Example for running animations on the render thread

Change-Id: I7a829f201c9d1514b2462e7f3bd11761d02cb66c
Reviewed-by: Alan Alpert (Personal) <416365416c@gmail.com>

8 files changed, 409 insertions, 0 deletions

diff --git a/examples/quick/scenegraph/scenegraph.pro b/examples/quick/scenegraph/scenegraph.pro
index 3ddb216615..4354954445 100644
--- a/examples/quick/scenegraph/scenegraph.pro
+++ b/examples/quick/scenegraph/scenegraph.pro
@@ -5,3 +5,4 @@ SUBDIRS += \
         simplematerial \
         textureinsgnode \
         textureinthread \
+        threadedanimation
diff --git a/examples/quick/scenegraph/threadedanimation/main.cpp b/examples/quick/scenegraph/threadedanimation/main.cpp
new file mode 100644
index 0000000000..28abf9da94
--- /dev/null
+++ b/examples/quick/scenegraph/threadedanimation/main.cpp
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QGuiApplication>
+#include <QtQuick/QQuickView>
+
+#include "spinner.h"
+
+int main(int argc, char **argv)
+{
+    QGuiApplication app(argc, argv);
+
+    qmlRegisterType<Spinner>("Spinner", 1, 0, "Spinner");
+
+    QQuickView view;
+    view.setSource(QUrl("qrc:///scenegraph/threadedanimation/main.qml"));
+    view.show();
+
+    return app.exec();
+}
diff --git a/examples/quick/scenegraph/threadedanimation/main.qml b/examples/quick/scenegraph/threadedanimation/main.qml
new file mode 100644
index 0000000000..30ba9a2eb1
--- /dev/null
+++ b/examples/quick/scenegraph/threadedanimation/main.qml
@@ -0,0 +1,134 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [1]
+import QtQuick 2.0
+import Spinner 1.0
+
+Rectangle {
+
+    width: 320
+    height: 480
+
+    gradient: Gradient {
+        GradientStop { position: 0; color: "lightsteelblue" }
+        GradientStop { position: 1; color: "black" }
+    }
+
+    Rectangle {
+        color: Qt.rgba(1, 1, 1, 0.7);
+        radius: 10
+        border.width: 1
+        border.color: "white"
+        anchors.fill: blockingLabel;
+        anchors.margins: -10
+    }
+
+    Text {
+        id: blockingLabel
+        color: blocker.running ? "red" : "black"
+        text: blocker.running ? "Blocked!" : "Not blocked"
+        anchors.horizontalCenter: parent.horizontalCenter
+        anchors.top: parent.top
+        anchors.topMargin: 100
+    }
+
+    Timer {
+        id: blocker
+        interval: 357
+        running: false;
+        repeat: true
+        onTriggered: {
+            var d = new Date();
+            var x = 0;
+            var wait = 50 + Math.random() * 200;
+            while ((new Date().getTime() - d.getTime()) < 100) {
+                x += 1;
+            }
+        }
+    }
+
+    Timer {
+        id: blockerEnabler
+        interval: 4000
+        running: true
+        repeat: true
+        onTriggered: {
+            blocker.running = !blocker.running
+        }
+    }
+
+    Spinner {
+        anchors.centerIn: parent
+        anchors.horizontalCenterOffset: 80
+        spinning: true
+    }
+
+    Image {
+        anchors.centerIn: parent
+        anchors.horizontalCenterOffset: -80
+        source: "spinner.png"
+        NumberAnimation on rotation {
+            from: 0; to: 360; duration: 1000; loops: Animation.Infinite
+        }
+    }
+
+    Rectangle {
+        color: Qt.rgba(1, 1, 1, 0.7)
+        radius: 10
+        border.width: 1
+        border.color: "white"
+        anchors.fill: label
+        anchors.margins: -10
+    }
+
+    Text {
+        id: label
+        color: "black"
+        wrapMode: Text.WordWrap
+        text: "This application shows two spinners. The one to the right is animated on the scene graph thread (when applicable) and the left one is using the normal Qt Quick animation system."
+        anchors.right: parent.right
+        anchors.left: parent.left
+        anchors.bottom: parent.bottom
+        anchors.margins: 20
+    }
+}
+//! [2]
diff --git a/examples/quick/scenegraph/threadedanimation/spinner.cpp b/examples/quick/scenegraph/threadedanimation/spinner.cpp
new file mode 100644
index 0000000000..7efcdb5da6
--- /dev/null
+++ b/examples/quick/scenegraph/threadedanimation/spinner.cpp
@@ -0,0 +1,133 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "spinner.h"
+
+#include <QtQuick/QQuickWindow>
+#include <QtGui/QScreen>
+#include <QtQuick/QSGSimpleTextureNode>
+
+#include <QtGui/QConicalGradient>
+#include <QtGui/QPainter>
+
+class SpinnerNode : public QObject, public QSGTransformNode
+{
+    Q_OBJECT
+public:
+    SpinnerNode(QQuickWindow *window)
+        : m_rotation(0)
+        , m_spinning(false)
+        , m_window(window)
+    {
+        connect(window, SIGNAL(beforeRendering()), this, SLOT(maybeRotate()));
+        connect(window, SIGNAL(frameSwapped()), this, SLOT(maybeUpdate()));
+
+        QImage image(":/scenegraph/threadedanimation/spinner.png");
+        m_texture = window->createTextureFromImage(image);
+        QSGSimpleTextureNode *textureNode = new QSGSimpleTextureNode();
+        textureNode->setTexture(m_texture);
+        textureNode->setRect(0, 0, image.width(), image.height());
+        textureNode->setFiltering(QSGTexture::Linear);
+        appendChildNode(textureNode);
+    }
+
+    ~SpinnerNode() {
+        delete m_texture;
+    }
+
+    void setSpinning(bool spinning)
+    {
+        m_spinning = spinning;
+    }
+
+public slots:
+    void maybeRotate() {
+        if (m_spinning) {
+            m_rotation += (360 / m_window->screen()->refreshRate());
+            QMatrix4x4 matrix;
+            matrix.translate(32, 32);
+            matrix.rotate(m_rotation, 0, 0, 1);
+            matrix.translate(-32, -32);
+            setMatrix(matrix);
+        }
+    }
+
+    void maybeUpdate() {
+        if (m_spinning) {
+            m_window->update();
+        }
+    }
+
+private:
+    qreal m_rotation;
+    bool m_spinning;
+    QSGTexture *m_texture;
+    QQuickWindow *m_window;
+};
+
+Spinner::Spinner()
+    : m_spinning(false)
+{
+    setSize(QSize(64, 64));
+    setFlag(ItemHasContents);
+}
+
+void Spinner::setSpinning(bool spinning)
+{
+    if (spinning == m_spinning)
+        return;
+    m_spinning = spinning;
+    emit spinningChanged();
+    update();
+}
+
+QSGNode *Spinner::updatePaintNode(QSGNode *old, UpdatePaintNodeData *)
+{
+    SpinnerNode *n = static_cast<SpinnerNode *>(old);
+    if (!n)
+        n = new SpinnerNode(window());
+
+    n->setSpinning(m_spinning);
+
+    return n;
+}
+
+#include "spinner.moc"
diff --git a/examples/quick/scenegraph/threadedanimation/spinner.h b/examples/quick/scenegraph/threadedanimation/spinner.h
new file mode 100644
index 0000000000..01b489021f
--- /dev/null
+++ b/examples/quick/scenegraph/threadedanimation/spinner.h
@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SPINNER_H
+#define SPINNER_H
+
+#include <QtQuick/QQuickItem>
+
+class Spinner : public QQuickItem
+{
+    Q_OBJECT
+
+    Q_PROPERTY(bool spinning READ spinning WRITE setSpinning NOTIFY spinningChanged)
+
+public:
+    Spinner();
+
+    bool spinning() const { return m_spinning; }
+    void setSpinning(bool spinning);
+
+protected:
+    QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *);
+
+signals:
+    void spinningChanged();
+
+private:
+    bool m_spinning;
+};
+
+#endif // SQUIRCLE_H
diff --git a/examples/quick/scenegraph/threadedanimation/spinner.png b/examples/quick/scenegraph/threadedanimation/spinner.png
new file mode 100644
index 0000000000..bacb1698d7
--- /dev/null
+++ b/examples/quick/scenegraph/threadedanimation/spinner.png
diff --git a/examples/quick/scenegraph/threadedanimation/threadedanimation.pro b/examples/quick/scenegraph/threadedanimation/threadedanimation.pro
new file mode 100644
index 0000000000..419ee97e2e
--- /dev/null
+++ b/examples/quick/scenegraph/threadedanimation/threadedanimation.pro
@@ -0,0 +1,8 @@
+QT += qml quick
+
+HEADERS += spinner.h
+SOURCES += spinner.cpp main.cpp
+RESOURCES += threadedanimation.qrc
+
+target.path = $$[QT_INSTALL_EXAMPLES]/quick/scenegraph/threadedanimation
+INSTALLS += target
diff --git a/examples/quick/scenegraph/threadedanimation/threadedanimation.qrc b/examples/quick/scenegraph/threadedanimation/threadedanimation.qrc
new file mode 100644
index 0000000000..ecaf4f7a31
--- /dev/null
+++ b/examples/quick/scenegraph/threadedanimation/threadedanimation.qrc
@@ -0,0 +1,6 @@
+<RCC>
+    <qresource prefix="/scenegraph/threadedanimation">
+        <file>main.qml</file>
+        <file>spinner.png</file>
+    </qresource>
+</RCC>