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/*
* Copyright (C) 2006 Dirk Mueller <mueller@kde.org>
* Copyright (C) 2006 Zack Rusin <zack@kde.org>
* Copyright (C) 2006 George Staikos <staikos@kde.org>
* Copyright (C) 2006 Simon Hausmann <hausmann@kde.org>
* Copyright (C) 2006 Allan Sandfeld Jensen <sandfeld@kde.org>
* Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
* Copyright (C) 2008 Dirk Schulze <vbs85@gmx.de>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TransparencyLayer_h
#define TransparencyLayer_h
#include <QPaintEngine>
#include <QPainter>
#include <QPixmap>
namespace WebCore {
struct TransparencyLayer {
WTF_MAKE_FAST_ALLOCATED;
public:
TransparencyLayer(const QPainter* p, const QRect &rect, qreal opacity, QPixmap& alphaMask)
: opacity(opacity)
, alphaMask(alphaMask)
, saveCounter(1) // see the comment for saveCounter
{
int devicePixelRatio = p->device()->devicePixelRatio();
pixmap = QPixmap(rect.width() * devicePixelRatio, rect.height() * devicePixelRatio);
pixmap.setDevicePixelRatio(devicePixelRatio);
offset = rect.topLeft();
pixmap.fill(Qt::transparent);
painter.begin(&pixmap);
painter.setRenderHints(p->renderHints());
painter.translate(-offset);
painter.setPen(p->pen());
painter.setBrush(p->brush());
painter.setTransform(p->transform(), true);
painter.setFont(p->font());
painter.setOpacity(1);
}
TransparencyLayer()
{
}
QPixmap pixmap;
QPoint offset;
QPainter painter;
qreal opacity;
// for clipToImageBuffer
QPixmap alphaMask;
// saveCounter is only used in combination with alphaMask
// otherwise, its value is unspecified
int saveCounter;
private:
TransparencyLayer(const TransparencyLayer &) {}
TransparencyLayer & operator=(const TransparencyLayer &) { return *this; }
};
} // namespace WebCore
#endif // TransparencyLayer_h
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