Graphical distortions when drawing paths using Qt5

[Adam Reichold]

When using qpdfview with Qt5, there are graphical distortions when drawing paths for the "decorate links" function, c.f. attached screenshot. This happens independently of the format plug-in used, but since Poppler's Qt5 frontend had its first release, the problem becomes a bigger concern.

I did check that there is no difference in the rectangle and then paths that are read from the document files and if I replace the combination

painter.setTransform(m_normalizedTransform, true);
painter.drawPath(link->boundary);

by

painter.drawRect(m_normalizedTransform.map(link->boundary));

the distortions disappear. (But this seems a hack at best and also inconsistent with the other interfaces or QPainter.)

Also the detection of the mouse pointer position does not seem to be affected, so the program is perfectly usable with the "decorate links" setting disabled.

[Adam Reichold (adamreichold)]

This is resolved in trunk revision 1215 by setting the Qt4 compatibility render hint of QPainter, but should be investigated further.

[Adam Reichold (adamreichold)]

Thanks to help by Alexander Volkov who pointed out to me that Qt 5 scales the pen width using the painter transform, this is now properly fixed by using cosmetic pens, i.e. of width zero.