfWriter and it
basically seems to work except the fonts in the PDF are extremely tiny.  I
may have to switch to QPdfWriter now.
This looks like a bug that should have been already solved in 5.4.x.
If not, please report it!
I am using Qt 5.5 RC snapshot.  
Are you saying the *very* *small* font size is a possible bug?
I changed to using pointsize and now my drawn text is legible.
However all output rendered using QTextDocument::setHtml(“<h3>Hello World</h3>”) still renders *very* *very* small.
I assumed the “tiny font” issue might be the result of QPdfWriter using point size for fonts and QPrinter was using pixel size?
Giuseppe D'Angelo
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