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List:       kde-panel-devel
Subject:    [Panel-devel] A source of quite some "Cannot paint on a null
From:       Dmitry Suzdalev <dimsuz () gmail ! com>
Date:       2007-10-26 15:51:47
Message-ID: 200710261245.28146.dimsuz () gmail ! com
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Hi guys!

Having some free minutes I checked what causes a bunch of

QPainter::begin: Cannot paint on a null pixmap
QPainter::setWorldTransform: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::setCompositionMode: Painter not active
QPainter::setCompositionMode: Painter not active
QPainter::end: Painter not active, aborted
QPixmap: Invalid pixmap parameters
QPainter::begin: Cannot paint on a null pixmap
QPainter::setCompositionMode: Painter not active
QPainter::end: Painter not active, aborted

Plasma::Widget::paint() has this code:

    QPixmap pix;
    QPixmapCache::find(d->cacheKey, pix);

gdb reports that pix is null after this - i.e. not found in cache.
Later comes "if (d->cachePaintMode == ItemCoordinateCacheMode)" which isn't 
taken, program takes the route of:

    if (d->cachePaintMode == DeviceCoordinateCacheMode) {
 		....
		QPainter pixmapPainter(&pix);
		....
        }

Voila, the pix is null here.

I don't know plasma code at all, so just reporting the case. Please could 
someone look into this? :)
This happens right on the plasma startup.
Later paints seem to be ok, but the first ones are trying to paint on nothing 
:)

Hope this little bit helps.

Cheers,
Dmitry.
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