[Qt-interest] QImage mirror crash

[Richard Baron Penman]

hello,

Perhaps it is a memory problem as that bug report suggests. If
mirroring could be done in place as well that would be handy.

Richard



On 12/9/08, Ian Thomson <Ian.Thomson at iongeo.com> wrote:
> Hi,
>
>  If you're not going to show code or provide a minimal example which
>  shows the bug then there is not much anyone can do to help.
>
>  Any known issues are listed in the trolltech task tracker on the
>  website. The only open one which mentions QImage and mirrored is
>  http://trolltech.com/developer/task-tracker/index_html?method=entry&id=208771
>  Perhaps that is related.
>
>  Cheers,
>  Ian.
>
>
>
>
>  Richard Baron Penman wrote:
>  > if I ignore the output of mirrored() and use the original image it
>  > doesn't crash:
>  > image.mirrored()
>  >
>  > However if I try to use the output then it crashes:
>  > image = image.mirrored()
>  >
>  >
>  > On 12/9/08, Benjamin <ikipou at gmail.com> wrote:
>  >> On Linux I have no problem with mirrored. Seeing your code should help
>  >>  to find the problem.
>  >>
>  >>  2008/12/9 Richard Baron Penman <richardbp+qt at gmail.com>:
>  >>
>  >>> hello,
>  >>  >
>  >>  > I want to flip a QImage and until now have been using the following method:
>  >>  >
>  >>  >>    QRect rectDisplay(0, 0, m_displayWidth, m_displayHeight);
>  >>  >>    painter.scale(1, -1);
>  >>  >>    painter.translate(0, -rectDisplay.height());
>  >>  >>    painter.drawImage(rectDisplay, m_Image);
>  >>  >
>  >>  > This has worked fine. I noticed that QImage has a mirrored() function
>  >>  > that should achieve the same effect with arguments of (true, false). I
>  >>  > would like to clean up my code and use this instead, but when I try it
>  >>  > my program crashes.
>  >>  > Are there known problems with QImage::mirrored()?
>  >>  >
>  >>  > FYI: Qt 4.4.2, XP SP2
>  >>  >
>  >>  > Richard
>  >>
>  >>> _______________________________________________
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>  >>  > Qt-interest at trolltech.com
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>  >>  >
>  >>
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