Invert greyscale Image?

[patrickkidd]

I am using greyscale Image for png-based buttons. I need to invert the image bitmap when the background changes from white to black. How is this possible?

Thanks!

[patrickkidd]

@patrickkidd This did it, and required making an all-white mask png:

import QtQuick 2.12
import QtGraphicalEffects 1.13

Rectangle {

    id: root
    property string source: 'icon.png'
    property bool inverted: true    

    height: 200
    width: 300

    Image {
        id: mainImage
        source: root.source
        anchors.fill: parent
        visible: !inverted
    }

    Image {
        id: allWhite
        visible: false
        source: 'resources/all-white.png'
    }

    Blend {
        visible: inverted
        source: mainImage
        foregroundSource: allWhite
        mode: 'negation'
        anchors.fill: parent
    }
}