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-rw-r--r--src/gui/painting/qbackingstore.cpp11
1 files changed, 9 insertions, 2 deletions
diff --git a/src/gui/painting/qbackingstore.cpp b/src/gui/painting/qbackingstore.cpp
index fbac811a..34df6c9 100644
--- a/src/gui/painting/qbackingstore.cpp
+++ b/src/gui/painting/qbackingstore.cpp
@@ -1517,13 +1517,20 @@ void QWidgetPrivate::repaint_sys(const QRegion &rgn)
extra->staticContentsSize = data.crect.size();
}
+ QPaintEngine *engine = q->paintEngine();
+ // QGLWidget does not support partial updates if:
+ // 1) The context is double buffered
+ // 2) The context is single buffered and auto-fill background is enabled.
+ const bool noPartialUpdateSupport = (engine && engine->type() == QPaintEngine::OpenGL)
+ && (usesDoubleBufferedGLContext || q->autoFillBackground());
+ QRegion toBePainted(noPartialUpdateSupport ? q->rect() : rgn);
+
#ifdef Q_WS_MAC
// No difference between update() and repaint() on the Mac.
- update_sys(rgn);
+ update_sys(toBePainted);
return;
#endif
- QRegion toBePainted(rgn);
toBePainted &= clipRect();
clipToEffectiveMask(toBePainted);
if (toBePainted.isEmpty())