On Thu, 19 May 2016 18:10:19 +0100 adlo <adloco...@gmail.com> wrote: > > On 12 May 2016, at 08:57, Pekka Paalanen <ppaala...@gmail.com> wrote: > > > > On Wed, 11 May 2016 23:35:01 +0100 > > ade low <adloco...@gmail.com> wrote: > >> My use case is third-party window switcher applications, such as > >> xfdashboard or my program, xfce4-lightdash-plugin: > >> https://github.com/adlocode/xfce4-lightdash-plugin > > > > The implementation of such things would have so much > > compositor-internal parts anyway, that making a protocol for it does > > not seem tractable to me. Why would anyone bother implementing such > > protocol in their compositor? > > If there is no protocol, what could be an alternative way for > third-party window switchers to be implemented on Wayland compositors?
In general, so that it would work anywhere? None; see Mike's reply. For specific compositors you might be able to implement plugins, or maintain a fork of the compositor project. > >> A little more tractable plan would be to communicate only surface > >>> meta-data to the client, > >>> which could then ask the compositor to draw > >>> the thumbnails relative to one of the client's surfaces. The > >>> client would never have access to window content itself. > >> > > The very point is, the client would not render the thumbnails at > > all. The compositor would. Painting a copy of a window at another > > location should be fairly easy in theory. From your client > > perspective it would be a little like a special sub-surface whose > > content magically just appears on screen. > > If I wanted to try writing something like this as a Weston extension > for testing purposes, how could I get the window's surface? You would design a new protocol extension private to Weston, with which you deliver to your client the handles for top-level windows as they come and go. Then with those handles you could design a protocol for laying out a scaled version of the surface referred to by a handle on top of a wl_surface of your own. You cannot get "the window's surface". You need to invent a new type of handle (a protocol object interface) for referring to windows, and communicate any metadata you may need with it. Thanks, pq
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