[Development] Proposal: Make QPen non-cosmetic by default

Uwe Rathmann Uwe.Rathmann at tigertal.de
Fri Oct 12 20:18:47 CEST 2012

On Fri, 12 Oct 2012 17:02:17 +0200, Samuel Rødal wrote:

> I'm not sure
> how valid that use case is these days though.

The use case I have in mind are oscilloscope alike widgets - for Qwt it 
is a very common one.

For a widget being updated several times a second it is completely 
unimportant if something is "less" precise, instead it has to display 
curves without flickering/stuttering.

Qt/Embedded is the platform where you find this type of widget most what 
usually means a combination of the weakest hardware and the slowest 
graphic path. Unfortunately the implementation of the subsurfaces concept 
is so very broken, that embedding OpenGL is no option.
Hope that using QPainter in combination with the scene graph opens a way 
to a faster implementation with Qt 5.


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