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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 "qcocoabackingstore.h"
#include <QtGui/QPainter>
#include "qcocoahelpers.h"
QT_BEGIN_NAMESPACE
QCocoaBackingStore::QCocoaBackingStore(QWindow *window)
: QPlatformBackingStore(window)
, m_cgImage(0)
{
}
QCocoaBackingStore::~QCocoaBackingStore()
{
CGImageRelease(m_cgImage);
m_cgImage = 0;
}
QPaintDevice *QCocoaBackingStore::paintDevice()
{
QCocoaWindow *cocoaWindow = static_cast<QCocoaWindow *>(window()->handle());
int windowDevicePixelRatio = int(cocoaWindow->devicePixelRatio());
// Receate the backing store buffer if the effective buffer size has changed,
// either due to a window resize or devicePixelRatio change.
QSize effectiveBufferSize = m_requestedSize * windowDevicePixelRatio;
if (m_qImage.size() != effectiveBufferSize) {
CGImageRelease(m_cgImage);
m_cgImage = 0;
QImage::Format format = (window()->format().hasAlpha() || cocoaWindow->m_drawContentBorderGradient)
? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
m_qImage = QImage(effectiveBufferSize, format);
m_qImage.setDevicePixelRatio(windowDevicePixelRatio);
if (format == QImage::Format_ARGB32_Premultiplied)
m_qImage.fill(Qt::transparent);
}
return &m_qImage;
}
void QCocoaBackingStore::flush(QWindow *win, const QRegion ®ion, const QPoint &offset)
{
// A flush means that qImage has changed. Since CGImages are seen as
// immutable, CoreImage fails to pick up this change for m_cgImage
// (since it usually cached), so we must recreate it. We await doing this
// until one of the views needs it, since, together with calling
// "setNeedsDisplayInRect" instead of "displayRect" we will, in most
// cases, get away with doing this once for every repaint. Also note that
// m_cgImage is only a reference to the data inside m_qImage, it is not a copy.
CGImageRelease(m_cgImage);
m_cgImage = 0;
if (!m_qImage.isNull()) {
if (QCocoaWindow *cocoaWindow = static_cast<QCocoaWindow *>(win->handle()))
[cocoaWindow->m_qtView flushBackingStore:this region:region offset:offset];
}
}
QImage QCocoaBackingStore::toImage() const
{
return m_qImage;
}
void QCocoaBackingStore::resize(const QSize &size, const QRegion &)
{
m_requestedSize = size;
}
bool QCocoaBackingStore::scroll(const QRegion &area, int dx, int dy)
{
extern void qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset);
const qreal devicePixelRatio = m_qImage.devicePixelRatio();
QPoint qpoint(dx * devicePixelRatio, dy * devicePixelRatio);
const QVector<QRect> qrects = area.rects();
for (int i = 0; i < qrects.count(); ++i) {
const QRect &qrect = QRect(qrects.at(i).topLeft() * devicePixelRatio, qrects.at(i).size() * devicePixelRatio);
qt_scrollRectInImage(m_qImage, qrect, qpoint);
}
return true;
}
qreal QCocoaBackingStore::getBackingStoreDevicePixelRatio()
{
return m_qImage.devicePixelRatio();
}
QT_END_NAMESPACE
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