Qt: Try to speed up SplashOverlay

Limit the amount of event processing SplashOverlay does. Let QWidget
take care of painting.

Change-Id: I9176baeba2cc9203e50c02029d85689f8908daba
Reviewed-on: https://code.wireshark.org/review/14771
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Gerald Combs <gerald@wireshark.org>

3 files changed, 9 insertions, 16 deletions

diff --git a/ui/qt/main_welcome.cpp b/ui/qt/main_welcome.cpp
index 696f681204..691a457b6b 100644
--- a/ui/qt/main_welcome.cpp
+++ b/ui/qt/main_welcome.cpp
@@ -188,7 +188,7 @@ MainWelcome::MainWelcome(QWidget *parent) :
 #if !defined(Q_OS_MAC) || QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
     // This crashes with Qt 4.8.3 on OS X.
     QGraphicsBlurEffect *blur = new QGraphicsBlurEffect(welcome_ui_->childContainer);
-    blur->setBlurRadius(1.3);
+    blur->setBlurRadius(2);
     welcome_ui_->childContainer->setGraphicsEffect(blur);
 #endif
 
diff --git a/ui/qt/splash_overlay.cpp b/ui/qt/splash_overlay.cpp
index a38fc1296f..fec318607a 100644
--- a/ui/qt/splash_overlay.cpp
+++ b/ui/qt/splash_overlay.cpp
@@ -62,7 +62,13 @@ SplashOverlay::SplashOverlay(QWidget *parent) :
     so_ui_->progressBar->setMaximum((int)register_count() + register_add);
     elapsed_timer_.start();
 
-    setPalette(Qt::transparent);
+    QColor bg = QColor(tango_aluminium_6);
+    bg.setAlphaF(0.4);
+    QPalette pal;
+    pal.setColor(QPalette::Background, bg);
+    setPalette(pal);
+    setAutoFillBackground(true);
+
     setStyleSheet(QString(
                       "QLabel {"
                       "  color: white;"
@@ -172,20 +178,10 @@ void SplashOverlay::splashUpdate(register_action_e action, const char *message)
 
     so_ui_->progressBar->setValue(register_cur_);
 
-    wsApp->processEvents();
+    wsApp->processEvents(QEventLoop::ExcludeUserInputEvents | QEventLoop::ExcludeSocketNotifiers, 1);
     elapsed_timer_.restart();
 }
 
-void SplashOverlay::paintEvent(QPaintEvent *)
-{
-    QPainter painter(this);
-
-    painter.setRenderHint(QPainter::Antialiasing);
-    painter.setBrush(QColor(tango_aluminium_6));
-    painter.setOpacity(0.4);
-    painter.drawRect(rect());
-}
-
 /*
  * Editor modelines
  *
diff --git a/ui/qt/splash_overlay.h b/ui/qt/splash_overlay.h
index 2cae0c1694..3aae85ff5a 100644
--- a/ui/qt/splash_overlay.h
+++ b/ui/qt/splash_overlay.h
@@ -45,9 +45,6 @@ public:
     explicit SplashOverlay(QWidget *parent = 0);
     ~SplashOverlay();
 
-protected:
-    void paintEvent(QPaintEvent *event);
-
 private:
     Ui::SplashOverlay *so_ui_;
     bool blurred_;