Re: [compiz] Thumbnail plugin

[Stjepan Glavina]

 Sounds good, lets add it.
 
 Follow the instructions here to get an fdo account:
 
 http://freedesktop.org/wiki/AccountRequests
 
 you can go ahead and add the plugin once you have an account.
 
 - David

Thank you.

Beryl has support for getting thumbnails of windows when they're
unmapped. When a window is unmapped, the pixmap is saved. Look at the
code: http://glug.grm.hia.no/beryl/trunk/beryl-core/src/window.c
(search for 'thumbTexture' and 'thumbPixmap').
Do you have any plans to add support for this in Compiz core too?

Stjepan

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Re: [compiz] Thumbnail plugin

[David Reveman]

On Wed, 2007-01-24 at 10:19 +0100, Stjepan Glavina wrote:
  Sounds good, lets add it.
  
  Follow the instructions here to get an fdo account:
  
  http://freedesktop.org/wiki/AccountRequests
  
  you can go ahead and add the plugin once you have an account.
  
  - David
 
 Thank you.
 
 Beryl has support for getting thumbnails of windows when they're
 unmapped. When a window is unmapped, the pixmap is saved. Look at the
 code: http://glug.grm.hia.no/beryl/trunk/beryl-core/src/window.c
 (search for 'thumbTexture' and 'thumbPixmap').
 Do you have any plans to add support for this in Compiz core too?

I don't know, showing a saved pixmap isn't good enough. You want live
updating thumbnails even for minimized windows and we need input
transformation support to do that properly. So I'd rather wait but it's
your plugin so it's really up to you.

Before you start sending patches to kde and gnome maintainers I suggest
that we discuss the interface that will be provided by the thumbnail
plugin. What does it currently look like?

- David

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Re: [compiz] Thumbnail plugin

[David Reveman]

On Wed, 2007-01-24 at 17:25 +0100, Stjepan Glavina wrote:
 When hovering taskbar, gnome-panel/kicker change the property of the
 appropriate window (_NET_WM_SHOW_THUMBNAIL).
 Thumbnail plugin checks for PropertyNotify events and shows/hides the
 thumbnail.

(I assume that you didn't want take this discussion off the list)

This discussion should eventually be moved to the wm-spec-list but
there's a few things I think we should try to decide here first.

1. Should one window only be allowed to show one thumbnail or should the
property be a list of thumbnails?

2. How is the position and scale of the thumbnail encoded. Is it:

data[0] = thumbnail window ID
data[1] = x
data[2] = y
data[3] = width
data[4] = height

x, y being relative to the client window position.

3. The compositing manager might have to do some work before it can
render the requested thumbnail(s) in a client window. The client
wouldn't want the window which contains thumbnails to be visible until
all thumbnails can be rendered properly. If the client sets the
thumbnail property prior to mapping the window, it allows the
compositing manager to delay any drawing of the client window until the
requested thumbnails can be rendered. Some of this might need to be
documented before it can be accepted as an addition to the EWMH spec.

4. What windows are valid in the thumbnail property? Any window in the
_NET_CLIENT_LIST root window property? Or should there be a new
_NET_THUMBNAIL_LIST property? Such a list means that the compositing
manager doesn't have to provide thumbnails for all available windows,
which makes sense for the current state where thumbnails for minimized
windows can't be rendered.

If someone can think of something else, please jump in.

- David

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