1 files changed, 125 insertions, 0 deletions
diff --git a/src/plugins/platforms/ios/qiosbackingstore.mm b/src/plugins/platforms/ios/qiosbackingstore.mm
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+++ b/src/plugins/platforms/ios/qiosbackingstore.mm
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qiosbackingstore.h"
+#include "qioswindow.h"
+
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QOpenGLPaintDevice>
+
+#include <QtDebug>
+
+QIOSBackingStore::QIOSBackingStore(QWindow *window)
+    : QPlatformBackingStore(window)
+    , m_context(new QOpenGLContext)
+    , m_device(0)
+{
+    m_context->setFormat(window->requestedFormat());
+    m_context->setScreen(window->screen());
+    m_context->create();
+}
+
+QIOSBackingStore::~QIOSBackingStore()
+{
+    delete m_context;
+    delete m_device;
+}
+
+void QIOSBackingStore::beginPaint(const QRegion &)
+{
+    // Needed to prevent QOpenGLContext::makeCurrent() from failing
+    window()->setSurfaceType(QSurface::OpenGLSurface);
+
+    m_context->makeCurrent(window());
+
+    static_cast<QOpenGLPaintDevice *>(paintDevice())->setSize(window()->size());
+    QIOSWindow *iosWindow = static_cast<QIOSWindow *>(window()->handle());
+    static_cast<QOpenGLPaintDevice *>(paintDevice())->setSize(window()->size() * iosWindow->devicePixelRatio());
+}
+
+QPaintDevice *QIOSBackingStore::paintDevice()
+{
+    if (!m_device) {
+        QIOSWindow *iosWindow = static_cast<QIOSWindow *>(window()->handle());
+        QOpenGLPaintDevice *openGLDevice = new QOpenGLPaintDevice(window()->size() * iosWindow->devicePixelRatio());
+        openGLDevice->setDevicePixelRatio(iosWindow->devicePixelRatio());
+        m_device = openGLDevice;
+    }
+
+    return m_device;
+}
+
+void QIOSBackingStore::flush(QWindow *window, const QRegion &region, const QPoint &offset)
+{
+    Q_UNUSED(region);
+    Q_UNUSED(offset);
+
+    if (window != this->window()) {
+        // We skip flushing raster-based child windows, to avoid the extra cost of copying from the
+        // parent FBO into the child FBO. Since the child is already drawn inside the parent FBO, it
+        // will become visible when flushing the parent. The only case we end up not supporting is if
+        // the child window overlaps a sibling window that's draws using a separate QOpenGLContext.
+        return;
+    }
+    m_context->swapBuffers(window);
+}
+
+void QIOSBackingStore::endPaint()
+{
+    // Calling makeDone() on the context here would be an option,
+    // but is not needed, and would actually add some overhead.
+}
+
+void QIOSBackingStore::resize(const QSize &size, const QRegion &staticContents)
+{
+    Q_UNUSED(staticContents);
+
+    // Resizing the backing store would in our case mean resizing the QWindow,
+    // as we cheat and use an QOpenGLPaintDevice that we target at the window.
+    // That's probably not what the user intended, so we ignore resizes of the
+    // backing store and always keep the paint device's size in sync with the
+    // window size in beginPaint().
+
+    if (size != window()->size())
+        qWarning() << "QIOSBackingStore needs to have the same size as its window";
+}
+
+QT_END_NAMESPACE