Add a new renderTarget enum to Canvas to avoid rasterisation through use of the new QSG* classes

import QtQuick 2.0

Rectangle {
    width: 400
    height: 400
    color: "black"

    Timer {
        id: timer
        running: true
        repeat: true
        interval: 1000
        property real rotation: 0
        property bool forward: false
        onTriggered: {
            forward = !forward;
            rotation += forward ? 10 : -10;
        }
    }

    Canvas {
        id: canvas
        anchors.centerIn: parent
        width: 100
        height: 100
        rotation: timer.rotation
        opacity: 0.75

        onPaint: {
            var ctx = getContext("2d");
            ctx.reset();

            ctx.beginPath();
            ctx.fillStyle = "steelblue";
            ctx.moveTo(width / 2, height / 2);
            var size = Math.PI / 8;
            ctx.arc(width / 2, height / 2, 50, -(size) - Math.PI / 2, size - Math.PI / 2, false);
            ctx.fill();
        }
    }
}

ctx.translate(1, 1);
ctx.scale((width - 2) / width, (height - 2) / height);