1 files changed, 52 insertions, 18 deletions

diff --git a/src/quick/items/qquickwindow.cpp b/src/quick/items/qquickwindow.cpp
index 4a34adabe8..619c72afb8 100644
--- a/src/quick/items/qquickwindow.cpp
+++ b/src/quick/items/qquickwindow.cpp
@@ -74,6 +74,8 @@ QT_BEGIN_NAMESPACE
 
 extern Q_GUI_EXPORT QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha);
 
+bool QQuickWindowPrivate::defaultAlphaBuffer(0);
+
 void QQuickWindowPrivate::updateFocusItemTransform()
 {
     Q_Q(QQuickWindow);
@@ -87,44 +89,49 @@ void QQuickWindowPrivate::updateFocusItemTransform()
 #endif
 }
 
-
 class QQuickWindowIncubationController : public QObject, public QQmlIncubationController
 {
     Q_OBJECT
 
 public:
-    QQuickWindowIncubationController(const QQuickWindow *window)
-        : m_window(QQuickWindowPrivate::get(const_cast<QQuickWindow *>(window)))
+    QQuickWindowIncubationController(QSGRenderLoop *loop)
+        : m_renderLoop(loop), m_timer(0)
     {
         // Allow incubation for 1/3 of a frame.
         m_incubation_time = qMax(1, int(1000 / QGuiApplication::primaryScreen()->refreshRate()) / 3);
 
-        m_animation_driver = m_window->windowManager->animationDriver();
+        m_animation_driver = m_renderLoop->animationDriver();
         if (m_animation_driver) {
             connect(m_animation_driver, SIGNAL(stopped()), this, SLOT(animationStopped()));
-            connect(window, SIGNAL(frameSwapped()), this, SLOT(incubate()));
+            connect(m_renderLoop, SIGNAL(timeToIncubate()), this, SLOT(incubate()));
         }
     }
 
 protected:
-    virtual bool event(QEvent *e)
+    void timerEvent(QTimerEvent *)
     {
-        if (e->type() == QEvent::User) {
-            incubate();
-            return true;
+        killTimer(m_timer);
+        m_timer = 0;
+        incubate();
+    }
+
+    void incubateAgain() {
+        if (m_timer == 0) {
+            // Wait for a while before processing the next batch. Using a
+            // timer to avoid starvation of system events.
+            m_timer = startTimer(m_incubation_time);
         }
-        return QObject::event(e);
     }
 
 public slots:
     void incubate() {
         if (incubatingObjectCount()) {
-            if (m_animation_driver && m_animation_driver->isRunning()) {
+            if (m_renderLoop->interleaveIncubation()) {
                 incubateFor(m_incubation_time);
             } else {
                 incubateFor(m_incubation_time * 2);
                 if (incubatingObjectCount())
-                    QCoreApplication::postEvent(this, new QEvent(QEvent::User));
+                    incubateAgain();
             }
         }
     }
@@ -134,14 +141,15 @@ public slots:
 protected:
     virtual void incubatingObjectCountChanged(int count)
     {
-        if (count && (!m_animation_driver || !m_animation_driver->isRunning()))
-            QCoreApplication::postEvent(this, new QEvent(QEvent::User));
+        if (count && !m_renderLoop->interleaveIncubation())
+            incubateAgain();
     }
 
 private:
-    QQuickWindowPrivate *m_window;
+    QSGRenderLoop *m_renderLoop;
     int m_incubation_time;
     QAnimationDriver *m_animation_driver;
+    int m_timer;
 };
 
 #include "qquickwindow.moc"
@@ -347,6 +355,7 @@ QQuickWindowPrivate::QQuickWindowPrivate()
     , persistentGLContext(true)
     , persistentSceneGraph(true)
     , lastWheelEventAccepted(false)
+    , componentCompleted(true)
     , renderTarget(0)
     , renderTargetId(0)
     , incubationController(0)
@@ -2777,7 +2786,7 @@ QQmlIncubationController *QQuickWindow::incubationController() const
     Q_D(const QQuickWindow);
 
     if (!d->incubationController)
-        d->incubationController = new QQuickWindowIncubationController(this);
+        d->incubationController = new QQuickWindowIncubationController(d->windowManager);
     return d->incubationController;
 }
 
@@ -2969,7 +2978,7 @@ QSGTexture *QQuickWindow::createTextureFromId(uint id, const QSize &size, Create
     Setting the clear color has no effect when clearing is disabled.
     By default, the clear color is white.
 
-    \sa setClearBeforeRendering()
+    \sa setClearBeforeRendering(), setDefaultAlphaBuffer()
  */
 
 void QQuickWindow::setColor(const QColor &color)
@@ -2979,7 +2988,7 @@ void QQuickWindow::setColor(const QColor &color)
         return;
 
     if (color.alpha() != d->clearColor.alpha()) {
-        QSurfaceFormat fmt = format();
+        QSurfaceFormat fmt = requestedFormat();
         if (color.alpha() < 255)
             fmt.setAlphaBufferSize(8);
         else
@@ -2997,6 +3006,31 @@ QColor QQuickWindow::color() const
 }
 
 /*!
+    \brief Returns whether to use alpha transparency on newly created windows.
+
+    \since Qt 5.1
+    \sa setDefaultAlphaBuffer()
+ */
+bool QQuickWindow::hasDefaultAlphaBuffer()
+{
+    return QQuickWindowPrivate::defaultAlphaBuffer;
+}
+
+/*!
+    \brief \a useAlpha specifies whether to use alpha transparency on newly created windows.
+    \since Qt 5.1
+
+    In any application which expects to create translucent windows, it's
+    necessary to set this to true before creating the first QQuickWindow,
+    because all windows will share the same \l QOpenGLContext. The default
+    value is false.
+ */
+void QQuickWindow::setDefaultAlphaBuffer(bool useAlpha)
+{
+    QQuickWindowPrivate::defaultAlphaBuffer = useAlpha;
+}
+
+/*!
     \qmlproperty string QtQuick.Window2::Window::title
 
     The window's title in the windowing system.