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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)
{
QSurfaceFormat fmt = window->requestedFormat();
fmt.setDepthBufferSize(16);
fmt.setStencilBufferSize(8);
m_context->setFormat(fmt);
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());
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 ®ion, 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::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
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