1 files changed, 113 insertions, 0 deletions
diff --git a/examples/widgets/painting/shared/fbopaintdevice.cpp b/examples/widgets/painting/shared/fbopaintdevice.cpp
new file mode 100644
index 0000000000..8207090cc8
--- /dev/null
+++ b/examples/widgets/painting/shared/fbopaintdevice.cpp
@@ -0,0 +1,113 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "fbopaintdevice.h"
+
+#include <QOffscreenSurface>
+#include <QOpenGLFunctions>
+
+QFboPaintDevice::QFboPaintDevice(const QSize& size, bool flipped, bool clearOnInit,
+                                 QOpenGLFramebufferObject::Attachment attachment)
+        : QOpenGLPaintDevice(size)
+{
+    QOpenGLFramebufferObjectFormat format;
+    format.setAttachment(attachment);
+    format.setSamples(4);
+    m_framebufferObject = new QOpenGLFramebufferObject(size, format);
+    QOffscreenSurface *surface = new QOffscreenSurface();
+    surface->create();
+    m_surface = surface;
+    setPaintFlipped(flipped);
+    if (clearOnInit) {
+        m_framebufferObject->bind();
+
+        context()->functions()->glClearColor(0, 0, 0, 0);
+        context()->functions()->glClear(GL_COLOR_BUFFER_BIT);
+    }
+}
+
+QFboPaintDevice::~QFboPaintDevice()
+{
+    delete m_framebufferObject;
+    delete m_surface;
+}
+
+void QFboPaintDevice::ensureActiveTarget()
+{
+    if (QOpenGLContext::currentContext() != context())
+        context()->makeCurrent(m_surface);
+
+    m_framebufferObject->bind();
+}
+
+GLuint QFboPaintDevice::takeTexture()
+{
+    // We have multisamples so we can't just forward takeTexture().
+    QOpenGLFramebufferObject resolvedFbo(m_framebufferObject->size(), m_framebufferObject->attachment());
+    QOpenGLFramebufferObject::blitFramebuffer(&resolvedFbo, m_framebufferObject);
+    return resolvedFbo.takeTexture();
+}
+
+QImage QFboPaintDevice::toImage() const
+{
+    QOpenGLContext* currentContext = QOpenGLContext::currentContext();
+    QSurface* currentSurface = currentContext ? currentContext->surface() : 0;
+
+    context()->makeCurrent(m_surface);
+
+    QImage image = m_framebufferObject->toImage(!paintFlipped());
+
+    if (currentContext)
+        currentContext->makeCurrent(currentSurface);
+    else
+        context()->doneCurrent();
+
+    return image;
+}