[Interest] Performance tips for 'ticker' animation?

[Cornelius Hald]

I've used the QML profiler to gather more information. Basically the
only thing that is going on is painting via "Animation Timer Update".

The profiler tells me that framerates are around 50 to 60 fps, so I
think it should still look smooth. Unfortunately it doesn't.

Are there ways to accelerate painting? Clipping is off and I tried
without antialiasing but couldn't see a difference.

Thanks,
Conny


On Mon, 2013-08-05 at 11:49 +0200, Cornelius Hald wrote:
> 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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