QPainter::drawRect in Qt4.5 is much slower than that in Qt4.3

[bgcrwf]

Dear borisbn,

In line 6 of your program, the QPixmap must be replaced with QBitmap to reproduce the program.
That is because I want to use the bitmap as a mask of the brush.
You can choose a monochrome picture to build the bitmap.

Actually, when I use QPixmap, the drawing performance is excellent (the same as yours).
But when I use QBitmap, the performance degrades a lot.
I think that it should be related to transparent drawing.
By the way, I can reproduce the problem in Qt4.6, too.

Thanks.

[borisbn]

ok, I changed QPixmap to QBitmap, and had this results:

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image was not clearly showed, time increased by 3 times, but it still not a 1 minute
can you attach your bitmap file xxx.pbm

[bgcrwf]

Hi,

I am glad to upload the image file.
It's in the attachments.

Thanks a lot.

[bgcrwf]

I've tested the peformace of Qt4.5 in windows environment.
It seemed that the problem only happened in Linux X11.

[pherthyl]

Please report: http://bugreports.qt.nokia.com