Enable support for OpenVG

This commit re-enables support for OpenVG in Qt, but not in the
same way as in Qt 4.8.  The first part is about adding a test
and using the new configure system to enable OpenVG.

There is still support code in Qt for setting up EGL to provide a
surface and context for rendering with the OpenVG API, this commit
enables a path to do so.

Normally to get access to an EGLContext from a QWindow you do so via
QOpenGLContext, but in setups without OpenGL but with EGL and OpenVG
this doesn't make sense (there would be no QOpenGLContext). So the
intended way is to use a QWindow to get an EGLSurface, then create
an EGLContext directly (without going through QPA).

Change-Id: I0f75aadbaa3cd006deb7e6fd12cfbb574870fba4
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

2 files changed, 52 insertions, 0 deletions

diff --git a/config.tests/unix/openvg/openvg.cpp b/config.tests/unix/openvg/openvg.cpp
new file mode 100644
index 0000000000..f9cf7786ab
--- /dev/null
+++ b/config.tests/unix/openvg/openvg.cpp
@@ -0,0 +1,49 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation 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 <VG/openvg.h>
+
+
+int main(int, char **)
+{
+    VGint i;
+    i = 2;
+    vgFlush();
+    return 0;
+}
diff --git a/config.tests/unix/openvg/openvg.pro b/config.tests/unix/openvg/openvg.pro
new file mode 100644
index 0000000000..1933e3789c
--- /dev/null
+++ b/config.tests/unix/openvg/openvg.pro
@@ -0,0 +1,3 @@
+SOURCES += openvg.cpp
+
+CONFIG -= qt