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List:       kde-devel
Subject:    Re: how to do high performance image display
From:       Thomas =?iso-8859-1?q?L=FCbking?= <thomas.luebking () web ! de>
Date:       2006-06-14 18:36:30
Message-ID: 200606142036.31212.thomas.luebking () web ! de
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You might want to take a look at this.
http://www.kde-apps.org/content/show.php?content=40392

the viewer is only a demo for the class.
lib as soon as i fixed the api - until then just copy the header and src into 
your project

overlay support very soon (faster display but may issue with xgl etc.), qt4 
port: yes sure (i'll start it around next week or so, you can start it out 
today and mail me patches)

Thomas

Am Dienstag, 13. Juni 2006 22:34 schrieb Alexander Neundorf:
> Hi,
>
> for a Qt4 based application I need to display small images (like 500x500)
> at high frame rates (10..20 fps) and also huge images ( > 40 megabyte per
> image) at slow frame rates (0.3 .. 2 fps). It should be possible to zoom
> into the image and to scroll around.
> The data should not be copied around if possible. It is in RGB format.
>
> What's the best way to do this ?
> Simply using a QLabel together with a QPixmap and a QScrollArea ?
> Or should I create a QWidget and draw the image using QPainter from a
> QImage ? How do I deal with the double buffering of Qt4 ?
>
> Or should I fall back to plain X11 calls ?
> I guess the X video extensions don't help me, since AFAIK they offer only
> YUV modes (... but I have RGB data).
>
> Thanks in advance for any tips
> Alex

-- 
Fear... Fear attracts the fearfull.
The strong. The weak. The innocent. The corrupt.
Fear... Fear is my ally!
 
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