Android: refactor video renderer.

Removed the overhead of having to create a shared OpenGL context in the GUI
thread and pre-render the frame into a FBO.

We now directly render the GL_TEXTURE_EXTERNAL_OES in the QtQuick render
thread, using an Android-specific QSGVideoNode.
We also use a callback from the render thread to create the texture from
there and not have to create a separate shared OpenGL context.

Change-Id: I6c8eb94b47d0a03329c912701b8af3fb5ebd1876
Reviewed-by: Christian Stromme <christian.stromme@digia.com>

src/plugins/android/videonode/qandroidsgvideonode.h

@@ -0,0 +1,67 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
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+** This file is part of the Qt Toolkit.
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+** Licensees holding valid commercial Qt licenses may use this file in
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+** Alternatively, 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
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+** rights.  These rights are described in the Digia Qt LGPL Exception
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+** 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
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+****************************************************************************/
+
+#ifndef QANDROIDSGVIDEONODE_H
+#define QANDROIDSGVIDEONODE_H
+
+#include <private/qsgvideonode_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QAndroidSGVideoNodeMaterial;
+
+class QAndroidSGVideoNode : public QSGVideoNode
+{
+public:
+    QAndroidSGVideoNode(const QVideoSurfaceFormat &format);
+
+    void setCurrentFrame(const QVideoFrame &frame);
+    QVideoFrame::PixelFormat pixelFormat() const;
+
+private:
+    QVideoSurfaceFormat m_format;
+    QAndroidSGVideoNodeMaterial *m_material;
+    QVideoFrame m_frame;
+};
+
+QT_END_NAMESPACE
+
+#endif // QANDROIDSGVIDEONODE_H