qquickwindow.cpp

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qquickwindow.h"
#include "qquickwindow_p.h"
 
#include "qquickitem.h"
#include "qquickitem_p.h"
#include "qquickevents_p_p.h"
#include "qquickgraphicsdevice_p.h"
 
#include <QtQuick/private/qsgrenderer_p.h>
#include <QtQuick/private/qsgplaintexture_p.h>
#include <QtQuick/private/qquickpointerhandler_p.h>
#include <private/qsgrenderloop_p.h>
#include <private/qsgrhisupport_p.h>
#include <private/qquickrendercontrol_p.h>
#include <private/qquickanimatorcontroller_p.h>
#include <private/qquickprofiler_p.h>
#include <private/qquicktextinterface_p.h>
 
#include <private/qguiapplication_p.h>
 
#include <private/qabstractanimation_p.h>
 
#include <QtGui/qpainter.h>
#include <QtGui/qevent.h>
#include <QtGui/qmatrix4x4.h>
#include <QtGui/private/qevent_p.h>
#include <QtGui/private/qpointingdevice_p.h>
#include <QtCore/qvarlengtharray.h>
#include <QtCore/qabstractanimation.h>
#include <QtCore/QLibraryInfo>
#include <QtCore/QRunnable>
#include <QtQml/qqmlincubator.h>
#include <QtQml/qqmlinfo.h>
#include <QtQml/private/qqmlmetatype_p.h>
 
#include <QtQuick/private/qquickpixmapcache_p.h>
 
#include <private/qqmldebugserviceinterfaces_p.h>
#include <private/qqmldebugconnector_p.h>
#include <private/qsgdefaultrendercontext_p.h>
#if QT_CONFIG(opengl)
#include <private/qopengl_p.h>
#include <QOpenGLContext>
#endif
#ifndef QT_NO_DEBUG_STREAM
#include <private/qdebug_p.h>
#endif
 
#include <rhi/qrhi.h>
 
QT_BEGIN_NAMESPACE
 
Q_DECLARE_LOGGING_CATEGORY(lcHoverTrace)
Q_DECLARE_LOGGING_CATEGORY(lcMouse)
Q_DECLARE_LOGGING_CATEGORY(lcTouch)
Q_DECLARE_LOGGING_CATEGORY(lcPtr)
Q_LOGGING_CATEGORY(lcDirty, "qt.quick.dirty")
Q_LOGGING_CATEGORY(lcTransient, "qt.quick.window.transient")
 
bool QQuickWindowPrivate::defaultAlphaBuffer = false;
 
#if defined(QT_QUICK_DEFAULT_TEXT_RENDER_TYPE)
QQuickWindow::TextRenderType QQuickWindowPrivate::textRenderType = QQuickWindow::QT_QUICK_DEFAULT_TEXT_RENDER_TYPE;
#else
QQuickWindow::TextRenderType QQuickWindowPrivate::textRenderType = QQuickWindow::QtTextRendering;
#endif
 
class QQuickWindowIncubationController : public QObject, public QQmlIncubationController
{
    Q_OBJECT
 
public:
    QQuickWindowIncubationController(QSGRenderLoop *loop)
        : m_renderLoop(loop), m_timer(0)
    {
        // Allow incubation for 1/3 of a frame.
        m_incubation_time = qMax(1, int(1000 / QGuiApplication::primaryScreen()->refreshRate()) / 3);
 
        QAnimationDriver *animationDriver = m_renderLoop->animationDriver();
        if (animationDriver) {
            connect(animationDriver, &QAnimationDriver::stopped, this, &QQuickWindowIncubationController::animationStopped);
            connect(m_renderLoop, &QSGRenderLoop::timeToIncubate, this, &QQuickWindowIncubationController::incubate);
        }
    }
 
protected:
    void timerEvent(QTimerEvent *) override
    {
        killTimer(m_timer);
        m_timer = 0;
        incubate();
    }
 
    void incubateAgain() {
        if (m_timer == 0) {
            // Wait for a while before processing the next batch. Using a
            // timer to avoid starvation of system events.
            m_timer = startTimer(m_incubation_time);
        }
    }
 
public slots:
    void incubate() {
        if (m_renderLoop && incubatingObjectCount()) {
            if (m_renderLoop->interleaveIncubation()) {
                incubateFor(m_incubation_time);
            } else {
                incubateFor(m_incubation_time * 2);
                if (incubatingObjectCount())
                    incubateAgain();
            }
        }
    }
 
    void animationStopped() { incubate(); }
 
protected:
    void incubatingObjectCountChanged(int count) override
    {
        if (count && m_renderLoop && !m_renderLoop->interleaveIncubation())
            incubateAgain();
    }
 
private:
    QPointer<QSGRenderLoop> m_renderLoop;
    int m_incubation_time;
    int m_timer;
};
 
#if QT_CONFIG(accessibility)
QAccessibleInterface *QQuickWindow::accessibleRoot() const
{
    return QAccessible::queryAccessibleInterface(const_cast<QQuickWindow*>(this));
}
#endif
 
 
/*
Focus behavior
==============
 
Prior to being added to a valid window items can set and clear focus with no
effect.  Only once items are added to a window (by way of having a parent set that
already belongs to a window) do the focus rules apply.  Focus goes back to
having no effect if an item is removed from a window.
 
When an item is moved into a new focus scope (either being added to a window
for the first time, or having its parent changed), if the focus scope already has
a scope focused item that takes precedence over the item being added.  Otherwise,
the focus of the added tree is used.  In the case of a tree of items being
added to a window for the first time, which may have a conflicted focus state (two
or more items in one scope having focus set), the same rule is applied item by item -
thus the first item that has focus will get it (assuming the scope doesn't already
have a scope focused item), and the other items will have their focus cleared.
*/
 
QQuickRootItem::QQuickRootItem()
{
    // child items with ItemObservesViewport can treat the window's content item
    // as the ultimate viewport: avoid populating SG nodes that fall outside
    setFlag(ItemIsViewport);
}
 
void QQuickWindow::exposeEvent(QExposeEvent *)
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->exposureChanged(this);
}
 
void QQuickWindow::resizeEvent(QResizeEvent *ev)
{
    Q_D(QQuickWindow);
    if (d->contentItem)
        d->contentItem->setSize(ev->size());
    if (d->windowManager)
        d->windowManager->resize(this);
}
 
void QQuickWindow::showEvent(QShowEvent *)
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->show(this);
}
 
void QQuickWindow::hideEvent(QHideEvent *)
{
    Q_D(QQuickWindow);
    if (auto da = d->deliveryAgentPrivate())
        da->handleWindowHidden(this);
    if (d->windowManager)
        d->windowManager->hide(this);
}
 
void QQuickWindow::closeEvent(QCloseEvent *e)
{
    QQuickCloseEvent qev;
    qev.setAccepted(e->isAccepted());
    emit closing(&qev);
    e->setAccepted(qev.isAccepted());
}
 
void QQuickWindow::focusOutEvent(QFocusEvent *ev)
{
    Q_D(QQuickWindow);
    if (d->contentItem)
        d->contentItem->setFocus(false, ev->reason());
}
 
void QQuickWindow::focusInEvent(QFocusEvent *ev)
{
    Q_D(QQuickWindow);
    if (d->inDestructor)
        return;
    if (d->contentItem)
        d->contentItem->setFocus(true, ev->reason());
    if (auto da = d->deliveryAgentPrivate())
        da->updateFocusItemTransform();
}
 
#if QT_CONFIG(im)
static bool transformDirtyOnItemOrAncestor(const QQuickItem *item)
{
    while (item) {
        if (QQuickItemPrivate::get(item)->dirtyAttributes & (
            QQuickItemPrivate::TransformOrigin |
            QQuickItemPrivate::Transform |
            QQuickItemPrivate::BasicTransform |
            QQuickItemPrivate::Position |
            QQuickItemPrivate::Size |
            QQuickItemPrivate::ParentChanged |
            QQuickItemPrivate::Clip)) {
            return true;
        }
        item = item->parentItem();
    }
    return false;
}
#endif
 
struct PolishLoopDetector
{
    PolishLoopDetector(const QVector<QQuickItem*> &itemsToPolish)
        : itemsToPolish(itemsToPolish)
    {
    }
 
    /*
     * returns true when it detected a likely infinite loop
     * (suggests it should abort the polish loop)
     **/
    bool check(QQuickItem *item, int itemsRemainingBeforeUpdatePolish)
    {
        if (itemsToPolish.size() > itemsRemainingBeforeUpdatePolish) {
            // Detected potential polish loop.
            ++numPolishLoopsInSequence;
            if (numPolishLoopsInSequence >= 1000) {
                // Start to warn about polish loop after 1000 consecutive polish loops
                if (numPolishLoopsInSequence == 100000) {
                    // We have looped 100,000 times without actually reducing the list of items to
                    // polish, give up for now.
                    // This is not a fix, just a remedy so that the application can be somewhat
                    // responsive.
                    numPolishLoopsInSequence = 0;
                    return true;
                } else if (numPolishLoopsInSequence < 1005) {
                    // Show the 5 next items involved in the polish loop.
                    // (most likely they will be the same 5 items...)
                    QQuickItem *guiltyItem = itemsToPolish.last();
                    qmlWarning(item) << "possible QQuickItem::polish() loop";
 
                    auto typeAndObjectName = [](QQuickItem *item) {
                        QString typeName = QQmlMetaType::prettyTypeName(item);
                        QString objName = item->objectName();
                        if (!objName.isNull())
                            return QLatin1String("%1(%2)").arg(typeName, objName);
                        return typeName;
                    };
 
                    qmlWarning(guiltyItem) << typeAndObjectName(guiltyItem)
                               << " called polish() inside updatePolish() of " << typeAndObjectName(item);
 
                    if (numPolishLoopsInSequence == 1004)
                        // Enough warnings. Reset counter in order to speed things up and re-detect
                        // more loops
                        numPolishLoopsInSequence = 0;
                }
            }
        } else {
            numPolishLoopsInSequence = 0;
        }
        return false;
    }
    const QVector<QQuickItem*> &itemsToPolish;      // Just a ref to the one in polishItems()
    int numPolishLoopsInSequence = 0;
};
 
void QQuickWindowPrivate::polishItems()
{
    // An item can trigger polish on another item, or itself for that matter,
    // during its updatePolish() call. Because of this, we cannot simply
    // iterate through the set, we must continue pulling items out until it
    // is empty.
    // In the case where polish is called from updatePolish() either directly
    // or indirectly, we use a PolishLoopDetector to determine if a warning should
    // be printed to the user.
 
    PolishLoopDetector polishLoopDetector(itemsToPolish);
    while (!itemsToPolish.isEmpty()) {
        QQuickItem *item = itemsToPolish.takeLast();
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        itemPrivate->polishScheduled = false;
        const int itemsRemaining = itemsToPolish.size();
        itemPrivate->updatePolish();
        item->updatePolish();
        if (polishLoopDetector.check(item, itemsRemaining) == true)
            break;
    }
 
#if QT_CONFIG(im)
    if (QQuickItem *focusItem = q_func()->activeFocusItem()) {
        // If the current focus item, or any of its anchestors, has changed location
        // inside the window, we need inform IM about it. This to ensure that overlays
        // such as selection handles will be updated.
        const bool isActiveFocusItem = (focusItem == QGuiApplication::focusObject());
        const bool hasImEnabled = focusItem->inputMethodQuery(Qt::ImEnabled).toBool();
        if (isActiveFocusItem && hasImEnabled && transformDirtyOnItemOrAncestor(focusItem))
            deliveryAgentPrivate()->updateFocusItemTransform();
    }
#endif
}
 
void QQuickWindow::update()
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->update(this);
    else if (d->renderControl)
        QQuickRenderControlPrivate::get(d->renderControl)->update();
}
 
static void updatePixelRatioHelper(QQuickItem *item, float pixelRatio)
{
    if (item->flags() & QQuickItem::ItemHasContents) {
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        itemPrivate->itemChange(QQuickItem::ItemDevicePixelRatioHasChanged, pixelRatio);
    }
 
    QList <QQuickItem *> items = item->childItems();
    for (int i = 0; i < items.size(); ++i)
        updatePixelRatioHelper(items.at(i), pixelRatio);
}
 
void QQuickWindow::physicalDpiChanged()
{
    Q_D(QQuickWindow);
    const qreal newPixelRatio = effectiveDevicePixelRatio();
    if (qFuzzyCompare(newPixelRatio, d->lastReportedItemDevicePixelRatio))
        return;
    d->lastReportedItemDevicePixelRatio = newPixelRatio;
    if (d->contentItem)
        updatePixelRatioHelper(d->contentItem, newPixelRatio);
    d->forcePolish();
}
 
void QQuickWindow::handleFontDatabaseChanged()
{
    Q_D(QQuickWindow);
    d->pendingFontUpdate = true;
}
 
void forcePolishHelper(QQuickItem *item)
{
    if (item->flags() & QQuickItem::ItemHasContents) {
        item->polish();
    }
 
    QList <QQuickItem *> items = item->childItems();
    for (int i=0; i<items.size(); ++i)
        forcePolishHelper(items.at(i));
}
 
void QQuickWindow::handleScreenChanged(QScreen *screen)
{
    Q_D(QQuickWindow);
    Q_UNUSED(screen);
    d->forcePolish();
}
 
void QQuickWindowPrivate::forcePolish()
{
    Q_Q(QQuickWindow);
    if (!q->screen())
        return;
    forcePolishHelper(contentItem);
}
 
void forceUpdate(QQuickItem *item)
{
    if (item->flags() & QQuickItem::ItemHasContents)
        item->update();
    QQuickItemPrivate::get(item)->dirty(QQuickItemPrivate::ChildrenUpdateMask);
 
    QList <QQuickItem *> items = item->childItems();
    for (int i=0; i<items.size(); ++i)
        forceUpdate(items.at(i));
}
 
void QQuickWindowRenderTarget::reset(QRhi *rhi)
{
    if (owns) {
        if (rhi) {
            delete renderTarget;
            delete rpDesc;
            delete texture;
            delete renderBuffer;
            delete depthStencil;
        }
 
        delete paintDevice;
    }
 
    renderTarget = nullptr;
    rpDesc = nullptr;
    texture = nullptr;
    renderBuffer = nullptr;
    depthStencil = nullptr;
    paintDevice = nullptr;
    owns = false;
}
 
void QQuickWindowPrivate::invalidateFontData(QQuickItem *item)
{
    QQuickTextInterface *textItem = qobject_cast<QQuickTextInterface *>(item);
    if (textItem != nullptr)
        textItem->invalidate();
 
    QList<QQuickItem *> children = item->childItems();
    for (QQuickItem *child : children)
        invalidateFontData(child);
}
 
void QQuickWindowPrivate::ensureCustomRenderTarget()
{
    // resolve() can be expensive when importing an existing native texture, so
    // it is important to only do it when the QQuickRenderTarget* was really changed
    if (!redirect.renderTargetDirty)
        return;
 
    redirect.renderTargetDirty = false;
 
    redirect.rt.reset(rhi);
 
    // a default constructed QQuickRenderTarget means no redirection
    if (customRenderTarget.isNull())
        return;
 
    QQuickRenderTargetPrivate::get(&customRenderTarget)->resolve(rhi, &redirect.rt);
}
 
void QQuickWindowPrivate::setCustomCommandBuffer(QRhiCommandBuffer *cb)
{
    // ownership not transferred
    redirect.commandBuffer = cb;
}
 
void QQuickWindowPrivate::syncSceneGraph()
{
    Q_Q(QQuickWindow);
 
    ensureCustomRenderTarget();
 
    QRhiCommandBuffer *cb = nullptr;
    if (rhi) {
        if (redirect.commandBuffer)
            cb = redirect.commandBuffer;
        else
            cb = swapchain->currentFrameCommandBuffer();
    }
    context->prepareSync(q->effectiveDevicePixelRatio(), cb, graphicsConfig);
 
    animationController->beforeNodeSync();
 
    emit q->beforeSynchronizing();
    runAndClearJobs(&beforeSynchronizingJobs);
 
    if (pendingFontUpdate) {
        QFont::cleanup();
        invalidateFontData(contentItem);
    }
 
    if (!renderer) {
        forceUpdate(contentItem);
 
        QSGRootNode *rootNode = new QSGRootNode;
        rootNode->appendChildNode(QQuickItemPrivate::get(contentItem)->itemNode());
        const bool useDepth = graphicsConfig.isDepthBufferEnabledFor2D();
        const QSGRendererInterface::RenderMode renderMode = useDepth ? QSGRendererInterface::RenderMode2D
                                                                     : QSGRendererInterface::RenderMode2DNoDepthBuffer;
        renderer = context->createRenderer(renderMode);
        renderer->setRootNode(rootNode);
    }
 
    updateDirtyNodes();
 
    animationController->afterNodeSync();
 
    // Copy the current state of clearing from window into renderer.
    renderer->setClearColor(clearColor);
    // Cannot skip clearing the color buffer in Qt 6 anymore.
    const QSGAbstractRenderer::ClearMode mode = QSGAbstractRenderer::ClearColorBuffer
                                                | QSGAbstractRenderer::ClearStencilBuffer
                                                | QSGAbstractRenderer::ClearDepthBuffer;
    renderer->setClearMode(mode);
 
    renderer->setVisualizationMode(visualizationMode);
 
    if (pendingFontUpdate) {
        context->invalidateGlyphCaches();
        pendingFontUpdate = false;
    }
 
    emit q->afterSynchronizing();
    runAndClearJobs(&afterSynchronizingJobs);
}
 
void QQuickWindowPrivate::emitBeforeRenderPassRecording(void *ud)
{
    QQuickWindow *w = reinterpret_cast<QQuickWindow *>(ud);
    emit w->beforeRenderPassRecording();
}
 
void QQuickWindowPrivate::emitAfterRenderPassRecording(void *ud)
{
    QQuickWindow *w = reinterpret_cast<QQuickWindow *>(ud);
    emit w->afterRenderPassRecording();
}
 
void QQuickWindowPrivate::renderSceneGraph()
{
    Q_Q(QQuickWindow);
    if (!renderer)
        return;
 
    ensureCustomRenderTarget();
 
    QSGRenderTarget sgRenderTarget;
    if (rhi) {
        QRhiRenderTarget *rt;
        QRhiRenderPassDescriptor *rp;
        QRhiCommandBuffer *cb;
        if (redirect.rt.renderTarget) {
            rt = redirect.rt.renderTarget;
            rp = rt->renderPassDescriptor();
            if (!rp) {
                qWarning("Custom render target is set but no renderpass descriptor has been provided.");
                return;
            }
            cb = redirect.commandBuffer;
            if (!cb) {
                qWarning("Custom render target is set but no command buffer has been provided.");
                return;
            }
        } else {
            if (!swapchain) {
                qWarning("QQuickWindow: No render target (neither swapchain nor custom target was provided)");
                return;
            }
            rt = swapchain->currentFrameRenderTarget();
            rp = rpDescForSwapchain;
            cb = swapchain->currentFrameCommandBuffer();
        }
        sgRenderTarget = QSGRenderTarget(rt, rp, cb);
    } else {
        sgRenderTarget = QSGRenderTarget(redirect.rt.paintDevice);
    }
 
    context->beginNextFrame(renderer,
                            sgRenderTarget,
                            emitBeforeRenderPassRecording,
                            emitAfterRenderPassRecording,
                            q);
 
    animationController->advance();
    emit q->beforeRendering();
    runAndClearJobs(&beforeRenderingJobs);
 
    QSGAbstractRenderer::MatrixTransformFlags matrixFlags;
    bool flipY = rhi ? !rhi->isYUpInNDC() : false;
    if (!customRenderTarget.isNull() && customRenderTarget.mirrorVertically())
        flipY = !flipY;
    if (flipY)
        matrixFlags |= QSGAbstractRenderer::MatrixTransformFlipY;
 
    const qreal devicePixelRatio = q->effectiveDevicePixelRatio();
    QSize pixelSize;
    if (redirect.rt.renderTarget)
        pixelSize = redirect.rt.renderTarget->pixelSize();
    else if (redirect.rt.paintDevice)
        pixelSize = QSize(redirect.rt.paintDevice->width(), redirect.rt.paintDevice->height());
    else if (rhi)
        pixelSize = swapchain->currentPixelSize();
    else // software or other backend
        pixelSize = q->size() * devicePixelRatio;
 
    renderer->setDevicePixelRatio(devicePixelRatio);
    renderer->setDeviceRect(QRect(QPoint(0, 0), pixelSize));
    renderer->setViewportRect(QRect(QPoint(0, 0), pixelSize));
    renderer->setProjectionMatrixToRect(QRectF(QPointF(0, 0), pixelSize / devicePixelRatio), matrixFlags);
 
    context->renderNextFrame(renderer);
 
    emit q->afterRendering();
    runAndClearJobs(&afterRenderingJobs);
 
    context->endNextFrame(renderer);
 
    if (renderer && renderer->hasVisualizationModeWithContinuousUpdate()) {
        // For the overdraw visualizer. This update is not urgent so avoid a
        // direct update() call, this is only here to keep the overdraw
        // visualization box rotating even when the scene is static.
        QCoreApplication::postEvent(q, new QEvent(QEvent::Type(FullUpdateRequest)));
    }
}
 
QQuickWindowPrivate::QQuickWindowPrivate()
    : contentItem(nullptr)
    , dirtyItemList(nullptr)
    , lastReportedItemDevicePixelRatio(0)
    , context(nullptr)
    , renderer(nullptr)
    , windowManager(nullptr)
    , renderControl(nullptr)
    , clearColor(Qt::white)
    , persistentGraphics(true)
    , persistentSceneGraph(true)
    , componentCompleted(true)
    , inDestructor(false)
    , incubationController(nullptr)
    , hasActiveSwapchain(false)
    , hasRenderableSwapchain(false)
    , swapchainJustBecameRenderable(false)
    , updatesEnabled(true)
{
}
 
QQuickWindowPrivate::~QQuickWindowPrivate()
{
    inDestructor = true;
    redirect.rt.reset(rhi);
    if (QQmlInspectorService *service = QQmlDebugConnector::service<QQmlInspectorService>())
        service->removeWindow(q_func());
    deliveryAgent = nullptr;
}
 
void QQuickWindowPrivate::updateChildrenPalettes(const QPalette &parentPalette)
{
    Q_Q(QQuickWindow);
    if (auto root = q->contentItem()) {
        for (auto &&child: root->childItems()) {
            QQuickItemPrivate::get(child)->inheritPalette(parentPalette);
        }
    }
}
 
void QQuickWindowPrivate::init(QQuickWindow *c, QQuickRenderControl *control)
{
    q_ptr = c;
 
 
    Q_Q(QQuickWindow);
 
    contentItem = new QQuickRootItem;
    contentItem->setObjectName(q->objectName());
    QQml_setParent_noEvent(contentItem, c);
    QQmlEngine::setObjectOwnership(contentItem, QQmlEngine::CppOwnership);
    QQuickItemPrivate *contentItemPrivate = QQuickItemPrivate::get(contentItem);
    contentItemPrivate->window = q;
    contentItemPrivate->windowRefCount = 1;
    contentItemPrivate->flags |= QQuickItem::ItemIsFocusScope;
    contentItem->setSize(q->size());
    deliveryAgent = new QQuickDeliveryAgent(contentItem);
 
    visualizationMode = qgetenv("QSG_VISUALIZE");
    renderControl = control;
    if (renderControl)
        QQuickRenderControlPrivate::get(renderControl)->window = q;
 
    if (!renderControl)
        windowManager = QSGRenderLoop::instance();
 
    Q_ASSERT(windowManager || renderControl);
 
    QObject::connect(static_cast<QGuiApplication *>(QGuiApplication::instance()),
                     &QGuiApplication::fontDatabaseChanged,
                     q,
                     &QQuickWindow::handleFontDatabaseChanged);
 
    if (q->screen()) {
        lastReportedItemDevicePixelRatio = q->effectiveDevicePixelRatio();
    }
 
    QSGContext *sg;
    if (renderControl) {
        QQuickRenderControlPrivate *renderControlPriv = QQuickRenderControlPrivate::get(renderControl);
        sg = renderControlPriv->sg;
        context = renderControlPriv->rc;
    } else {
        windowManager->addWindow(q);
        sg = windowManager->sceneGraphContext();
        context = windowManager->createRenderContext(sg);
    }
 
    q->setSurfaceType(windowManager ? windowManager->windowSurfaceType() : QSurface::OpenGLSurface);
    q->setFormat(sg->defaultSurfaceFormat());
    // When using Vulkan, associating a scenegraph-managed QVulkanInstance with
    // the window (but only when not using renderControl) is deferred to
    // QSGRhiSupport::createRhi(). This allows applications to set up their own
    // QVulkanInstance and set that on the window, if they wish to.
 
    animationController.reset(new QQuickAnimatorController(q));
 
    QObject::connect(context, &QSGRenderContext::initialized, q, &QQuickWindow::sceneGraphInitialized, Qt::DirectConnection);
    QObject::connect(context, &QSGRenderContext::invalidated, q, &QQuickWindow::sceneGraphInvalidated, Qt::DirectConnection);
    QObject::connect(context, &QSGRenderContext::invalidated, q, &QQuickWindow::cleanupSceneGraph, Qt::DirectConnection);
 
    QObject::connect(q, &QQuickWindow::focusObjectChanged, q, &QQuickWindow::activeFocusItemChanged);
    QObject::connect(q, &QQuickWindow::screenChanged, q, &QQuickWindow::handleScreenChanged);
    QObject::connect(qApp, &QGuiApplication::applicationStateChanged, q, &QQuickWindow::handleApplicationStateChanged);
    QObject::connect(q, &QQuickWindow::frameSwapped, q, &QQuickWindow::runJobsAfterSwap, Qt::DirectConnection);
 
    if (QQmlInspectorService *service = QQmlDebugConnector::service<QQmlInspectorService>())
        service->addWindow(q);
}
 
void QQuickWindow::handleApplicationStateChanged(Qt::ApplicationState state)
{
    Q_D(QQuickWindow);
    if (state != Qt::ApplicationActive && d->contentItem) {
        auto da = d->deliveryAgentPrivate();
        Q_ASSERT(da);
        da->handleWindowDeactivate(this);
    }
}
 
QQmlListProperty<QObject> QQuickWindowPrivate::data()
{
    return QQmlListProperty<QObject>(q_func(), nullptr,
                                     QQuickWindowPrivate::data_append,
                                     QQuickWindowPrivate::data_count,
                                     QQuickWindowPrivate::data_at,
                                     QQuickWindowPrivate::data_clear,
                                     QQuickWindowPrivate::data_replace,
                                     QQuickWindowPrivate::data_removeLast);
}
 
void QQuickWindowPrivate::dirtyItem(QQuickItem *)
{
    Q_Q(QQuickWindow);
    q->maybeUpdate();
}
 
QQuickItem *QQuickWindow::mouseGrabberItem() const
{
    Q_D(const QQuickWindow);
    auto da = const_cast<QQuickWindowPrivate *>(d)->deliveryAgentPrivate();
    Q_ASSERT(da);
    // The normal use case is to call this function while an event is being delivered;
    // but if the caller knows about the event, it should call QPointerEvent::exclusiveGrabber() instead.
    if (auto epd = da->mousePointData())
        return qmlobject_cast<QQuickItem *>(epd->exclusiveGrabber);
 
    if (Q_LIKELY(d->deliveryAgentPrivate()->eventsInDelivery.isEmpty()))
        // mousePointData() checked that already: it's one reason epd can be null
        qCDebug(lcMouse, "mouse grabber ambiguous: no event is currently being delivered");
    // If no event is being delivered, we can return "the mouse" grabber,
    // but in general there could be more than one mouse, could be only a touchscreen etc.
    // That's why this function is obsolete.
    return qmlobject_cast<QQuickItem *>(QPointingDevicePrivate::get(QPointingDevice::primaryPointingDevice())->
                                        firstPointExclusiveGrabber());
}
 
void QQuickWindowPrivate::cleanup(QSGNode *n)
{
    Q_Q(QQuickWindow);
 
    Q_ASSERT(!cleanupNodeList.contains(n));
    cleanupNodeList.append(n);
    q->maybeUpdate();
}
 
QQuickWindow::QQuickWindow(QWindow *parent)
    : QQuickWindow(*new QQuickWindowPrivate, parent)
{
}
 
 
 
QQuickWindow::QQuickWindow(QQuickWindowPrivate &dd, QWindow *parent)
    : QWindow(dd, parent)
{
    Q_D(QQuickWindow);
    d->init(this);
}
 
QQuickWindow::QQuickWindow(QQuickRenderControl *control)
    : QWindow(*(new QQuickWindowPrivate), nullptr)
{
    Q_D(QQuickWindow);
    d->init(this, control);
}
 
QQuickWindow::QQuickWindow(QQuickWindowPrivate &dd, QQuickRenderControl *control)
    : QWindow(dd, nullptr)
{
    Q_D(QQuickWindow);
    d->init(this, control);
}
 
QQuickWindow::~QQuickWindow()
{
    Q_D(QQuickWindow);
    d->inDestructor = true;
    if (d->renderControl) {
        QQuickRenderControlPrivate::get(d->renderControl)->windowDestroyed();
    } else if (d->windowManager) {
        d->windowManager->removeWindow(this);
        d->windowManager->windowDestroyed(this);
    }
 
    delete d->incubationController; d->incubationController = nullptr;
    QQuickRootItem *root = d->contentItem;
    d->contentItem = nullptr;
    root->setParent(nullptr); // avoid QChildEvent delivery during deletion
    delete root;
    d->deliveryAgent = nullptr; // avoid forwarding events there during destruction
 
    d->renderJobMutex.lock();
    qDeleteAll(d->beforeSynchronizingJobs);
    d->beforeSynchronizingJobs.clear();
    qDeleteAll(d->afterSynchronizingJobs);
    d->afterSynchronizingJobs.clear();
    qDeleteAll(d->beforeRenderingJobs);
    d->beforeRenderingJobs.clear();
    qDeleteAll(d->afterRenderingJobs);
    d->afterRenderingJobs.clear();
    qDeleteAll(d->afterSwapJobs);
    d->afterSwapJobs.clear();
    d->renderJobMutex.unlock();
 
    // It is important that the pixmap cache is cleaned up during shutdown.
    // Besides playing nice, this also solves a practical problem that
    // QQuickTextureFactory implementations in other libraries need
    // have their destructors loaded while they the library is still
    // loaded into memory.
    QQuickPixmap::purgeCache();
}
 
#if QT_CONFIG(quick_shadereffect)
void qtquick_shadereffect_purge_gui_thread_shader_cache();
#endif
 
void QQuickWindow::releaseResources()
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->releaseResources(this);
    QQuickPixmap::purgeCache();
#if QT_CONFIG(quick_shadereffect)
    qtquick_shadereffect_purge_gui_thread_shader_cache();
#endif
}
 
 
 
void QQuickWindow::setPersistentGraphics(bool persistent)
{
    Q_D(QQuickWindow);
    d->persistentGraphics = persistent;
}
 
 
 
bool QQuickWindow::isPersistentGraphics() const
{
    Q_D(const QQuickWindow);
    return d->persistentGraphics;
}
 
 
 
void QQuickWindow::setPersistentSceneGraph(bool persistent)
{
    Q_D(QQuickWindow);
    d->persistentSceneGraph = persistent;
}
 
 
 
bool QQuickWindow::isPersistentSceneGraph() const
{
    Q_D(const QQuickWindow);
    return d->persistentSceneGraph;
}
 
QQuickItem *QQuickWindow::contentItem() const
{
    Q_D(const QQuickWindow);
 
    return d->contentItem;
}
 
QQuickItem *QQuickWindow::activeFocusItem() const
{
    Q_D(const QQuickWindow);
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    return da->activeFocusItem;
}
 
QObject *QQuickWindow::focusObject() const
{
    Q_D(const QQuickWindow);
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    if (!d->inDestructor && da->activeFocusItem)
        return da->activeFocusItem;
    return const_cast<QQuickWindow*>(this);
}
 
void QQuickWindowPrivate::clearGrabbers(QPointerEvent *pointerEvent)
{
    if (pointerEvent->isEndEvent()
        && !(QQuickDeliveryAgentPrivate::isTabletEvent(pointerEvent)
             && (qApp->testAttribute(Qt::AA_SynthesizeMouseForUnhandledTabletEvents)
                 || QWindowSystemInterfacePrivate::TabletEvent::platformSynthesizesMouse))) {
        if (pointerEvent->isSinglePointEvent()) {
            if (static_cast<QSinglePointEvent *>(pointerEvent)->buttons() == Qt::NoButton) {
                auto &firstPt = pointerEvent->point(0);
                pointerEvent->setExclusiveGrabber(firstPt, nullptr);
                pointerEvent->clearPassiveGrabbers(firstPt);
            }
        } else {
            for (auto &point : pointerEvent->points()) {
                if (point.state() == QEventPoint::State::Released) {
                    pointerEvent->setExclusiveGrabber(point, nullptr);
                    pointerEvent->clearPassiveGrabbers(point);
                }
            }
        }
    }
}
 
bool QQuickWindow::event(QEvent *event)
{
    Q_D(QQuickWindow);
 
    // bypass QWindow::event dispatching of input events: deliveryAgent takes care of it
    QQuickDeliveryAgent *da = d->deliveryAgent;
    if (event->isPointerEvent()) {
        /*
            We can't bypass the virtual functions like mousePressEvent() tabletEvent() etc.,
            for the sake of code that subclasses QQuickWindow and overrides them, even though
            we no longer need them as entry points for Qt Quick event delivery.
            So dispatch to them now, ahead of normal delivery, and stop them from calling
            back into this function if they were called from here (avoid recursion).
            It could also be that user code expects them to work as entry points, too;
            in that case, windowEventDispatch _won't_ be set, so the event comes here and
            we'll dispatch it further below.
        */
        if (d->windowEventDispatch)
            return false;
        {
            const bool wasAccepted = event->isAccepted();
            QBoolBlocker windowEventDispatchGuard(d->windowEventDispatch, true);
            qCDebug(lcPtr) << "dispatching to window functions in case of override" << event;
            QWindow::event(event);
            if (event->isAccepted() && !wasAccepted)
                return true;
        }
        /*
            QQuickWindow does not override touchEvent(). If the application has a subclass
            of QQuickWindow which allows the event to remain accepted, it means they want
            to stop propagation here, so return early (below). But otherwise we will call
            QWindow::touchEvent(), which will ignore(); in that case, we need to continue
            with the usual delivery below, so we need to undo the ignore().
        */
        auto pe = static_cast<QPointerEvent *>(event);
        if (QQuickDeliveryAgentPrivate::isTouchEvent(pe))
            event->accept();
        // end of dispatch to user-overridden virtual window functions
 
        /*
            When delivering update and release events to existing grabbers,
            use the subscene delivery agent, if any.  A possible scenario:
            1) Two touchpoints pressed on the main window: QQuickWindowPrivate::deliveryAgent delivers to QQuick3DViewport,
            which does picking and finds two subscenes ("root" Items mapped onto two different 3D objects) to deliver it to.
            2) The QTouchEvent is split up so that each subscene sees points relevant to it.
            3) During delivery to either subscene, an item in the subscene grabs.
            4) The user moves finger(s) generating a move event: the correct grabber item needs to get the update
            via the same subscene delivery agent from which it got the press, so that the coord transform will be done properly.
            5) Likewise with the touchpoint releases.
            With single-point events (mouse, or only one finger) it's simplified: there can only be one subscene of interest;
            for (pt : pe->points()) would only iterate once, so we might as well skip that logic.
        */
        if (pe->pointCount()) {
            const bool synthMouse = QQuickDeliveryAgentPrivate::isSynthMouse(pe);
            if (QQuickDeliveryAgentPrivate::subsceneAgentsExist) {
                bool ret = false;
                // Split up the multi-point event according to the relevant QQuickDeliveryAgent that should deliver to each existing grabber
                // but send ungrabbed points to d->deliveryAgent()
                QFlatMap<QQuickDeliveryAgent*, QList<QEventPoint>> deliveryAgentsNeedingPoints;
                QEventPoint::States eventStates;
 
                auto insert = [&](QQuickDeliveryAgent *ptda, const QEventPoint &pt) {
                    if (pt.state() == QEventPoint::Pressed && !synthMouse)
                        pe->clearPassiveGrabbers(pt);
                    auto &ptList = deliveryAgentsNeedingPoints[ptda];
                    auto idEquals = [](auto id) { return [id] (const auto &e) { return e.id() == id; }; };
                    if (std::none_of(ptList.cbegin(), ptList.cend(), idEquals(pt.id())))
                        ptList.append(pt);
                };
 
                for (const auto &pt : pe->points()) {
                    eventStates |= pt.state();
                    auto epd = QPointingDevicePrivate::get(const_cast<QPointingDevice*>(pe->pointingDevice()))->queryPointById(pt.id());
                    Q_ASSERT(epd);
                    bool foundAgent = false;
                    if (!epd->exclusiveGrabber.isNull() && !epd->exclusiveGrabberContext.isNull()) {
                        if (auto ptda = qobject_cast<QQuickDeliveryAgent *>(epd->exclusiveGrabberContext.data())) {
                            insert(ptda, pt);
                            qCDebug(lcPtr) << pe->type() << "point" << pt.id() << pt.state()
                                           << "@" << pt.scenePosition() << "will be re-delivered via known grabbing agent" << ptda << "to" << epd->exclusiveGrabber.data();
                            foundAgent = true;
                        }
                    }
                    for (auto pgda : epd->passiveGrabbersContext) {
                        if (auto ptda = qobject_cast<QQuickDeliveryAgent *>(pgda.data())) {
                            insert(ptda, pt);
                            qCDebug(lcPtr) << pe->type() << "point" << pt.id() << pt.state()
                                           << "@" << pt.scenePosition() << "will be re-delivered via known passive-grabbing agent" << ptda;
                            foundAgent = true;
                        }
                    }
                    // fallback: if we didn't find remembered/known grabber agent(s), expect the root DA to handle it
                    if (!foundAgent)
                        insert(da, pt);
                }
                for (auto daAndPoints : deliveryAgentsNeedingPoints) {
                    if (pe->pointCount() > 1) {
                        Q_ASSERT(QQuickDeliveryAgentPrivate::isTouchEvent(pe));
                        // if all points have the same state, set the event type accordingly
                        QEvent::Type eventType = pe->type();
                        switch (eventStates) {
                        case QEventPoint::State::Pressed:
                            eventType = QEvent::TouchBegin;
                            break;
                        case QEventPoint::State::Released:
                            eventType = QEvent::TouchEnd;
                            break;
                        default:
                            eventType = QEvent::TouchUpdate;
                            break;
                        }
                        // Make a new touch event for the subscene, the same way QQuickItemPrivate::localizedTouchEvent() does it
                        QMutableTouchEvent te(eventType, pe->pointingDevice(), pe->modifiers(), daAndPoints.second);
                        te.setTimestamp(pe->timestamp());
                        te.accept();
                        qCDebug(lcTouch) << daAndPoints.first << "shall now receive" << &te;
                        ret = daAndPoints.first->event(&te) || ret;
                    } else {
                        qCDebug(lcPtr) << daAndPoints.first << "shall now receive" << pe;
                        ret = daAndPoints.first->event(pe) || ret;
                    }
                }
 
                if (ret)
                    return true;
            } else if (!synthMouse) {
                // clear passive grabbers unless it's a system synth-mouse event
                // QTBUG-104890: Windows sends synth mouse events (which should be ignored) after touch events
                for (const auto &pt : pe->points()) {
                    if (pt.state() == QEventPoint::Pressed)
                        pe->clearPassiveGrabbers(pt);
                }
            }
        }
 
        // If it has no points, it's probably a TouchCancel, and DeliveryAgent needs to handle it.
        // If we didn't handle it in the block above, handle it now.
        // TODO should we deliver to all DAs at once then, since we don't know which one should get it?
        // or fix QTBUG-90851 so that the event always has points?
        bool ret = (da && da->event(event));
 
        d->clearGrabbers(pe);
 
        if (ret)
            return true;
    } else if (event->isInputEvent()) {
        if (da && da->event(event))
            return true;
    }
 
    switch (event->type()) {
    // a few more types that are not QInputEvents, but QQuickDeliveryAgent needs to handle them anyway
    case QEvent::FocusAboutToChange:
    case QEvent::Enter:
    case QEvent::Leave:
    case QEvent::InputMethod:
    case QEvent::InputMethodQuery:
#if QT_CONFIG(quick_draganddrop)
    case QEvent::DragEnter:
    case QEvent::DragLeave:
    case QEvent::DragMove:
    case QEvent::Drop:
#endif
        if (d->inDestructor)
            return false;
        if (da && da->event(event))
            return true;
        break;
    case QEvent::LanguageChange:
    case QEvent::LocaleChange:
        if (d->contentItem)
            QCoreApplication::sendEvent(d->contentItem, event);
        break;
    case QEvent::UpdateRequest:
        if (d->windowManager)
            d->windowManager->handleUpdateRequest(this);
        break;
    case QEvent::PlatformSurface:
        if ((static_cast<QPlatformSurfaceEvent *>(event))->surfaceEventType() == QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed) {
            // Ensure that the rendering thread is notified before
            // the QPlatformWindow is destroyed.
            if (d->windowManager)
                d->windowManager->hide(this);
        }
        break;
    case QEvent::WindowDeactivate:
        if (auto da = d->deliveryAgentPrivate())
            da->handleWindowDeactivate(this);
        Q_FALLTHROUGH();
    case QEvent::WindowActivate:
        if (d->contentItem)
            QCoreApplication::sendEvent(d->contentItem, event);
        break;
    case QEvent::ApplicationPaletteChange:
        d->inheritPalette(QGuiApplication::palette());
        if (d->contentItem)
            QCoreApplication::sendEvent(d->contentItem, event);
        break;
    case QEvent::DevicePixelRatioChange:
        physicalDpiChanged();
        break;
    default:
        break;
    }
 
    if (event->type() == QEvent::Type(QQuickWindowPrivate::FullUpdateRequest))
        update();
    else if (event->type() == QEvent::Type(QQuickWindowPrivate::TriggerContextCreationFailure))
        d->windowManager->handleContextCreationFailure(this);
 
    if (event->isPointerEvent())
        return true;
    else
        return QWindow::event(event);
}
 
void QQuickWindow::keyPressEvent(QKeyEvent *e)
{
    Q_D(QQuickWindow);
    if (d->windowEventDispatch)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    da->deliverKeyEvent(e);
}
 
void QQuickWindow::keyReleaseEvent(QKeyEvent *e)
{
    Q_D(QQuickWindow);
    if (d->windowEventDispatch)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    da->deliverKeyEvent(e);
}
 
#if QT_CONFIG(wheelevent)
void QQuickWindow::wheelEvent(QWheelEvent *event)
{
    Q_D(QQuickWindow);
    if (d->windowEventDispatch)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    da->deliverSinglePointEventUntilAccepted(event);
}
#endif // wheelevent
 
#if QT_CONFIG(tabletevent)
void QQuickWindow::tabletEvent(QTabletEvent *event)
{
    Q_D(QQuickWindow);
    if (d->windowEventDispatch)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    da->deliverPointerEvent(event);
}
#endif // tabletevent
 
void QQuickWindow::mousePressEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    if (d->windowEventDispatch)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    da->handleMouseEvent(event);
}
void QQuickWindow::mouseMoveEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    if (d->windowEventDispatch)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    da->handleMouseEvent(event);
}
void QQuickWindow::mouseDoubleClickEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    if (d->windowEventDispatch)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    da->handleMouseEvent(event);
}
void QQuickWindow::mouseReleaseEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    if (d->windowEventDispatch)
        return;
    auto da = d->deliveryAgentPrivate();
    Q_ASSERT(da);
    da->handleMouseEvent(event);
}
 
#if QT_CONFIG(cursor)
void QQuickWindowPrivate::updateCursor(const QPointF &scenePos, QQuickItem *rootItem)
{
    Q_Q(QQuickWindow);
    if (!rootItem)
        rootItem = contentItem;
    auto cursorItemAndHandler = findCursorItemAndHandler(rootItem, scenePos);
    if (cursorItem != cursorItemAndHandler.first || cursorHandler != cursorItemAndHandler.second) {
        QWindow *renderWindow = QQuickRenderControl::renderWindowFor(q);
        QWindow *window = renderWindow ? renderWindow : q;
        cursorItem = cursorItemAndHandler.first;
        cursorHandler = cursorItemAndHandler.second;
        if (cursorItem) {
            const auto cursor = QQuickItemPrivate::get(cursorItem)->effectiveCursor(cursorHandler);
            qCDebug(lcHoverTrace) << "setting cursor" << cursor << "from" << cursorHandler << "or" << cursorItem;
            window->setCursor(cursor);
        } else {
            qCDebug(lcHoverTrace) << "unsetting cursor";
            window->unsetCursor();
        }
    }
}
 
QPair<QQuickItem*, QQuickPointerHandler*> QQuickWindowPrivate::findCursorItemAndHandler(QQuickItem *item, const QPointF &scenePos) const
{
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
    if (itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        QPointF p = item->mapFromScene(scenePos);
        if (!item->contains(p))
            return {nullptr, nullptr};
    }
 
    if (itemPrivate->subtreeCursorEnabled) {
        QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
        for (int ii = children.size() - 1; ii >= 0; --ii) {
            QQuickItem *child = children.at(ii);
            if (!child->isVisible() || !child->isEnabled() || QQuickItemPrivate::get(child)->culled)
                continue;
            auto ret = findCursorItemAndHandler(child, scenePos);
            if (ret.first)
                return ret;
        }
        if (itemPrivate->hasCursorHandler) {
            if (auto handler = itemPrivate->effectiveCursorHandler()) {
                if (handler->parentContains(scenePos))
                    return {item, handler};
            }
        }
        if (itemPrivate->hasCursor) {
            QPointF p = item->mapFromScene(scenePos);
            if (item->contains(p))
                return {item, nullptr};
        }
    }
 
    return {nullptr, nullptr};
}
#endif
 
void QQuickWindowPrivate::clearFocusObject()
{
    if (auto da = deliveryAgentPrivate())
        da->clearFocusObject();
}
 
void QQuickWindowPrivate::data_append(QQmlListProperty<QObject> *property, QObject *o)
{
    if (!o)
        return;
    QQuickWindow *that = static_cast<QQuickWindow *>(property->object);
    if (QQuickWindow *window = qmlobject_cast<QQuickWindow *>(o)) {
        qCDebug(lcTransient) << window << "is transient for" << that;
        window->setTransientParent(that);
    }
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(that->contentItem())->data();
    itemProperty.append(&itemProperty, o);
}
 
qsizetype QQuickWindowPrivate::data_count(QQmlListProperty<QObject> *property)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    if (!win || !win->contentItem() || !QQuickItemPrivate::get(win->contentItem())->data().count)
        return 0;
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    return itemProperty.count(&itemProperty);
}
 
QObject *QQuickWindowPrivate::data_at(QQmlListProperty<QObject> *property, qsizetype i)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    return itemProperty.at(&itemProperty, i);
}
 
void QQuickWindowPrivate::data_clear(QQmlListProperty<QObject> *property)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    itemProperty.clear(&itemProperty);
}
 
void QQuickWindowPrivate::data_replace(QQmlListProperty<QObject> *property, qsizetype i, QObject *o)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    itemProperty.replace(&itemProperty, i, o);
}
 
void QQuickWindowPrivate::data_removeLast(QQmlListProperty<QObject> *property)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    itemProperty.removeLast(&itemProperty);
}
 
bool QQuickWindowPrivate::isRenderable() const
{
    Q_Q(const QQuickWindow);
    return ((q->isExposed() && q->isVisible())) && q->geometry().isValid();
}
 
void QQuickWindowPrivate::rhiCreationFailureMessage(const QString &backendName,
                                                    QString *translatedMessage,
                                                    QString *untranslatedMessage)
{
    const char msg[] = QT_TRANSLATE_NOOP("QQuickWindow",
        "Failed to initialize graphics backend for %1.");
    *translatedMessage = QQuickWindow::tr(msg).arg(backendName);
    *untranslatedMessage = QString::fromLatin1(msg).arg(backendName);
}
 
void QQuickWindowPrivate::cleanupNodes()
{
    for (int ii = 0; ii < cleanupNodeList.size(); ++ii)
        delete cleanupNodeList.at(ii);
    cleanupNodeList.clear();
}
 
void QQuickWindowPrivate::cleanupNodesOnShutdown(QQuickItem *item)
{
    QQuickItemPrivate *p = QQuickItemPrivate::get(item);
    if (p->itemNodeInstance) {
        delete p->itemNodeInstance;
        p->itemNodeInstance = nullptr;
 
        if (p->extra.isAllocated()) {
            p->extra->opacityNode = nullptr;
            p->extra->clipNode = nullptr;
            p->extra->rootNode = nullptr;
        }
 
        p->paintNode = nullptr;
 
        p->dirty(QQuickItemPrivate::Window);
    }
 
    // Qt 7: Make invalidateSceneGraph a virtual member of QQuickItem
    if (p->flags & QQuickItem::ItemHasContents) {
        const QMetaObject *mo = item->metaObject();
        int index = mo->indexOfSlot("invalidateSceneGraph()");
        if (index >= 0) {
            const QMetaMethod &method = mo->method(index);
            // Skip functions named invalidateSceneGraph() in QML items.
            if (strstr(method.enclosingMetaObject()->className(), "_QML_") == nullptr)
                method.invoke(item, Qt::DirectConnection);
        }
    }
 
    for (int ii = 0; ii < p->childItems.size(); ++ii)
        cleanupNodesOnShutdown(p->childItems.at(ii));
}
 
// This must be called from the render thread, with the main thread frozen
void QQuickWindowPrivate::cleanupNodesOnShutdown()
{
    Q_Q(QQuickWindow);
    cleanupNodes();
    cleanupNodesOnShutdown(contentItem);
    for (QSet<QQuickItem *>::const_iterator it = parentlessItems.begin(), cend = parentlessItems.end(); it != cend; ++it)
        cleanupNodesOnShutdown(*it);
    animationController->windowNodesDestroyed();
    q->cleanupSceneGraph();
}
 
void QQuickWindowPrivate::updateDirtyNodes()
{
    qCDebug(lcDirty) << "QQuickWindowPrivate::updateDirtyNodes():";
 
    cleanupNodes();
 
    QQuickItem *updateList = dirtyItemList;
    dirtyItemList = nullptr;
    if (updateList) QQuickItemPrivate::get(updateList)->prevDirtyItem = &updateList;
 
    while (updateList) {
        QQuickItem *item = updateList;
        QQuickItemPrivate *itemPriv = QQuickItemPrivate::get(item);
        itemPriv->removeFromDirtyList();
 
        qCDebug(lcDirty) << "   QSGNode:" << item << qPrintable(itemPriv->dirtyToString());
        updateDirtyNode(item);
    }
}
 
static inline QSGNode *qquickitem_before_paintNode(QQuickItemPrivate *d)
{
    const QList<QQuickItem *> childItems = d->paintOrderChildItems();
    QQuickItem *before = nullptr;
    for (int i=0; i<childItems.size(); ++i) {
        QQuickItemPrivate *dd = QQuickItemPrivate::get(childItems.at(i));
        // Perform the same check as the in fetchNextNode below.
        if (dd->z() < 0 && (dd->explicitVisible || (dd->extra.isAllocated() && dd->extra->effectRefCount)))
            before = childItems.at(i);
        else
            break;
    }
    return Q_UNLIKELY(before) ? QQuickItemPrivate::get(before)->itemNode() : nullptr;
}
 
static QSGNode *fetchNextNode(QQuickItemPrivate *itemPriv, int &ii, bool &returnedPaintNode)
{
    QList<QQuickItem *> orderedChildren = itemPriv->paintOrderChildItems();
 
    for (; ii < orderedChildren.size() && orderedChildren.at(ii)->z() < 0; ++ii) {
        QQuickItemPrivate *childPrivate = QQuickItemPrivate::get(orderedChildren.at(ii));
        if (!childPrivate->explicitVisible &&
            (!childPrivate->extra.isAllocated() || !childPrivate->extra->effectRefCount))
            continue;
 
        ii++;
        return childPrivate->itemNode();
    }
 
    if (itemPriv->paintNode && !returnedPaintNode) {
        returnedPaintNode = true;
        return itemPriv->paintNode;
    }
 
    for (; ii < orderedChildren.size(); ++ii) {
        QQuickItemPrivate *childPrivate = QQuickItemPrivate::get(orderedChildren.at(ii));
        if (!childPrivate->explicitVisible &&
            (!childPrivate->extra.isAllocated() || !childPrivate->extra->effectRefCount))
            continue;
 
        ii++;
        return childPrivate->itemNode();
    }
 
    return nullptr;
}
 
void QQuickWindowPrivate::updateDirtyNode(QQuickItem *item)
{
    QQuickItemPrivate *itemPriv = QQuickItemPrivate::get(item);
    quint32 dirty = itemPriv->dirtyAttributes;
    itemPriv->dirtyAttributes = 0;
 
    if ((dirty & QQuickItemPrivate::TransformUpdateMask) ||
        (dirty & QQuickItemPrivate::Size && itemPriv->origin() != QQuickItem::TopLeft &&
         (itemPriv->scale() != 1. || itemPriv->rotation() != 0.))) {
 
        QMatrix4x4 matrix;
 
        if (itemPriv->x != 0. || itemPriv->y != 0.)
            matrix.translate(itemPriv->x, itemPriv->y);
 
        for (int ii = itemPriv->transforms.size() - 1; ii >= 0; --ii)
            itemPriv->transforms.at(ii)->applyTo(&matrix);
 
        if (itemPriv->scale() != 1. || itemPriv->rotation() != 0.) {
            QPointF origin = item->transformOriginPoint();
            matrix.translate(origin.x(), origin.y());
            if (itemPriv->scale() != 1.)
                matrix.scale(itemPriv->scale(), itemPriv->scale());
            if (itemPriv->rotation() != 0.)
                matrix.rotate(itemPriv->rotation(), 0, 0, 1);
            matrix.translate(-origin.x(), -origin.y());
        }
 
        itemPriv->itemNode()->setMatrix(matrix);
    }
 
    const bool clipEffectivelyChanged = dirty & (QQuickItemPrivate::Clip | QQuickItemPrivate::Window);
    if (clipEffectivelyChanged) {
        QSGNode *parent = itemPriv->opacityNode() ? (QSGNode *)itemPriv->opacityNode()
                                                  : (QSGNode *)itemPriv->itemNode();
        QSGNode *child = itemPriv->rootNode();
 
        if (bool initializeClipNode = item->clip() && itemPriv->clipNode() == nullptr;
            initializeClipNode) {
            QQuickDefaultClipNode *clip = new QQuickDefaultClipNode(item->clipRect());
            itemPriv->extra.value().clipNode = clip;
            clip->update();
 
            if (!child) {
                parent->reparentChildNodesTo(clip);
                parent->appendChildNode(clip);
            } else {
                parent->removeChildNode(child);
                clip->appendChildNode(child);
                parent->appendChildNode(clip);
            }
 
        } else if (bool updateClipNode = item->clip() && itemPriv->clipNode() != nullptr;
                   updateClipNode) {
            QQuickDefaultClipNode *clip = itemPriv->clipNode();
            clip->setClipRect(item->clipRect());
            clip->update();
        } else if (bool removeClipNode = !item->clip() && itemPriv->clipNode() != nullptr;
                   removeClipNode) {
            QQuickDefaultClipNode *clip = itemPriv->clipNode();
            parent->removeChildNode(clip);
            if (child) {
                clip->removeChildNode(child);
                parent->appendChildNode(child);
            } else {
                clip->reparentChildNodesTo(parent);
            }
 
            delete itemPriv->clipNode();
            itemPriv->extra->clipNode = nullptr;
        }
    }
 
    const int effectRefCount = itemPriv->extra.isAllocated() ? itemPriv->extra->effectRefCount : 0;
    const bool effectRefEffectivelyChanged =
            (dirty & (QQuickItemPrivate::EffectReference | QQuickItemPrivate::Window))
            && ((effectRefCount == 0) != (itemPriv->rootNode() == nullptr));
    if (effectRefEffectivelyChanged) {
        if (dirty & QQuickItemPrivate::ChildrenUpdateMask)
            itemPriv->childContainerNode()->removeAllChildNodes();
 
        QSGNode *parent = itemPriv->clipNode();
        if (!parent)
            parent = itemPriv->opacityNode();
        if (!parent)
            parent = itemPriv->itemNode();
 
        if (itemPriv->extra.isAllocated() && itemPriv->extra->effectRefCount) {
            Q_ASSERT(itemPriv->rootNode() == nullptr);
            QSGRootNode *root = new QSGRootNode();
            itemPriv->extra->rootNode = root;
            parent->reparentChildNodesTo(root);
            parent->appendChildNode(root);
        } else {
            Q_ASSERT(itemPriv->rootNode() != nullptr);
            QSGRootNode *root = itemPriv->rootNode();
            parent->removeChildNode(root);
            root->reparentChildNodesTo(parent);
            delete itemPriv->rootNode();
            itemPriv->extra->rootNode = nullptr;
        }
    }
 
    if (dirty & QQuickItemPrivate::ChildrenUpdateMask) {
        int ii = 0;
        bool fetchedPaintNode = false;
        QList<QQuickItem *> orderedChildren = itemPriv->paintOrderChildItems();
        int desiredNodesSize = orderedChildren.size() + (itemPriv->paintNode ? 1 : 0);
 
        // now start making current state match the promised land of
        // desiredNodes. in the case of our current state matching desiredNodes
        // (though why would we get ChildrenUpdateMask with no changes?) then we
        // should make no changes at all.
 
        // how many nodes did we process, when examining changes
        int desiredNodesProcessed = 0;
 
        // currentNode is how far, in our present tree, we have processed. we
        // make use of this later on to trim the current child list if the
        // desired list is shorter.
        QSGNode *groupNode = itemPriv->childContainerNode();
        QSGNode *currentNode = groupNode->firstChild();
        QSGNode *desiredNode = nullptr;
 
        while (currentNode && (desiredNode = fetchNextNode(itemPriv, ii, fetchedPaintNode))) {
            if (currentNode != desiredNode) {
                // uh oh... reality and our utopic paradise are diverging!
                // we need to reconcile this...
                if (currentNode->nextSibling() == desiredNode) {
                    // nice and simple: a node was removed, and the next in line is correct.
                    groupNode->removeChildNode(currentNode);
                } else {
                    // a node needs to be added..
                    // remove it from any pre-existing parent, and push it before currentNode,
                    // so it's in the correct place...
                    if (desiredNode->parent()) {
                        desiredNode->parent()->removeChildNode(desiredNode);
                    }
                    groupNode->insertChildNodeBefore(desiredNode, currentNode);
                }
 
                // continue iteration at the correct point, now desiredNode is in place...
                currentNode = desiredNode;
            }
 
            currentNode = currentNode->nextSibling();
            desiredNodesProcessed++;
        }
 
        // if we didn't process as many nodes as in the new list, then we have
        // more nodes at the end of desiredNodes to append to our list.
        // this will be the case when adding new nodes, for instance.
        if (desiredNodesProcessed < desiredNodesSize) {
            while ((desiredNode = fetchNextNode(itemPriv, ii, fetchedPaintNode))) {
                if (desiredNode->parent())
                    desiredNode->parent()->removeChildNode(desiredNode);
                groupNode->appendChildNode(desiredNode);
            }
        } else if (currentNode) {
            // on the other hand, if we processed less than our current node
            // tree, then nodes have been _removed_ from the scene, and we need
            // to take care of that here.
            while (currentNode) {
                QSGNode *node = currentNode->nextSibling();
                groupNode->removeChildNode(currentNode);
                currentNode = node;
            }
        }
    }
 
    if ((dirty & QQuickItemPrivate::Size) && itemPriv->clipNode()) {
        itemPriv->clipNode()->setRect(item->clipRect());
        itemPriv->clipNode()->update();
    }
 
    if (dirty & (QQuickItemPrivate::OpacityValue | QQuickItemPrivate::Visible
                 | QQuickItemPrivate::HideReference | QQuickItemPrivate::Window))
    {
        qreal opacity = itemPriv->explicitVisible && (!itemPriv->extra.isAllocated() || itemPriv->extra->hideRefCount == 0)
                      ? itemPriv->opacity() : qreal(0);
 
        if (opacity != 1 && !itemPriv->opacityNode()) {
            QSGOpacityNode *node = new QSGOpacityNode;
            itemPriv->extra.value().opacityNode = node;
 
            QSGNode *parent = itemPriv->itemNode();
            QSGNode *child = itemPriv->clipNode();
            if (!child)
                child = itemPriv->rootNode();
 
            if (child) {
                parent->removeChildNode(child);
                node->appendChildNode(child);
                parent->appendChildNode(node);
            } else {
                parent->reparentChildNodesTo(node);
                parent->appendChildNode(node);
            }
        }
        if (itemPriv->opacityNode())
            itemPriv->opacityNode()->setOpacity(opacity);
    }
 
    if (dirty & QQuickItemPrivate::ContentUpdateMask) {
 
        if (itemPriv->flags & QQuickItem::ItemHasContents) {
            updatePaintNodeData.transformNode = itemPriv->itemNode();
            itemPriv->paintNode = item->updatePaintNode(itemPriv->paintNode, &updatePaintNodeData);
 
            Q_ASSERT(itemPriv->paintNode == nullptr ||
                     itemPriv->paintNode->parent() == nullptr ||
                     itemPriv->paintNode->parent() == itemPriv->childContainerNode());
 
            if (itemPriv->paintNode && itemPriv->paintNode->parent() == nullptr) {
                QSGNode *before = qquickitem_before_paintNode(itemPriv);
                if (before && before->parent()) {
                    Q_ASSERT(before->parent() == itemPriv->childContainerNode());
                    itemPriv->childContainerNode()->insertChildNodeAfter(itemPriv->paintNode, before);
                } else {
                    itemPriv->childContainerNode()->prependChildNode(itemPriv->paintNode);
                }
            }
        } else if (itemPriv->paintNode) {
            delete itemPriv->paintNode;
            itemPriv->paintNode = nullptr;
        }
    }
 
#ifndef QT_NO_DEBUG
    // Check consistency.
 
    QList<QSGNode *> nodes;
    nodes << itemPriv->itemNodeInstance
          << itemPriv->opacityNode()
          << itemPriv->clipNode()
          << itemPriv->rootNode()
          << itemPriv->paintNode;
    nodes.removeAll(nullptr);
 
    Q_ASSERT(nodes.constFirst() == itemPriv->itemNodeInstance);
    for (int i=1; i<nodes.size(); ++i) {
        QSGNode *n = nodes.at(i);
        // Failing this means we messed up reparenting
        Q_ASSERT(n->parent() == nodes.at(i-1));
        // Only the paintNode and the one who is childContainer may have more than one child.
        Q_ASSERT(n == itemPriv->paintNode || n == itemPriv->childContainerNode() || n->childCount() == 1);
    }
#endif
 
}
 
bool QQuickWindowPrivate::emitError(QQuickWindow::SceneGraphError error, const QString &msg)
{
    Q_Q(QQuickWindow);
    static const QMetaMethod errorSignal = QMetaMethod::fromSignal(&QQuickWindow::sceneGraphError);
    if (q->isSignalConnected(errorSignal)) {
        emit q->sceneGraphError(error, msg);
        return true;
    }
    return false;
}
 
void QQuickWindow::maybeUpdate()
{
    Q_D(QQuickWindow);
    if (d->renderControl)
        QQuickRenderControlPrivate::get(d->renderControl)->maybeUpdate();
    else if (d->windowManager)
        d->windowManager->maybeUpdate(this);
}
 
void QQuickWindow::cleanupSceneGraph()
{
    Q_D(QQuickWindow);
    if (!d->renderer)
        return;
 
    delete d->renderer->rootNode();
    delete d->renderer;
    d->renderer = nullptr;
 
    d->runAndClearJobs(&d->beforeSynchronizingJobs);
    d->runAndClearJobs(&d->afterSynchronizingJobs);
    d->runAndClearJobs(&d->beforeRenderingJobs);
    d->runAndClearJobs(&d->afterRenderingJobs);
    d->runAndClearJobs(&d->afterSwapJobs);
}
 
void QQuickWindow::setTransientParent_helper(QQuickWindow *window)
{
    qCDebug(lcTransient) << this << "is transient for" << window;
    setTransientParent(window);
    disconnect(sender(), SIGNAL(windowChanged(QQuickWindow*)),
               this, SLOT(setTransientParent_helper(QQuickWindow*)));
}
 
QOpenGLContext *QQuickWindowPrivate::openglContext()
{
#if QT_CONFIG(opengl)
    if (context && context->isValid()) {
        QSGRendererInterface *rif = context->sceneGraphContext()->rendererInterface(context);
        if (rif) {
            Q_Q(QQuickWindow);
            return reinterpret_cast<QOpenGLContext *>(rif->getResource(q, QSGRendererInterface::OpenGLContextResource));
        }
    }
#endif
    return nullptr;
}
 
bool QQuickWindow::isSceneGraphInitialized() const
{
    Q_D(const QQuickWindow);
    return d->context != nullptr && d->context->isValid();
}
 
void QQuickWindow::setRenderTarget(const QQuickRenderTarget &target)
{
    Q_D(QQuickWindow);
    if (target != d->customRenderTarget) {
        d->customRenderTarget = target;
        d->redirect.renderTargetDirty = true;
    }
}
 
QQuickRenderTarget QQuickWindow::renderTarget() const
{
    Q_D(const QQuickWindow);
    return d->customRenderTarget;
}
 
#ifdef Q_OS_WEBOS
class GrabWindowForProtectedContent : public QRunnable
{
public:
    GrabWindowForProtectedContent(QQuickWindow *window, QImage *image, QWaitCondition *condition)
        : m_window(window)
        , m_image(image)
        , m_condition(condition)
    {
    }
 
    bool checkGrabbable()
    {
        if (!m_window)
            return false;
        if (!m_image)
            return false;
        if (!QQuickWindowPrivate::get(m_window))
            return false;
 
        return true;
    }
 
    void run() override
    {
        if (!checkGrabbable())
            return;
 
        *m_image = QSGRhiSupport::instance()->grabOffscreenForProtectedContent(m_window);
        if (m_condition)
            m_condition->wakeOne();
        return;
    }
 
private:
    QQuickWindow *m_window;
    QImage *m_image;
    QWaitCondition *m_condition;
 
};
#endif
 
QImage QQuickWindow::grabWindow()
{
    Q_D(QQuickWindow);
 
    if (!d->isRenderable() && !d->renderControl) {
        // backends like software can grab regardless of the window state
        if (d->windowManager && (d->windowManager->flags() & QSGRenderLoop::SupportsGrabWithoutExpose))
            return d->windowManager->grab(this);
 
        if (!isSceneGraphInitialized()) {
            // We do not have rendering up and running. Forget the render loop,
            // do a frame completely offscreen and synchronously into a
            // texture. This can be *very* slow due to all the device/context
            // and resource initialization but the documentation warns for it,
            // and is still important for some use cases.
            Q_ASSERT(!d->rhi);
            return QSGRhiSupport::instance()->grabOffscreen(this);
        }
    }
 
#ifdef Q_OS_WEBOS
    if (requestedFormat().testOption(QSurfaceFormat::ProtectedContent)) {
        QImage image;
        QMutex mutex;
        QWaitCondition condition;
        mutex.lock();
        GrabWindowForProtectedContent *job = new GrabWindowForProtectedContent(this, &image, &condition);
        if (!job) {
            qWarning("QQuickWindow::grabWindow: Failed to create a job for capturing protected content");
            mutex.unlock();
            return QImage();
        }
        scheduleRenderJob(job, QQuickWindow::NoStage);
        condition.wait(&mutex);
        mutex.unlock();
        return image;
    }
#endif
    // The common case: we have an exposed window with an initialized
    // scenegraph, meaning we can request grabbing via the render loop, or we
    // are not targeting the window, in which case the request is to be
    // forwarded to the rendercontrol.
    if (d->renderControl)
        return QQuickRenderControlPrivate::get(d->renderControl)->grab();
    else if (d->windowManager)
        return d->windowManager->grab(this);
 
    return QImage();
}
 
QQmlIncubationController *QQuickWindow::incubationController() const
{
    Q_D(const QQuickWindow);
 
    if (!d->windowManager)
        return nullptr; // TODO: make sure that this is safe
 
    if (!d->incubationController)
        d->incubationController = new QQuickWindowIncubationController(d->windowManager);
    return d->incubationController;
}
 
 
 
QSGTexture *QQuickWindow::createTextureFromImage(const QImage &image) const
{
    return createTextureFromImage(image, {});
}
 
 
QSGTexture *QQuickWindow::createTextureFromImage(const QImage &image, CreateTextureOptions options) const
{
    Q_D(const QQuickWindow);
    if (!isSceneGraphInitialized()) // check both for d->context and d->context->isValid()
         return nullptr;
    uint flags = 0;
    if (options & TextureCanUseAtlas)     flags |= QSGRenderContext::CreateTexture_Atlas;
    if (options & TextureHasMipmaps)      flags |= QSGRenderContext::CreateTexture_Mipmap;
    if (!(options & TextureIsOpaque))     flags |= QSGRenderContext::CreateTexture_Alpha;
    return d->context->createTexture(image, flags);
}
 
QSGTexture *QQuickWindow::createTextureFromRhiTexture(QRhiTexture *texture, CreateTextureOptions options) const
{
    Q_D(const QQuickWindow);
    if (!d->rhi)
        return nullptr;
 
    QSGPlainTexture *t = new QSGPlainTexture;
    t->setOwnsTexture(true);
    t->setTexture(texture);
    t->setHasAlphaChannel(options & QQuickWindow::TextureHasAlphaChannel);
    t->setTextureSize(texture->pixelSize());
    return t;
}
 
// Legacy, private alternative to createTextureFromRhiTexture() that internally
// creates a QRhiTexture wrapping the existing native graphics resource.
// New code should prefer using the public API.
QSGTexture *QQuickWindowPrivate::createTextureFromNativeTexture(quint64 nativeObjectHandle,
                                                                int nativeLayoutOrState,
                                                                uint nativeFormat,
                                                                const QSize &size,
                                                                QQuickWindow::CreateTextureOptions options,
                                                                TextureFromNativeTextureFlags flags) const
{
    if (!rhi)
        return nullptr;
 
    QSGPlainTexture *texture = new QSGPlainTexture;
    texture->setTextureFromNativeTexture(rhi, nativeObjectHandle, nativeLayoutOrState, nativeFormat,
                                         size, options, flags);
    texture->setHasAlphaChannel(options & QQuickWindow::TextureHasAlphaChannel);
    // note that the QRhiTexture does not (and cannot) own the native object
    texture->setOwnsTexture(true); // texture meaning the QRhiTexture here, not the native object
    texture->setTextureSize(size);
    return texture;
}
 
void QQuickWindow::setColor(const QColor &color)
{
    Q_D(QQuickWindow);
    if (color == d->clearColor)
        return;
 
    if (color.alpha() != d->clearColor.alpha()) {
        QSurfaceFormat fmt = requestedFormat();
        if (color.alpha() < 255)
            fmt.setAlphaBufferSize(8);
        else
            fmt.setAlphaBufferSize(-1);
        setFormat(fmt);
    }
    d->clearColor = color;
    emit colorChanged(color);
    update();
}
 
QColor QQuickWindow::color() const
{
    return d_func()->clearColor;
}
 
bool QQuickWindow::hasDefaultAlphaBuffer()
{
    return QQuickWindowPrivate::defaultAlphaBuffer;
}
 
void QQuickWindow::setDefaultAlphaBuffer(bool useAlpha)
{
    QQuickWindowPrivate::defaultAlphaBuffer = useAlpha;
}
 
const QQuickWindow::GraphicsStateInfo &QQuickWindow::graphicsStateInfo()
{
    Q_D(QQuickWindow);
    if (d->rhi) {
        d->rhiStateInfo.currentFrameSlot = d->rhi->currentFrameSlot();
        d->rhiStateInfo.framesInFlight = d->rhi->resourceLimit(QRhi::FramesInFlight);
    }
    return d->rhiStateInfo;
}
 
void QQuickWindow::beginExternalCommands()
{
    Q_D(QQuickWindow);
    if (d->rhi && d->context && d->context->isValid()) {
        QSGDefaultRenderContext *rc = static_cast<QSGDefaultRenderContext *>(d->context);
        QRhiCommandBuffer *cb = rc->currentFrameCommandBuffer();
        if (cb)
            cb->beginExternal();
    }
}
 
void QQuickWindow::endExternalCommands()
{
    Q_D(QQuickWindow);
    if (d->rhi && d->context && d->context->isValid()) {
        QSGDefaultRenderContext *rc = static_cast<QSGDefaultRenderContext *>(d->context);
        QRhiCommandBuffer *cb = rc->currentFrameCommandBuffer();
        if (cb)
            cb->endExternal();
    }
}
 
void QQuickWindow::scheduleRenderJob(QRunnable *job, RenderStage stage)
{
    Q_D(QQuickWindow);
 
    d->renderJobMutex.lock();
    if (stage == BeforeSynchronizingStage) {
        d->beforeSynchronizingJobs << job;
    } else if (stage == AfterSynchronizingStage) {
        d->afterSynchronizingJobs << job;
    } else if (stage == BeforeRenderingStage) {
        d->beforeRenderingJobs << job;
    } else if (stage == AfterRenderingStage) {
        d->afterRenderingJobs << job;
    } else if (stage == AfterSwapStage) {
        d->afterSwapJobs << job;
    } else if (stage == NoStage) {
        if (d->renderControl && d->rhi && d->rhi->thread() == QThread::currentThread()) {
            job->run();
            delete job;
        } else if (isExposed()) {
            d->windowManager->postJob(this, job);
        } else {
            delete job;
        }
    }
    d->renderJobMutex.unlock();
}
 
void QQuickWindowPrivate::runAndClearJobs(QList<QRunnable *> *jobs)
{
    renderJobMutex.lock();
    QList<QRunnable *> jobList = *jobs;
    jobs->clear();
    renderJobMutex.unlock();
 
    for (QRunnable *r : std::as_const(jobList)) {
        r->run();
        delete r;
    }
}
 
void QQuickWindow::runJobsAfterSwap()
{
    Q_D(QQuickWindow);
    d->runAndClearJobs(&d->afterSwapJobs);
}
 
qreal QQuickWindow::effectiveDevicePixelRatio() const
{
    Q_D(const QQuickWindow);
    QWindow *w = QQuickRenderControl::renderWindowFor(const_cast<QQuickWindow *>(this));
    if (w)
        return w->devicePixelRatio();
 
    if (!d->customRenderTarget.isNull())
        return d->customRenderTarget.devicePixelRatio();
 
    return devicePixelRatio();
}
 
QSGRendererInterface *QQuickWindow::rendererInterface() const
{
    Q_D(const QQuickWindow);
 
    // no context validity check - it is essential to be able to return a
    // renderer interface instance before scenegraphInitialized() is emitted
    // (depending on the backend, that can happen way too late for some of the
    // rif use cases, like examining the graphics api or shading language in
    // use)
 
    return d->context->sceneGraphContext()->rendererInterface(d->context);
}
 
QRhi *QQuickWindow::rhi() const
{
    Q_D(const QQuickWindow);
    return d->rhi;
}
 
QRhiSwapChain *QQuickWindow::swapChain() const
{
    Q_D(const QQuickWindow);
    return d->swapchain;
}
 
void QQuickWindow::setGraphicsApi(QSGRendererInterface::GraphicsApi api)
{
    // Special cases: these are different scenegraph backends.
    switch (api) {
    case QSGRendererInterface::Software:
        setSceneGraphBackend(QStringLiteral("software"));
        break;
    case QSGRendererInterface::OpenVG:
        setSceneGraphBackend(QStringLiteral("openvg"));
        break;
    default:
        break;
    }
 
    // Standard case: tell the QRhi-based default adaptation what graphics api
    // (QRhi backend) to use.
    if (QSGRendererInterface::isApiRhiBased(api) || api == QSGRendererInterface::Unknown)
        QSGRhiSupport::instance_internal()->configure(api);
}
 
QSGRendererInterface::GraphicsApi QQuickWindow::graphicsApi()
{
    // Note that this applies the settings e.g. from the env vars
    // (QSG_RHI_BACKEND) if it was not done at least once already. Whereas if
    // setGraphicsApi() was called before, or the scene graph is already
    // initialized, then this is just a simple query.
    return QSGRhiSupport::instance()->graphicsApi();
}
 
void QQuickWindow::setSceneGraphBackend(const QString &backend)
{
    QSGContext::setBackend(backend);
}
 
QString QQuickWindow::sceneGraphBackend()
{
    return QSGContext::backend();
}
 
void QQuickWindow::setGraphicsDevice(const QQuickGraphicsDevice &device)
{
    Q_D(QQuickWindow);
    d->customDeviceObjects = device;
}
 
QQuickGraphicsDevice QQuickWindow::graphicsDevice() const
{
    Q_D(const QQuickWindow);
    return d->customDeviceObjects;
}
 
void QQuickWindow::setGraphicsConfiguration(const QQuickGraphicsConfiguration &config)
{
    Q_D(QQuickWindow);
    d->graphicsConfig = config;
}
 
QQuickGraphicsConfiguration QQuickWindow::graphicsConfiguration() const
{
    Q_D(const QQuickWindow);
    return d->graphicsConfig;
}
 
QSGRectangleNode *QQuickWindow::createRectangleNode() const
{
    Q_D(const QQuickWindow);
    return isSceneGraphInitialized() ? d->context->sceneGraphContext()->createRectangleNode() : nullptr;
}
 
QSGImageNode *QQuickWindow::createImageNode() const
{
    Q_D(const QQuickWindow);
    return isSceneGraphInitialized() ? d->context->sceneGraphContext()->createImageNode() : nullptr;
}
 
QSGNinePatchNode *QQuickWindow::createNinePatchNode() const
{
    Q_D(const QQuickWindow);
    return isSceneGraphInitialized() ? d->context->sceneGraphContext()->createNinePatchNode() : nullptr;
}
 
QQuickWindow::TextRenderType QQuickWindow::textRenderType()
{
    return QQuickWindowPrivate::textRenderType;
}
 
void QQuickWindow::setTextRenderType(QQuickWindow::TextRenderType renderType)
{
    QQuickWindowPrivate::textRenderType = renderType;
}
 
 
 
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug debug, const QQuickWindow *win)
{
    QDebugStateSaver saver(debug);
    debug.nospace();
    if (!win) {
        debug << "QQuickWindow(nullptr)";
        return debug;
    }
 
    debug << win->metaObject()->className() << '(' << static_cast<const void *>(win);
    if (win->isActive())
        debug << " active";
    if (win->isExposed())
        debug << " exposed";
    debug << ", visibility=" << win->visibility() << ", flags=" << win->flags();
    if (!win->title().isEmpty())
        debug << ", title=" << win->title();
    if (!win->objectName().isEmpty())
        debug << ", name=" << win->objectName();
    if (win->parent())
        debug << ", parent=" << static_cast<const void *>(win->parent());
    if (win->transientParent())
        debug << ", transientParent=" << static_cast<const void *>(win->transientParent());
    debug << ", geometry=";
    QtDebugUtils::formatQRect(debug, win->geometry());
    debug << ')';
    return debug;
}
#endif
 
QT_END_NAMESPACE
 
#include "qquickwindow.moc"
#include "moc_qquickwindow_p.cpp"
#include "moc_qquickwindow.cpp"