Introduce QOpenGLWindow

[ChangeLog] Added QOpenGLWindow. This serves as a convenience class for
creating windows showing OpenGL content via an API similar to QGLWidget
and without any widget dependencies.

Done-with: Jorgen Lind <jorgen.lind@digia.com>
Task-number: QTBUG-36899
Change-Id: I52e9bc61acb129dbfd3841b3adeffab2dbcf7f05
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

1 files changed, 100 insertions, 0 deletions

diff --git a/src/gui/kernel/qopenglwindow.h b/src/gui/kernel/qopenglwindow.h
new file mode 100644
index 0000000000..294bd90116
--- /dev/null
+++ b/src/gui/kernel/qopenglwindow.h
@@ -0,0 +1,100 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtGui module 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 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 QOPENGLWINDOW_H
+#define QOPENGLWINDOW_H
+
+#include <QtGui/QPaintDeviceWindow>
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QImage>
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGLWindowPrivate;
+
+class Q_GUI_EXPORT QOpenGLWindow : public QPaintDeviceWindow
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE(QOpenGLWindow)
+
+public:
+    enum UpdateBehavior {
+        NoPartialUpdate,
+        PartialUpdateBlit,
+        PartialUpdateBlend
+    };
+
+    explicit QOpenGLWindow(UpdateBehavior updateBehavior = NoPartialUpdate, QWindow *parent = 0);
+
+    UpdateBehavior updateBehavior() const;
+    bool isValid() const;
+
+    void makeCurrent();
+    void doneCurrent();
+
+    QOpenGLContext *context() const;
+
+    GLuint defaultFramebufferObject() const;
+
+    QImage grabFramebuffer();
+
+Q_SIGNALS:
+    void frameSwapped();
+
+protected:
+    virtual void initializeGL();
+    virtual void resizeGL(int w, int h);
+    virtual void paintGL();
+    virtual void paintUnderGL();
+    virtual void paintOverGL();
+
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
+    int metric(PaintDeviceMetric metric) const Q_DECL_OVERRIDE;
+    QPaintDevice *redirected(QPoint *) const Q_DECL_OVERRIDE;
+
+private:
+    Q_DISABLE_COPY(QOpenGLWindow)
+};
+
+QT_END_NAMESPACE
+
+#endif