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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 "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
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