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List:       kde-bugs-dist
Subject:    [Bug 276116] Wallpaper slideshow - changing wallpaper increases cpu
From:       Jaime Torres <jtamate () gmail ! com>
Date:       2011-07-15 15:47:46
Message-ID: E1QhkcE-0005oe-NG () bugs ! kde ! org
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https://bugs.kde.org/show_bug.cgi?id=276116


Jaime Torres <jtamate@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |jtamate@gmail.com




--- Comment #1 from Jaime Torres <jtamate gmail com>  2011-07-15 15:47:46 ---
I've run callgrind to plasma-desktop when this wallpaper presentation is
enabled.
Most of the time is spent in Qt resizing the image to the current screen size.
(qSmoothScaleImage). The second CPU hungry method is to read the jpeg and
transform it to a Qt image. (QImage::ConverToFormat).

Therefore, two solutions to this problem:
Create a bug report to Qt about those methods being slow.

Change the images to be shown to the size of your screen with an image
manipulation program such as digikam, gimp,.... therefore, no need to scale the
image.

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