142 lines
4.3 KiB
C++
142 lines
4.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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**
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** This file is part of the QtQuick module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** Other Usage
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qquickmaskextruder_p.h"
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#include <QtQml/qqml.h>
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#include <QtQml/qqmlinfo.h>
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#include <QImage>
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#include <QDebug>
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QT_BEGIN_NAMESPACE
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/*!
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\qmlclass MaskShape QQuickMaskExtruder
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\inqmlmodule QtQuick.Particles 2
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\inherits Shape
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\brief The MaskShape element allows you to represent an image as a shape to affectors and emitters.
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*/
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/*!
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\qmlproperty url QtQuick.Particles2::MaskShape::source
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The image to use as the mask. Areas with non-zero opacity
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will be considered inside the shape.
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*/
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QQuickMaskExtruder::QQuickMaskExtruder(QObject *parent) :
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QQuickParticleExtruder(parent)
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, m_lastWidth(-1)
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, m_lastHeight(-1)
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{
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}
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void QQuickMaskExtruder::setSource(QUrl arg)
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{
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if (m_source != arg) {
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m_source = arg;
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m_lastHeight = -1;//Trigger reset
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m_lastWidth = -1;
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emit sourceChanged(arg);
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startMaskLoading();
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}
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}
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void QQuickMaskExtruder::startMaskLoading()
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{
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m_pix.clear(this);
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if (m_source.isEmpty())
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return;
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m_pix.load(qmlEngine(this), m_source);
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if (m_pix.isLoading())
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m_pix.connectFinished(this, SLOT(finishMaskLoading()));
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else
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finishMaskLoading();
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}
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void QQuickMaskExtruder::finishMaskLoading()
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{
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if (m_pix.isError())
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qmlInfo(this) << m_pix.error();
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}
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QPointF QQuickMaskExtruder::extrude(const QRectF &r)
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{
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ensureInitialized(r);
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if (!m_mask.count() || m_img.isNull())
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return r.topLeft();
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const QPointF p = m_mask[rand() % m_mask.count()];
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//### Should random sub-pixel positioning be added?
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return p + r.topLeft();
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}
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bool QQuickMaskExtruder::contains(const QRectF &bounds, const QPointF &point)
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{
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ensureInitialized(bounds);//###Current usage patterns WILL lead to different bounds/r calls. Separate list?
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if (m_img.isNull())
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return false;
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QPoint p = point.toPoint() - bounds.topLeft().toPoint();
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return m_img.rect().contains(p) && (bool)m_img.pixelIndex(p);
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}
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void QQuickMaskExtruder::ensureInitialized(const QRectF &r)
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{
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if (m_lastWidth == r.width() && m_lastHeight == r.height())
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return;//Same as before
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if (!m_pix.isReady())
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return;
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m_lastWidth = r.width();
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m_lastHeight = r.height();
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m_mask.clear();
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m_img = m_pix.image().createAlphaMask();
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m_pix.clear();
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m_img = m_img.convertToFormat(QImage::Format_Mono);//Else LSB, but I think that's easier
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m_img = m_img.scaled(r.size().toSize());//TODO: Do they need aspect ratio stuff? Or tiling?
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for (int i=0; i<r.width(); i++){
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for (int j=0; j<r.height(); j++){
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if (m_img.pixelIndex(i,j))//Direct bit manipulation is presumably more efficient
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m_mask << QPointF(i,j);
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}
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}
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}
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QT_END_NAMESPACE
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