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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the Declarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickmaskextruder_p.h"
#include <QtQml/qqml.h>
#include <QtQml/qqmlinfo.h>
#include <QImage>
#include <QDebug>
QT_BEGIN_NAMESPACE
/*!
\qmlclass MaskShape QQuickMaskExtruder
\inqmlmodule QtQuick.Particles 2
\inherits Shape
\brief The MaskShape element allows you to represent an image as a shape to affectors and emitters.
*/
/*!
\qmlproperty url QtQuick.Particles2::MaskShape::source
The image to use as the mask. Areas with non-zero opacity
will be considered inside the shape.
*/
QQuickMaskExtruder::QQuickMaskExtruder(QObject *parent) :
QQuickParticleExtruder(parent)
, m_lastWidth(-1)
, m_lastHeight(-1)
{
}
void QQuickMaskExtruder::setSource(QUrl arg)
{
if (m_source != arg) {
m_source = arg;
m_lastHeight = -1;//Trigger reset
m_lastWidth = -1;
emit sourceChanged(arg);
startMaskLoading();
}
}
void QQuickMaskExtruder::startMaskLoading()
{
m_pix.clear(this);
if (m_source.isEmpty())
return;
m_pix.load(qmlEngine(this), m_source);
if (m_pix.isLoading())
m_pix.connectFinished(this, SLOT(finishMaskLoading()));
else
finishMaskLoading();
}
void QQuickMaskExtruder::finishMaskLoading()
{
if (m_pix.isError())
qmlInfo(this) << m_pix.error();
}
QPointF QQuickMaskExtruder::extrude(const QRectF &r)
{
ensureInitialized(r);
if (!m_mask.count() || m_img.isNull())
return r.topLeft();
const QPointF p = m_mask[rand() % m_mask.count()];
//### Should random sub-pixel positioning be added?
return p + r.topLeft();
}
bool QQuickMaskExtruder::contains(const QRectF &bounds, const QPointF &point)
{
ensureInitialized(bounds);//###Current usage patterns WILL lead to different bounds/r calls. Separate list?
if (m_img.isNull())
return false;
QPoint p = point.toPoint() - bounds.topLeft().toPoint();
return m_img.rect().contains(p) && (bool)m_img.pixelIndex(p);
}
void QQuickMaskExtruder::ensureInitialized(const QRectF &r)
{
if (m_lastWidth == r.width() && m_lastHeight == r.height())
return;//Same as before
if (!m_pix.isReady())
return;
m_lastWidth = r.width();
m_lastHeight = r.height();
m_mask.clear();
m_img = m_pix.image().createAlphaMask();
m_pix.clear();
m_img = m_img.convertToFormat(QImage::Format_Mono);//Else LSB, but I think that's easier
m_img = m_img.scaled(r.size().toSize());//TODO: Do they need aspect ratio stuff? Or tiling?
for (int i=0; i<r.width(); i++){
for (int j=0; j<r.height(); j++){
if (m_img.pixelIndex(i,j))//Direct bit manipulation is presumably more efficient
m_mask << QPointF(i,j);
}
}
}
QT_END_NAMESPACE
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