xcb: Add experimental legacy support for native X11 painting

This commit revives the old native QPixmap and QPaintEngine
implementations that were present in Qt4. The backing store supports
regular raster windows in this commit. Support for render-to-texture
widgets and OpenGL compositing will be added in a follow-up commit.

Change-Id: I80a9c4f0c42a6f68f571dfee930d95000d5dd950
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

2 files changed, 55 insertions, 0 deletions

diff --git a/config.tests/x11/xrender/xrender.cpp b/config.tests/x11/xrender/xrender.cpp
new file mode 100644
index 0000000000..35203cc02c
--- /dev/null
+++ b/config.tests/x11/xrender/xrender.cpp
@@ -0,0 +1,52 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the config.tests 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
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <X11/Xlib.h>
+#include <X11/extensions/Xrender.h>
+
+#if RENDER_MAJOR == 0 && RENDER_MINOR < 5
+#  error "Required Xrender version 0.6 not found."
+#else
+int main(int, char **)
+{
+    XRenderPictFormat *format;
+    format = 0;
+    return 0;
+}
+#endif
diff --git a/config.tests/x11/xrender/xrender.pro b/config.tests/x11/xrender/xrender.pro
new file mode 100644
index 0000000000..ab5c5efa77
--- /dev/null
+++ b/config.tests/x11/xrender/xrender.pro
@@ -0,0 +1,3 @@
+SOURCES = xrender.cpp
+CONFIG += x11
+CONFIG -= qt