Drawing a QPixmap transparently with QPainter

[ComServant]

Problem:

I have a QPixmap that already has an alpha channel. I want to use QPainter to drawPixmap() a QPixmap, but I want to draw it halfway transparent. I do not want to edit the QPixmap itself, unless I can easily undo the edit... thousands of times a frame.

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Scenario:

Basically, I already have a QGraphicsScene with plenty of transparent QPixmaps, but I want to temporarilly draw a number of them (but not all) transparently, in response to the user's actions.

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Question:

Can I get QPainter to transparently draw a QPixmap?

Something like: painter->drawPixmapTransparently(x, y, pixmap, transparency

Or:

Can I temporarily adjust the alpha of an entire QPixmap image, without permanently adjusting it's alpha channel?

Something like: pixmap->setAlpha(128)

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I've looked through the documentation (ofcourse), but I can't seem to find what I'm looking for. Since I'm not too familiar with QT, I'm hoping I've just overlooked the feature somewhere.

Thank you in advance!

[ChrisW67]

QPainter::setOpacity() perhaps?

[ComServant]

Yes, thank you, that was exactly what I was looking for. I was looking for 'alpha', and 'transparency'... but it was named 'opacity'. =)

Other APIs have similar, so I figured I must've just been overlooking it somewhere.

Thanks again, Chris, I apreciate the help.