directfbegl: Add unimplemented QDirectFbWindow::eglSurface, build fix

QDirectFbScreen needs to have the full QDirectFbCursor definition, include
the header file directly instead of a forward declaration.

Impelement QDirectFbWindowEGL::eglSurface to return the EGLSurface of the
underlying DirectFBWindow.

Change-Id: Ib6765331ffea6e0b5f10f738d9e05320b7f8155f
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

src/plugins/platforms/directfb/qdirectfb_egl.cpp

@@ -48,6 +48,7 @@
 #include <QtGui/QScreen>
 
 #include <QtPlatformSupport/private/qeglplatformcontext_p.h>
+#include <QtPlatformSupport/private/qeglconvenience_p.h>
 
 #include <EGL/egl.h>
 
@@ -158,6 +159,20 @@ QDirectFbWindowEGL::~QDirectFbWindowEGL()
     }
 }
 
+EGLSurface QDirectFbWindowEGL::eglSurface()
+{
+    if (m_eglSurface == EGL_NO_SURFACE) {
+        QDirectFbScreenEGL *dfbScreen = static_cast<QDirectFbScreenEGL *>(screen());
+        EGLConfig config = q_configFromGLFormat(dfbScreen->eglDisplay(), format(), true);
+        m_eglSurface = eglCreateWindowSurface(dfbScreen->eglDisplay(), config, dfbSurface(), NULL);
+
+        if (m_eglSurface == EGL_NO_SURFACE)
+            eglGetError();
+    }
+
+    return m_eglSurface;
+}
+
 QSurfaceFormat QDirectFbWindowEGL::format() const
 {
     return window()->requestedFormat();

src/plugins/platforms/directfb/qdirectfbscreen.h

@@ -43,6 +43,7 @@
 #define QDIRECTFBSCREEN_H
 
 #include "qdirectfbconvenience.h"
+#include "qdirectfbcursor.h"
 
 #include <QtGui/QPlatformIntegration>
 
@@ -50,7 +51,6 @@
 
 QT_BEGIN_NAMESPACE
 
-class QDirectFBCursor;
 
 class QDirectFbScreen : public QPlatformScreen
 {