Add shared memory image provider

Adds functionality to save CPU memory when several processes use the
same local image files.

Example and autotest will be added during stabilization.

Task-number: QTBUG-56279
Change-Id: Iabe1e42620c79adca4f61f3901da41d9d5a723df
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 58 insertions, 0 deletions

diff --git a/src/imports/sharedimage/sharedimageprovider.h b/src/imports/sharedimage/sharedimageprovider.h
new file mode 100644
index 0000000000..a2f6b6ef2f
--- /dev/null
+++ b/src/imports/sharedimage/sharedimageprovider.h
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SHAREDIMAGEPROVIDER_H
+#define SHAREDIMAGEPROVIDER_H
+
+#include <QQuickImageProvider>
+#include <QScopedPointer>
+
+class QuickSharedImageLoader;
+
+class SharedImageProvider : public QQuickImageProvider
+{
+public:
+    SharedImageProvider();
+
+    QImage requestImage(const QString &id, QSize *size, const QSize &requestedSize) override;
+
+protected:
+    QScopedPointer<QuickSharedImageLoader> loader;
+};
+#endif // SHAREDIMAGEPROVIDER_H