1 files changed, 165 insertions, 0 deletions
diff --git a/src/quick/scenegraph/adaptations/software/qsgsoftwarerenderer.cpp b/src/quick/scenegraph/adaptations/software/qsgsoftwarerenderer.cpp
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+++ b/src/quick/scenegraph/adaptations/software/qsgsoftwarerenderer.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQuick module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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_LOGGING_CATEGORY(lcRenderer, "qt.scenegraph.softwarecontext.renderer")
+
+QT_BEGIN_NAMESPACE
+
+QSGSoftwareRenderer::QSGSoftwareRenderer(QSGRenderContext *context)
+    : QSGAbstractSoftwareRenderer(context)
+    , m_paintDevice(nullptr)
+    , m_backingStore(nullptr)
+{
+}
+
+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(uint)
+{
+    class B : public QSGBindable
+    {
+    public:
+        void bind() const { }
+    } bindable;
+    QSGRenderer::renderScene(bindable);
+}
+
+void QSGSoftwareRenderer::render()
+{
+    if (!m_paintDevice && !m_backingStore)
+        return;
+
+    // If there is a backingstore, set the current paint device
+    if (m_backingStore) {
+        // For HiDPI QBackingStores, the paint device is not valid
+        // until begin() has been called. See: QTBUG-55875
+        m_backingStore->beginPaint(QRegion());
+        m_paintDevice = m_backingStore->paintDevice();
+        m_backingStore->endPaint();
+    }
+
+    QElapsedTimer renderTimer;
+
+    setBackgroundColor(clearColor());
+    setBackgroundSize(QSize(m_paintDevice->width() / m_paintDevice->devicePixelRatio(),
+                            m_paintDevice->height() / m_paintDevice->devicePixelRatio()));
+
+    // 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
+    if (m_backingStore != nullptr) {
+        m_backingStore->beginPaint(updateRegion);
+        // It is possible that a QBackingStore's paintDevice() will change
+        // when begin() is called.
+        m_paintDevice = m_backingStore->paintDevice();
+    }
+
+    QPainter painter(m_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();
+
+    if (m_backingStore != nullptr)
+        m_backingStore->endPaint();
+
+    rc->m_activePainter = prevPainter;
+    qCDebug(lcRenderer) << "render" << m_flushRegion << buildRenderListTime << optimizeRenderListTime << renderTime;
+}
+
+QT_END_NAMESPACE