Improved and made public the QOpenGLPaintDevice API.

The new API is more flexible, allowing the use of QOpenGLPaintDevice
with any QOpenGLContext, and putting more responsibility on the user for
ensuring the correct FBO is current (the user knows best anyhow).

Task-number: QTBUG-21263

Change-Id: I50b954125f552baef52fbb3fe2ed907a11ad519c
Reviewed-on: http://codereview.qt-project.org/4325
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@nokia.com>

1 files changed, 103 insertions, 0 deletions

diff --git a/src/gui/opengl/qopenglpaintdevice.h b/src/gui/opengl/qopenglpaintdevice.h
new file mode 100644
index 0000000000..0f11595ca8
--- /dev/null
+++ b/src/gui/opengl/qopenglpaintdevice.h
@@ -0,0 +1,103 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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, Nokia gives you certain additional
+** rights. These rights are described in the Nokia 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QOPENGLPAINTDEVICE_H
+#define QOPENGLPAINTDEVICE_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of the QtGui module.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+
+#include <qpaintdevice.h>
+#include <QtGui/qopengl.h>
+#include <QtGui/qopenglcontext.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+class QOpenGLPaintDevicePrivate;
+
+class Q_GUI_EXPORT QOpenGLPaintDevice : public QPaintDevice
+{
+    Q_DECLARE_PRIVATE(QOpenGLPaintDevice)
+public:
+    QOpenGLPaintDevice(const QSize &size);
+    QOpenGLPaintDevice(int width, int height);
+    virtual ~QOpenGLPaintDevice();
+
+    int devType() const { return QInternal::OpenGL; }
+    QPaintEngine *paintEngine() const;
+
+    QOpenGLContext *context() const;
+    QSize size() const;
+
+    qreal dotsPerMeterX() const;
+    qreal dotsPerMeterY() const;
+
+    void setDotsPerMeterX(qreal);
+    void setDotsPerMeterY(qreal);
+
+    void setPaintFlipped(bool flipped);
+    bool paintFlipped() const;
+
+protected:
+    int metric(QPaintDevice::PaintDeviceMetric metric) const;
+
+    Q_DISABLE_COPY(QOpenGLPaintDevice)
+    QScopedPointer<QOpenGLPaintDevicePrivate> d_ptr;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QOPENGLPAINTDEVICE_H