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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtQuick3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "floatingitemeffect.h"
#include "floatingitem.h"
#include "stereoview.h"
#include <QtGui/private/qgraphicseffect_p.h>
#include <QtGui/private/qgraphicsitem_p.h>
#include <QtGui/qdesktopwidget.h>
#include <QtGui/qapplication.h>
FloatingItemEffect::FloatingItemEffect(FloatingItem *parent)
: QGraphicsEffect(parent)
, m_item(parent)
, m_sourced(0)
{
}
FloatingItemEffect::~FloatingItemEffect()
{
}
QRectF FloatingItemEffect::boundingRectFor(const QRectF &sourceRect) const
{
qreal depth = qAbs(m_item->depth());
depth = depth * qApp->desktop()->logicalDpiX() / 100.0f;
return sourceRect.adjusted(-depth, -depth, depth, depth);
}
void FloatingItemEffect::draw(QPainter *painter)
{
// Correct the depth value for the screen's DPI. We treat 100 DPI
// as "normal" and scale the depth value accordingly. This way,
// the same number of millimeters are used on all displays viewed
// at the same viewing distance. A depth of 1 is 0.254 millimeters.
// Note: we should probably correct for viewing distance also.
qreal depth = m_item->depth() * painter->device()->logicalDpiX() / 100.0f;
// Determine which eye is being rendered by the StereoView.
StereoView *view = StereoView::findView(m_item);
QGL::Eye eye = view ? view->eye() : QGL::NoEye;
if (eye == QGL::NoEye || depth == 0.0f) {
// No eye being rendered or zero depth, so draw source as-is.
drawSource(painter);
} else if (eye == QGL::LeftEye) {
// Modify the effectTransform to adjust the position
// and draw the left eye version of the source.
QGraphicsItemPaintInfo *drawContext = m_sourced->info;
const QTransform *origTransform = drawContext->effectTransform;
QTransform transform(Qt::Uninitialized);
if (!origTransform) {
transform = QTransform::fromTranslate(depth / 2.0f, 0.0f);
} else {
transform = *origTransform;
transform.translate(depth / 2.0f, 0.0f);
}
drawContext->effectTransform = &transform;
drawSource(painter);
drawContext->effectTransform = origTransform;
} else {
// Modify the effectTransform to adjust the position
// and draw the right eye version of the source.
QGraphicsItemPaintInfo *drawContext = m_sourced->info;
const QTransform *origTransform = drawContext->effectTransform;
QTransform transform(Qt::Uninitialized);
if (!origTransform) {
transform = QTransform::fromTranslate(-depth / 2.0f, 0.0f);
} else {
transform = *origTransform;
transform.translate(-depth / 2.0f, 0.0f);
}
drawContext->effectTransform = &transform;
drawSource(painter);
drawContext->effectTransform = origTransform;
}
}
void FloatingItemEffect::sourceChanged(QGraphicsEffect::ChangeFlags flags)
{
if (flags & SourceAttached) {
QGraphicsEffectPrivate *ep =
static_cast<QGraphicsEffectPrivate *>
(QObjectPrivate::get(this));
m_sourced = static_cast<QGraphicsItemEffectSourcePrivate *>
(QObjectPrivate::get(ep->source));
} else if (flags & SourceDetached) {
m_sourced = 0;
}
}
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