Huge CPU-load with QML AnimatedImage .gif

louis

Hi,

i traced down a huge CPU usage on my (embdedded) Linux based System. using eglfs the listView is invisible. Qt 5.1.1 QtQuick 2.0

usage:

        ListView
        {
          id: commandsView
          anchors.fill: parent
          clip: true
          boundsBehavior: Flickable.StopAtBounds
          delegate: ProgressDelegate {}
        }

in delegate:

  AnimatedImage
  {
    id: busyAnimation
    anchors.leftMargin: 8
    anchors.left: parent.left
    anchors.verticalCenter: parent.verticalCenter
    source: "/images/bg_Busy.gif"     // from http://loadinggif.com/
    visible: false
  }

Could the Problem be that the delegate does not know the length of the listView generating thousands of AnimatedImage?

SGaist

Hi,

I can't really comment on the CPU-load however 5.1.1 is rather old now, can you check again with Qt 5.5.1 or even 5.6 RC ?

louis

I'll try.

In fact, i just Need to outcomment the source: "/images/bg_Busy.gif " and everything is fine.

EDIT:
tried adding the property:
playing: visible

this works fine.
I would suggest to make this the Default value. :P

SGaist

Do you mean that if it's invisible and you start playing the gif it burns down the CPU ?

louis

I set the playing property to visible (which is false). However if it is visible, CPU is still running high (20% instead of 0.4%)

SGaist

You should test against a more recent version of Qt, there's been optimization done in between. Current is 5.6 RC