[Spice-devel] need help explaining the algorithm

[Victor Toso]

Hi,

On Fri, Nov 09, 2018 at 05:08:21PM +0800, Zihao Miao wrote:
> Hi, list:
> This is my first post to a mail list.. so..

Welcome.

> I am a college student and I am very interested in the
> algorithm that maintains the current ring of drawables to
> reduce the display data transfer.

> I currently read the code through the  trace of
> disolay_channel_process_draw->display_channel_add_drawable->current_add->exclude_region->__exclude_region,

heh, "TODO: What is the intended use of this function?"
https://gitlab.freedesktop.org/spice/spice/blob/master/server/display-channel.c#L764

> and gained some understanding of the code.
> However, I still don't quite get the concept of the difference
> between a draw item and a container?

> And there are questions like why current_add_with_shadow is
> much more complicated than the current_add; what

https://gitlab.freedesktop.org/spice/spice/blob/master/server/display-channel.c#L1424

> did the pip actually send? a drawable or the whole surface?
> where do compression come in?...

So many questions. I'm not really familiar with this code tbh so
I'd have to study myself to reply.

> Do you guys have any resources besides the newbee and spice
> protocol document to learn about this algorithm?

Not really, I trust more the comments and git history.

> Best wishes!
> Zihao Miao

Sorry that I could not help much right now but I hate to see this
kind of email going on not replied for so long. We welcome better
documentation, please do feel free to send patches with your
understanding as documentation. It might trigger the discussions
that you want.

Cheers,
Victor
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