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-rw-r--r--demos/composition/composition.cpp544
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diff --git a/demos/composition/composition.cpp b/demos/composition/composition.cpp
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+++ 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);
+}
+
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