Background for login, splash, and lockscreen

[Jens Reuterberg]

Ok so I have to ask (because my mum once told me as a child, slow people ask a 
lot of questions - but only complete idiots don't) :)

Place be nice.

Wouldn't it be possible to have the wallpaper picker pick the login wallpaper 
as well? I mean say I choose a wallpaper with a photo of a dog or something - 
can't the wallpaper picker, blur it with gaussian blur at the time of picking, 
saving it in a special folder and at the same time deleting the past blurred 
wallpaper? 

So that when you log in you have your current wallpaper, blured as background?

/Jens

On Sunday 22 June 2014 20.57.11 Martin Graesslin wrote:
> On Saturday 21 June 2014 16:18:10 Kai Uwe Broulik wrote:
> > Can't we just use QtGraphicalEffects and just blur (and/or desaturate
> > and/or darken) whatever picture the user has chosen?
> > 
> > The overall performance of these is great (at least on Android which is
> > slow in any other QtQuick respect) but their instantiation takes ages, so
> > might not be suitable for lockscreen which needs to start quickly or
> > splash which shouldn't unnecessarily delay startup.
> > 
> > So, umm, while writing this I figured it's not that good of an idea as I
> > initially thought :-)
> 
> so you suggest that on millions of devices we blur the window fullscreen
> every time the user logs in (lots of more important stuff to do) and locks
> the screen? Compared to preparing it once and just installing it? That
> sounds like a very bad memory-time tradeoff [1].
> 
> Cheers
> Martin
> 
> [1] https://en.wikipedia.org/wiki/Time-memory_tradeoff