Get rid of black flickering on resize

3 files changed, 9 insertions, 2 deletions

diff --git a/src/plugins/graphicssystems/testlite/qwindowsurface_testlite.cpp b/src/plugins/graphicssystems/testlite/qwindowsurface_testlite.cpp
index 0d277b8..d50a59e 100644
--- a/src/plugins/graphicssystems/testlite/qwindowsurface_testlite.cpp
+++ b/src/plugins/graphicssystems/testlite/qwindowsurface_testlite.cpp
@@ -86,6 +86,7 @@ void QTestLiteWindowSurface::flush(QWidget *widget, const QRegion &region, const
 
     //   qDebug() << "QTestLiteWindowSurface::flush:" << (long)this;
 
+    xw->painted = true; //there is content in the buffer
     xw->paintEvent();
 }
 
diff --git a/src/plugins/graphicssystems/testlite/x11util.cpp b/src/plugins/graphicssystems/testlite/x11util.cpp
index 7ad3ed5..20d4241 100644
--- a/src/plugins/graphicssystems/testlite/x11util.cpp
+++ b/src/plugins/graphicssystems/testlite/x11util.cpp
@@ -468,7 +468,7 @@ MyWindow::MyWindow(MyDisplay *display, int x, int y, int w, int h)
     currentCursor = -1;
 
     image_info = 0;
-
+    painted = false;
 }
 
 
@@ -517,8 +517,11 @@ void MyWindow::closeEvent()
 void MyWindow::paintEvent()
 {
 #ifdef MYX11_DEBUG
-    qDebug() << "MyWindow::paintEvent" << shm_img.size();
+    qDebug() << "MyWindow::paintEvent" << shm_img.size() << painted;
 #endif
+    if (!painted)
+        return;
+
 #ifdef DONT_USE_MIT_SHM
     // just convert the image every time...
     if (!shm_img.isNull()) {
@@ -596,6 +599,8 @@ void MyWindow::resizeShmImage(int width, int height)
     Q_ASSERT(shm_attach_status == True);
 
     shm_img = QImage( (uchar*) image->data, image->width, image->height, image->bytes_per_line, QImage::Format_RGB32 );
+
+    painted = false;
 #endif
 }
 
diff --git a/src/plugins/graphicssystems/testlite/x11util.h b/src/plugins/graphicssystems/testlite/x11util.h
index 76e029d..184c1ca 100644
--- a/src/plugins/graphicssystems/testlite/x11util.h
+++ b/src/plugins/graphicssystems/testlite/x11util.h
@@ -136,6 +136,7 @@ public: //###
     QTestLiteWindowSurface *windowSurface;
 
     int currentCursor;
+    bool painted;
 
 private:
     void resizeShmImage(int width, int height);