qsgsoftwarerenderer.cpp

Enable keyboard shortcuts

// Copyright (C) 2016 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

// Qt-Security score:significant reason:default

#include "qsgsoftwarerenderer_p.h"

#include "qsgsoftwarerenderablenodeupdater_p.h"

#include "qsgsoftwarerenderlistbuilder_p.h"

#include "qsgsoftwarecontext_p.h"

#include "qsgsoftwarerenderablenode_p.h"

#include <QtGui/QPaintDevice>

#include <QtGui/QBackingStore>

#include <QElapsedTimer>

Q_STATIC_LOGGING_CATEGORY(lcRenderer, "qt.scenegraph.softwarecontext.renderer")

QT_BEGIN_NAMESPACE

QSGSoftwareRenderer::QSGSoftwareRenderer(QSGRenderContext *context)

    : QSGAbstractSoftwareRenderer(context)

    , m_paintDevice(nullptr)

    , m_backingStore(nullptr)

    // Check if the environment variable is set to force/disable partial updates

    static bool partialUpdateOverrideSet = false;

    static const int forcePartialUpdates = qEnvironmentVariableIntValue("QSG_SOFTWARE_RENDERER_FORCE_PARTIAL_UPDATES", &partialUpdateOverrideSet);

    if (partialUpdateOverrideSet) {

        if (forcePartialUpdates == 0)

            m_partialUpdateMode = DisablePartialUpdate;

        else

            m_partialUpdateMode = ForcePartialUpdate;

QSGSoftwareRenderer::~QSGSoftwareRenderer()

void QSGSoftwareRenderer::setCurrentPaintDevice(QPaintDevice *device)

    m_paintDevice = device;

    m_backingStore = nullptr;

QPaintDevice *QSGSoftwareRenderer::currentPaintDevice() const

    return m_paintDevice;

void QSGSoftwareRenderer::setBackingStore(QBackingStore *backingStore)

    m_backingStore = backingStore;

    m_paintDevice = nullptr;

QRegion QSGSoftwareRenderer::flushRegion() const

    return m_flushRegion;

void QSGSoftwareRenderer::renderScene()

    QSGRenderer::renderScene();

void QSGSoftwareRenderer::render()

    if (!m_paintDevice && !m_backingStore && !m_rt.paintDevice)

        return;

    QPaintDevice *paintDevice = m_paintDevice ? m_paintDevice : m_rt.paintDevice;

    QSize paintSize;

    qreal paintDevicePixelRatio = 1.0;

    if (paintDevice) {

        paintSize = QSize(paintDevice->width(), paintDevice->height());

        paintDevicePixelRatio = paintDevice->devicePixelRatio();

    } else {

        // For HiDPI QBackingStores, the paint device is valid between calls to

        // beginPaint() and endPaint(). See: QTBUG-55875

        m_backingStore->beginPaint(QRegion());

        const QPaintDevice *backingStorePaintDevice = m_backingStore->paintDevice();

        paintSize = QSize(backingStorePaintDevice->width(), backingStorePaintDevice->height());

        paintDevicePixelRatio = backingStorePaintDevice->devicePixelRatio();

        m_backingStore->endPaint();

    QElapsedTimer renderTimer;

    setBackgroundColor(clearColor());

    setBackgroundRect(QRect(0, 0,

                            paintSize.width() / paintDevicePixelRatio,

                            paintSize.height() / paintDevicePixelRatio),

                      paintDevicePixelRatio);

    // If paintDevicePixelRatio is not a whole number, opt to disable the partial update mechanism

    const bool nonIntegerRatio = !qFuzzyIsNull(paintDevicePixelRatio - qFloor(paintDevicePixelRatio));

    bool disablePartialUpdates = m_partialUpdateMode == DisablePartialUpdate || nonIntegerRatio;

    if (m_partialUpdateMode == ForcePartialUpdate)

        disablePartialUpdates = false;

    // Force the whole render area to be marked as dirty, avoiding any partial update

    if (disablePartialUpdates)

        markDirty();

    // Build Renderlist

    // The renderlist is created by visiting each node in the tree and when a

    // renderable node is reach, we find the coorosponding RenderableNode object

    // and append it to the renderlist.  At this point the RenderableNode object

    // should not need any further updating so it is just a matter of appending

    // RenderableNodes

    renderTimer.start();

    buildRenderList();

    qint64 buildRenderListTime = renderTimer.restart();

    // Optimize Renderlist

    // This is a pass through the renderlist to determine what actually needs to

    // be painted.  Without this pass the renderlist will simply render each item

    // from back to front, with a high potential for overdraw.  It would also lead

    // to the entire window being flushed every frame.  The objective of the

    // optimization pass is to only paint dirty nodes that are not occuluded.  A

    // side effect of this is that additional nodes may need to be marked dirty to

    // force a repaint.  It is also important that any item that needs to be

    // repainted only paints what is needed, via the use of clip regions.

    const QRegion updateRegion = optimizeRenderList();

    qint64 optimizeRenderListTime = renderTimer.restart();

    // If Rendering to a backingstore, prepare it to be updated

    bool usingBackingStore = false;

    if (!paintDevice) {

        m_backingStore->beginPaint(updateRegion);

        paintDevice = m_backingStore->paintDevice();

        usingBackingStore = true;

    QPainter painter(paintDevice);

    painter.setRenderHint(QPainter::Antialiasing);

    auto rc = static_cast<QSGSoftwareRenderContext *>(context());

    QPainter *prevPainter = rc->m_activePainter;

    rc->m_activePainter = &painter;

    // Render the contents Renderlist

    m_flushRegion = renderNodes(&painter);

    qint64 renderTime = renderTimer.elapsed();

    painter.end();

    if (usingBackingStore)

        m_backingStore->endPaint();

    rc->m_activePainter = prevPainter;

    qCDebug(lcRenderer) << "render" << m_flushRegion << buildRenderListTime << optimizeRenderListTime << renderTime;

QT_END_NAMESPACE