software: Add support for QSGRenderNode

Have to change getResource() a bit since it turns out it is not suitable
currently for backends that do not have a per-window rendercontext and do
not implement the interface on the rendercontext. Pass in the window to
make sure it can always figure out which window we want the resources for.
(we do not want rendererInterface() to return window-specific instances
created on the fly, with ownership issues, so stick with the simple model
where backends implement the interface on one of their existing classes)

To support clipping, QSGRenderNode::RenderState is extended accordingly.
Also updated the docs since some claims in the rendernode docs are not true
since Qt 5.3.

Change-Id: I34779c83926f5231b888fcab7131e873ae97964f
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/quick/scenegraph/adaptations/software/qsgsoftwarepixmaprenderer.cpp b/src/quick/scenegraph/adaptations/software/qsgsoftwarepixmaprenderer.cpp
index 304106a84d..f8c1a3d90b 100644
--- a/src/quick/scenegraph/adaptations/software/qsgsoftwarepixmaprenderer.cpp
+++ b/src/quick/scenegraph/adaptations/software/qsgsoftwarepixmaprenderer.cpp
@@ -38,6 +38,7 @@
 ****************************************************************************/
 
 #include "qsgsoftwarepixmaprenderer_p.h"
+#include "qsgsoftwarecontext_p.h"
 
 #include <QtQuick/QSGSimpleRectNode>
 
@@ -84,6 +85,9 @@ void QSGSoftwarePixmapRenderer::render(QPaintDevice *target)
     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;
 
     renderTimer.start();
     buildRenderList();
@@ -100,6 +104,7 @@ void QSGSoftwarePixmapRenderer::render(QPaintDevice *target)
     QRegion paintedRegion = renderNodes(&painter);
     qint64 renderTime = renderTimer.elapsed();
 
+    rc->m_activePainter = prevPainter;
     qCDebug(lcPixmapRenderer) << "pixmapRender" << paintedRegion << buildRenderListTime << optimizeRenderListTime << renderTime;
 }