directfb: Access the screen layer through QWindow::screen()

Instead of assuming which layer was assigned to Qt, resolve the to
be used layer via QWindow::screen()->handle(). Add a method to the
DirectFB QPlatformScreen to provide a pointer to the IDirectFBDisplayLayer

Change-Id: Iaea9466ca84daff752a4932deafbe38f48123715
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

src/plugins/platforms/directfb/qdirectfbconvenience.cpp

@@ -41,9 +41,13 @@
 
 #include "qdirectfbconvenience.h"
 #include "qdirectfbblitter.h"
+#include "qdirectfbscreen.h"
 
 #include <private/qpixmap_blitter_p.h>
 
+#include <QtGui/QWindow>
+#include <QtGui/QScreen>
+
 IDirectFB *QDirectFbConvenience::dfbInterface()
 {
     static IDirectFB *dfb = 0;
@@ -378,3 +382,8 @@ QDirectFbKeyMap::QDirectFbKeyMap()
     insert(DIKS_CURLY_BRACKET_RIGHT   , Qt::Key_BraceRight);
     insert(DIKS_TILDE                 , Qt::Key_AsciiTilde);
 }
+
+QDirectFbScreen *toDfbScreen(QWindow *window)
+{
+    return static_cast<QDirectFbScreen*>(window->screen()->handle());
+}

src/plugins/platforms/directfb/qdirectfbconvenience.h

@@ -49,6 +49,9 @@
 
 #include <directfb.h>
 
+
+class QDirectFbScreen;
+
 class QDirectFbKeyMap: public QHash<DFBInputDeviceKeySymbol, Qt::Key>
 {
 public:
@@ -106,4 +109,7 @@ public:
     }
 };
 
+// Helper conversions from internal to DFB types
+QDirectFbScreen *toDfbScreen(QWindow *window);
+
 #endif // QDIRECTFBCONVENIENCE_H

src/plugins/platforms/directfb/qdirectfbscreen.cpp

@@ -63,5 +63,10 @@ QDirectFbScreen::QDirectFbScreen(int display)
     m_cursor.reset(new QDirectFBCursor(this));
 }
 
+IDirectFBDisplayLayer *QDirectFbScreen::dfbLayer() const
+{
+    return m_layer.data();
+}
+
 
 QT_END_NAMESPACE

src/plugins/platforms/directfb/qdirectfbscreen.h

@@ -62,6 +62,9 @@ public:
     QImage::Format format() const { return m_format; }
     QSizeF physicalSize() const { return m_physicalSize; }
 
+    // DirectFb helpers
+    IDirectFBDisplayLayer *dfbLayer() const;
+
 public:
     QRect m_geometry;
     int m_depth;

src/plugins/platforms/directfb/qdirectfbwindow.cpp

@@ -40,18 +40,21 @@
 ****************************************************************************/
 
 #include "qdirectfbwindow.h"
-#include "qdirectfbinput.h"
-
 #include "qdirectfbbackingstore.h"
+#include "qdirectfbinput.h"
+#include "qdirectfbscreen.h"
+
 
 #include <directfb.h>
 
 QDirectFbWindow::QDirectFbWindow(QWindow *tlw, QDirectFbInput *inputhandler)
     : QPlatformWindow(tlw), m_inputHandler(inputhandler)
 {
-    QDirectFBPointer<IDirectFBDisplayLayer> layer(QDirectFbConvenience::dfbDisplayLayer());
     DFBDisplayLayerConfig layerConfig;
-    layer->GetConfiguration(layer.data(), &layerConfig);
+    IDirectFBDisplayLayer *layer;
+
+    layer = toDfbScreen(tlw)->dfbLayer();
+    toDfbScreen(tlw)->dfbLayer()->GetConfiguration(layer, &layerConfig);
 
     DFBWindowDescription description;
     memset(&description,0,sizeof(DFBWindowDescription));
@@ -75,7 +78,7 @@ QDirectFbWindow::QDirectFbWindow(QWindow *tlw, QDirectFbInput *inputhandler)
     description.caps = DFBWindowCapabilities(DWCAPS_DOUBLEBUFFER|DWCAPS_ALPHACHANNEL);
     description.surface_caps = DSCAPS_PREMULTIPLIED;
 
-    DFBResult result = layer->CreateWindow(layer.data(), &description, m_dfbWindow.outPtr());
+    DFBResult result = layer->CreateWindow(layer, &description, m_dfbWindow.outPtr());
     if (result != DFB_OK) {
         DirectFBError("QDirectFbGraphicsSystemScreen: failed to create window",result);
     }