qt-everywhere-src-5.14.1/qtdeclarative/tests/manual/highdpi/imageprovider.qml

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import QtQuick 2.0
import "ImageProvider"

Rectangle {
    width: 400
    height: 400

    Row {
        // should render a sharp image on high-dpi displays. sourceSize is in device-independent
        // pixels; the image provider will be asked to create a 400x400 device pixel image.
        Image {
            sourceSize.width: 200
            sourceSize.height: 200
            source: "image://colors/green"
        }

        // should NOT render a sharp image on retina displays. sourceSize is omitted and
        // the image provider default size will be used (in this case 50x50).
        Image {
            width : 200
            height : 200
            source : "image://colors/red"
        }

    }
}