Make direct rendering work after QPlatformScreenBuffer refactoring

Change-Id: Iebd082678264178987e2550370663ed2b44a8916
Reviewed-by: Andy Nichols <andy.nichols@nokia.com>

src/compositor/wayland_wrapper/wlcompositor.cpp

@@ -109,6 +109,7 @@ Compositor *Compositor::instance()
 Compositor::Compositor(WaylandCompositor *qt_compositor)
     : m_display(new Display)
     , m_default_input_device(0)
+    , m_pageFlipper(0)
     , m_shm(m_display)
     , m_current_frame(0)
     , m_last_queued_buf(-1)
@@ -158,12 +159,7 @@ Compositor::Compositor(WaylandCompositor *qt_compositor)
     QSocketNotifier *sockNot = new QSocketNotifier(fd, QSocketNotifier::Read, this);
     connect(sockNot, SIGNAL(activated(int)), this, SLOT(processWaylandEvents()));
 
-    m_pageFlipper = QGuiApplication::primaryScreen()->handle()->pageFlipper();
-    if (m_pageFlipper) {
-        connect(m_pageFlipper,SIGNAL(bufferReleased(QPlatformScreenBuffer*)),this,SLOT(releaseBuffer(QPlatformScreenBuffer*)));
-    }
-
-
+    qRegisterMetaType<SurfaceBuffer*>("SurfaceBuffer*");
     //initialize distancefieldglyphcache here
 }
 
@@ -330,6 +326,10 @@ void Compositor::enableSubSurfaceExtension()
 bool Compositor::setDirectRenderSurface(Surface *surface)
 {
 #ifdef QT_COMPOSITOR_WAYLAND_GL
+    if (!m_pageFlipper) {
+        m_pageFlipper = QGuiApplication::primaryScreen()->handle()->pageFlipper();
+    }
+
     if (m_graphics_hw_integration && m_graphics_hw_integration->setDirectRenderSurface(surface ? surface->waylandSurface() : 0)) {
         m_directRenderSurface = surface;
         return true;
@@ -436,7 +436,7 @@ void Compositor::feedRetainedSelectionData(QMimeData *data)
 
 void Compositor::scheduleReleaseBuffer(SurfaceBuffer *screenBuffer)
 {
-    QMetaObject::invokeMethod(this,"releaseBuffer",Q_ARG(SurfaceBuffer *,screenBuffer));
+    QMetaObject::invokeMethod(this,"releaseBuffer",Q_ARG(SurfaceBuffer*,screenBuffer));
 }
 
 void Compositor::overrideSelection(QMimeData *data)

src/compositor/wayland_wrapper/wlsurface.cpp

@@ -203,7 +203,7 @@ void Surface::sendFrameCallback()
         m_frontBuffer = m_backBuffer;
     }
 
-    advanceBufferQueue();
+    bool updateNeeded = advanceBufferQueue();
 
     uint time = Compositor::currentTimeMsecs();
     struct wl_resource *frame_callback;
@@ -211,10 +211,10 @@ void Surface::sendFrameCallback()
         wl_resource_post_event(frame_callback,WL_CALLBACK_DONE,time);
         wl_resource_destroy(frame_callback,Compositor::currentTimeMsecs());
     }
-
     wl_list_init(&m_frame_callback_list);
 
-    doUpdate();
+    if (updateNeeded)
+        doUpdate();
 }
 
 void Surface::frameFinished()
@@ -267,7 +267,7 @@ Compositor *Surface::compositor() const
     return m_compositor;
 }
 
-void Surface::advanceBufferQueue()
+bool Surface::advanceBufferQueue()
 {
     //has current buffer been displayed,
     //do we have another buffer in the queue
@@ -289,7 +289,7 @@ void Surface::advanceBufferQueue()
         }
 
         if (!m_backBuffer)
-            return; //we have no new backbuffer;
+            return false; //we have no new backbuffer;
 
        if (m_backBuffer->waylandBufferHandle()) {
             if (width != m_backBuffer->width() ||
@@ -311,9 +311,10 @@ void Surface::advanceBufferQueue()
 
     } else {
         m_backBuffer = 0;
+        return false;
     }
 
-
+    return true;
 }
 
 void Surface::doUpdate() {

src/compositor/wayland_wrapper/wlsurface.h

@@ -145,7 +145,7 @@ private:
     QSize m_size;
 
     inline SurfaceBuffer *currentSurfaceBuffer() const;
-    void advanceBufferQueue();
+    bool advanceBufferQueue();
     void doUpdate();
     SurfaceBuffer *createSurfaceBuffer(struct wl_buffer *buffer);
     void frameFinishedInternal();

src/compositor/wayland_wrapper/wlsurfacebuffer.cpp

@@ -118,7 +118,6 @@ void SurfaceBuffer::release()
 
 void SurfaceBuffer::scheduledRelease()
 {
-    qDebug() << Q_FUNC_INFO;
     m_page_flipper_has_buffer = false;
     if (!m_surface_has_buffer)
         destructBufferState();