device: Introduce hooks for the directfb plugin and use them

The EGL integration is vendor specific, add platform hooks to the
DirectFB plugin and implement them for the Broadcom 97425. The hook
interface is internal and there are no ABI/API gurantees.

Change-Id: I33359830c51f16895e771837fccb71e03c81cf18
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>

7 files changed, 226 insertions, 4 deletions

diff --git a/mkspecs/devices/linux-mipsel-broadcom-97425-g++/qdirectfbeglhooks_bcm97425.cpp b/mkspecs/devices/linux-mipsel-broadcom-97425-g++/qdirectfbeglhooks_bcm97425.cpp
new file mode 100644
index 0000000000..16aee0c4f7
--- /dev/null
+++ b/mkspecs/devices/linux-mipsel-broadcom-97425-g++/qdirectfbeglhooks_bcm97425.cpp
@@ -0,0 +1,71 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the qmake spec of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qdirectfbeglhooks.h"
+#include "qdirectfbconvenience.h"
+
+#include "default_directfb.h"
+
+// Exported to the directfb plugin
+QDirectFBEGLHooks platform_hook;
+static void *dbpl_handle;
+
+void QDirectFBEGLHooks::platformInit()
+{
+    DBPL_RegisterDirectFBDisplayPlatform(&dbpl_handle, QDirectFbConvenience::dfbInterface());
+}
+
+void QDirectFBEGLHooks::platformDestroy()
+{
+    DBPL_UnregisterDirectFBDisplayPlatform(&dbpl_handle);
+    dbpl_handle = 0;
+}
+
+bool QDirectFBEGLHooks::hasCapability(QPlatformIntegration::Capability cap) const
+{
+    switch (cap) {
+    case QPlatformIntegration::ThreadedOpenGL:
+        return true;
+    default:
+        return false;
+    }
+}
+
diff --git a/mkspecs/devices/linux-mipsel-broadcom-97425-g++/qmake.conf b/mkspecs/devices/linux-mipsel-broadcom-97425-g++/qmake.conf
index 866fad639b..ced323feba 100644
--- a/mkspecs/devices/linux-mipsel-broadcom-97425-g++/qmake.conf
+++ b/mkspecs/devices/linux-mipsel-broadcom-97425-g++/qmake.conf
@@ -62,4 +62,8 @@ DIRECTFB_LIBS           = -L$${BRCM_APPLIBS_PATH}/opensource/directfb/bin/Direct
 
 QMAKE_LFLAGS            += -Wl,-rpath-link,$$QMAKE_LIBDIR_OPENGL_ES2  -Wl,-rpath-link,$${BRCM_APPLIBS_PATH}/opensource/zlib/zlib-1.2.3
 
+# DirectFB platform hooks for this hardware
+QT_CONFIG += directfb_egl
+DIRECTFB_PLATFORM_HOOKS_SOURCES = $$PWD/qdirectfbeglhooks_bcm97425.cpp
+
 load(qt_config)
diff --git a/src/plugins/platforms/directfb/directfb.pro b/src/plugins/platforms/directfb/directfb.pro
index ae47ec397b..2251b8f278 100644
--- a/src/plugins/platforms/directfb/directfb.pro
+++ b/src/plugins/platforms/directfb/directfb.pro
@@ -30,15 +30,24 @@ HEADERS = qdirectfbintegration.h \
     qdirectfbinput.h \
     qdirectfbcursor.h \
     qdirectfbwindow.h \
-    qdirectfbscreen.h
+    qdirectfbscreen.h \
+    qdirectfbeglhooks.h
 
 # ### port the GL context
-directfbegl: {
+directfb_egl {
     HEADERS += qdirectfb_egl.h
     SOURCES += qdirectfb_egl.cpp
     DEFINES += DIRECTFB_GL_EGL
 }
 
+!isEmpty(DIRECTFB_PLATFORM_HOOKS_SOURCES) {
+    HEADERS += $$DIRECTFB_PLATFORM_HOOKS_HEADERS
+    SOURCES += $$DIRECTFB_PLATFORM_HOOKS_SOURCES
+    DEFINES += DIRECTFB_PLATFORM_HOOKS
+} else {
+    SOURCES += qdirectfbeglhooks_stub.cpp
+}
+
 
 CONFIG += qpa/genericunixfontdatabase
 target.path += $$[QT_INSTALL_PLUGINS]/platforms
diff --git a/src/plugins/platforms/directfb/qdirectfb_egl.cpp b/src/plugins/platforms/directfb/qdirectfb_egl.cpp
index ee0cbbae95..ac9142c0f4 100644
--- a/src/plugins/platforms/directfb/qdirectfb_egl.cpp
+++ b/src/plugins/platforms/directfb/qdirectfb_egl.cpp
@@ -42,6 +42,7 @@
 #include "qdirectfb_egl.h"
 #include "qdirectfbwindow.h"
 #include "qdirectfbscreen.h"
+#include "qdirectfbeglhooks.h"
 
 #include <QtGui/QOpenGLContext>
 #include <QtGui/QPlatformOpenGLContext>
@@ -54,6 +55,13 @@
 
 QT_BEGIN_NAMESPACE
 
+#ifdef DIRECTFB_PLATFORM_HOOKS
+extern QDirectFBEGLHooks platform_hook;
+static QDirectFBEGLHooks *hooks = &platform_hook;
+#else
+static QDirectFBEGLHooks *hooks = 0;
+#endif
+
 /**
  * This provides OpenGL ES 2.0 integration with DirectFB. It assumes that
  * one can adapt a DirectFBSurface as a EGLSurface. It might need some vendor
@@ -137,12 +145,14 @@ void QDirectFbScreenEGL::initializeEGL()
 
 void QDirectFbScreenEGL::platformInit()
 {
-    // Place vendor init code here.
+    if (hooks)
+        hooks->platformInit();
 }
 
 void QDirectFbScreenEGL::platformDestroy()
 {
-    // Place vendor finalize code here.
+    if (hooks)
+        hooks->platformDestroy();
 }
 
 QDirectFbWindowEGL::QDirectFbWindowEGL(QWindow *tlw, QDirectFbInput *input)
@@ -209,4 +219,12 @@ void QDirectFbIntegrationEGL::initializeScreen()
     screenAdded(m_primaryScreen.data());
 }
 
+bool QDirectFbIntegrationEGL::hasCapability(QPlatformIntegration::Capability cap) const
+{
+    // We assume that devices will have more and not less capabilities
+    if (hooks && hooks->hasCapability(cap))
+        return true;
+    return QDirectFbIntegration::hasCapability(cap);
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/directfb/qdirectfb_egl.h b/src/plugins/platforms/directfb/qdirectfb_egl.h
index 88f7e60e99..7781b17831 100644
--- a/src/plugins/platforms/directfb/qdirectfb_egl.h
+++ b/src/plugins/platforms/directfb/qdirectfb_egl.h
@@ -53,6 +53,8 @@ public:
     QPlatformWindow *createPlatformWindow(QWindow *window) const;
     QPlatformOpenGLContext *createPlatformOpenGLContext(QOpenGLContext *context) const;
 
+    bool hasCapability(QPlatformIntegration::Capability cap) const;
+
 protected:
     void initializeScreen();
 };
diff --git a/src/plugins/platforms/directfb/qdirectfbeglhooks.h b/src/plugins/platforms/directfb/qdirectfbeglhooks.h
new file mode 100644
index 0000000000..d0711b62dd
--- /dev/null
+++ b/src/plugins/platforms/directfb/qdirectfbeglhooks.h
@@ -0,0 +1,57 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QDIRECTFBEGL_HOOKS_H
+#define QDIRECTFBEGL_HOOKS_H
+
+#include "qplatformintegration_qpa.h"
+
+QT_BEGIN_NAMESPACE
+
+struct QDirectFBEGLHooks {
+    void platformInit();
+    void platformDestroy();
+    bool hasCapability(QPlatformIntegration::Capability) const;
+};
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/plugins/platforms/directfb/qdirectfbeglhooks_stub.cpp b/src/plugins/platforms/directfb/qdirectfbeglhooks_stub.cpp
new file mode 100644
index 0000000000..753a9d4372
--- /dev/null
+++ b/src/plugins/platforms/directfb/qdirectfbeglhooks_stub.cpp
@@ -0,0 +1,61 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qdirectfbeglhooks.h"
+
+/**
+ * This file is compiled in case there is no platform specific hook. On an
+ * optimizing compiler these functions should never be called.
+ */
+
+void QDirectFBEGLHooks::platformInit()
+{
+}
+
+void QDirectFBEGLHooks::platformDestroy()
+{
+}
+
+bool QDirectFBEGLHooks::hasCapability(QPlatformIntegration::Capability) const
+{
+    return false;
+}
+