Reduce the number of paint events for QOpenGLWidget

Changes to other widgets in the window, especially special cases like
moving dock widgets around, trigger an unfortunately high number of
paint events and calls to paintGL(). Let's try to avoid this.

There is no need to send out a paint event to a texture-backed widget
when it was not explicitly dirtied. Overlaps won't matter since such
widgets are not part of the backingstore. Everything else has to work
like ordinary widgets, though, it is only the QPaintEvent sending we
can optimize away, nothing else.

Task-number: QTBUG-49466
Change-Id: I8ef294ba0a6c305d0002a80e85c06db2c2501cf8
Reviewed-by: Paul Olav Tvete <paul.tvete@theqtcompany.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/widgets/kernel/qwidgetbackingstore.cpp b/src/widgets/kernel/qwidgetbackingstore.cpp
index 9036c28b9a..6d43adc33b 100644
--- a/src/widgets/kernel/qwidgetbackingstore.cpp
+++ b/src/widgets/kernel/qwidgetbackingstore.cpp
@@ -1230,6 +1230,9 @@ void QWidgetBackingStore::doSync()
             QWidget *w = static_cast<QWidget *>(tl->source(i));
             if (dirtyRenderToTextureWidgets.contains(w)) {
                 const QRect rect = tl->geometry(i); // mapped to the tlw already
+                // Set a flag to indicate that the paint event for this
+                // render-to-texture widget must not to be optimized away.
+                w->d_func()->renderToTextureReallyDirty = 1;
                 dirty += rect;
                 toClean += rect;
             }