File libqt5-reduce-paint-events-for-QOpenGLWidget.patch of Package libqt5-qtbase.1959

From 5c7f000cd4c9e3769e8cd4085cf0beee104f9886 Mon Sep 17 00:00:00 2001
From: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
Date: Wed, 18 Nov 2015 15:20:14 +0100
Subject: [PATCH] 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>
---
 src/widgets/kernel/qwidget.cpp             | 13 ++++++++++---
 src/widgets/kernel/qwidget_p.h             |  3 +++
 src/widgets/kernel/qwidgetbackingstore.cpp |  3 +++
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 0d07eed..94099aa 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -271,6 +271,9 @@ QWidgetPrivate::QWidgetPrivate(int version)
 #ifndef QT_NO_IM
       , inheritsInputMethodHints(0)
 #endif
+#ifndef QT_NO_OPENGL
+      , renderToTextureReallyDirty(1)
+#endif
 #if defined(Q_OS_WIN)
       , noPaintOnScreen(0)
 #endif
@@ -5547,7 +5550,7 @@ void QWidgetPrivate::drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QP
                      << "geometry ==" << QRect(q->mapTo(q->window(), QPoint(0, 0)), q->size());
 #endif
 
-            bool grabbed = false;
+            bool skipPaintEvent = false;
 #ifndef QT_NO_OPENGL
             if (renderToTexture) {
                 // This widget renders into a texture which is composed later. We just need to
@@ -5561,14 +5564,18 @@ void QWidgetPrivate::drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QP
                     } else {
                         // We are not drawing to a backingstore: fall back to QImage
                         p.drawImage(q->rect(), grabFramebuffer());
-                        grabbed = true;
+                        skipPaintEvent = true;
                     }
                     endBackingStorePainting();
                 }
+                if (renderToTextureReallyDirty)
+                    renderToTextureReallyDirty = 0;
+                else
+                    skipPaintEvent = true;
             }
 #endif // QT_NO_OPENGL
 
-            if (!grabbed) {
+            if (!skipPaintEvent) {
                 //actually send the paint event
                 sendPaintEvent(toBePainted);
             }
diff --git a/src/widgets/kernel/qwidget_p.h b/src/widgets/kernel/qwidget_p.h
index a78cf09..7eb8d04 100644
--- a/src/widgets/kernel/qwidget_p.h
+++ b/src/widgets/kernel/qwidget_p.h
@@ -743,6 +743,9 @@ public:
 #ifndef QT_NO_IM
     uint inheritsInputMethodHints : 1;
 #endif
+#ifndef QT_NO_OPENGL
+    uint renderToTextureReallyDirty : 1;
+#endif
 
     // *************************** Platform specific ************************************
 #if defined(Q_OS_WIN)
diff --git a/src/widgets/kernel/qwidgetbackingstore.cpp b/src/widgets/kernel/qwidgetbackingstore.cpp
index 9036c28..6d43adc 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;
             }
-- 
2.6.4