Implement a variant on blurpicker that shows a custom shader.

10 files changed, 569 insertions, 0 deletions

diff --git a/examples/graphicsview/customshader/blureffect.cpp b/examples/graphicsview/customshader/blureffect.cpp
new file mode 100644
index 0000000..8345d0b
--- /dev/null
+++ b/examples/graphicsview/customshader/blureffect.cpp
@@ -0,0 +1,70 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "blureffect.h"
+
+#include <QDebug>
+
+BlurEffect::BlurEffect(QObject *parent)
+    : QGraphicsBlurEffect()
+    , m_baseLine(200)
+{
+}
+
+void BlurEffect::adjustForItem(const QGraphicsItem *item)
+{
+    qreal y = m_baseLine - item->pos().y();
+    qreal radius = qBound(0.0, y / 32, 16.0);
+    setBlurRadius(radius);
+}
+
+QRectF BlurEffect::boundingRectFor(const QGraphicsItem *item)
+{
+    adjustForItem(item);
+    return QGraphicsBlurEffect::boundingRectFor(item);
+}
+
+void BlurEffect::drawItem(QGraphicsItem *item, QPainter *painter,
+                                       const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    adjustForItem(item);
+    QGraphicsBlurEffect::drawItem(item, painter, option, widget);
+}
diff --git a/examples/graphicsview/customshader/blureffect.h b/examples/graphicsview/customshader/blureffect.h
new file mode 100644
index 0000000..24a6867
--- /dev/null
+++ b/examples/graphicsview/customshader/blureffect.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef BLUREFFECT_H
+#define BLUREFFECT_H
+
+#include <QGraphicsEffect>
+#include <QGraphicsItem>
+
+class BlurEffect: public QGraphicsBlurEffect
+{
+public:
+    BlurEffect(QObject *parent = 0);
+
+    void setBaseLine(qreal y) { m_baseLine = y; }
+
+    QRectF boundingRectFor(const QGraphicsItem *item);
+
+    void drawItem(QGraphicsItem *item, QPainter *painter,
+                  const QStyleOptionGraphicsItem *option = 0,
+                  QWidget *widget = 0);
+
+private:
+    void adjustForItem(const QGraphicsItem *item);
+
+private:
+    qreal m_baseLine;
+};
+
+#endif // BLUREFFECT_H
diff --git a/examples/graphicsview/customshader/blurpicker.cpp b/examples/graphicsview/customshader/blurpicker.cpp
new file mode 100644
index 0000000..32bfc89
--- /dev/null
+++ b/examples/graphicsview/customshader/blurpicker.cpp
@@ -0,0 +1,138 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "blurpicker.h"
+
+#include <QtGui>
+
+#include "blureffect.h"
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+BlurPicker::BlurPicker(QWidget *parent): QGraphicsView(parent), m_index(0.0)
+{
+    setBackgroundBrush(QPixmap(":/images/background.jpg"));
+    setScene(&m_scene);
+
+    setupScene();
+    updateIconPositions();
+
+    connect(&m_timeLine, SIGNAL(valueChanged(qreal)), SLOT(updateIconPositions()));
+    m_timeLine.setDuration(400);
+
+    setRenderHint(QPainter::Antialiasing, true);
+    setFrameStyle(QFrame::NoFrame);
+}
+
+void BlurPicker::updateIconPositions()
+{
+    m_index = m_timeLine.currentFrame() / 1000.0;
+
+    qreal baseline = 0;
+    for (int i = 0; i < m_icons.count(); ++i) {
+        QGraphicsItem *icon = m_icons[i];
+        qreal a = ((i + m_index) * 2 * M_PI) / m_icons.count();
+        qreal xs = 170 * sin(a);
+        qreal ys = 100 * cos(a);
+        QPointF pos(xs, ys);
+        pos = QTransform().rotate(-20).map(pos);
+        pos -= QPointF(40, 40);
+        icon->setPos(pos);
+        baseline = qMax(baseline, ys);
+    }
+
+    m_blurEffect->setBaseLine(baseline);
+    m_scene.update();
+}
+
+void BlurPicker::setupScene()
+{
+    m_scene.setSceneRect(-200, -120, 400, 240);
+
+    m_blurEffect = new BlurEffect(this);
+    m_customEffect = new CustomShaderEffect(this);
+
+    QStringList names;
+    names << ":/images/accessories-calculator.png";
+    names << ":/images/accessories-text-editor.png";
+    names << ":/images/help-browser.png";
+    names << ":/images/internet-group-chat.png";
+    names << ":/images/internet-mail.png";
+    names << ":/images/internet-web-browser.png";
+    names << ":/images/office-calendar.png";
+    names << ":/images/system-users.png";
+
+    for (int i = 0; i < names.count(); i++) {
+        QPixmap pixmap(names[i]);
+        QGraphicsPixmapItem *icon = m_scene.addPixmap(pixmap);
+        icon->setZValue(1);
+        if (i == 3)
+            icon->setEffect(m_customEffect);
+        else
+            icon->setEffect(m_blurEffect);
+        m_icons << icon;
+    }
+
+    QGraphicsPixmapItem *bg = m_scene.addPixmap(QPixmap(":/images/background.jpg"));
+    bg->setZValue(0);
+    bg->setPos(-200, -150);
+}
+
+void BlurPicker::keyPressEvent(QKeyEvent *event)
+{
+    if (event->key() == Qt::Key_Left) {
+        if (m_timeLine.state() == QTimeLine::NotRunning) {
+            m_timeLine.setFrameRange(m_index * 1000, m_index * 1000 - 1000);
+            m_timeLine.start();
+            event->accept();
+        }
+    }
+
+    if (event->key() == Qt::Key_Right) {
+        if (m_timeLine.state() == QTimeLine::NotRunning) {
+            m_timeLine.setFrameRange(m_index * 1000, m_index * 1000 + 1000);
+            m_timeLine.start();
+            event->accept();
+        }
+    }
+}
diff --git a/examples/graphicsview/customshader/blurpicker.h b/examples/graphicsview/customshader/blurpicker.h
new file mode 100644
index 0000000..b4ac97b
--- /dev/null
+++ b/examples/graphicsview/customshader/blurpicker.h
@@ -0,0 +1,77 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef BLURPICKER_H
+#define BLURPICKER_H
+
+#include <QGraphicsEffect>
+#include <QGraphicsView>
+#include <QTimeLine>
+
+#include "blureffect.h"
+#include "customshadereffect.h"
+
+class BlurPicker: public QGraphicsView
+{
+    Q_OBJECT
+
+public:
+    BlurPicker(QWidget *parent = 0);
+
+protected:
+    void keyPressEvent(QKeyEvent *event);
+
+private slots:
+    void updateIconPositions();
+
+private:
+    void setupScene();
+
+private:
+    qreal m_index;
+    QGraphicsScene m_scene;
+    BlurEffect *m_blurEffect;
+    CustomShaderEffect *m_customEffect;
+    QList<QGraphicsItem*> m_icons;
+    QTimeLine m_timeLine;
+};
+
+#endif // BLURPICKER_H
diff --git a/examples/graphicsview/customshader/blurpicker.qrc b/examples/graphicsview/customshader/blurpicker.qrc
new file mode 100644
index 0000000..e88eaca
--- /dev/null
+++ b/examples/graphicsview/customshader/blurpicker.qrc
@@ -0,0 +1,14 @@
+<RCC>
+    <qresource prefix="/" >
+        <file>images/background.jpg</file>
+        <file>images/accessories-calculator.png</file>
+        <file>images/accessories-text-editor.png</file>
+        <file>images/help-browser.png</file>
+        <file>images/internet-group-chat.png</file>
+        <file>images/internet-mail.png</file>
+        <file>images/internet-web-browser.png</file>
+        <file>images/office-calendar.png</file>
+        <file>images/system-users.png</file>
+    </qresource>
+</RCC>
+
diff --git a/examples/graphicsview/customshader/customshader.pro b/examples/graphicsview/customshader/customshader.pro
new file mode 100644
index 0000000..bc07d7a
--- /dev/null
+++ b/examples/graphicsview/customshader/customshader.pro
@@ -0,0 +1,10 @@
+SOURCES += main.cpp blurpicker.cpp blureffect.cpp customshadereffect.cpp
+HEADERS += blurpicker.h blureffect.h customshadereffect.h
+RESOURCES += blurpicker.qrc
+QT += opengl
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/graphicsview/blurpicker
+sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS blurpicker.pro
+sources.path = $$[QT_INSTALL_EXAMPLES]/graphicsview/blurpicker
+INSTALLS += target sources
diff --git a/examples/graphicsview/customshader/customshadereffect.cpp b/examples/graphicsview/customshader/customshadereffect.cpp
new file mode 100644
index 0000000..9f1945d
--- /dev/null
+++ b/examples/graphicsview/customshader/customshadereffect.cpp
@@ -0,0 +1,72 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "customshadereffect.h"
+#include <QGLShaderProgram>
+
+static char const colorizeShaderCode[] =
+    "varying highp vec2 textureCoords;\n"
+    "uniform sampler2D imageTexture;\n"
+    "uniform lowp vec4 effectColor;\n"
+    "lowp vec4 srcPixel() {\n"
+    "    vec4 src = texture2D(imageTexture, textureCoords);\n"
+    "    float gray = dot(src.rgb, vec3(0.212671, 0.715160, 0.072169));\n"
+    "    vec4 colorize = 1.0-((1.0-gray)*(1.0-effectColor));\n"
+    "    return vec4(colorize.rgb, src.a);\n"
+    "}";
+
+CustomShaderEffect::CustomShaderEffect(QObject *parent)
+    : QGraphicsShaderEffect(parent),
+      color(Qt::red)
+{
+    setPixelShaderFragment(colorizeShaderCode);
+}
+
+void CustomShaderEffect::setEffectColor(const QColor& c)
+{
+    color = c;
+    setUniformsDirty();
+}
+
+void CustomShaderEffect::setUniforms(QGLShaderProgram *program)
+{
+    program->setUniformValue("effectColor", color);
+}
diff --git a/examples/graphicsview/customshader/customshadereffect.h b/examples/graphicsview/customshader/customshadereffect.h
new file mode 100644
index 0000000..b4e0fb9
--- /dev/null
+++ b/examples/graphicsview/customshader/customshadereffect.h
@@ -0,0 +1,64 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CUSTOMSHADEREFFECT_H
+#define CUSTOMSHADEREFFECT_H
+
+#include <QGraphicsEffect>
+#include <QGraphicsShaderEffect>
+#include <QGraphicsItem>
+
+class CustomShaderEffect: public QGraphicsShaderEffect
+{
+public:
+    CustomShaderEffect(QObject *parent = 0);
+
+    QColor effectColor() const { return color; }
+    void setEffectColor(const QColor& c);
+
+protected:
+    void setUniforms(QGLShaderProgram *program);
+
+private:
+    QColor color;
+};
+
+#endif // CUSTOMSHADEREFFECT_H
diff --git a/examples/graphicsview/customshader/main.cpp b/examples/graphicsview/customshader/main.cpp
new file mode 100644
index 0000000..b88a51d
--- /dev/null
+++ b/examples/graphicsview/customshader/main.cpp
@@ -0,0 +1,55 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "blurpicker.h"
+#include <QApplication>
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    BlurPicker blurPicker;
+    blurPicker.setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Application Picker"));
+    blurPicker.setFixedSize(400, 300);
+    blurPicker.show();
+
+    return app.exec();
+}
diff --git a/examples/graphicsview/graphicsview.pro b/examples/graphicsview/graphicsview.pro
index 185c856..4dd0b13 100644
--- a/examples/graphicsview/graphicsview.pro
+++ b/examples/graphicsview/graphicsview.pro
@@ -12,6 +12,7 @@ SUBDIRS       = \
 
 contains(QT_CONFIG, qt3support):SUBDIRS += portedcanvas portedasteroids
 contains(DEFINES, QT_NO_CURSOR): SUBDIRS -= dragdroprobot
+contains(QT_CONFIG, opengl)|contains(QT_CONFIG, opengles2):SUBDIRS += customshader
 
 # install
 target.path = $$[QT_INSTALL_EXAMPLES]/graphicsview