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List:       kde-devel
Subject:    Re: colour cycling
From:       Uwe Thiem <uwix () iway ! na>
Date:       2006-08-23 19:08:01
Message-ID: 200608232008.01921.uwix () iway ! na
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On 23 August 2006 19:46, Thomas Lübking wrote:
> Am Mittwoch, 23. August 2006 10:31 schrieb Uwe Thiem:
> > Thanks a lot! It's about 10x as fast as crap.

That was meant to read as "my crap", of course. ;-)

>
> As mentioned - if you're painting lines or even filling areas the code  can
> become faster if you don't operate on an image and convert it to a pixmap.
> Only if you want to pass an individual value to each single pixel it's
> faster to operate on the image (allmost all the "painting" time goes to the
> conversion, writing the image data itself is fast)

Unfortunately, I have to operate on single pixels. So your stuff helped a lot.

Just wondering: QPixmap has to store its data somewhere somehow as well. 
Wouldn't it feasible to manipulate that directly too? Uh well, probably not. 
The data representation in there probably depends on architecture details. So 
direct access to it would be non-portable.

Anyway, I am happy for now. 

Uwe

-- 
Mark Twain: I rather decline two drinks than a German adjective.
http://www.SysEx.com.na
 
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