[PySide] image format for best performance

Frank Rueter | OHUfx frank at ohufx.com
Sun May 27 12:31:42 CEST 2012

Cool, thanks for the tips Sebastian, will have a go at these!


On 27/05/12 10:24 PM, Sebastian Elsner wrote:
> I did not notice a speed difference in formats, but since you are bound
> to use QPixmaps or QIcons (dont use Qimage/qpicture, its for
> manipulation of image data), which you pass your icon path to, and thus
> instanciate and read the actual data, I am always using a simple cache
> algorithm which would remember the whole pixmap after loading the data.
> You can do this in a separate dict with itemname:QPixmap once per
> item/icon or if you are using come kind of itemmodel in the item used.
> So at least in most cases you dont have to load your icon data twice.
> For exmaple in a TreeView or TableView this greatly improves scrolling
> speed.
>    Am 26.05.2012 22:34, schrieb Frank Rueter | OHUfx:
>> Hi all,
>> is there a recommended image format to use to get best performance out
>> of QT?
>> I've got some animated widgets (sliding docks etc.) that are populated
>> with several small icons (currently 8bit pngs).
>> Since the animation is a bit jerky I will have to go hunting for ways
>> top optimise the code, and thought the image format for the icons would
>> be a good place to start.
>> Any experience and/or recommendations for this?
>> Cheers,
>> frank
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