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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 544 insertions, 0 deletions

diff --git a/demos/composition/composition.cpp b/demos/composition/composition.cpp
new file mode 100644
index 0000000000..15f5529611
--- /dev/null
+++ b/demos/composition/composition.cpp
@@ -0,0 +1,544 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "composition.h"
+#include <QBoxLayout>
+#include <QRadioButton>
+#include <QTimer>
+#include <QDateTime>
+#include <QSlider>
+#include <QMouseEvent>
+#include <qmath.h>
+
+const int animationInterval = 15; // update every 16 ms = ~60FPS
+
+CompositionWidget::CompositionWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    CompositionRenderer *view = new CompositionRenderer(this);
+
+    QGroupBox *mainGroup = new QGroupBox(parent);
+    mainGroup->setTitle(tr("Composition Modes"));
+
+    QGroupBox *modesGroup = new QGroupBox(mainGroup);
+    modesGroup->setTitle(tr("Mode"));
+
+    rbClear = new QRadioButton(tr("Clear"), modesGroup);
+    connect(rbClear, SIGNAL(clicked()), view, SLOT(setClearMode()));
+    rbSource = new QRadioButton(tr("Source"), modesGroup);
+    connect(rbSource, SIGNAL(clicked()), view, SLOT(setSourceMode()));
+    rbDest = new QRadioButton(tr("Destination"), modesGroup);
+    connect(rbDest, SIGNAL(clicked()), view, SLOT(setDestMode()));
+    rbSourceOver = new QRadioButton(tr("Source Over"), modesGroup);
+    connect(rbSourceOver, SIGNAL(clicked()), view, SLOT(setSourceOverMode()));
+    rbDestOver = new QRadioButton(tr("Destination Over"), modesGroup);
+    connect(rbDestOver, SIGNAL(clicked()), view, SLOT(setDestOverMode()));
+    rbSourceIn = new QRadioButton(tr("Source In"), modesGroup);
+    connect(rbSourceIn, SIGNAL(clicked()), view, SLOT(setSourceInMode()));
+    rbDestIn = new QRadioButton(tr("Dest In"), modesGroup);
+    connect(rbDestIn, SIGNAL(clicked()), view, SLOT(setDestInMode()));
+    rbSourceOut = new QRadioButton(tr("Source Out"), modesGroup);
+    connect(rbSourceOut, SIGNAL(clicked()), view, SLOT(setSourceOutMode()));
+    rbDestOut = new QRadioButton(tr("Dest Out"), modesGroup);
+    connect(rbDestOut, SIGNAL(clicked()), view, SLOT(setDestOutMode()));
+    rbSourceAtop = new QRadioButton(tr("Source Atop"), modesGroup);
+    connect(rbSourceAtop, SIGNAL(clicked()), view, SLOT(setSourceAtopMode()));
+    rbDestAtop = new QRadioButton(tr("Dest Atop"), modesGroup);
+    connect(rbDestAtop, SIGNAL(clicked()), view, SLOT(setDestAtopMode()));
+    rbXor = new QRadioButton(tr("Xor"), modesGroup);
+    connect(rbXor, SIGNAL(clicked()), view, SLOT(setXorMode()));
+
+    rbPlus = new QRadioButton(tr("Plus"), modesGroup);
+    connect(rbPlus, SIGNAL(clicked()), view, SLOT(setPlusMode()));
+    rbMultiply = new QRadioButton(tr("Multiply"), modesGroup);
+    connect(rbMultiply, SIGNAL(clicked()), view, SLOT(setMultiplyMode()));
+    rbScreen = new QRadioButton(tr("Screen"), modesGroup);
+    connect(rbScreen, SIGNAL(clicked()), view, SLOT(setScreenMode()));
+    rbOverlay = new QRadioButton(tr("Overlay"), modesGroup);
+    connect(rbOverlay, SIGNAL(clicked()), view, SLOT(setOverlayMode()));
+    rbDarken = new QRadioButton(tr("Darken"), modesGroup);
+    connect(rbDarken, SIGNAL(clicked()), view, SLOT(setDarkenMode()));
+    rbLighten = new QRadioButton(tr("Lighten"), modesGroup);
+    connect(rbLighten, SIGNAL(clicked()), view, SLOT(setLightenMode()));
+    rbColorDodge = new QRadioButton(tr("Color Dodge"), modesGroup);
+    connect(rbColorDodge, SIGNAL(clicked()), view, SLOT(setColorDodgeMode()));
+    rbColorBurn = new QRadioButton(tr("Color Burn"), modesGroup);
+    connect(rbColorBurn, SIGNAL(clicked()), view, SLOT(setColorBurnMode()));
+    rbHardLight = new QRadioButton(tr("Hard Light"), modesGroup);
+    connect(rbHardLight, SIGNAL(clicked()), view, SLOT(setHardLightMode()));
+    rbSoftLight = new QRadioButton(tr("Soft Light"), modesGroup);
+    connect(rbSoftLight, SIGNAL(clicked()), view, SLOT(setSoftLightMode()));
+    rbDifference = new QRadioButton(tr("Difference"), modesGroup);
+    connect(rbDifference, SIGNAL(clicked()), view, SLOT(setDifferenceMode()));
+    rbExclusion = new QRadioButton(tr("Exclusion"), modesGroup);
+    connect(rbExclusion, SIGNAL(clicked()), view, SLOT(setExclusionMode()));
+
+    QGroupBox *circleColorGroup = new QGroupBox(mainGroup);
+    circleColorGroup->setTitle(tr("Circle color"));
+    QSlider *circleColorSlider = new QSlider(Qt::Horizontal, circleColorGroup);
+    circleColorSlider->setRange(0, 359);
+    circleColorSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
+    connect(circleColorSlider, SIGNAL(valueChanged(int)), view, SLOT(setCircleColor(int)));
+
+    QGroupBox *circleAlphaGroup = new QGroupBox(mainGroup);
+    circleAlphaGroup->setTitle(tr("Circle alpha"));
+    QSlider *circleAlphaSlider = new QSlider(Qt::Horizontal, circleAlphaGroup);
+    circleAlphaSlider->setRange(0, 255);
+    circleAlphaSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
+    connect(circleAlphaSlider, SIGNAL(valueChanged(int)), view, SLOT(setCircleAlpha(int)));
+
+    QPushButton *showSourceButton = new QPushButton(mainGroup);
+    showSourceButton->setText(tr("Show Source"));
+#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
+    QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
+    enableOpenGLButton->setText(tr("Use OpenGL"));
+    enableOpenGLButton->setCheckable(true);
+    enableOpenGLButton->setChecked(view->usesOpenGL());
+
+    if (!QGLFormat::hasOpenGL() || !QGLPixelBuffer::hasOpenGLPbuffers())
+        enableOpenGLButton->hide();
+#endif
+    QPushButton *whatsThisButton = new QPushButton(mainGroup);
+    whatsThisButton->setText(tr("What's This?"));
+    whatsThisButton->setCheckable(true);
+
+    QPushButton *animateButton = new QPushButton(mainGroup);
+    animateButton->setText(tr("Animated"));
+    animateButton->setCheckable(true);
+    animateButton->setChecked(true);
+
+    QHBoxLayout *viewLayout = new QHBoxLayout(this);
+    viewLayout->addWidget(view);
+    viewLayout->addWidget(mainGroup);
+
+    QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
+    mainGroupLayout->addWidget(circleColorGroup);
+    mainGroupLayout->addWidget(circleAlphaGroup);
+    mainGroupLayout->addWidget(modesGroup);
+    mainGroupLayout->addStretch();
+    mainGroupLayout->addWidget(animateButton);
+    mainGroupLayout->addWidget(whatsThisButton);
+    mainGroupLayout->addWidget(showSourceButton);
+#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
+    mainGroupLayout->addWidget(enableOpenGLButton);
+#endif
+
+    QGridLayout *modesLayout = new QGridLayout(modesGroup);
+    modesLayout->addWidget(rbClear,             0,      0);
+    modesLayout->addWidget(rbSource,            1,      0);
+    modesLayout->addWidget(rbDest,              2,      0);
+    modesLayout->addWidget(rbSourceOver,        3,      0);
+    modesLayout->addWidget(rbDestOver,          4,      0);
+    modesLayout->addWidget(rbSourceIn,          5,      0);
+    modesLayout->addWidget(rbDestIn,            6,      0);
+    modesLayout->addWidget(rbSourceOut,         7,      0);
+    modesLayout->addWidget(rbDestOut,           8,      0);
+    modesLayout->addWidget(rbSourceAtop,        9,      0);
+    modesLayout->addWidget(rbDestAtop,         10,      0);
+    modesLayout->addWidget(rbXor,              11,      0);
+
+    modesLayout->addWidget(rbPlus,              0,      1);
+    modesLayout->addWidget(rbMultiply,          1,      1);
+    modesLayout->addWidget(rbScreen,            2,      1);
+    modesLayout->addWidget(rbOverlay,           3,      1);
+    modesLayout->addWidget(rbDarken,            4,      1);
+    modesLayout->addWidget(rbLighten,           5,      1);
+    modesLayout->addWidget(rbColorDodge,        6,      1);
+    modesLayout->addWidget(rbColorBurn,         7,      1);
+    modesLayout->addWidget(rbHardLight,         8,      1);
+    modesLayout->addWidget(rbSoftLight,         9,      1);
+    modesLayout->addWidget(rbDifference,       10,      1);
+    modesLayout->addWidget(rbExclusion,        11,      1);
+
+
+    QVBoxLayout *circleColorLayout = new QVBoxLayout(circleColorGroup);
+    circleColorLayout->addWidget(circleColorSlider);
+
+    QVBoxLayout *circleAlphaLayout = new QVBoxLayout(circleAlphaGroup);
+    circleAlphaLayout->addWidget(circleAlphaSlider);
+
+    view->loadDescription(":res/composition/composition.html");
+    view->loadSourceFile(":res/composition/composition.cpp");
+
+    connect(whatsThisButton, SIGNAL(clicked(bool)), view, SLOT(setDescriptionEnabled(bool)));
+    connect(view, SIGNAL(descriptionEnabledChanged(bool)), whatsThisButton, SLOT(setChecked(bool)));
+    connect(showSourceButton, SIGNAL(clicked()), view, SLOT(showSource()));
+#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
+    connect(enableOpenGLButton, SIGNAL(clicked(bool)), view, SLOT(enableOpenGL(bool)));
+#endif
+    connect(animateButton, SIGNAL(toggled(bool)), view, SLOT(setAnimationEnabled(bool)));
+
+    circleColorSlider->setValue(270);
+    circleAlphaSlider->setValue(200);
+    rbSourceOut->animateClick();
+
+    setWindowTitle(tr("Composition Modes"));
+}
+
+
+void CompositionWidget::nextMode()
+{
+    /*
+      if (!m_animation_enabled)
+      return;
+      if (rbClear->isChecked()) rbSource->animateClick();
+      if (rbSource->isChecked()) rbDest->animateClick();
+      if (rbDest->isChecked()) rbSourceOver->animateClick();
+      if (rbSourceOver->isChecked()) rbDestOver->animateClick();
+      if (rbDestOver->isChecked()) rbSourceIn->animateClick();
+      if (rbSourceIn->isChecked()) rbDestIn->animateClick();
+      if (rbDestIn->isChecked()) rbSourceOut->animateClick();
+      if (rbSourceOut->isChecked()) rbDestOut->animateClick();
+      if (rbDestOut->isChecked()) rbSourceAtop->animateClick();
+      if (rbSourceAtop->isChecked()) rbDestAtop->animateClick();
+      if (rbDestAtop->isChecked()) rbXor->animateClick();
+      if (rbXor->isChecked()) rbClear->animateClick();
+    */
+}
+
+CompositionRenderer::CompositionRenderer(QWidget *parent)
+    : ArthurFrame(parent)
+{
+    m_animation_enabled = true;
+    m_animationTimer = startTimer(animationInterval);
+#ifdef Q_WS_QWS
+    m_image = QPixmap(":res/composition/flower.jpg");
+    m_image.setAlphaChannel(QPixmap(":res/composition/flower_alpha.jpg"));
+#else
+    m_image = QImage(":res/composition/flower.jpg");
+    m_image.setAlphaChannel(QImage(":res/composition/flower_alpha.jpg"));
+#endif
+    m_circle_alpha = 127;
+    m_circle_hue = 255;
+    m_current_object = NoObject;
+    m_composition_mode = QPainter::CompositionMode_SourceOut;
+
+    m_circle_pos = QPoint(200, 100);
+
+    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+#ifdef QT_OPENGL_SUPPORT
+    m_pbuffer = 0;
+    m_pbuffer_size = 1024;
+#endif
+}
+
+QRectF rectangle_around(const QPointF &p, const QSizeF &size = QSize(250, 200))
+{
+    QRectF rect(p, size);
+    rect.translate(-size.width()/2, -size.height()/2);
+    return rect;
+}
+
+void CompositionRenderer::setAnimationEnabled(bool enabled)
+{
+    if (m_animation_enabled == enabled)
+        return;
+    m_animation_enabled = enabled;
+    if (enabled) {
+        Q_ASSERT(!m_animationTimer);
+        m_animationTimer = startTimer(animationInterval);
+    } else {
+        killTimer(m_animationTimer);
+        m_animationTimer = 0;
+    }
+}
+
+void CompositionRenderer::updateCirclePos()
+{
+    if (m_current_object != NoObject)
+        return;
+    QDateTime dt = QDateTime::currentDateTime();
+    qreal t = (dt.toTime_t() * 1000 + dt.time().msec()) / 1000.0;
+
+    qreal x = width() / qreal(2) + (qCos(t*8/11) + qSin(-t)) * width() / qreal(4);
+    qreal y = height() / qreal(2) + (qSin(t*6/7) + qCos(t * qreal(1.5))) * height() / qreal(4);
+
+    setCirclePos(QLineF(m_circle_pos, QPointF(x, y)).pointAt(0.02));
+}
+
+void CompositionRenderer::drawBase(QPainter &p)
+{
+    p.setPen(Qt::NoPen);
+
+    QLinearGradient rect_gradient(0, 0, 0, height());
+    rect_gradient.setColorAt(0, Qt::red);
+    rect_gradient.setColorAt(.17, Qt::yellow);
+    rect_gradient.setColorAt(.33, Qt::green);
+    rect_gradient.setColorAt(.50, Qt::cyan);
+    rect_gradient.setColorAt(.66, Qt::blue);
+    rect_gradient.setColorAt(.81, Qt::magenta);
+    rect_gradient.setColorAt(1, Qt::red);
+    p.setBrush(rect_gradient);
+    p.drawRect(width() / 2, 0, width() / 2, height());
+
+    QLinearGradient alpha_gradient(0, 0, width(), 0);
+    alpha_gradient.setColorAt(0, Qt::white);
+    alpha_gradient.setColorAt(0.2, Qt::white);
+    alpha_gradient.setColorAt(0.5, Qt::transparent);
+    alpha_gradient.setColorAt(0.8, Qt::white);
+    alpha_gradient.setColorAt(1, Qt::white);
+
+    p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
+    p.setBrush(alpha_gradient);
+    p.drawRect(0, 0, width(), height());
+
+    p.setCompositionMode(QPainter::CompositionMode_DestinationOver);
+
+    p.setPen(Qt::NoPen);
+    p.setRenderHint(QPainter::SmoothPixmapTransform);
+#ifdef Q_WS_QWS
+    p.drawPixmap(rect(), m_image);
+#else
+    p.drawImage(rect(), m_image);
+#endif
+}
+
+void CompositionRenderer::drawSource(QPainter &p)
+{
+    p.setPen(Qt::NoPen);
+    p.setRenderHint(QPainter::Antialiasing);
+    p.setCompositionMode(m_composition_mode);
+
+    QRectF circle_rect = rectangle_around(m_circle_pos);
+    QColor color = QColor::fromHsvF(m_circle_hue / 360.0, 1, 1, m_circle_alpha / 255.0);
+    QLinearGradient circle_gradient(circle_rect.topLeft(), circle_rect.bottomRight());
+    circle_gradient.setColorAt(0, color.light());
+    circle_gradient.setColorAt(0.5, color);
+    circle_gradient.setColorAt(1, color.dark());
+    p.setBrush(circle_gradient);
+
+    p.drawEllipse(circle_rect);
+}
+
+void CompositionRenderer::paint(QPainter *painter)
+{
+#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
+    if (usesOpenGL()) {
+
+        int new_pbuf_size = m_pbuffer_size;
+        if (size().width() > m_pbuffer_size ||
+            size().height() > m_pbuffer_size)
+            new_pbuf_size *= 2;
+
+        if (size().width() < m_pbuffer_size/2 &&
+            size().height() < m_pbuffer_size/2)
+            new_pbuf_size /= 2;
+
+        if (!m_pbuffer || new_pbuf_size != m_pbuffer_size) {
+            if (m_pbuffer) {
+                m_pbuffer->deleteTexture(m_base_tex);
+                m_pbuffer->deleteTexture(m_compositing_tex);
+                delete m_pbuffer;
+            }
+
+            m_pbuffer = new QGLPixelBuffer(QSize(new_pbuf_size, new_pbuf_size), QGLFormat::defaultFormat(), glWidget());
+            m_pbuffer->makeCurrent();
+            m_base_tex = m_pbuffer->generateDynamicTexture();
+            m_compositing_tex = m_pbuffer->generateDynamicTexture();
+            m_pbuffer_size = new_pbuf_size;
+        }
+
+        if (size() != m_previous_size) {
+            m_previous_size = size();
+            QPainter p(m_pbuffer);
+            p.setCompositionMode(QPainter::CompositionMode_Source);
+            p.fillRect(QRect(0, 0, m_pbuffer->width(), m_pbuffer->height()), Qt::transparent);
+            drawBase(p);
+            p.end();
+            m_pbuffer->updateDynamicTexture(m_base_tex);
+        }
+
+        qreal x_fraction = width()/float(m_pbuffer->width());
+        qreal y_fraction = height()/float(m_pbuffer->height());
+
+        {
+            QPainter p(m_pbuffer);
+            p.setCompositionMode(QPainter::CompositionMode_Source);
+            p.fillRect(QRect(0, 0, m_pbuffer->width(), m_pbuffer->height()), Qt::transparent);
+
+            p.save(); // Needed when using the GL1 engine
+            p.beginNativePainting(); // Needed when using the GL2 engine
+
+            glBindTexture(GL_TEXTURE_2D, m_base_tex);
+            glEnable(GL_TEXTURE_2D);
+            glColor4f(1.,1.,1.,1.);
+
+            glBegin(GL_QUADS);
+            {
+                glTexCoord2f(0, 1.0);
+                glVertex2f(0, 0);
+
+                glTexCoord2f(x_fraction, 1.0);
+                glVertex2f(width(), 0);
+
+                glTexCoord2f(x_fraction, 1.0-y_fraction);
+                glVertex2f(width(), height());
+
+                glTexCoord2f(0, 1.0-y_fraction);
+                glVertex2f(0, height());
+            }
+            glEnd();
+
+            glDisable(GL_TEXTURE_2D);
+
+            p.endNativePainting(); // Needed when using the GL2 engine
+            p.restore(); // Needed when using the GL1 engine
+
+            drawSource(p);
+            p.end();
+            m_pbuffer->updateDynamicTexture(m_compositing_tex);
+        }
+
+        painter->beginNativePainting(); // Needed when using the GL2 engine
+        glWidget()->makeCurrent(); // Needed when using the GL1 engine
+        glBindTexture(GL_TEXTURE_2D, m_compositing_tex);
+        glEnable(GL_TEXTURE_2D);
+        glEnable(GL_BLEND);
+        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+        glColor4f(1.,1.,1.,1.);
+        glBegin(GL_QUADS);
+        {
+            glTexCoord2f(0, 1.0);
+            glVertex2f(0, 0);
+
+            glTexCoord2f(x_fraction, 1.0);
+            glVertex2f(width(), 0);
+
+            glTexCoord2f(x_fraction, 1.0-y_fraction);
+            glVertex2f(width(), height());
+
+            glTexCoord2f(0, 1.0-y_fraction);
+            glVertex2f(0, height());
+        }
+        glEnd();
+        glDisable(GL_TEXTURE_2D);
+        painter->endNativePainting(); // Needed when using the GL2 engine
+    } else
+#endif
+    {
+        // using a QImage
+        if (m_buffer.size() != size()) {
+#ifdef Q_WS_QWS
+            m_base_buffer = QPixmap(size());
+            m_base_buffer.fill(Qt::transparent);
+#else
+            m_buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied);
+            m_base_buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied);
+
+            m_base_buffer.fill(0);
+#endif
+
+            QPainter p(&m_base_buffer);
+
+            drawBase(p);
+        }
+
+#ifdef Q_WS_QWS
+        m_buffer = m_base_buffer;
+#else
+        memcpy(m_buffer.bits(), m_base_buffer.bits(), m_buffer.byteCount());
+#endif
+
+        {
+            QPainter p(&m_buffer);
+            drawSource(p);
+        }
+
+#ifdef Q_WS_QWS
+        painter->drawPixmap(0, 0, m_buffer);
+#else
+        painter->drawImage(0, 0, m_buffer);
+#endif
+    }
+}
+
+void CompositionRenderer::mousePressEvent(QMouseEvent *e)
+{
+    setDescriptionEnabled(false);
+
+    QRectF circle = rectangle_around(m_circle_pos);
+
+    if (circle.contains(e->pos())) {
+        m_current_object = Circle;
+        m_offset = circle.center() - e->pos();
+    } else {
+        m_current_object = NoObject;
+    }
+    if (m_animation_enabled) {
+        killTimer(m_animationTimer);
+        m_animationTimer = 0;
+    }
+}
+
+void CompositionRenderer::mouseMoveEvent(QMouseEvent *e)
+{
+    if (m_current_object == Circle) setCirclePos(e->pos() + m_offset);
+}
+
+void CompositionRenderer::mouseReleaseEvent(QMouseEvent *)
+{
+    m_current_object = NoObject;
+
+    if (m_animation_enabled) {
+        Q_ASSERT(!m_animationTimer);
+        m_animationTimer = startTimer(animationInterval);
+    }
+}
+
+void CompositionRenderer::timerEvent(QTimerEvent *event)
+{
+    if (event->timerId() == m_animationTimer)
+        updateCirclePos();
+}
+
+void CompositionRenderer::setCirclePos(const QPointF &pos)
+{
+    const QRect oldRect = rectangle_around(m_circle_pos).toAlignedRect();
+    m_circle_pos = pos;
+    const QRect newRect = rectangle_around(m_circle_pos).toAlignedRect();
+#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
+    if (usesOpenGL())
+        update();
+    else
+#endif
+        update(oldRect | newRect);
+}
+