[Issue N193466] SVG Rendering Regresion in > Qt 4.3.0

[Thomas Georgiou]

Sorry for the late response
I wrote a testcase exhibiting this using just Qt libraries.  The
testcase is attached.  The testcase is supposed to draw the "center"
element of panel-background.svg (included) into the boundingrect of a
qgi.  It also draws a red rectangle to show where it is.
In Qt 4.3.0, it looks like this (after making window a little larger):
http://img519.imageshack.us/img519/4176/qt430ti1.png .  It fills the
entire boundingrect.
In Qt 4.3.3 (and with Qt 4.3.1 as I tested earlier below in the
screenshots and bugreport screenshots), it looks like this:
http://img106.imageshack.us/img106/6973/qt433aj1.png .  It gets
clipped incorrectly and does not fill the entire boundingrect.
This seems to be a regression in QSvgRenderer.

Thomas Georgiou

On Jan 7, 2008 9:47 AM,  <qt-bugs at trolltech.com> wrote:
>
> Hi Thomas ,
>
> I tried loading the SVG file "panel-backround.svg" with several Qt
> versions 4.2.x /4.3.x and latest 4.4.0 snapshot and the result was the
> same as other SVG viewers ( Firefox, Opera ) displayed. The issue was
> not reproducible with that SVG file. Could you please send us such file
> that reproduces the problem?
>
> Kind regards,
> Petref
>
>
> On Saturday, 05. Jan 2008 04:31 TAGeorgiou at gmail.com wrote:
> > Short description:
> > SVG Rendering Regresion in > Qt 4.3.0
> >
> > What I did:
> > After updating to Qt 4.3.0, I tried to run plasma code, but the svgs
> > looked all ugly.
> >
> > What I expected to see:
> > I expected to see
> > http://img502.imageshack.us/img502/9018/plasmapanel1nv5.png (which is
> > run with Qt 4.3.0) (I colored the element of the svg that is painted
> > red, normally black).  Notice how it completely fills the right part
> > of the panel.
> >
> > What I got instead:
> > This is with Qt 4.3.3
> > http://img148.imageshack.us/img148/3594/plasmapanel2oa6.png Notice how
> > the red (the painted part of an svg) is not filled all the way as it
> > was with 4.3.0.
> >
> > More info:
> > This affects svg theming of plasma and is the issue in this bug report
> > here: http://bugs.kde.org/show_bug.cgi?id=149425 where the screenshot
> > is of a black rectangle in an svg rendered to a target qrect.
> >
> > To quote Aaron Seigo:
> > this is lame, lame, lame and then extra sugar lame on top. but
> > QSvgRenderer has some *serious* issues when it resizes svg's; rounding
> > errors get magnified to the point that they become these monstrously
> > huge innacurracies =( i can't do anything better for 4.0, but plan on
> > working with TT on these issues for 4.1
> >
> > The svg is here
> > http://websvn.kde.org/*checkout*/trunk/KDE/kdebase/workspace/plasma/desktoptheme/widgets/panel-background.svg
> > .  The element that is trying to be painted is "center".
>
> --
> Petref Saraci
> Support Engineer
> Trolltech ASA, Oslo - http://www.trolltech.com
>
>
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