Add a SHM format converter class

This class helps keeing one lookuptable for server and client
It relies on that wayland-(client|server)-protocol.h being included
before the qwaylandshmformathelper.h

Change-Id: I12158126a80c8fef5c52427d35792f33716020f1
Reviewed-by: Giulio Camuffo <giulio.camuffo@jollamobile.com>

1 files changed, 138 insertions, 0 deletions

diff --git a/src/shared/qwaylandshmformathelper.h b/src/shared/qwaylandshmformathelper.h
new file mode 100644
index 000000000..131ad780d
--- /dev/null
+++ b/src/shared/qwaylandshmformathelper.h
@@ -0,0 +1,138 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
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+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
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+** conditions see http://qt.digia.com/licensing.  For further information
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+** 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.
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+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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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
+** ensure the GNU General Public License version 3.0 requirements will be
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+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWAYLANDSHMFORMATHELPER_H
+#define QWAYLANDSHMFORMATHELPER_H
+
+#include <QtGui/QImage>
+
+//the correct protocol header for the wayland server or wayland client has to be
+//included before this file is included
+
+QT_BEGIN_NAMESPACE
+
+class QWaylandShmFormatHelper
+{
+public:
+    static inline wl_shm_format fromQImageFormat(QImage::Format format);
+    static inline QImage::Format fromWaylandShmFormat(wl_shm_format format);
+    static inline QVector<wl_shm_format> supportedWaylandFormats();
+
+private:
+//IMPLEMENTATION (which has to be inline in the header because of the include trick)
+    struct Array
+    {
+        Array(const size_t size, const wl_shm_format *data)
+            : size(size)
+            , data(data)
+        { }
+        const size_t size;
+        const wl_shm_format *data;
+    };
+
+    static const Array getData()
+    {
+        static wl_shm_format formats_array[] = {
+            wl_shm_format(INT_MIN),    //Format_Invalid,
+            wl_shm_format(INT_MIN),    //Format_Mono,
+            wl_shm_format(INT_MIN),    //Format_MonoLSB,
+            wl_shm_format(INT_MIN),    //Format_Indexed8,
+            WL_SHM_FORMAT_XRGB8888,    //Format_RGB32,
+            WL_SHM_FORMAT_ARGB8888,    //Format_ARGB32,
+            WL_SHM_FORMAT_ARGB8888,    //Format_ARGB32_Premultiplied,
+            WL_SHM_FORMAT_RGB565,      //Format_RGB16,
+            wl_shm_format(INT_MIN),    //Format_ARGB8565_Premultiplied,
+            wl_shm_format(INT_MIN),    //Format_RGB666,
+            wl_shm_format(INT_MIN),    //Format_ARGB6666_Premultiplied,
+            WL_SHM_FORMAT_XRGB1555,    //Format_RGB555,
+            wl_shm_format(INT_MIN),    //Format_ARGB8555_Premultiplied,
+            WL_SHM_FORMAT_RGB888,      //Format_RGB888,
+            WL_SHM_FORMAT_XRGB4444,    //Format_RGB444,
+            WL_SHM_FORMAT_ARGB4444,    //Format_ARGB4444_Premultiplied,
+            WL_SHM_FORMAT_XBGR8888,    //Format_RGBX8888,
+            WL_SHM_FORMAT_ABGR8888,    //Format_RGBA8888,
+            WL_SHM_FORMAT_ABGR8888,    //Format_RGBA8888_Premultiplied,
+            WL_SHM_FORMAT_XBGR2101010, //Format_BGR30,
+            WL_SHM_FORMAT_ARGB2101010, //Format_A2BGR30_Premultiplied,
+            WL_SHM_FORMAT_XRGB2101010, //Format_RGB30,
+            WL_SHM_FORMAT_ARGB2101010, //Format_A2RGB30_Premultiplied,
+            WL_SHM_FORMAT_C8,          //Format_Alpha8,
+            WL_SHM_FORMAT_C8           //Format_Grayscale8,
+        };
+        const size_t size = sizeof(formats_array) / sizeof(*formats_array);
+        return Array(size, formats_array);
+    }
+};
+
+wl_shm_format QWaylandShmFormatHelper::fromQImageFormat(QImage::Format format)
+{
+    Array array = getData();
+    if (array.size <= size_t(format))
+        return wl_shm_format(INT_MIN);
+    return array.data[format];
+}
+
+QImage::Format QWaylandShmFormatHelper::fromWaylandShmFormat(wl_shm_format format)
+{
+    Array array = getData();
+    for (size_t i = 0; i < array.size; i++) {
+        if (array.data[i] == format)
+            return QImage::Format(i);
+    }
+    return QImage::Format_Invalid;
+}
+
+QVector<wl_shm_format> QWaylandShmFormatHelper::supportedWaylandFormats()
+{
+    QVector<wl_shm_format> retFormats;
+    Array array = getData();
+    for (size_t i = 0; i < array.size; i++) {
+        if (int(array.data[i]) != INT_MIN
+                && !retFormats.contains(array.data[i])) {
+            retFormats.append(array.data[i]);
+        }
+    }
+    return retFormats;
+}
+
+QT_END_NAMESPACE
+
+#endif //QWAYLANDSHMFORMATHELPER_H