For those of you complaining that taking screenshots was slow... it seems there's not much we can do even with Composite and the latest X server.
-------- Original Message -------- Subject: Re: Fast Screenshot without blocking X events Date: Wed, 17 Oct 2007 09:34:53 +0200 From: Michel Dänzer <[EMAIL PROTECTED]> Organization: Tungsten Graphics To: GORIN Guillaume <[EMAIL PROTECTED]> CC: [EMAIL PROTECTED] References: <[EMAIL PROTECTED]> On Tue, 2007-10-16 at 11:00 +0200, GORIN Guillaume wrote: > > -I don't want that all events on X are waiting in a stack, or something > like this. Actually when capturing (using XGetImage) i can't continue to > move window. It's why I suppose there is a stack of X events, that wait > while capturing. Is it true? (If someone can tell me where to find > informations about that. Xorg Wiki didn't help me). Yes, as the X server is mostly single threaded, event processing is probably delayed while a request such as GetImage is being processed. > I'm able to take screenshot in 3200x1200 in the framebuffer, but it > takes 2.8 seconds. It's too long for me. I suppose there is a stream > from X to the framebuffer, it's why reading is too long. No, CPU reads from video RAM can actually be that slow, especially with AGP. It's possible to accelerate this using the GPU though. > My questions are: > -How X use the framebuffer /dev/fb0 when activated? The nvidia driver doesn't use it at all to the best of my knowledge. > -Can I take screenshot without blocking X events? If XGetImage is inadequate, the only alternative I can think of that might be better is glReadPixels. > -Where can I get the picture of the screen before X send it to my > geforce? (Is it possible?) Probably not, at least not without modifying the driver. Hope this helps, -- Earthling Michel Dänzer | http://tungstengraphics.com Libre software enthusiast | Debian, X and DRI developer _______________________________________________ xorg mailing list [EMAIL PROTECTED] http://lists.freedesktop.org/mailman/listinfo/xorg -- \___/ |___| Bernardo Innocenti - http://www.codewiz.org/ \___\ One Laptop Per Child - http://www.laptop.org/ _______________________________________________ Sugar mailing list [email protected] http://lists.laptop.org/listinfo/sugar
