QImage copy on write

Question

is QImage based on QSharedData ? Do Qimage follow pimpl or copy on write ? e.g. would copying(through copy con or assignment) an Qimage make a deep copy of pixels ?

score 3 · Accepted Answer · answered Jul 23 '12 at 17:32

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QImage is copy on write. It will not copy pixels until you start modifying it.

For what it's worth when passing it into functions, I always use const QImage & anyway not to freak anyone out.

answered Jul 23 '12 at 17:32

MrFox

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A reference to documentation that proves your statement would be highly desirable. – liori Sep 03 '14 at 23:58
Late to the party, but [here](https://doc.qt.io/qt-5/qimage.html#details) you can read that `QImage` uses implicit data sharing. – Adversus Mar 12 '21 at 14:24

QImage copy on write

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