On Wed, 4 Sep 2002, Peter Rundberg wrote:
> Hi,
>
> Is there any way to grab a screenshot really fast. I mean like a 1280x1024
> 32bbp screenshot in a couple of milliseconds? I am using XShmGetImage()
> right now, but a screenshot of the size mentioned above takes about 110 to
> 120 milliseconds. Doing the math this gives me a bandwidth of about 40 to
> 45 MB/s. Surely there must be a faster way of doing it.
>
> The system i am sitting on is a Linux box, XFree 4.2.0, nVidia graphics
> (GF2) with the nVidia binary driver.
>
No, there's not a way to copy quickly from the framebuffer.
Reads across AGP are limited to PCI bandwidth. I am seeing over
100 MB/sec in general though (closer to 150 MB/sec on fast P4s).
Mark.
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