qml opacitymask generates high CPU load (100%)

themts

Hi,

If I use the opacitymask (windows, qt 5.5 or qt 5.6) it uses a complete core.
Is there any workaround for this bug?
Can I use something similar to the opacitymask without this bug?

CU
mts

themts

Has nobody seen the problem before or is there just no fix or workaround?

? Offline

@themts Hi! Is it this one? QTBUG-49574

themts

yes, somehow it's like that, besides I'm not using an AnimatedSprite.

It seams that there is a problem as soon as there is any kind of animation working in background.
Here is an example:

Rectangle {
        anchors.fill: parent
        color: "black"
    }

    Rectangle {
        id: opSource
        color: "red"
        width: 150
        height: 150
        visible: false
    }

    Rectangle {
        id: mask
        width: 150
        height: 150
        visible: false
    }

    OpacityMask {
        x: 372
        y: 167
        width: 183
        height: 156
        source: opSource
        maskSource: mask
        opacity: 1
    }

    Rectangle {
        x: 1081
        y: 47
        width: 82
        height: 86
        visible: true

        SequentialAnimation on opacity {
            running: true
            loops: Animation.Infinite
            NumberAnimation { from: 0.3; to: 1.0; duration: 1500}
            NumberAnimation { from: 1.0; to: 0.3; duration: 1500}
        }

    }

just put this code on an empty window and you will see that one core is at 100%.