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#include "maskextruder.h"
#include <QImage>
#include <QDebug>
QT_BEGIN_NAMESPACE
MaskExtruder::MaskExtruder(QObject *parent) :
ParticleExtruder(parent)
, m_lastWidth(-1)
, m_lastHeight(-1)
{
}
QPointF MaskExtruder::extrude(const QRectF &r)
{
ensureInitialized(r);
if(!m_mask.count())
return r.topLeft();
const QPointF p = m_mask[rand() % m_mask.count()];
//### Should random sub-pixel positioning be added?
return p + r.topLeft();
}
void MaskExtruder::ensureInitialized(const QRectF &r)
{
if(m_lastWidth == r.width() && m_lastHeight == r.height())
return;
m_lastWidth = r.width();
m_lastHeight = r.height();
m_mask.clear();
if(m_source.isEmpty())
return;
QImage img(m_source.toLocalFile());
img = img.createAlphaMask();
img = img.convertToFormat(QImage::Format_Mono);//Else LSB, but I think that's easier
img = 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(img.pixelIndex(i,j))//Direct bit manipulation is presumably more efficient
m_mask << QPointF(i,j);
}
}
}
QT_END_NAMESPACE
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