qt 6.5.1 original

tests/manual/examples/opengl/paintedwindow/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(paintedwindow LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/opengl/paintedwindow")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui OpenGL)
+
+qt_standard_project_setup()
+
+qt_add_executable(paintedwindow
+    main.cpp
+    paintedwindow.cpp paintedwindow.h
+)
+
+set_target_properties(paintedwindow PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(paintedwindow PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::OpenGL
+)
+
+install(TARGETS paintedwindow
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

tests/manual/examples/opengl/paintedwindow/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QGuiApplication>
+#include <QRect>
+
+#include "paintedwindow.h"
+
+int main(int argc, char **argv)
+{
+    QGuiApplication app(argc, argv);
+
+    PaintedWindow window;
+    window.show();
+
+    return app.exec();
+}
+

tests/manual/examples/opengl/paintedwindow/paintedwindow.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "paintedwindow.h"
+
+#include <QGuiApplication>
+#include <QOpenGLContext>
+#include <QOpenGLPaintDevice>
+#include <QPainter>
+#include <QPainterPath>
+#include <QScreen>
+#include <QTimer>
+
+#include <qmath.h>
+
+PaintedWindow::PaintedWindow()
+{
+    QSurfaceFormat format;
+    format.setStencilBufferSize(8);
+    format.setSamples(4);
+
+    setSurfaceType(QWindow::OpenGLSurface);
+    setFlags(Qt::Window | Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint);
+    setFormat(format);
+
+    create();
+
+    m_context = new QOpenGLContext(this);
+    m_context->setFormat(format);
+    m_context->create();
+
+    m_animation = new QPropertyAnimation(this, "rotation");
+    m_animation->setStartValue(qreal(0));
+    m_animation->setEndValue(qreal(1));
+    m_animation->setDuration(500);
+
+    QRect screenGeometry = screen()->availableGeometry();
+
+    QPoint center = screenGeometry.center();
+    QRect windowRect = screen()->isLandscape(screen()->orientation()) ? QRect(0, 0, 640, 480) : QRect(0, 0, 480, 640);
+    setGeometry(QRect(center - windowRect.center(), windowRect.size()));
+
+    m_rotation = 0;
+
+    reportContentOrientationChange(screen()->orientation());
+
+    m_targetOrientation = contentOrientation();
+    m_nextTargetOrientation = Qt::PrimaryOrientation;
+
+    connect(screen(), &QScreen::orientationChanged, this, &PaintedWindow::orientationChanged);
+    connect(m_animation, &QAbstractAnimation::finished, this, &PaintedWindow::rotationDone);
+    connect(this, &PaintedWindow::rotationChanged, this, QOverload<>::of(&PaintedWindow::paint));
+}
+
+void PaintedWindow::exposeEvent(QExposeEvent *)
+{
+    if (isExposed())
+        paint();
+}
+
+void PaintedWindow::mousePressEvent(QMouseEvent *)
+{
+    Qt::ScreenOrientation o = contentOrientation();
+    switch (o) {
+    case Qt::LandscapeOrientation:
+        orientationChanged(Qt::PortraitOrientation);
+        break;
+    case Qt::PortraitOrientation:
+        orientationChanged(Qt::InvertedLandscapeOrientation);
+        break;
+    case Qt::InvertedLandscapeOrientation:
+        orientationChanged(Qt::InvertedPortraitOrientation);
+        break;
+    case Qt::InvertedPortraitOrientation:
+        orientationChanged(Qt::LandscapeOrientation);
+        break;
+    default:
+        Q_ASSERT(false);
+    }
+
+    paint();
+}
+
+void PaintedWindow::orientationChanged(Qt::ScreenOrientation newOrientation)
+{
+    if (contentOrientation() == newOrientation)
+        return;
+
+    if (m_animation->state() == QAbstractAnimation::Running) {
+        m_nextTargetOrientation = newOrientation;
+        return;
+    }
+
+    QRect rect(0, 0, width(), height());
+
+    m_prevImage = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);
+    m_nextImage = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);
+    m_prevImage.fill(0);
+    m_nextImage.fill(0);
+
+    QPainter p;
+    p.begin(&m_prevImage);
+    p.setTransform(screen()->transformBetween(contentOrientation(), screen()->orientation(), rect));
+    paint(&p, screen()->mapBetween(contentOrientation(), screen()->orientation(), rect));
+    p.end();
+
+    p.begin(&m_nextImage);
+    p.setTransform(screen()->transformBetween(newOrientation, screen()->orientation(), rect));
+    paint(&p, screen()->mapBetween(newOrientation, screen()->orientation(), rect));
+    p.end();
+
+    m_deltaRotation = screen()->angleBetween(newOrientation, contentOrientation());
+    if (m_deltaRotation > 180)
+        m_deltaRotation = 180 - m_deltaRotation;
+
+    m_targetOrientation = newOrientation;
+    m_animation->start();
+}
+
+void PaintedWindow::rotationDone()
+{
+    reportContentOrientationChange(m_targetOrientation);
+    if (m_nextTargetOrientation != Qt::PrimaryOrientation) {
+        Q_ASSERT(m_animation->state() != QAbstractAnimation::Running);
+        orientationChanged(m_nextTargetOrientation);
+        m_nextTargetOrientation = Qt::PrimaryOrientation;
+    }
+}
+
+void PaintedWindow::setRotation(qreal r)
+{
+    if (r != m_rotation) {
+        m_rotation = r;
+        emit rotationChanged(r);
+    }
+}
+
+void PaintedWindow::paint()
+{
+    m_context->makeCurrent(this);
+
+    QRect rect(0, 0, width() * devicePixelRatio(), height() * devicePixelRatio());
+
+    QOpenGLPaintDevice device(size() * devicePixelRatio());
+    QPainter painter(&device);
+
+    QPainterPath path;
+    path.addEllipse(rect);
+    painter.setCompositionMode(QPainter::CompositionMode_Source);
+    painter.fillRect(rect, Qt::transparent);
+    painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
+    painter.fillPath(path, Qt::blue);
+
+    if (contentOrientation() != m_targetOrientation) {
+        painter.setRenderHint(QPainter::SmoothPixmapTransform);
+        painter.save();
+        painter.translate(width() / 2, height() / 2);
+        painter.rotate(m_deltaRotation * m_rotation);
+        painter.translate(-width() / 2, -height() / 2);
+        painter.drawImage(0, 0, m_prevImage);
+        painter.restore();
+        painter.translate(width() / 2, height() / 2);
+        painter.rotate(m_deltaRotation * m_rotation - m_deltaRotation);
+        painter.translate(-width() / 2, -height() / 2);
+        painter.setOpacity(m_rotation);
+        painter.drawImage(0, 0, m_nextImage);
+    } else {
+        QRect mapped = screen()->mapBetween(contentOrientation(), screen()->orientation(), rect);
+
+        painter.setTransform(screen()->transformBetween(contentOrientation(), screen()->orientation(), rect));
+        paint(&painter, mapped);
+        painter.end();
+    }
+
+    m_context->swapBuffers(this);
+}
+
+void PaintedWindow::paint(QPainter *painter, const QRect &rect)
+{
+    painter->setRenderHint(QPainter::Antialiasing);
+    QFont font;
+    font.setPixelSize(64);
+    painter->setFont(font);
+    painter->drawText(rect, Qt::AlignCenter, "Hello");
+}

tests/manual/examples/opengl/paintedwindow/paintedwindow.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef PAINTEDWINDOW_H
+#define PAINTEDWINDOW_H
+
+#include <QWindow>
+
+#include <QtGui/qopengl.h>
+#include <QtOpenGL/qopenglshaderprogram.h>
+#include <QtOpenGL/qopenglframebufferobject.h>
+
+#include <QPropertyAnimation>
+
+#include <QColor>
+#include <QImage>
+#include <QTime>
+
+QT_BEGIN_NAMESPACE
+class QOpenGLContext;
+QT_END_NAMESPACE
+
+class PaintedWindow : public QWindow
+{
+    Q_OBJECT
+    Q_PROPERTY(qreal rotation READ rotation WRITE setRotation NOTIFY rotationChanged)
+
+public:
+    PaintedWindow();
+
+    qreal rotation() const { return m_rotation; }
+
+signals:
+    void rotationChanged(qreal rotation);
+
+private slots:
+    void paint();
+    void setRotation(qreal r);
+    void orientationChanged(Qt::ScreenOrientation newOrientation);
+    void rotationDone();
+
+private:
+    void exposeEvent(QExposeEvent *) override;
+    void mousePressEvent(QMouseEvent *) override;
+
+    void paint(QPainter *painter, const QRect &rect);
+
+    QOpenGLContext *m_context;
+    qreal m_rotation;
+
+    QImage m_prevImage;
+    QImage m_nextImage;
+    qreal m_deltaRotation;
+
+    Qt::ScreenOrientation m_targetOrientation;
+    Qt::ScreenOrientation m_nextTargetOrientation;
+
+    QPropertyAnimation *m_animation;
+    QTimer *m_paintTimer;
+};
+
+#endif // PAINTEDWINDOW_H

tests/manual/examples/opengl/paintedwindow/paintedwindow.pro

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+QT += opengl
+
+HEADERS += paintedwindow.h
+SOURCES += paintedwindow.cpp main.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/paintedwindow
+INSTALLS += target