Plasma::Wallpaper does software scaling/copying when it isn't necessary

[velociraptor Genjix]

Ok, Thanks. I will definitely check that out.

peace

> From: zack at kde.org
> To: plasma-devel at kde.org
> Subject: Re: Plasma::Wallpaper does software scaling/copying when it isn't	necessary
> Date: Mon, 12 Jul 2010 15:46:37 -0400
> 
> On Monday 12 July 2010 13:01:33 velociraptor Genjix wrote:
> > > I'm not sure what would that give you. I'm guessing you want to use
> > > something like XvPutImage which wouldn't work because you already
> > > convert the frames to RGB and basically no one accelerates Xv with RGB
> > > surfaces. Besides it would be only meaningful assuming that a) Plasma
> > > currently runs on a system with X11, b) the driver doesn't implement Xv
> > > using an overlay. While we could assume "a" and disable the plugin if
> > > it's not the case, there's no reliable way of testing b and it will
> > > obviously break the entire Plasma (your video will render on top of
> > > everything).
> > 
> > Well any pixel format is possible but we don't want to break plasma. 
> 
> This isn't about format, it's simply that backend scalers render video on top 
> of other contents (hence the name "overlays"), so on canvas such as Plasma 
> they can't be used.
>  
> > > > A video wallpaper should be as natural as an image or colour in today's
> > > > world.
> > > 
> > > That's a bit unrealistic. A static wallpaper needs to be uploaded only
> > > once, while the video will need to be uploaded ~24 times per second (and
> > > given that you're scaling in software even on an avarage laptop that's
> > > 1280*800*4*24 =~ 98MB every second).
> > 
> > But still with all the fancy 3D effects we have turned on... 
> 
> That's a /very/ different thing. The geometry and every individual pixel for 
> those is generated on the GPU. That's not the case for video, video isn't 
> generated on the GPU, it's stored on the disk and has to be uploaded. 
> 
> > > IMHO for video it'd be more interesting to start Plasma with a GL engine
> > > and after decoding the frame (to whatever is the video native YUV
> > > format, e.g. YUV420 for VP8) rendering it as a texture while doing the
> > > to rgb conversion and scale in shaders.
> > 
> > Is it currently possible? Plasma doesn't currently have a GL engine I don't
> > think?
> 
> Just start it with "-graphicsystem opengl" and go from there.
> 
> z
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