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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++
++ #include "qquickmaskextruder_p.h"
++ #include <QtQml/qqml.h>
++ #include <QtQml/qqmlinfo.h>
++ #include <QtQml/qqmlcontext.h>
++
++ #include <QImage>
++ #include <QDebug>
++ #include <QRandomGenerator>
++
++ QT_BEGIN_NAMESPACE
++ /*!
++ \qmltype MaskShape
++ \nativetype QQuickMaskExtruder
++ \inqmlmodule QtQuick.Particles
++ \inherits Shape
++ \brief For representing an image as a shape to affectors and emitters.
++ \ingroup qtquick-particles
++
++ */
++ /*!
++ \qmlproperty url QtQuick.Particles::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(const QUrl &arg)
++ {
++ if (m_source != arg) {
++ m_source = arg;
++
++ m_lastHeight = -1;//Trigger reset
++ m_lastWidth = -1;
++ emit sourceChanged(m_source);
++ startMaskLoading();
++ }
++ }
++
++ void QQuickMaskExtruder::startMaskLoading()
++ {
++ m_pix.clear(this);
++ if (m_source.isEmpty())
++ return;
++ const QQmlContext *context = qmlContext(this);
++ m_pix.load(context->engine(), context->resolvedUrl(m_source));
++ if (m_pix.isLoading())
++ m_pix.connectFinished(this, SLOT(finishMaskLoading()));
++ else
++ finishMaskLoading();
++ }
++
++ void QQuickMaskExtruder::finishMaskLoading()
++ {
++ if (m_pix.isError())
++ qmlWarning(this) << m_pix.error();
++ }
++
++ QPointF QQuickMaskExtruder::extrude(const QRectF &r)
++ {
++ ensureInitialized(r);
++ if (!m_mask.size() || m_img.isNull())
++ return r.topLeft();
++ const QPointF p = m_mask[QRandomGenerator::global()->bounded(m_mask.size())];
++ //### 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;
++
++ QPointF pt = point - bounds.topLeft();
++ QPoint p(pt.x() * m_img.width() / bounds.width(),
++ pt.y() * m_img.height() / bounds.height());
++ return m_img.rect().contains(p) && (m_img.pixel(p) & 0xff000000);
++ }
++
++ void QQuickMaskExtruder::ensureInitialized(const QRectF &rf)
++ {
++ // Convert to integer coords to avoid comparing floats and ints which would
++ // often result in rounding errors.
++ QRect r = rf.toRect();
++ 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();
++ // Image will in all likelyhood be in this format already, so
++ // no extra memory or conversion takes place
++ if (m_img.format() != QImage::Format_ARGB32 && m_img.format() != QImage::Format_ARGB32_Premultiplied)
++ m_img = std::move(m_img).convertToFormat(QImage::Format_ARGB32_Premultiplied);
++
++ // resample on the fly using 16-bit
++ int sx = (m_img.width() << 16) / r.width();
++ int sy = (m_img.height() << 16) / r.height();
++ int w = r.width();
++ int h = r.height();
++ for (int y=0; y<h; ++y) {
++ const uint *sl = (const uint *) m_img.constScanLine((y * sy) >> 16);
++ for (int x=0; x<w; ++x) {
++ if (sl[(x * sx) >> 16] & 0xff000000)
++ m_mask << QPointF(x, y);
++ }
++ }
++ }
++ QT_END_NAMESPACE
++
++ #include "moc_qquickmaskextruder_p.cpp"