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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** 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 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qiosbackingstore.h"
#include "qioswindow.h"
#include <QtGui/QOpenGLContext>
#include <QtGui/QOpenGLPaintDevice>
#include <QtGui/QOpenGLFramebufferObject>
#include <QtGui/QOffscreenSurface>
#include <QtGui/qpainter.h>
#include <QtGui/private/qwindow_p.h>
#include <QtDebug>
class QIOSPaintDevice : public QOpenGLPaintDevice
{
public:
QIOSPaintDevice(QIOSBackingStore *backingStore) : m_backingStore(backingStore) { }
void ensureActiveTarget() Q_DECL_OVERRIDE;
private:
QIOSBackingStore *m_backingStore;
};
void QIOSPaintDevice::ensureActiveTarget()
{
m_backingStore->makeCurrent();
}
QIOSBackingStore::QIOSBackingStore(QWindow *window)
: QRasterBackingStore(window)
, m_context(new QOpenGLContext)
, m_glDevice(nullptr)
{
QSurfaceFormat fmt = window->requestedFormat();
// Due to sharing QIOSContext redirects our makeCurrent on window() attempts to
// the global share context. Hence it is essential to have a compatible format.
fmt.setDepthBufferSize(QSurfaceFormat::defaultFormat().depthBufferSize());
fmt.setStencilBufferSize(QSurfaceFormat::defaultFormat().stencilBufferSize());
if (fmt.depthBufferSize() == 0)
qWarning("No depth in default format, expect rendering errors");
// We use the surface both for raster operations and for GL drawing (when
// we blit the raster image), so the type needs to cover both use cases.
if (window->surfaceType() == QSurface::RasterSurface)
window->setSurfaceType(QSurface::RasterGLSurface);
m_context->setFormat(fmt);
m_context->setScreen(window->screen());
Q_ASSERT(QOpenGLContext::globalShareContext());
m_context->setShareContext(QOpenGLContext::globalShareContext());
m_context->create();
}
QIOSBackingStore::~QIOSBackingStore()
{
delete m_context;
delete m_glDevice;
}
void QIOSBackingStore::makeCurrent()
{
if (!m_context->makeCurrent(window()))
qWarning("QIOSBackingStore: makeCurrent() failed");
}
void QIOSBackingStore::beginPaint(const QRegion ®ion)
{
makeCurrent();
if (!m_glDevice)
m_glDevice = new QIOSPaintDevice(this);
if (window()->surfaceType() == QSurface::RasterGLSurface)
QRasterBackingStore::beginPaint(region);
}
void QIOSBackingStore::endPaint()
{
}
QPaintDevice *QIOSBackingStore::paintDevice()
{
Q_ASSERT(m_glDevice);
// Keep paint device size and device pixel ratio in sync with window
qreal devicePixelRatio = window()->devicePixelRatio();
m_glDevice->setSize(window()->size() * devicePixelRatio);
m_glDevice->setDevicePixelRatio(devicePixelRatio);
if (window()->surfaceType() == QSurface::RasterGLSurface)
return QRasterBackingStore::paintDevice();
else
return m_glDevice;
}
void QIOSBackingStore::flush(QWindow *window, const QRegion ®ion, const QPoint &offset)
{
Q_ASSERT(!qt_window_private(window)->compositing);
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;
}
if (window->surfaceType() == QSurface::RasterGLSurface) {
QPainter painter(m_glDevice);
painter.drawImage(QPoint(), m_image);
}
m_context->makeCurrent(window);
m_context->swapBuffers(window);
}
void QIOSBackingStore::resize(const QSize &size, const QRegion &staticContents)
{
Q_UNUSED(staticContents);
if (window()->surfaceType() == QSurface::OpenGLSurface) {
// Resizing the backing store would in this case mean resizing the QWindow,
// as we 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() && !window()->inherits("QWidgetWindow"))
qWarning("QIOSBackingStore needs to have the same size as its window");
return;
}
QRasterBackingStore::resize(size, staticContents);
}
QT_END_NAMESPACE
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