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slow QPixmap::convertToImage

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il_cuffia

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Wednesday, February 8th 2006, 9:15pm

slow QPixmap::convertToImage

Hello folks,

I've grabbed some shots of a QWidget but noticed that QPixmap::convertToImage is *VERY* slow (>500 msecs per shot!).

I used the following canonical (naive?) code:

QPixmap pix = QPixmap::grabWidget(myWidget);
QImage img = pix.convertToImage();
// get RGB frame

I mean I need an RGB frame of the given widget:
is there a way to access rgb values in QPixmap (also using non portable X11 code)?
or is there a faster method to convert a QPixmap to a QImage (and then use QImage::pixel() | bits())?

AFAIK the problem is that I need an RGB frame, but only the QImage class has methods such as pixel() bits().

I am testing under KDE3.1/Qt3.1 on FedoraCore3.

thank in advance!