import QtQuick 2.0
import QtGraphicalEffects 1.0

Rectangle {
    width: 280
    height: 280
    color: "black"

    Text {
        id: faultyItem
        anchors.centerIn: parent
        color: "red"

        layer.enabled: true
        layer.effect: ShaderEffect {
            fragmentShader: "
                uniform lowp sampler2D source; // this item
                uniform lowp float qt_Opacity; // inherited opacity of this item
                varying highp vec2 qt_TexCoord0;
                void main() {
                    lowp vec4 p = texture2D(source, qt_TexCoord0);
                    lowp float g = dot(p.xyz, vec3(0.344, 0.5, 0.156));
                    gl_FragColor = vec4(g, g, g, p.a) * qt_Opacity;
                }"
        }
    }

    Timer {
        repeat: true
        interval: 1000
        running: true
        property int count: 0
        onTriggered: {
            count = count +1
            faultyItem.text = count
        }
    }
}