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List:       kde-devel
Subject:    QPixmap::fill() slowness
From:       Aurélien_Gâteau <aurelien.gateau () free ! fr>
Date:       2008-05-23 8:17:57
Message-ID: 48367DB5.2070805 () free ! fr
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Hello,

I need to create a fully transparent QPixmap. The way I do so is:

QPixmap pix(width, height);
pix.fill(Qt::transparent);

Unfortunately, this is quite slow.
Stepping through the code of QPixmap::fill() gets me in 
QX11PixmapData::fill(). In this method I can see a very interesting 
XRender version, but I don't get to use it because my pixmap depth is 24 
, not 32. Instead, the code creates a transparent QImage and converts it 
to a QPixmap.

Any idea how to get a transparent QPixmap in a faster way?

Aurélien

PS: I am using qt-copy
 
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