SourceProxy.qml

/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
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** This file is part of the Qt Graphical Effects module.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
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**     notice, this list of conditions and the following disclaimer.
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**     the documentation and/or other materials provided with the
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**     of its contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
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import QtQuick 2.0

Item {
    id: rootItem
    property variant input
    property variant output
    property variant sourceRect
    visible: false

    Component.onCompleted: evaluateInput()

    onInputChanged: evaluateInput()

    onSourceRectChanged: evaluateInput()

    function evaluateInput() {
        if (input == undefined) {
            output =  input
        }
        else if (sourceRect != undefined && sourceRect != Qt.rect(0, 0, 0, 0) && !isQQuickShaderEffectSource(input)) {
            proxySource.sourceItem = input
            output = proxySource
            proxySource.sourceRect = sourceRect
        }
        else if (isQQuickItemLayerEnabled(input)) {
            output = input
        }
        else if ((isQQuickImage(input) && !hasTileMode(input) && !hasChildren(input))) {
            output = input
        }