centralize and fixup example sources install targets

This follows suit with aeb036e in qtbase.

Change-Id: Ie8580d0a1f38ab9858b0e44c9f99bdc552a1752a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: hjk <qthjk@ovi.com>

examples/multimedia/video/qmlvideofx/trace.h

@@ -0,0 +1,96 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** 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
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef TRACE_H
+#define TRACE_H
+
+#include <QtCore/QDebug>
+
+#define ENABLE_TRACE
+//#define VERBOSE_TRACE
+
+namespace Trace {
+
+class NullDebug
+{
+public:
+    template <typename T>
+    NullDebug& operator<<(const T&) { return *this; }
+};
+
+inline NullDebug nullDebug() { return NullDebug(); }
+
+template <typename T>
+struct PtrWrapper
+{
+    PtrWrapper(const T *ptr) : m_ptr(ptr) { }
+    const T *const m_ptr;
+};
+
+} // namespace Trace
+
+template <typename T>
+inline QDebug& operator<<(QDebug &debug, const Trace::PtrWrapper<T> &wrapper)
+{
+    debug.nospace() << "[" << (void*)wrapper.m_ptr << "]";
+    return debug.space();
+}
+
+template<typename T>
+inline const void *qtVoidPtr(const T *ptr)
+{ return static_cast<const void *>(ptr); }
+
+#define qtThisPtr() qtVoidPtr(this)
+
+#ifdef ENABLE_TRACE
+        inline QDebug qtTrace() { return qDebug() << "[qmlvideofx]"; }
+#    ifdef VERBOSE_TRACE
+        inline QDebug qtVerboseTrace() { return qtTrace(); }
+#    else
+        inline Trace::NullDebug qtVerboseTrace() { return Trace::nullDebug(); }
+#    endif
+#else
+    inline Trace::NullDebug qtTrace() { return Trace::nullDebug(); }
+    inline Trace::NullDebug qtVerboseTrace() { return Trace::nullDebug(); }
+#endif
+
+#endif // TRACE_H
+