[Interest] Performance tips for 'ticker' animation?

[Cornelius Hald]

That sounds like an option and I'll give it a try using a manually
created bitmap. If this works I'll consider creating this pixmap
dynamically during runtime.

In the mean time I've tried optimizing the animation by putting the text
on a rectangle with solid background and animating that rectangle
instead of the text element. Also tried setting "layer.enabled: true" on
that rectangle, but it didn't help anything.

If anyone has other ideas, please let me know.

Thanks,
Conny


On Wed, 2013-08-07 at 14:23 +0000, bill.king at here.com wrote:
> I'm shooting in the dark here, but possibly the issue could be continued re-rendering of the text. I found this way of animating a ticker to be high in cost of cpu cycles. If you can render to a pixmap, then scroll/blit the pixmap through a view area, this ends up being a very low cost way of achieving animation (and for me, also resulted in much better fluidity)
> 
> --
> 
> Bill King
> Senior QA Engineer
> TRG Group
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> 
> > -----Original Message-----
> > From: interest-bounces+bill.king=nokia.com at qt-project.org
> > [mailto:interest-bounces+bill.king=nokia.com at qt-project.org] On Behalf Of
> > ext Cornelius Hald
> > Sent: Monday, 5 August 2013 11:49 AM
> > To: Interest at qt-project.org
> > Subject: [Interest] Performance tips for 'ticker' animation?
> > 
> > Hi guys,
> > 
> > I'm having a kiosk application displaying video and web content in FullHD
> > using QtQuick 2.1 on Linux Qt 5.1.
> > 
> > Now I've added a text ticker that sits at the bottom of the screen and scrolls
> > text from right to left.
> > 
> > If I only display the ticker, the animation is smooth. But as soon as I play a
> > video or display (static) web content in the background, the ticker animation
> > starts to stutter quite badly. Still the CPU load is only around 30%.
> > 
> > Does anyone have some tips on how to improve the visual smoothness of
> > the ticker animation?
> > 
> > Below is the code I'm currently using to animate the ticker.
> > 
> > Thanks,
> > Conny
> > 
> > 
> > import QtQuick 2.1
> > Rectangle {
> >   id: root
> >   property alias text: text.text
> >   height: 100
> >   color: "red"
> > 
> >   Text {
> >     id: text
> >     text: "This is some ticker text that gets displayed whenever you're seeing
> > this ticker here, bla bla bla..."
> >     color: "white"
> >     font.pixelSize: 80
> >     anchors.verticalCenter: parent.verticalCenter
> > 
> >     NumberAnimation on x {
> >       from: root.width
> >       to: -text.width
> >       duration: text.width * 10
> >       loops: Animation.Infinite
> >       onFromChanged: restart()
> >     }
> >   }
> > }
> > 
> > 
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