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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qrasterbackingstore_p.h"
#include <QtGui/qbackingstore.h>
#include <QtGui/qpainter.h>
#include <private/qhighdpiscaling_p.h>
#include <qpa/qplatformwindow.h>
QT_BEGIN_NAMESPACE
QRasterBackingStore::QRasterBackingStore(QWindow *window)
: QPlatformBackingStore(window)
{
}
QRasterBackingStore::~QRasterBackingStore()
{
}
void QRasterBackingStore::resize(const QSize &size, const QRegion &staticContents)
{
Q_UNUSED(staticContents);
m_requestedSize = size;
}
QImage::Format QRasterBackingStore::format() const
{
if (window()->format().hasAlpha())
return QImage::Format_ARGB32_Premultiplied;
else
return QImage::Format_RGB32;
}
QPaintDevice *QRasterBackingStore::paintDevice()
{
return &m_image;
}
QImage QRasterBackingStore::toImage() const
{
return m_image;
}
bool QRasterBackingStore::scroll(const QRegion ®ion, int dx, int dy)
{
if (!QPlatformSurface::isRasterSurface(window()))
return false;
extern void qt_scrollRectInImage(QImage &, const QRect &, const QPoint &);
const qreal devicePixelRatio = m_image.devicePixelRatio();
const QPoint delta(dx * devicePixelRatio, dy * devicePixelRatio);
const QRect rect = region.boundingRect();
qt_scrollRectInImage(m_image, QRect(rect.topLeft() * devicePixelRatio, rect.size() * devicePixelRatio), delta);
return true;
}
void QRasterBackingStore::beginPaint(const QRegion ®ion)
{
qreal nativeWindowDevicePixelRatio = window()->handle()->devicePixelRatio();
QSize effectiveBufferSize = m_requestedSize * nativeWindowDevicePixelRatio;
if (m_image.devicePixelRatio() != nativeWindowDevicePixelRatio || m_image.size() != effectiveBufferSize) {
m_image = QImage(effectiveBufferSize, format());
m_image.setDevicePixelRatio(nativeWindowDevicePixelRatio);
if (m_image.hasAlphaChannel())
m_image.fill(Qt::transparent);
}
if (!m_image.hasAlphaChannel())
return;
QPainter painter(&m_image);
painter.setCompositionMode(QPainter::CompositionMode_Source);
for (const QRect &rect : region)
painter.fillRect(rect, Qt::transparent);
}
QT_END_NAMESPACE
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