From f189b8934dc405cbd45258abc5aba2713428b1cc Mon Sep 17 00:00:00 2001
From: Matthew Vogt <matthew.vogt@nokia.com>
Date: Wed, 11 Apr 2012 16:54:33 +1000
Subject: Extract Particles code to an independent library

QtQuick clients that do not use particles features should not have
to load these classes.

Task-number: QTBUG-25178
Change-Id: Ib15f7655dc4d821595e06f9160d2770375279027
Reviewed-by: Glenn Watson <glenn.watson@nokia.com>
---
 src/particles/qquickmaskextruder.cpp | 141 +++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 src/particles/qquickmaskextruder.cpp

(limited to 'src/particles/qquickmaskextruder.cpp')

diff --git a/src/particles/qquickmaskextruder.cpp b/src/particles/qquickmaskextruder.cpp
new file mode 100644
index 0000000000..50b71749c0
--- /dev/null
+++ b/src/particles/qquickmaskextruder.cpp
@@ -0,0 +1,141 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtQuick 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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