Draw over an image, without replacing the pixels, save drawn image as standalone

[Charvi]

Okay so for erasing I did the following, may be this will be useful to someone.

QPainter painter(&m_mask);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.setPen(QPen(QBrush(Qt::transparent), myPenWidth, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));

QPainter painter(&m_mask);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.setPen(QPen(QBrush(Qt::transparent), myPenWidth, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));

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To understand the Composition Modes : http://doc.qt.io/qt-5/qpainter.html#...itionMode-enum


Thanks.

P.S.: Still working on the scrollarea stuff. Once done will update here.