Re: [Xen-devel] Re: Re: [PATCH 2/2] Virtual frame buffer: user space backend

["Christian Limpach" <christian.limpach@xxxxxxxxx>]

On 7/7/06, Anthony Liguori <anthony@xxxxxxxxxxxxx> wrote:
> Since the best we can do is page granularity (for now), why not just have
> a bitmap represent the dirty pages?
Doesn't your virtual framebuffer already support 2d operations?  Also,
the cirrus driver emulation in qemu already supports copyrect.

> Instead of switching bitmaps, why not
> just have the backend and frontend share a bitmap and do atomic get/sets
> on it?
Because we'd like to avoid atomic operations.

> I think the key point is to have the bitmap represent linear regions of
> framebuffer memory instead of logical rectangles within the current
> resolution.
Well, I don't agree ;-)  Because we want to transport 2D redraw
information from the frontend to the backend.

    christian

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