qsgsoftwarepixmaprenderer.cpp

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// 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
 
#include "qsgsoftwarepixmaprenderer_p.h"
#include "qsgsoftwarecontext_p.h"
 
#include <QtQuick/QSGSimpleRectNode>
 
#include <QElapsedTimer>
 
Q_STATIC_LOGGING_CATEGORY(lcPixmapRenderer, "qt.scenegraph.softwarecontext.pixmapRenderer")
 
QT_BEGIN_NAMESPACE
 
QSGSoftwarePixmapRenderer::QSGSoftwarePixmapRenderer(QSGRenderContext *context)
    : QSGAbstractSoftwareRenderer(context)
{
 
}
 
QSGSoftwarePixmapRenderer::~QSGSoftwarePixmapRenderer()
{
 
}
 
void QSGSoftwarePixmapRenderer::renderScene()
{
    QSGRenderer::renderScene();
}
 
void QSGSoftwarePixmapRenderer::render()
{
 
}
 
void QSGSoftwarePixmapRenderer::render(QPaintDevice *target)
{
    QElapsedTimer renderTimer;
 
    // Setup background item
    setBackgroundRect(m_projectionRect.normalized(), qreal(1));
    setBackgroundColor(clearColor());
 
    renderTimer.start();
    buildRenderList();
    qint64 buildRenderListTime = renderTimer.restart();
 
    // Optimize Renderlist
    // Right now there is an assumption that when possible the same pixmap will
    // be reused.  So we can treat it like a backing store in that we can assume
    // that when the pixmap is not being resized, the data can be reused.  What is
    // different though is that everything should be marked as dirty on a resize.
    optimizeRenderList();
    qint64 optimizeRenderListTime = renderTimer.restart();
 
    if (!isOpaque() && target->devType() == QInternal::Pixmap) {
        // This fill here is wasteful, but necessary because it is the only way
        // to force a QImage based pixmap to have an alpha channel.
        static_cast<QPixmap *>(target)->fill(Qt::transparent);
    }
 
    QPainter painter(target);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setWindow(m_projectionRect);
    auto rc = static_cast<QSGSoftwareRenderContext *>(context());
    QPainter *prevPainter = rc->m_activePainter;
    rc->m_activePainter = &painter;
 
    QRegion paintedRegion = renderNodes(&painter);
    qint64 renderTime = renderTimer.elapsed();
 
    rc->m_activePainter = prevPainter;
    qCDebug(lcPixmapRenderer) << "pixmapRender" << paintedRegion << buildRenderListTime << optimizeRenderListTime << renderTime;
}
 
void QSGSoftwarePixmapRenderer::setProjectionRect(const QRect &projectionRect)
{
    m_projectionRect = projectionRect;
}
 
QT_END_NAMESPACE