What is the painter object working on? Is it a pixmap, a widget or what?
The "Q"
Re: how to clean data in qimage with transparent?
What is the painter object working on? Is it a pixmap, a widget or what?
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Beginner
Re: how to clean data in qimage with transparent?
painter works on QImage.
The "Q"
Re: how to clean data in qimage with transparent?
Why don't you just create an empty QImage and draw on that instead of clearing the one you have?
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Beginner
Re: how to clean data in qimage with transparent?
In my case, I have to update the image every serveral milliseconds, only part of the image should be erased and repainted. so I think create a new QImage is infeasible.
The "Q"
Re: how to clean data in qimage with transparent?
In that case you should indeed use Clear composition mode.
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rolandsun (13th June 2012)
Beginner
Re: how to clean data in qimage with transparent?
Finally QPainter::CompositionMode_Source works ,thanks.
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