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** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of the examples of the Qt Quick CL module
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import QtQuick 2.0
import QtQuick.Controls 1.0
import quickcl.qt.io 1.0

Item {
    Rectangle {
        id: orig
        width: parent.width / 2 - 4
        height: parent.height
        border.color: "magenta"
        border.width: 4

        Item {
            id: src
            anchors.fill: parent
            layer.enabled: true
            Image {
                anchors.fill: parent
                anchors.margins: 4
                source: "image.png"
            }
            Image {
                source: "qt.png"
                width: 100
                height: 100
                smooth: true
                SequentialAnimation on scale {
                    loops: Animation.Infinite
                    NumberAnimation { from: 1; to: 8; duration: 2000; easing.type: Easing.OutBounce }
                    PauseAnimation { duration: 2000 }
                    NumberAnimation { from: 8; to: 1; duration: 2000; easing.type: Easing.OutBounce }
                    PauseAnimation { duration: 2000 }
                }
                NumberAnimation on rotation { from: 0; to: 360; duration: 2000; loops: Animation.Infinite }
                anchors.centerIn: parent
            }
        }
    }

    Rectangle {
        width: parent.width / 2 - 4
        height: parent.height
        anchors.left: orig.right
        anchors.leftMargin: 4
        border.color: "magenta"
        border.width: 4

        CLItem {
            id: clItem
            source: src
            anchors.fill: parent
            anchors.margins: 4
            onNewResultsAvailable: {
                var maxValue = rectRoot.height - topText.y - topText.height;
                for (var i = 0; i < 256; ++i)
                    rep.itemAt(i).height = Math.max(1, Math.min(result.get(i) / scaleFactor.value, maxValue))
            }
            Item {
                anchors.fill: parent
                Row {
                    anchors.fill: parent
                    id: rectRoot
                    Repeater {
                        id: rep
                        // It might be tempting to use clItem.result as the
                        // model. This would however result in a serious
                        // slowdown due to dropping and adding 256 new
                        // rectangles on every update.
                        model: 256
                        Rectangle {
                            width: parent ? parent.width / rep.count : 0
                            height: 0
                            y: parent ? parent.height - height : 0
                            color: "black"
                        }
                    }
                }
            }
        }
        Text {
            id: topText
            font.pointSize: 16
            text: "Histogram calculated on the GPU with OpenCL (scale: " + Math.round(scaleFactor.value) + ")"
            color: "green"
            x: 10
            y: 10
        }
        Slider {
            id: scaleFactor
            x: 10
            anchors.top: topText.bottom
            anchors.bottom: parent.bottom
            anchors.margins: 10
            minimumValue: 1
            maximumValue: 1024
            value: 8
            orientation: Qt.Vertical
        }
    }
}